Room Air Conditioners
AUTO
°F °C
AUTO
CONTINUOUS
AUTO
SYSTEM
FAN MODE
SCHEDULE
FAN SPEED
Standard Chassis R-410A Models
Cool Only
115-Volt: SS08M10, SS10M10, SS12M10, SS14M10
208-230-Volt:
SS12M30, SS15M30, SM18M30, SM21M30
SM24M30, SL28M30, SL36M30
Cool with Electric Heat
208-230-Volt: ES12M33, ES15M33, EM18M34, EM24M35, EL36M35
Heat Pump with Electric Heat
208-230-Volt: YS12M33, YM18M34, YL24M35
Heat Pump
115-Volt: YS10M10
Kuhl-ServMan (5-10)
IMPORTANT SAFETY INFORMATION
The information contained in this manual is intended for use by a qualified service technician who is familiar
with the safety procedures required for installation and repair, and who is equipped with the proper tools
and test instruments required to service this product.
Installation or repairs made by unqualified persons can result in subjecting the unqualified person making
such repairs as well as the persons being served by the equipment to hazards resulting in injury or
electrical shock which can be serious or even fatal.
Safety warnings have been placed throughout this manual to alert you to potential hazards that may be
encountered. If you install or perform service on equipment, it is your responsibility to read and obey these
warnings to guard against any bodily injury or property damage which may result to you or others.
PERSONAL INJURY OR DEATH HAZARDS
ELECTRICAL HAZARDS:
•
Unplug and/or disconnect all electrical power to the unit before performing inspections,
maintenance, or service.
•
•
•
Make sure to follow proper lockout/tag out procedures.
Always work in the company of a qualified assistant if possible.
Capacitors, even when disconnected from the electrical power source, retain an electrical charge
potential capable of causing electric shock or electrocution.
•
•
Handle, discharge, and test capacitors according to safe, established, standards, and approved
procedures.
Extreme care, proper judgment, and safety procedures must be exercised if it becomes necessary
to test or troubleshoot equipment with the power on to the unit.
2
•
•
Do not spray or pour water on the return air grille, discharge air grille, evaporator coil, control panel,
and sleeve on the room side of the air conditioning unit while cleaning.
Electrical component malfunction caused by water could result in electric shock or other electrically
unsafe conditions when the power is restored and the unit is turned on, even after the exterior is dry.
•
•
•
•
•
•
•
Never operate the A/C unit with wet hands.
Use air conditioner on a single dedicated circuit within the specified amperage rating.
Use on a properly grounded outlet only.
Do not remove ground prong of plug.
Do not cut or modify the power supply cord.
Do not use extension cords with the unit.
Follow all safety precautions and use proper and adequate protective safety aids such as: gloves,
goggles, clothing, adequately insulated tools, and testing equipment etc.
•
Failure to follow proper safety procedures and/or these warnings can result in serious injury or death.
REFRIGERATION SYSTEM REPAIR HAZARDS:
•
•
•
Use approved standard refrigerant recovering procedures and equipment to relieve pressure before
opening system for repair.
Do not allow liquid refrigerant to contact skin. Direct contact with liquid refrigerant can result in minor
to moderate injury.
Be extremely careful when using an oxy-acetylene torch. Direct contact with the torch’s flame or hot
surfaces can cause serious burns.
•
•
•
Make sure to protect personal and surrounding property with fire proof materials.
Have a fire extinguisher at hand while using a torch.
Provide adequate ventilation to vent off toxic fumes, and work with a qualified assistant whenever
possible.
•
•
•
Always use a pressure regulator when using dry nitrogen to test the sealed refrigeration system for
leaks, flushing etc.
Make sure to follow all safety precautions and to use proper protective safety aids such as: gloves,
safety glasses, clothing etc.
Failure to follow proper safety procedures and/or these warnings can result in serious injury or death.
MECHANICAL HAZARDS:
•
Extreme care, proper judgment and all safety procedures must be followed when testing,
troubleshooting, handling, or working around unit with moving and/or rotating parts.
•
Be careful when, handling and working around exposed edges and corners of the sleeve, chassis,
and other unit components especially the sharp fins of the indoor and outdoor coils.
•
•
Use proper and adequate protective aids such as: gloves, clothing, safety glasses etc.
Failure to follow proper safety procedures and/or these warnings can result in serious injury or death.
3
PROPERTY DAMAGE HAZARDS
FIRE DAMAGE HAZARDS:
•
•
•
•
•
•
•
•
Read the Installation/Operation Manual for the air conditioning unit prior to operating.
Use air conditioner on a single dedicated circuit within the specified amperage rating.
Connect to a properly grounded outlet only.
Do not remove ground prong of plug.
Do not cut or modify the power supply cord.
Do not use extension cords with the unit.
Be extremely careful when using acetylene torch and protect surrounding property.
Failure to follow these instructions can result in fire and minor to serious property damage.
WATER DAMAGE HAZARDS:
•
Improper installation, maintenance or servicing of the air conditioner unit can result in water damage
to personal items or property.
•
•
•
Insure that the unit has a sufficient pitch to the outside to allow water to drain from the unit.
Do not drill holes in the bottom of the drain pan or the underside of the unit.
Failure to follow these instructions can result in damage to the unit and/or minor to serious property
damage.
4
INTRODUCTION
This service manual is designed to be used in conjunction with the installation and operation manuals provided with
each air conditioning system.
This service manual was written to assist the professional RAC (Room Air Conditioner) service technician to quickly
and accurately diagnose and repair malfunctions.
This manual will deal with subjects in a general nature.
Accumulator
Outdoor Grille
Discharge Air
Compressor
Fresh Air Vent
Reversing Valve
Evaporator Coil
Condenser Coil
Sleeve
Air Intake Vents
Electronic Control
Board
Control Key Pad
Support Bar
Blower Wheel
Fan Blade
Fan/Blower Motor
Base Pan
Air Intake From
Sides and Bottom
Control Key Pad
(User Interface)
Chassis Pull
Out Handle
IMPORTANT: It will be necessary for you to accurately identify the unit you are servicing, so you can be certain of a
proper diagnosis and repair (See Unit Identification code on page 6).
MODEL AND SERIAL NUMBER LOCATION
Register the air conditioner
Model information can be found on the
name plate behind the front cover.
For your future convenience, record
the model information here.
MODEL NUMBER
MODEL NUMBER VOLTS 115
AIR CONDITIONING CO. YS10M10A 60 HZ PH
SAN ANTONIO, TEXAS SERIAL NUMBER VOLTS MIN 108 EER 12.0
ASSEMBLED IN MEXICO LICY00008 AMPS 8.0
COOLING
HEATING
REFRIGERANT XXXXXXXXX XXXXXXXXXX FUSE PROTECTED
U
/
1
BTH/HR 6500 BTH/HR 6500 30.1 OZ R410A 600 PSIG HS XXXXXXXXX
CIRCUITS USE 15A
300 PSIG LS XXXXXXXXXX TIME DELAY FUSE
XXXXXXXXXX
X
L
XX
XXXXX
XXXXXXXXXX
EER 10.4
AMPS 7.0
SERIAL NUMBER
PURCHASE DATE
MODEL NUMBER
AIR CONDITIONING CO. YS10M10A
SAN ANTONIO, TEXAS SERIAL NUMBER
ASSEMBLED IN MEXICO LICY00008
5
UNIT IDENTIFICATION
Model Number Code
S S 08 M 1 0 A
8th Digit – Engineering
Major change
1st Digit – Function
S = Straight Cool, Value Series
Y = Heat Pump
E = Electric Heat
7th Digit – Options
0 = Straight Cool &
Heat Pump Models
3 = 3 KW Heat Strip, Nominal
4 = 4 KW Heat Strip, Nominal
5 = 5 KW Heat Strip, Nominal
2nd Digit
S = Small Chassis
M = Medium Chassis
L = Large Chassis
6th Digit – Voltage
1 = 115 Volts
3 = 230-208 Volts
3rd and 4th Digit - Approximate
BTU/HR in 1000s (Cooling)
Heating BTU/Hr capacity listed in the
Specification/Performance Data Section
5th Digit
Alphabetical Modifier
RAC Serial Number Identification Guide
Serial Number
Decade Manufactured
A
K
A
R
00001
L=0
A=1
B=2
C=3
D=4
E=5
F=6
G=7
H=8
J=9
Production Run Number
Year Manufactured
Product Line
R = RAC
A=1
B=2
C=3
D=4
E=5
F=6
G=7
H=8
J=9
K=0
Month Manufactured
A=Jan D=Apr G=Jul K=Oct
B=Feb E=May H=Aug L=Nov
C=Mar F=Jun J=Sept M=Dec
6
PERFORMANCE DATA
EVAP. AIR TEMP. DEG.
OPERATING
PRESSURES
R-410A
REF.
BREAKER
FUSE
60 Hertz
Amps
COOLING
PERFORMANCE
DATA*
ELECTRICAL RATINGS
F
CONDENSER Discharge Suction
Sub-
Cooling
Super Heat
Voltage
Temp. TEMP DEG. F
Drop F.
Temp
Temp
Amps
Cool
Amps Locked Rotor Charge in
Discharge Air
Suction Discharge
Heat
Amps
OZ.
SS08M10-A
SS10M10-A
53
52
27
28
115
119
157
150
62
65
12
15
31
28
151
145
400
455
6.1
8.0
32.0
50.0
24.0
51.0
115
115
15
15
SS12M10-A
SS14M10-A
YS10M10-A
50
49
56
30
31
24
118
121
114
163
170
150
60
56
64
12
10
12
23
22
14
137
132
152
435
425
395
10.0
12.0
7.8
57.0
63.0
34.5
35.0
29.0
33.0
115
115
115
15
15
15
7.6
SS12M30-A
ES12M33-A
YS12M33-A
SS15M30-A
ES15M33-A
SM18M30-A
EM18M34-A
YM18M34-A
SM21M30-A
SM24M30-A
EM24M34-A
YL24M34-A
SL28M30-A
SL36M30-A
49
51
49
53
53
54
54
50
48
46
46
56
47
51
31
29
31
27
27
26
26
30
32
34
34
24
33
29
116
115
116
121
121
122
122
118
124
129
129
121
126
129
158
158
167
171
171
160
160
168
170
179
179
176
181
188
62
62
65
62
62
62
62
60
55
55
55
62
58
56
13
13
16
14
14
9
21
18
21
28
28
31
31
24
28
34
34
25
26
31
142
140
140
138
138
145
145
130
137
123
123
135
133
122
405
400
455
430
430
450
450
410
455
495
495
480
430
470
4.8
4.8
5.2
6.4
6.4
7.4
7.4
8.5
9.4
11.0
11.0
11.1
13.5
19.0
30.0
30.0
26.0
32.0
32.0
42.0
42.0
44.0
46.0
47.0
47.0
47.0
60.0
96.0
33.0
33.0
34.5
32.5
32.5
55.0
55.0
49.5
55.0
40.0
40.0
74.0
78.5
77.0
230/208v
230/208v
230/208v
230/208v
230/208v
230/208v
230/208v
230/208v
230/208v
230/208v
230/208v
230/208V
230/208v
230/208v
15
15
15
15
15
15
30
15
15
20
30
30
20
30
16.0
5.1
16.0
9
19.5
8.5
15
10
12
12
18
12
12
12.2
*Rating Conditions: 80 degrees F, room air temp. & 50% relative humidity, with 95 degree F, outside air temp & 40% relative humidity, all
systems use R-410A.
ENERGY STAR® qualified
SPECIFICATIONS
Energy Estimated
Room Side
Air
Efficiency
Ratio
Yearly
Moisture
Net
Weight
Sleeve Lbs
Cooling
Heating
Volts
Cooling
Amps
Cooling
Watts
Heating
Amps
Heating
Watts
Operating Removal Circulation
Model
Capacity Btu Capacity Btu Rated
COP
EER
Cost
Pints/HR
CFM
Kühl
SS08M10
SS10M10
SS12M10
SS14M10
SS12M30
7900
9500
—
—
—
—
—
—
—
—
—
—
—
115
115
115
115
6.1
7.7
677
848
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
11.7
11.2
$54
$68
1.0
2.0
3.0
3.5
2.8
3.5
4.6
6.0
10.0
8.5
12.0
265
260
300
325
275
360
350
425
390
600
725
S
S
S
S
S
S
M
M
M
L
99
106
112
116
112
116
140
132
152
193
212
12000
10.0
12.0
1071
11.2
$86
14000
1444
9.7
$115
$82
11700/11200
230/208 4.8/4.9
1026/982
11.4/11.4
10.3/10.3
10.7/10.7
10.0/10.0
9.4/9.4
9.7/9.6
8.5/8.5
SS15M30 14500/14300
SM18M30 17500/17200
SM21M30 20800/20700
SM24M30 23500/23300
230/208 6.4/6.8 1405/1385
230/208 7.4/8.0 1635/1617
230/208 9.4/10.3 2080/2070
230/208 11.2/11.9 2500/2479
230/208 13.5/14.4 2865/2812
230/208 19.0/20.5 4235/4200
$112
$131
$166
$200
$229
$338
SL28M30
SL36M30
27800/27000
36000/35700
L
Kühl + Heat Pump
YS10M10*
9500
7500
115
7.8
812
7.6
743
3.0
11.7
$65
$89
$147
†
1.9
3.0
5.4
7.0
285
265
370
600
S
S
M
L
109
115
141
197
YS12M33 12100/12100 9400/9000 230/208 5.2/5.4 1120/1120
YM18M34 18200/17800 15500/15400 230/208 8.5/8.9 1838/1798
5.6/5.8
1132/1139 2.4 10.8/10.8
8.5/8.7 1833/1761 2.6
9.9/9.9
9.7/9.7
YL24M35
24000/23600 23500/23200 230/208 11.1/12.0 2474/2433 12.2/14.3 2610/2575 2.6
Kühl + Electric Heat
ES12M33
11700/11200 10700/8900 230/208 4.8/4.9
1026/982 16.0/14.7 3500/2900 3.3 11.4/11.4
$82
2.8
3.5
275
360
350
390
725
S
S
M
M
L
113
117
141
153
213
ES15M33 14500/14300 10700/8900 230/208 6.4/6.8 1405/1385 16.0/14.7 3500/2900 3.0 10.3/10.3
EM18M34 17500/17200 13000/10600 230/208 7.4/8.0 1635/1617 19.5/17.0 4200/3500 3.1 10.7/10.7
$112
$131
$200
$338
4.6
EM24M34 23500/23300 13000/10600 230/208 11.2/11.9 2500/2479 19.5/17.0 4200/3500 3.1
EL36M35 36000/35700 17300/14300 230/208 19.0/20.5 4235/4200 24.0/22.4 5500/4650 2.5
9.4/9.4
8.5/8.5
10.0
12.0
R-410A
* Operates on 115 volt and is not equipped with supplemental heat. Will not provide heat at temperatures below 40°F.
Friedrich room air conditioners are designed to operate in outdoor temperatures from 60° F to 115°F.
Due to continuing research in new energy-saving technology, specifications are subject to change without notice.
As an ENERGY STAR® partner, Friedrich Air Conditioning Co. has determined that the selected ENERGY STAR® () models meet the ENERGY
STAR® guidelines for energy efficiency.
All models use
environmentally
friendly R-410A
refrigerant.
The consumer- through the AHAM Room Air Conditioner Certification Program- can be certain that the AHAM Certification Seal accurately states
the unit’s cooling and heating capacity rating, the amperes and the energy efficiency ratio.
Estimated yearly operating cost based on a 2007 national average electricity cost of 10.65 cents per kWh.
† The estimated yearly operating cost of this model was not available at the time the range was published.
7
Installation Information / Sleeve Dimensions
Thru-the-wall Installation
Finished Hole
Depth Shell Depth to
Window Width
Minimum
Extension
Into Room*
Minimum
Extension
Outside*
16 15/16”
16 15/16”
18 15/16”
with Front
Louvers
Sleeve
Height
15 15/16"
17 15/16"
20 3/16"
Width
25 15/16"
25 15/16"
28"
Minimum** Maximum Height
Width
26 3/16”
26 3/16”
28 ¼"
Max. Depth
7 3/8"
S
M
L
29"
29"
27 3/8"
27 3/8"
29 7/8”
42"
42"
42"
16 3/16”
18 3/16”
20 3/8"
8
8
¾"
¾"
5
5
¾”
7 3/8”
¾”
35 ½”
5 3/8”
15 1/8”
16 ½"
* Minimum extensions when mounted in a window.
** Minimum widths achieved using one side curtain assembly as opposed to both in a standard installation.
NOTE: S,M and L sleeves may be installed in window with no side kits if properly installed.
Circuit Rating/ Breaker
Circuit Rating
Breaker or
T-D Fuse
Wall Outlet
Plug Face Power Cord
(NEMA#) Length (ft.)
Model
Appearance
SS08M10, SS10M10, SS12M10 and
SS14M10. YS10M10.
125V - 15A
250V - 15A
5 - 15P
6 - 15P
6
4
Front
SS12M30, SS15M30, SM18M30 and
SM21M30.
SIDE VIEW
(
SM24M30, SL28M30. ES12M33,
ES15M33. YS12M33
250V - 20A
250V - 30A
6 - 20P
6 - 30P
4
4
SL36M30. EM18M34, EM24M34,
EL36M35. YM18M34 and YL24M35
For the best cooling performance and highest energy efficiency
Keep the filter clean
Insulation
Make sure that your air conditioner is always in top performing condition
by cleaning the filter regularly.
Good insulation will be a big help in maintaining desirable comfort levels.
Doors should have weather stripping. Be sure to caulk around doors and
windows.
Provide good air flow
Make sure the airflow to and from the unit is clear. Your air conditioner puts the
conditioned air out at the top of the unit, and takes in unconditioned air at the
bottom. Airflow is critical to good operation. It is just as important on the outside
of the building that the airflow around the unit exterior is not blocked.
Proper installation of seal gasket
Make sure the seal gasket has been installed properly to minimize noise
and improve efficiency. If the seal gasket has not been installed, please
refer to the installation instructions.
Unit placement
If your air conditioner can be placed in a window or wall that is shaded by a tree
or another building, the unit will operate even more efficiently. Using drapes or
blinds on the sunny side of the dwelling will also add to your unit’s efficiency.
8
ELECTRICAL DATA
WARNING
ELECTRIC SHOCK HAZARD
Turn off electric power before service or
installation.
All electrical connections and wiring MUST be
installed by a qualified electrician and conform to
the National Electrical Code and all local codes
which have jurisdiction.
Failure to do so can result in personal injury or
death.
NOTICE
FIRE HAZARD
Not following the above WARNING could result in fire or
electically unsafe conditions which could cause moderate
or serious property damage.
Read, understand and follow the above warning.
Wire Size
Use ONLY wiring size recommended for single outlet branch circuit.
Fuse/Circuit Breaker
Use ONLY the correct HACR type and size fuse/circuit breaker. Read electrical ratings on unit’s
rating plate. Proper circuit protection is the responsibiity of the homeowner.
Grounding
Receptacle
Unit MUST be grounded from branch circuit through service cord to unit, or through separate
ground wire provided on permanently connected units. Be sure that branch circuit or general
purpose outlet is grounded.
The field supplied outlet must match plug on service cord and be within reach of service cord.
Do NOT alter the service cord or plug. Do NOT use an extension cord. Refer to the table above
for proper receptacle and fuse type.
The consumer - through the AHAM Room Air Conditioner Certification Program - can
be certain that the AHAM Certification Seal accurately states the unit’s cooling and
heating capacity rating, the amperes and the energy efficiency ratio.
*HACR: Heating Air Conditioning and Refrigeration
9
WARNING: Before Operating Your Unit
WARNING
NOTICE
Do not use the LCDI device as an ON/OFF switch.
Electrical Shock Hazard
Make sure your electrical receptacle has the
same configuration as your air conditioner’s
plug. If different, consult a Licensed Electrician.
Failure to adhere to this precaution may cause
premature equipment malfunction.
Do not use plug adapters.
Do not use an extension cord.
Do not remove ground prong.
Once plugged in, the unit will operate normally without the need to reset
the LCDI device. If the LCDI device fails to trip when tested or if the power
supply cord is damaged, it must be replaced with a new power supply cord
from the manufacturer. Contact our Technical Assistance Line at (800)
541-6645. To expedite service, please have your model number available.
Always plug into a grounded 3 prong oulet.
Failure to follow these instructions can result in
death, fire, or electrical shock.
Make sure the wiring is adequate for your unit.
Table 1.
If you have fuses, they should be of the time delay type. Before you install
or relocate this unit, be sure that the amperage rating of the circuit breaker
or time delay fuse does not exceed the amp rating listed in Table 1.
CIRCUIT RATING
OR TIME DELAY
FUSE
REQUIRED
WALL
RECEPTACLE
MODEL
NEMA
NO.
AMP
VOLT
DO NOT use an extension cord.
The cord provided will carry the proper amount of electrical power to the
unit; an extension cord may not.
SS08M10, SS10M10,
SS12M10, SS14M10,
YS10M10
15
125
5-15R
6-15R
6-20R
Make sure that the receptacle is compatible with
the air conditioner cord plug provided.
SS12M30, SS15M30,
SM18M30, SM21M30
15
20
250
250
SL25M30, SL28M30,
ES12M33, ES15M33,
YS12M33
Proper grounding must be maintained at all times. Two prong receptacles
The grounded receptacle should meet all national and local codes and
ordinances. You must use the three prong plug furnished with the air
conditioner. Under no circumstances should you remove the ground
prong from the plug.
SL36M30, EM18M34,
EL25M35, EL36M35,
YM18M34, YL24M35
30
250
6-30R
Test the power cord
Figure 1
All Friedrich room air conditioners are shipped from the factory with a
Leakage Current Detection Interrupter (LCDI) equipped power cord. The
LCDI device on the end of the cord meets the UL and NEC requirements
for cord connected air conditioners.
TEST
RESET
TEST
RESET
To test your power supply cord:
WARNING
TEST BEFORE EACH USE
1. PRESS RESET BUTTON
1. Plug power supply cord into a grounded 3 prong outlet.
2. PLUG LCDI INTO POWER
RECEPTACLE
3. PRESS TEST BUTTON,
RESET BUTTON SHOULD
POP UP
WARNING
TEST BEFORE EACH USE
1. PRESS RESET BUTTON
2. PLUG LCDI INTO POWER
RECEPTACLE
3. PRESS TEST BUTTON,
RESET BUTTON SHOULD
POP UP
2. Press RESET (See Figure 1).
4. PRESS TEST BUTTON,
FOR USE
DO NOT USE IF ABOVE TEST
FAILS
3. Press TEST, listen for click; the RESET button trips and pops out.
4. PRESS TEST BUTTON,
FOR USE
DO NOT USE IF ABOVE TEST
FAILS
WHEN GREEN LIGHT IS ON
IT IS WORKING PROPERLY
4. Press and release RESET (Listen for click; RESET button latches
WHEN GREEN LIGHT IS ON
IT IS WORKING PROPERLY
and remains in). The power cord is ready for use.
15/20A LCDI Device
30A LCDI Device
FRR001
10
FAN SPEED Button – Used to sequentially select between fan speeds.
Depending on your model, you can select between LOW, MED, HIGH,
and MAX and AUTO. Max setting not available on SL and Kuhl+ models.
Control Panel Operation
Let’s check out how to control your air conditioner. On the control panel,
just to the left of the POWER , is a liquid crystal display (LCD). All of the
control panel function buttons and mode icons can be viewed in Figure 1.
When the
in the display window, plus a fan speed icon (triangle) changes to indicate
the new speed level. W fan speed automatically varies
button is pressed, the fan speed is temporarily displayed
hen auto is selected,
Power On – Press the
button to turn on the air conditioner. The
depending on the set temperature on the control panel and the actual
room temperature. Let me explain. Say for example you’re working in
your garage and you need to open the big door for several minutes. The
air conditioner will sense a wide difference between the set temperature
and the actual room temperature when this occurs the system fan speed
increases to MAX. The fan speed decreases (in step) as the temperature
difference decreases. When the set point temperature is reached the FAN
speed returns to the original setting.
power button will illuminate to indicate the power is on. The backlight on
the power switch will automatically dim to 20% intensity after 120 seconds
of inactivity. The remote control can also be used to turn power ON / OFF
(See Remote Control).
Display –
light. The back light has an automatic two (2) step dim function. After 120
seconds of inactivity, the display dims to 20% intensity. After an additional
120 seconds, the display switches off. Touching buttons will automatically
bring the display to full brightness.
SCHEDULE Button – The
and off. The current day of the week is indicated as a dot underneath
the day symbol. Pressing the button a second time turns the
button turns the schedule function on
There are four control push buttons on each side of the display.
schedule function off. The schedule function comes preprogrammed with
recommended energy savings values (Addendum 1). The values may
be changed through the schedule program function (See Programmable
Thermostat).
SYSTEM Button – Allows the user to sequentially select,
, HEAT , and FAN ONLY operation. Press the
the display advances to the next mode. A new icon appears. At the same
time, the mode displays for two (2) seconds, then returns the display to
the temperature set point for modes other than FAN. Note that on cool
Cool
button and
UP and DOWN arrows – Pressing either
(UP) or
(DOWN) button
only units, there are no HEAT and
modes.
changes the desired room temperature. The factory preset lower and
upper limits are 63° F (16° C) and 99° F (37° C). These buttons are also
used to navigate between function options when using the User Menu or
Maintenance Mode.
FAN MODE Button – Selects between automatic
operation. In the mode, the fan only turns on and off when the
compressor operates or the heat function is enabled.
or
BACK Button – This button is used after a menu item has been selected.
It takes the user back to the previous menu level and to save and exit.
In the SYSTEM FAN ONLY Mode,
is not available. In the
mode, fans speed is determined by your selection on the
button.
DISPLAY/ENTER Button – This button is used in conjunction with User
Menu and Maintenance Mode operation to select items. This button may
also be used to alternatively display the ROOM TEMPERATURE,
OUTDOOR TEMPERATURE, and TIME. If the display is left inactive for
10 seconds it will reset to the TEMPERATURE SET POINT.
Figure 1
FRONT
PANE L
LOCK
FAN
ONLY
MODE MODE
MAINTENANCE
REQUIRED
AUTO
MODE
COOL
MODE
HEAT
FILTER
MAINTENANCE WAIT
BACK
CHECK
FI LTER OFF RESET
ON EXIT
SYSTEM
AUTO
OUTDOOR TEMP
ROOM TEMP
FAN
MODE
AUTO
HE AT -> SET POINT <- COOL
CONTINUOUS
F
A
M
AUTO
FAN
P
M
SPEED
C
M T
W
T
F
S
S
POWER
WAKE
AWAY
R E TURN NIGHT
DISPLAY
ENTER
SCHEDULE
BUTTONS SCHEDULE
ON/OFF
SCHEDULE
PERIODS
BUTTONS
11
ALERTS (The control system has five (5) customer alerts)
CHECK FILTER
appears on screen. The word “
” appears next to the
button.
The alert is issued when the fan run time is greater than 500 hours.
This alert may be reset by the user (Refer to Special Functions, Filter Reset).
Maintenance Required – When maintenance is required, a service icon
appears on screen. This icon will not be dismissed until maintenance
has been performed. If the service icon
The hour digits flash first. The user presses the
to change the hours. To change AM-PM, the hours must be
advanced 12 hours. Press the key to change to the
minutes. To exit the selection process, user presses the
key which will go to the time screen.
or
the icon
is on standby the system has sensed an abnormal condition.
goes away.
is established the service icon
Wait – The WAIT icon illuminates when the compressor lockout is active.
Whenever the compressor shuts off, system pressures must be allowed
to equalize. At this time, an internal timer begins a count-down from up to
240 seconds. If a demand for heat or cool occurs during this count-down
The minutes digits flash. The user presses the
or
to change the minutes. Press the key to change the days.
the WAIT icon
displays letting you know that the compressor will not
To exit the selection process, the user presses the
which will go to the time screen.
key
operate until the count-down has completed. This timer prevents damage
to the unit if it tries to start too quickly after it stops running. Normally the
WAIT icon
is off. Once the timer has cleared, the air conditioner will
heat or cool based on the temperature setting. Electric heat is not affected
by this timer.
The dot underneath the days of the week begins to blink to
indicate which day it is. If the user has not set the date before,
the dot starts on Monday. If the user is making a correction to
previously set information the dot appears under whichever
Protection Alert (Freeze) – If the room freeze protection is active, the
display indicates this by showing Room Freeze Protection "FRZ". Once
day the unit thinks it is. The user can press
the dot left or right (respectively) along the week. The user
presses to loop back to the hours setting. To exit the
or
to move
temperature is less than 40° F (4° C), and the air conditioner is equipped with
electric heat, the room freeze protection will activate. The air conditioner
will run high fan and electric heat until the room temperature reaches
selection process, the user presses the
to the time screen.
key which will go
46° F (8° C). Pressing the
button delays the freeze protection function
Low Battery – When the battery is low a warning display
will be
Tuesday has been selected. The user presses
back to the hours setting. To exit the selection process and
to loop
inserted before other messages such as “COOL”. If the Low Battery
alert is on, the battery in the control unit must be changed. Refer
to the changing the battery procedure. Once the battery is changed, the
alert message will go off. Refer to Troubleshooting Tips. Under normal
conditions the battery life should be greater than 7 years.
BACK
accept the changes, the user presses the
to the time screen.
key which will go
Special Functions
Time Setting – When in the User Menu, on the Control Panel, use the
Panel Lock
– The front panel push buttons can be locked to prevent
(UP) and
(DOWN) to select TIME. Push
, the hours segment
SCHEDULE
inadvertent operation. To lock the front panel, press and hold the
+
(UP) and (DOWN) to set the hour, then push
buttons for three (3) seconds. A double beep indicates your mode
change was successful and a
the display, press and hold the
(UP) and
(DOWN)
icon appears on the display. To unlock
buttons for three (3) seconds.
to set the minutes, then push
.
SCHEDULE
+
NOTE: If the AM or PM indicator is incorrect, push
until the hours
(DOWN) to advance
. The day of the week
The
icon will no longer be visible.
(UP) or
Filter Reset –
and holding the
icon displays, the timer may be reset by pressing
button for three (3) seconds. A beep indicates the
the hour segment 12 hours, then push
displays. Use the
day. Press the
(UP) or
(DOWN) to select the current
system timer was reset and the
no longer be visible.
icon and the word " RESE T " will
key to save and go back to the TIME screen.
Press
(UP) to go to the next menu 1224.
User Menu Functions – The User Menu Functions allows you to change
the following selections: Set TIME, 12/24 Hour Clock Format, BEEP ON /
OFF, DIM ON / OFF, Emergency Heat (EMHT) ON / OFF, Auto BAND Adjust,
F/ C Select, FRZ ON / OFF, Temp Offset (TO) and the Automatic Temperature
Sensing Feature (ATSF).
NOTE: Pressing the
button again will exit the user menu function
mode. Or simply leave the control inactive for 15 minutes and
the control will return back to normal operation.
To enter the User Menu, press and hold
selection appears. Use the (UP) or
through the User Menu. Press the
for 3 seconds, the TIME
(DOWN) buttons to scroll
button to enter the displayed
function. If left inactive for 15 minutes the User Menu display will no longer
be visible and it returns to normal operation mode display. To manually
exit the User Menu, press the
button.
12
BACK
EXIT
BACK
SYSTEM
EXIT
SYSTEM
FAN
MODE
FAN
MODE
FAN
SPEED
FAN
SPEED
DISPLAY
ENTER
DISPLAY
ENTER
SCHEDULE
SCHEDULE
User presses
and Emergency Heat Off. Press the
change and exit the selection process.
or
to toggle between Emergency Heat On
User presses
24HR display. To exit the selection process and accept the
change, press the key.
or
to toggle the format between 12HR and
key to accept the
Emergency Heat – The Kühl+ heat pump models (YS, YM, YL) have
a special feature that is designed to keep the unit providing heat.
Clock Type – You may select between a 12 hr and 24 hr clock. When
1224 is displayed press the key then press (UP) or (DOWN)
to toggle between 12 hr and 24 hr clock. To accept the change, press the
key to return to the 1224 screen. Press the (UP) to go to the
next menu BEEP.
key then press
(UP) or
When EMHT is displayed press the
(DOWN) to toggle between ON and OFF.
To accept the change, press the
key to return to the EMHT screen.
Press the (UP) to go to the next menu BAND.
In the unlikely event of a compressor failure, the heat pump unit may be
switched to operate in the electric heat mode only until repairs can be
made.
BACK
EXIT
SYSTEM
FAN
MODE
FAN
SPEED
BACK
EXIT
SYSTEM
DISPLAY
ENTER
SCHEDULE
FAN
MODE
FAN
SPEED
User presses
Off. Press the
selection process.
or
to toggle between Beep On and Beep
key to accept the change and exit the
DISPLAY
ENTER
SCHEDULE
The menu allows the user to adjust the minimum spread
between the Auto Cool set point and the Auto Heat set point.
Press the
or
key to adjust. The adjust range is 3 to 10.
Audible Alerts – You can select to have the control beep when entering
When BEEP is displayed press the
key then press
(DOWN) to toggle between ON and OFF. To accept the change,
key to return to the BEEP screen. Press the (UP) to go
(UP)
menus.
or
press the
Auto Changeover ‘Dead Band’ – A buffer Zone between heating and
cooling in which no conditioning occurs. For Kühl+ models with the auto
changeover feature you can select the temperature band between heating
and cooling. From the factory the band is set at 3° F (-16° C). The band is
adjustable from 3° F (-16° C) to 10° F (-12° C). When BAND is displayed
to the next menu EMHT on Kühl+ models or F C for Kühl models.
press the
3 and 10. To accept the change, press the
screen. Press the
key then press
(UP) or
(DOWN) to toggle between
key to return to the BAND
(UP) to go to the next menu F C.
FAN
SPEED
DISPLAY
SCHEDULE
ENTER
BACK
EXIT
SYSTEM
FAN
MODE
User presses
Press the
or
to select between AUTO, DM 20, OFF.
key to accept the change and exit the
FAN
SPEED
selection process.
DISPLAY
ENTER
SCHEDULE
The Dim Auto automatically dims the display to 20% and then
turns it off after a period of time. The Dim 20 setting behavior
is similar to AUTO, but prevents the display from turning off.
Minimum brightness is 20%. The Dim Off setting forces the
display to run at full brightness.
User presses
or
at the same time to toggle between
Fahrenheit or Celsius as their temperature unit of choice.
Press the
process.
key to accept the change and exit the selection
Fahrenheit / Celsius Selection – You may select between displaying
temperature in F or C. When F C is displayed press the key then
press
change, press the
(UP) or
(DOWN) to toggle between F and C. To accept the
key to return to the F C screen. Press the
(UP) to go to the next menu FRZ.
13
BACK
EXIT
SYSTEM
FAN
MODE
FAN
SPEED
DISPLAY
ENTER
SCHEDULE
User presses
Press the
or
to select between ATSF On or Off.
key to accept the change and exit the
selection process.
User presses
or
to select between Freeze Protection On
& Freeze Protection Off. Press the
key to accept the
change and exit the selection process.
Freeze Protection – The Kühl+ models have a special feature that is
designed to keep the interior space above freezing by energizing the
electric heater anytime the indoor room temperature falls to 40° F (4° C).
With the freeze protection feature turned on, when the unit senses the
indoor temperature fall to 40° F (4° C) the unit will run the heater and high
fan until the space reaches 46° F (8° C) When FRZ is displayed press
the
and OFF. To accept the change, press the
screen. Press the
key then press
(UP) or
(DOWN) to toggle between ON
key to return to the FRZ
Automatic Temperature Sampling Feature - The automatic temperature
sampling feature maintains a balanced temperature throughout the room
by circulating the air for 30 seconds once every 9 minutes that the unit is
not running when it is set to cooling or heating mode. By circulating the air
the unit can detect hot or cold areas in the room and operate the unit to
cool or warm the room as necessary. This function is only available when
the fan mode is set to ‘AUTO’ or in COOL or HEAT Mode. (Heating function
only available on Kuhl+ units)
(UP) to go to the next menu TO.
BACK
EXIT
SYSTEM
FAN
MODE
FAN
SPEED
DISPLAY
ENTER
SCHEDULE
User presses
or
to increment/decrement the temperature
offset (TO) for the room temperature sensor. (Maximum offset
= +/- 8 degrees F). Press the
and exit the selection process
key to accept the change
Y
For display only. No user selectable options.
Temperature Offset – In some cases the built in thermostat on the unit
may not display the temperature as it is felt in the room. This can be caused
by many things including the size of the unit, the heat load on the room or
other factors. Friedrich allows you to select the appropriate temperature
offset to make the temperature readout as accurate as possible for your
application. In many cases the factory 0° F (-18° C) offset will provide
an accurate temperature readout. To change the offset follow these
F
instructions. When TO is displayed press the
(UP) or (DOWN) to toggle between 0° F (-18° C) and 8° F (-13° C).
In most instances an offset from 0° F (-18° C) to 2° F (-17° C) is all that is
necessary. To accept the change, press the key to return to the TO
(UP) to go to the next menu ATSF.
key then press
Firmware Version - When VER is displayed press Display /
Enter key. The firmware version is displayed as left digit
(Major) and right digit (Minor). This version number should be
used along with Model and Serial numbers for service.
screen. Press the
You may cycle through the menus using the
to access any of the menus.
(UP) or
(DOWN) keys
DIGITAL CONTROL PANEL'S ACCESS CODES SUMMARY
Key Sequence
Filter Reset
Action
Press BACK key for 3 sec+ play double beep (ꢀ)
Enter User Menu
Enter Maintenance Menu
Schedule ON/OFF
PressDISPLAY/ENTER key for 3 sec+ play double beep (ꢀ)
Press SYSTEM + SCHEDULE + BACK + DISPLAY/ ENTER for 3 sec+ play double beep (ꢀ)
Press SCHEDULE once each time
Enter & Exit Schedule Programming Press SCHEDULE for 3 sec+ play double beep (ꢀ)
Reset Error Codes & Error History
Lock Control Panel
Press
+
ꢁ
for 3 sec+ play double beep (ꢀ)
ꢀ
Press SCHEDULE + DISPLAY/ENTER for 3 sec + play double beep (ꢀ)
14
FAN SPEED Button – Used to sequentially select new fan speed, plus
Remote Control Operation
FA N
SPEED
AUTO operation. When the
button is pressed, the fan speed is
Remote Control – Refer to Figures 11 and 12 during operation description.
temporarily displayed in the display window, plus a fan speed icon (triangle)
changes to indicate the new speed level. Fan speed automatically varies
depending on the set temperature on the control panel and the actual
room temperature. Let me explain. Say for example you’re working in
your garage and you need to open the big door for several minutes. Since
there is a big difference between your set temperature and the actual room
temperature the system fan speed increases to MAX. It remains at this
speed until the room temperature matches the set temperature.
Getting Started – Install two (2) AAA batteries in the battery compartment
located on the back of the unit.
Operation – The remote control should be within 25 feet of the air
conditioner for operation (Refer to Figure 10 for effectiveness). Press the
button to turn the remote on. The remote will automatically power off
after 15 seconds if the buttons are not being pressed. The remote must
be on to control the unit.
SCHEDULE
– The
SCHEDULE Button
off. Pressing the
button turns the schedule function on and
button a second time turns the schedule function
SCHEDULE
POWER Button – Turns remote and unit on and off.
off. Only the schedule icon will be displayed.
SYSTEM Button – Allows the user to sequentially select,
Cool
,
HEAT , and FAN ONLY operation. When the button is pressed, the
display indicates which mode has been selected via a display message.
Note that when the heating function is not available, the system will
automatically skip the HEAT and AUTO modes.
UP and DOWN Arrows – Pressing either the
(UP) or
(DOWN)
button changes the desired room temperature. The factory preset lower
and upper limits are 60° F (16° C) and 99° F (37° C). These buttons are
also used to navigate between function options when using the User Menu
or Maintenance Mode.
FAN MODE Button – Selects between automatic (
) or
operation. In the AUTO mode, the fan only turns on and off when the
compressor operates or the heat function is enabled.
Remote Effectiveness
Hand Held Remote – Has an operating range of up to 25 ft. The infrared
remote control signal must have a clear path to transmit the command to
the air conditioning unit. The remote signal has some ability to "bounce"
off of walls and furniture similar to a television remote control. The diagram
below shows the typical operating range of the control in a standard room
with 8 ft high ceilings.
NOTE: AUTO is not available in the FAN ONLY Mode, the display
indicates
. In the
mode, fan speed is
button.
determined by your selection on the
TOP VIEW
25ft
25ft
7.5ft
SIDE VIEW
4ft
60°
60°
6ft
30°
45°
60°
60°
45°
45°
8ft
25ft
30°
30°
45°
30°
16ft
8ft
25ft
25ft
25ft
25ft
25ft
Changing Temperature from F˚ (Fahrenheit) To C˚ (Celsius) or Reverse
Be within 25' of unit with the remote control. Press the SYSTEM and FAN MODE buttons at the same time and hold for 3
seconds. The display will show the temperature in Celcius. Do the same to reverse temperature to F˚ (Fahrenheit).
15
Remote Control Operation (Continued)
DISPLAY
SYSTEM
FAN MODE
POWER
TEMPERATURE
UP
TEMPERATURE
DOWN
FAN SPEED
SCHEDULE
AUTO
ICON
COOL
ICON
HEAT
ICON
FAN ONLY
ICON
SYSTEM
MODE
°F / °C
ICONs
FAN
MODE
FAN
SPEED
SCHEDULE
ICON
2 X 16 SEGMENT
DISPLAY
16
ELECTRONIC CONTROL SYSTEM MAINTENANCE
Introduction
This section contains information on the maintenance alerts, temperature limiting, diagnostic test and how to access. The electronic
control system has a built in maintenance sub system which works constantly behind the scenes to help identify problems with the air
conditioner or control system. When maintenance is required, a service icon appeasrs on the display screen.
This icon
will not be dismissed until maintenance has been performed or the problem cleared.
Note: The wrench icon may be on steady or flash, depending on severity. Maintenance should only be performed by qualified service
personell.
Display
Testing the Display
Press the FAN MODE and FAN SPEED buttons at the same time for 3 seconds. All of the display's icons and functions
should light up. If any of them do not light up, the display should be replaced. When the buttons are released, the display
reverts to the original display.
17
Electronic Control System Maintenance Operation
To Enter the Maintenance Section:
Press SYSTEM+SCHEDULE+BACK+DISPLAY/ENTER for 6 seconds.
There are 5 maintenance sub-menus M1 through M5.
Access
Maintenance Sub-Menus
M1
M2
M3
Service Only
Service Only
Service Only
– Temperature High Limit
– Temperature Low Limit
– Test Mode Access
M4 – Provision Switch Setting & State
M5 – Alarms & History
Factory Use Only
Service Only
M6
–
Factory Use Only
Factory Use Only
Pressing the ▼or ▲key cycles through the sub-menus. Press DISPLAY/ENTER to
enter a sub-menu. The BACK key is used to exit the menu. Extreme care must
be taken when modifying parameters in the maintenance menus.
18
Temperature High Limit
Maintenance function 1 is ready to be selected. Press DISPLAY/ENTER to access
the function.
User presses
ꢀ
or
ꢁ
to increment or decrement the upper temperature limit. 99°F
is the maximum upper limit. The current stored high limit is displayed when the
screen is selected. Press the BACK key to accept the value, and exit the sub-menu
to the M1 screen.
Temperature Low Limit
Maintenance funtion 2 is ready to be selected. Press DISPLAY/ENTER to access
the fuction
User presses
ꢀ
or
ꢁ
to increment or decrement the lower temperature limit. 60°F is the
minimum lower limit. The current stored lower limit must be displayed when the screen
is selected. Press the BACK key to accept the value, and exit the sub-menu to the M2
screen.
M3 – Test Mode Access
Maintenance function 3 is ready to be selected. Press
DISPLAY/ENTER to access the function.
User presses the ▼or ▲key to toggle the Test Mode
ON/OFF. Press the BACK key to accept the change
and exit the sub-menu to the M3 screen.
This test selects the system mode of operation directly.
The Following functions Can be Tested
1. System Mode: Cool/Heat Pump Compressor, Electric Heat, Fan Only
2. Fan operation and speeds
Test mode Bypasses:
1. Compressor lock out (time delay)
2. All relay switch’s delays
3. All thermistors delay
4. Automatic heat/cool changeover delay
5. System settings
If M3 switch is left ON it will reset to OFF automatcally after 15 minutes of inactivity.
19
M4 – Switch Access (Unit Configuration)
FACTORY USE ONLY
Error Code
On/Off
M5 – Error Codes & History
Number of Errors
Error Code
Maintenance funtion 5 is ready to be selected. Press DISPLAY/ENTER to access the function.
The error code display shows the error code number on the left, and the error code
history on the right. User presses the
ꢀ
or
ꢁ
keys to cycle through the error codes.
The current state of the error code is shown with the On/Off icon. To exit the
maintenance sub-menu, press the BACK key to return to the M5 screen.
Shown on this display is error code 1 with 4 occurances. The current state is on.The
error code display shows the error code number on the left, and the error code history
on the right. User presses the
ꢀ
or
ꢁ
keys to cycle through the error codes. The
current state of the error code is shown with the On/Off icon. To exit to the
maintenance sub-menu, press the BACK key to return to the M5 screen. Shown on
this display is error code 6 with 3 occurances. The current state is off.
To Clear Error Codes’ History:
Hold the
ꢀ
or
ꢁ
keys simultaneously for 3 seconds. See page 56 for alarm status and error codes.
M6 – Factory Use Only
20
UNIT OPERATION
There are two basic ways to operate the unit - Front Panel and Wallstat. The Front Panel and Wallstat are never active at the
same time. Switching between these modes is controlled via the (FP) jumper on the Wallstat connector. When the jumper is
ON, the mode = Front Panel.
Front Panel
System Mode Sequence (SCHEDULE = OFF)
There are two system modes of operation. One for a cool only unit (see figure 1) and one for a heat-cool unit (see figure 2).
System parameters for each system mode are saved when exiting a system mode, and retrieved when entering a new
system mode.
Figure 1
System Mode: Cool Only Units
Figure 2
System Mode: Heat - Cool Units
21
COOL-HEAT SET POINTS
The air conditioner control system is designed to control different product configurations
with a select set of features. Some models just cool, some cool and heat with electric
heat, and others cool and heat with a heat pump and/or electric heat.
The system set points are mapped to the internal controls as shown below.
Control
1.5
1.5
Deadband
System Set Point Mapping Figure
There are 8 stored & variable set points in the system:
1 - ASPC: Auto Set Point Cool
2 - ASPH: Auto Set Point Heat
3 - CSP: Cool Only Set Point
4 - HSP: Heat Only Set Point
5 - SASPC: Scheduler Auto Set Point Cool
6 - SASPH: Scheduler Auto Set Point Heat
7 - SSPC: Scheduler Set Point Cool Only
8 - SSPH: Scheduler Set Point Heat Only
22
ELECTRONIC CONTROL SEQUENCE OF OPERATION
Compressor and Reversing Valve Control
Active Mode
Compressor
Reversing Valve State
De-Energized
Energized
Cooling
On
On
Off
Off
Heat - Heat Pump
Heat - Electric
Fan Only
* The Reversing valve stays in the last state until a call for heat or cooling (see figure below)
Compressor Operation:
The reversing valve only changes when required
to provide cooling or heat pump. The RV valve
stays in it's last state until required to change.
Cooling Mode
Once the ambient temperature rises past the cool demand threshold (Cool Set Point + 1.5 ˚F) (see figure below), and
the compressor is not locked out, the cooling cycle begins. As shown in the figure below, the fan is started 5 seconds
prior to the compressor. Once the ambient temperature has been lowered to the cool set point (Cool Set Point minus
.25 ˚F), the cooling cycle starts to terminate by shutting off the compressor. After a 30 seconds delay, the fan is shut
off. (See figure below for graphic details)
23
Heating Mode Control Operation
There are two heating methods: Heat Pump and Electric Resistance Heat.
There are 3 types of units that provide heating: Heat Pump Only (Model YS10M10)
Heat Pump with Electric Heat and Cool with Electric Heat.
Heat Control Operation Heat Pump Only
Once the ambient temperature falls below the Heating Demand Threshold
(1.5 ˚F Below the Heat Set Point Temperature), the heating cycle begins. The fan is turned on 5 seconds later. Once
the ambient temperature has been raised to the Heat Satisfied Point (Set point + .25 ˚F), the compressor is turned
off. The fan is turned off 30 seconds later. The figure below illustrates the basic heat pump operation.
Heat Control (Heat Pump Only)
24
Heat Pump With Electric Heat Operation
This heating is more complex due to the possibility of two heating methods. If the ambient indoor temperature is be-
low the heat demand threshold (1.5˚F below the heat set point temperature), and the compressor is not locked out,
turn on compressor. If the ambient indoor temperature is 0.25˚F above the heat set point turn off the compressor.
If the compressor is locked out & electric heat is available:
1. Turn on the electric heat until the compressor is not locked out.
2. After lockout, turn off the electric heat, wait 5 seconds, then turn on the compressor.
If Electric Heat is Available
After the Heat button is initially pressed, the unit will run the electric heater until the initial set point is satisfied (Hot Start
Feature). After the initial start, the unit will switch to Heat Pump heat and decide between Heat Pump heat and Electric
heat based on the following two monitored conditions:
Condition 1
If the outdoor coil temperature sensor drops to 30 ˚F or less for 2 consecutive minutes, the unit will switch to electric heat
if available. Thereafter, the unit will switch back to Heat Pump heat if the outdoor coil temperature sensor rises to 45 ˚F or
greater.
If Electric Heat is not available (out of order) and the outdoor coil temperature sensor drops to 30 ˚F or less for 2
consecutive minutes, then the compressor and fan will turn off. Thereafter, the unit will switch back to Heat Pump heat if
the outdoor coil temperature rises to 45 ˚F or greater.
25
Heat Pump With Electric Heat Operation (Continued)
Condition 2
If the Δ (delta) (set point temperature minus the ambient indoor temperature) is greater than 5 ˚F, then the unit will switch
to electric heat, if available. The unit will continue to operate with electric heat until the heat demand is satisfied. Note that
the electric heat switches on after the Δ temp passes 5°F and the heat pump switches off. Also note that the electric heat
will run until the heat demand is satisfied. When another heat demand cycle is initiated, the heat pump will run unless the
Δ temp is greater than the electric heat threshold.
Emergency Heat
If a compressor fails in the heating season, the Emergency Heat allows the user to override the Heat Pump and heat with
electric heat only. This is controlled via the user interface (See the User Menu Functions page 12).
Note that if heat is the first demand cycle (demand cycle = call for heat or call for cooling) after power restoration, the
control system will run electric heat for the entire cycle if the unit is equipped with electric heat.
Electric Heat Operation in Cool with Electric Heat Units
When in the Heat mode, with and without Fan Mode Auto (Fan cycling):
If the indoor ambient temperature is below the Heat Demand Threshold (Heat Set Point minus 1.5 ˚F), turn on electric
heat. If Ambient is 0.3 ˚F above the Heat Set Point turn off the electric heat.
System Mode Auto
This mode provides automatic change over between cool and heat. The auto mode runs based on the room ambient
temperature vs. the Demand Thresholds. It is only available in Heat-Cool Unit.
Notes:
The Heat Demand Threshold and the Cool Demand Threshold values are derived from the Auto Set Point in the Auto
Mode (refer to page 22). There is a buffer zone as shown in figure , where no heating or cooling is allowed to occur. It is
critical that the Cool Demand Threshold be greater than the Heat Demand Threshold by a minimum of 3° while in the Auto
System Mode. For example, if a user enters a value for the Auto Cooling Set Point that violates the minimum Δ 3° rule, the
Auto Heating Set Point will adjust accordingly. This buffer zone (BAND) can be manually adjusted from 3 to 10° (see the
BAND section page 13).
When programming the schedule, the user has the flexibility to enter the schedule automatic set point cooling (SASPC)
and the schedule automatic set point heating (SSPH) set points directly. These values are monitored to ensure that they
do not violate the minimum 3° Δ rule. If a violation is detected, the opposite set point will adjust to compensate. The
individual heating and cooling rules apply to the auto mode.
Automatic Change Over Delay (Cool with Heat Units)
The change over delay ensures that any system heating or cooling over shoot does not trigger an opposite demand cycle.
The change over delay = 15 min. This timer blocks the opposite demand cycle from running until the timer expires. As an
example, if the last demand was a cool cycle, and another cool cycle is requested, the timer will not block the request.
However, if the last demand cycle was a cool cycle, and heat cycle is requested, the timer will block the request until the
change over delay is expired.
26
Compressor Lock Out Time
The lockout feature ensures that the compressor is de-energized for a period of time. The timer varies randomly
from 180 to 240 seconds
The compressor lockout is initiated every time the compressor is “off” due to:
(1) Satisfying the temperature set point
(2) Changing mode to fan only or heat
(3) Turning the unit off
(4) Control is first plugged in or power is restored after failure
(5) Line power is restored from a brown out condition
Wait ICON (Hour Glass)
The wait icon will be turned on when the compressor is locked out and during demand for cooling or heat pump
compressor operation. The Wait ICON will be turned off when the condition clears.
Cooling Fan Delay
Fan cycle/Auto mode only
When unit cycles cooling ON – starts the fan 5 seconds EARLY. When unit cycles cooling OFF – DELAYS the fan
off for 30 seconds
Note: this fan delay is disabled during Test Mode
Heating Fan Delay
This is only for fan Mode Auto (Fan cycles with cool/heat operation) and not for continuous fan mode. When unit
cycles Heating ON – starts the fan 5 seconds EARLY. When unit cycles Heating OFF – DELAYS the fan off for 15
seconds
Note: the fan delay is disabled during Test Mode
Fan Speed Change Delay
Relay activation is delayed by a minimum number of seconds. The default for this value is 2 seconds and is used to
eliminate relay chatter.
Fan Only System Mode
The fan is turned on and runs at the specified manually set speed.
Only the Fan is turned on. Cool or Heat operation are off.
(This is different than FAN MODE CONTINUOUS where the fan is on with the cool or heat operation).
Fan Only Rules
1. If the SYSTEM FAN ONLY MODE is selected, the Auto fan mode is disabled, and the fan mode is forced to
continuous. In addition, the auto fan speed is disabled. If the user presses the fan speed key, the menu will skip over
the auto selection. The set point temperature display is off.
2. Any fan speed may be manually selected during Fan Only Mode.
27
Fan Operation (Front Panel Mode)
Heat – Cool – Auto – Fan Only
Models starting with SS, SM have 4 speeds. Models with SL, and all Kuhl+ have 3 speeds
Speed Selection
1
2
3
4
AUTO
AUTO Operation, but never
turns Off. Uses cool set point
or heat set point vs. ambient
temperature. When there is
no demand, operate at the
lowest available speed.
Continuous
"On" "
Turns
On"
Turns
"On" "
Turns
On"
Turns
Fan
On or
On or
On or
On or
AUTO operation turns On or
Off with heat or cool demand
Uses cool set point or heat
set point vs. ambient
Off with
heat or
cool
Off with
heat or
cool
Off with
heat or
cool
Off with
heat or
cool
AUTO
demand
demand
demand
demand
temperature
Mode
Fan Only
"On" "
On"
"On" "
On"
Disabled
Fan ICON Detail
The system may have a 3 or 4 speed fan. The Fan Speed ICON will Display as per the table below.
Note that in the AUTO mode, the speed of the fan will be shown by illuminating the number of bars in the speed triangle.
Fan Mapping
28
UNIT OPERATION WITH A WALL-STAT
Front Panel Display Operation in Wall-Stat Mode
The indoor ambient temperature sensor is disabled. All buttons are disabled with the following exception:
A. Maintenance commands.
B. The user menu for Freeze protection (Display/Enter button for Kuhl+ only units).
C. First Button push to illuminate the back light (display will dim).
Maintenance features are operational. This includes the Check Filter, Lock Panel, M3, M4, M5, and the Service
wrench icon. Under T-stat operation, as a default, the selected operating Mode (Cool, Heat or Fan) will not show on
the front panel. The Service ICON ( ) is displayed if a malfunction is detected.
Cool/Heat/Fan modes and Fan speed operations are controlled by the remote wall thermostat.
The fan speeds can be Low or Max for 4 speed units and Low or High for 3 speed units. (T-stat selected must have
2 speed capabilities)
Thermostat terminals requirements:
Must be single stage heat/cool.
For cooling only units: C, R, G, Y.
For cooling with electric heat units: C, R, G, Y, W.
For heat pump units: C, R, G, Y, W, B.
(See page 68 for RT5 T-Stat wiring diagrams)
During Heat Mode:
The B terminal must be continuously energized. The W terminal from the T-Stat must have 24 V AC output to call
for heat. The control board decides on whether to turn on the Heat Pump Heat (compressor) or Electric Resistance
Heat. The Y terminal should not have 24 VAC output during Heat Mode.
29
REMOVING THE FRONT COVER
REMOVING THE CHASSIS
WARNING
WARNING
ELECTRIC SHOCK HAZARD
ELECTRIC SHOCK HAZARD
Disconnect power to the unit before
servicing. Failure to follow this warning
could result in serious injury or death.
Disconnect power to the unit before
servicing. Failure to follow this warning
could result in serious injury or death.
Remove the decorative front cover. (See figure at
left). Remove the chassis Entrygard Retainer Wire by
removingthescrewatthefrontrightbottomcornerscrew
(See Figure below). Save this screw for reattachment
after reinstalling the chassis.
Remove the decorative front cover by using the tool
provided (see figure below).
Tighten the four (4) captive screws as indicated by the
arrows in the figure above before closing the front panel
(do not over tighten). Ensure the filter is in place.
Make sure curtains do not block the side air intake
Hold the cabinet stationary then use the hand grips on
both ends of the control unit support bracket to pull the
chassis out of the cabinet (see below).
Notes on reattaching the decorative front cover:
Align the cord notch over the cord and center the fresh
air lever. Align the cover over the User Interface
(UI) to ensure it is clear around it and it does not
depress any buttons. If not installed correctly the
wrench alert symbol could flash.
Before reinserting the chassis into the sleeve ensure to
properly reinstall the chassis seal gasket.
30
REPLACING THE INDOOR COIL
THERMISTOR
Replace the indoor coil sensor. Ensure to properly clip
and insulate it at the same location (see figure below).
WARNING
ELECTRIC SHOCK HAZARD
Disconnect power to the unit before
servicing. Failure to follow this warning
could result in serious injury or death.
Remove the decorative front cover (see page 30).
Remove all indicated screws below (8 total, see figure
below). Remove the Discharge Sensor and the User
Interface plugs from the control board.
REPLACING THE CONTROL BOARD
WARNING
ELECTRIC SHOCK HAZARD
Disconnect power to the unit before
servicing. Failure to follow this warning
could result in serious injury or death.
Remove the decorative front cover (see page 30).
Disconnect discharge sensor plug (red)
Disconnect the User Interface plug (white)
Remove the 3 screws indicated below.
Pull control board and mount plate out and disconnect
the following connectors from it:
Remove the screws indicated at the side and back plate
(6 total, see figure below). Partially lift the top cover and
at the same time carefully swing out from the top, the
back and side plate.
Power, capacitor, thermistors, fan, reversing valve
and heater.
Remove the hex screw holding the control board to
its mount plate. Pull out the control board (see figure
below).
Up
Swing
Out
31
Low Voltage Interface Connector
Adding a Remote Wall Thermostat
An external thermostat may be added to the air conditioner to provide
remote temperature sensing and control.
WARNING
ELECTRIC SHOCK HAZARD
Thermostat Selection
Friedrich recommends the use of either the Friedrich RT4 or RT5. These
thermostats are single stage heat/cool, manual changeover. The RT4 is a
digital display thermostat with single speed fan control. The RT5 features
a digital display, two fan speed selection, filter check light, temperature
limiting, status indicator light, room temperature offset, backlight and
battery backup. Other thermostats may be used as long as they are single
stage heat/cool and are configured correctly for the unit.
Disconnect power to the unit before
servicing. Failure to follow this warning
could result in serious injury or death.
All Kuhl and Kuhl + units have a low voltage interface connector through
which a Remote Wall Thermostat, Desk Control and Auxiliary Fan’s Relay
can be connected. The interface connector is located on the left side behind
the decorative front cover.
Thermostat terminals requirements:
For cooling only units: C, R, G, Y.
For cooling with electric heat units: C, R, G, Y, W.
For heat pump units: C, R, G, Y, W, B.
Interface Connector Location
Figure 1
For two fan speeds, thermostat must have 2 fan speed selection.
During Heat Pump Mode:
The B terminal must be continuously energized. The W terminal must have
24 VAC output to call for heat. The control board decides on whether to
turn on the Heat Pump Heat (compressor) or Electric Heat. The Y terminal
should not have 24 VAC output during heat mode.
Connecting a Remote Wall
Thermostat
Table 1
Interface Connector Definitions
Front Panel. Wire jumper between FP and
F2 enables front panel operation. Jumper off
enables remote wall t-stat operation.
FP
F2
Used with F1 to provide 24 VAC to external
fan relay. (See above for use with FP)
To enable the remote thermostat operation, remove the jumper between
terminals FP & F2 on the interface connector. Connect the thermostat
using Figure 1 and Table 1 as a guide.
Used with F2 to provide 24 VAC to
external fan relay.
F1
D2
D1
Procedure
Used with D1 for desk control on or off
operation.
1) Unplug the unit.
2) Unscrew and remove the decorative front cover. (Page 30)
Used with D2 for desk control on or off
operation.
3) Locate the Interface Connector (24 VAC terminal strip (See figure 1 at
left) and remove the jumper wire at FP and F2.
Common Ground Terminal
Call for high fan
C
GH
GL
B
4) Make the wire connections according to the configuration needed for
your unit (see above or page 68 for wiring diagrams).
Call for low fan
5) Once each wire is matched and connected, the unit is now ready to be
controlled by the thermostat.
Call for heat pump reversing valve
Call for compressor
6) Reattach the decorative front cover (see page 30).
Note: Under T-Stat operation the front panel is disabled
except the Maintenance functions (see page 29 for details).
Y
W
Call for heating
R
24V Power from Electronic Control to Wall
32
Airflow Selection and Adjustment
Remote Wall Thermostat Location
The thermostat should not be mounted where it may be affected by drafts,
discharge air from registers (hot or cold), or heat radiated from the sun
appliances, windows etc.. The thermostat should be located about 5 Ft.
above the floor in an area of average temperature, with good air circulation.
Air flow direction adjustment
left or right side of the discharge opening. Each of the banks of louvers
can be directed left, right, up or down in order to achieve the most optimum
Mercury bulb type thermostats MUST be level to control temperature
accurately to the desired set-point. Electronic digital type thermostats
should be level for aesthetics.
move it in the direction that you would like the air to be directed. Please
louvers than the other.
Fresh air and exhaust control
Your air conditioner has the ability to bring fresh air into the room or exhaust
stale air out of the room. The control slide is found on the upper part of
the unit (See Figure).
TO BRING IN FRESH AIR – Move the lever to the Fresh Air
position
which allows outside air to enter the room. This is useful in fall and spring as
a means of bringing in fresh outside air when using FAN ONLY . It can also
be used in the summer with the compressor in the Cooling Mode if you wish.
TO EXHAUST INDOOR AIR – Move the lever to the Exhaust
position. This will allow stale air to be expelled to the outside of the dwelling.
This is especially handy in the spring or fall when indoor air tends to get
stale, or after a social gathering involving smokers, or to remove cooking
odors.
BEST PERFORMANCE – Move the lever to the Re-Circulate Position
Note: An improperly operating or poorly located remote wall thermostat
can be the source of perceived equipment problems. A careful check of the
thermostat’s location and wiring must be made then to ensure that it is not
the source of problems.
Desk Control
The unit’s electronic control has built-in provisions for connection to an
external switch to control power to the unit. The switch can be a central
desk control system or even a normally open door switch.
For desk control operation, connect one side of the switch to the D1
terminal and the other to the D2 terminal (See page 32). Whenever the
switch closes, the unit operation will stop.
Maximum Wire Length for Desk Control Switch
Auxiliary Fan Control
The electronic control also has the ability to control a 24 VAC relay to
activate an auxiliary, or transfer fan. The outputs are listed as F1 and F2 on
the interface connector (See page 32).
To connect the relay, simply wire one side of the relay to F1 and the other
side to F2. Anytime that the fan runs, the terminals will send a 24 VAC
signal to the relay. The relay must be 24 VAC, 50mA or less.
Note: The Desk Control, Auxiliary Fan relay and wires must be field supplied.
33
COMPONENTS TESTING
CAPACITORS
FAN MOTOR
A single phase permanent split capacitor motor is used to drive
the evaporator blower and condenser fan. A self-resetting
overload is located inside the motor to protect against high
temperature and high amperage conditions. (See Figure 23)
WARNING
ELECTRIC SHOCK HAZARD
Turn off electric power before servicing.
Discharge capacitor with a 20,000 Ohm 2 Watt
resistor before handling.
WARNING
ELECTRIC SHOCK HAZARD
Failure to do so may result in personal injury,
or death.
Disconnect power to the unit before
servicing. Failure to follow this warning
could result in serious injury or death.
Many motor capacitors are internally fused. Shorting the
terminals will blow the fuse, ruining the capacitor. A 20,000
ohm 2 watt resistor can be used to discharge capacitors
safely. Remove wires from capacitor and place resistor
across terminals. When checking a dual capacitor with
a capacitor analyzer or ohmmeter, both sides must be
tested.
BLOWER/FAN MOTOR - TEST
1. Determine that capacitor is serviceable.
2. Disconnect fan motor wires from fan speed switch or
system switch.
Capacitor Check with Capacitor Analyzer
3. Apply “live” test cord probes on black wire and common
terminal of capacitor. Motor should run at high speed.
The capacitor analyzer will show whether the capacitor is
“open” or “shorted.” It will tell whether the capacitor is within
its micro farads rating and it will show whether the capacitor
is operating at the proper power-factor percentage. The
instrument will automatically discharge the capacitor when
the test switch is released.
4. Apply “live” test cord probes on red wire and common
terminal of capacitor. Motor should run at low speed.
5. Apply “live” test cord probes on each of the remaining
wires from the speed switch or system switch to test
intermediatespeeds. Ifthecontrolisinthe“MoneySaver”
mode and the thermostat calls for cooling, the fan will
start - then stop after approximately 2 minutes; then the
fan and compressor will start together approximately 2
minutes later.
Capacitor Connections
The starting winding of a motor can be damaged by a
shorted and grounded running capacitor. This damage
usually can be avoided by proper connection of the running
capacitor terminals.
From the supply line on a typical 230 volt circuit, a 115 volt
potential exists from the “R” terminal to ground through a
possible short in the capacitor. However, from the “S” or
start terminal, a much higher potential, possibly as high as
400 volts, exists because of the counter EMF generated
in the start winding. Therefore, the possibility of capacitor
failure is much greater when the identified terminal is
connected to the “S” or start terminal. The identified
terminal should always be connected to the supply line, or
“R” terminal, never to the “S” terminal.
Blower/Fan Motor
When connected properly, a shorted or grounded running
capacitor will result in a direct short to ground from the “R”
terminal and will blow the line fuse. The motor protector
will protect the main winding from excessive temperature.
Dual Rated Run Capacitor Hook-up
34
COMPONENTS TESTING
HEATING ELEMENT
TESTING THE HEATING ELEMENT
All heat pumps and electric heat models are equipped
with a heating element with the exception of model
YS10M10. The other “YS” and “ES” models are
equipped with a 3.3 KW element. The “YM” and “EM”
models are equipped with a 4.0 KW element. The
“YL” and “EL” models are equipped with a 5.2 KW
element.
WARNING
ELECTRIC SHOCK HAZARD
Disconnect power to the unit before
servicing. Failure to follow this warning
could result in serious injury or death.
Testing of the elements can be made with an ohmmeter
across the terminals after the connecting wires
have been removed. A cold resistance reading of
approximately 14.5 ohms for the 3.3 KW heater, 11.9
ohms for the 4.0 KW heater and 9.15 ohms for the 5.2
KW heater should be registered.
Heating Element
Sample
DRAIN PAN VALVE
During the cooling mode of operation, condensate
which collects in the drain pan is picked up by the con-
denser fan blade and sprayed onto the condenser coil.
This assists in cooling the refrigerant plus evaporating
the water.
The heating element contains a fuse link and a heater
limit switch. The fuse link is in series with the power
supply and will open and interrupt the power when the
temperature reaches 199°F or a short circuit occurs in
the heating element. Once the fuse link separates, a
new fuse link must be installed.
During the heating mode of operation, it is necessary
that water be removed to prevent it from freezing during
cold outside temperatures. This could cause the con-
denser fan blade to freeze in the accumulated water
and prevent it from turning.
NOTE:
Always replace with the exact
replacement.
The heater element has a high limit control. This
control is a bimetal thermostat mounted in the top of
the heating element.
To provide a means of draining this water, a bellows
type drain valve is installed over a drain opening in the
base pan.
Should the fan motor fail or filter become clogged,
the high limit control will open and interrupt power to
the heater before reaching an unsafe temperature
condition.
This valve is temperature sensitive and will open when
the outside temperature reaches 40°F. The valve will
close gradually as the temperature rises above 40°F to
fully close at 60°F.
The control is designed to open at 110°F ±6°F. Test
continuity below 110°F and for open above 110°F.
Bellows Assembly
Drain Pan Valve
HEATING ELEMENT (Heat Pump Models)
The heating element for the “Y” model is energized
by an outdoor thermistor via the electronic control
board. The outdoor defrost thermistor is adjusted at
a predetermined temperature to bring on the heating
element and turn off the compressor. The room
35
REFRIGERATION SEQUENCE OF OPERATION
A good understanding of the basic operation of the
refrigeration system is essential for the service technician.
Without this understanding, accurate troubleshooting of
refrigeration system problems will be more difficult and time
consuming, if not (in some cases) entirely impossible. The
refrigeration system uses four basic principles (laws) in its
operation they are as follows:
The refrigerant leaves the condenser Coil through the liquid
line as a warm high pressure liquid. It next will pass through
the refrigerant drier (if so equipped). It is the function of the
driertotrapanymoisturepresentinthesystem,contaminants,
and large particulate matter.
The liquid refrigerant next enters the metering device. The
metering device is a capillary tube. The purpose of the
metering device is to “meter” (i.e. control or measure) the
quantity of refrigerant entering the evaporator coil.
1. “Heat always flows from a warmer body to a cooler
body.”
2. “Heat must be added to or removed from a substance
before a change in state can occur”
In the case of the capillary tube this is accomplished (by
design) through size (and length) of device, and the pressure
difference present across the device.
3. “Flow is always from a higher pressure area to a lower
pressure area.”
Since the evaporator coil is under a lower pressure (due to
the suction created by the compressor) than the liquid line,
the liquid refrigerant leaves the metering device entering the
evaporator coil. As it enters the evaporator coil, the larger
area and lower pressure allows the refrigerant to expand
and lower its temperature (heat intensity). This expansion is
often referred to as “boiling”. Since the unit’s blower is moving
indoor air across the finned surface of the evaporator coil,
the expanding refrigerant absorbs some of that heat. This
results in a lowering of the indoor air temperature, hence the
“cooling” effect.
4. “The temperature at which a liquid or gas changes state
is dependent upon the pressure.”
The refrigeration cycle begins at the compressor. Starting
the compressor creates a low pressure in the suction line
which draws refrigerant gas (vapor) into the compressor.
The compressor then “compresses” this refrigerant, raising
its pressure and its (heat intensity) temperature.
The refrigerant leaves the compressor through the discharge
Line as a hot High pressure gas (vapor). The refrigerant
enters the condenser coil where it gives up some of its
heat. The condenser fan moving air across the coil’s finned
surface facilitates the transfer of heat from the refrigerant to
the relatively cooler outdoor air.
The expansion and absorbing of heat cause the liquid
refrigerant to evaporate (i.e. change to a gas). Once the
refrigerant has been evaporated (changed to a gas), it is
heated even further by the air that continues to flow across
the evaporator coil.
When a sufficient quantity of heat has been removed from
the refrigerant gas (vapor), the refrigerant will “condense”
(i.e. change to a liquid). Once the refrigerant has been
condensed (changed) to a liquid it is cooled even further by
the air that continues to flow across the condenser coil.
The particular system design determines at exactly what
point (in the evaporator) the change of state (i.e. liquid to a
gas) takes place. In all cases, however, the refrigerant must
be totally evaporated (changed) to a gas before leaving the
evaporator coil.
The RAC design determines at exactly what point (in the
condenser) the change of state (i.e. gas to a liquid) takes
place. In all cases, however, the refrigerant must be
totally condensed (changed) to a Liquid before leaving the
condenser coil.
The low pressure (suction) created by the compressor
causes the refrigerant to leave the evaporator through the
suction line as a cool low pressure vapor. The refrigerant then
returns to the compressor, where the cycle is repeated.
Suction
Line
Discharge
Line
Condenser
Coil
Evaporator
Coil
Compressor
Metering
Device
Refrigerant Drier
Liquid
Line
Refrigerant
Strainer
36
R-410A SEALED SYSTEM REPAIR CONSIDERATIONS
WARNING
Refrigeration system under high pressure
Do not puncture, heat, expose to flame or incinerate.
Only certified refrigeration technicians should
service this equipment.
R410A systems operate at higher pressures than
R22 equipment. Appropriate safe service and
handling practicces must be used.
Only use gauge sets designed for use with R410A.
Do not use standard R22 gauge sets.
The following is a list of important considerations when working with R-410A equipment
•
•
•
R-410A pressure is approximately 60% higher than R-22 pressure.
R-410A cylinders must not be allowed to exceed 125 F, they may leak or rupture.
R-410A must never be pressurized with a mixture of air, it may become
flammable.
•
•
Servicing equipment and components must be specifically designed for use with R-410A and
dedicated to prevent contamination.
Manifold sets must be equipped with gauges capable of reading 750 psig (high side) and 200
psig (low side), with a 500-psig low-side retard.
•
•
Gauge hoses must have a minimum 750-psig service pressure rating
Recovery cylinders must have a minimum service pressure rating of 400 psig, (DOT 4BA400
and DOT BW400 approved cylinders).
•
•
POE (Polyol-Ester) lubricants must be used with R-410A equipment.
To prevent moisture absorption and lubricant contamination, do not leave the refrigeration
system open to the atmosphere longer than 1 hour.
•
•
•
•
Weigh-in the refrigerant charge into the high side of the system.
Introduce liquid refrigerant charge into the high side of the system.
For low side pressure charging of R-410A, use a charging adaptor.
Use Friedrich approved R-410A filter dryers only.
37
R-410A SEALED REFRIGERATION SYSTEM REPAIRS
IMPORTANT
SEALED SYSTEM REPAIRS TO COOL-ONLY MODELS REQUIRE THE INSTALLATION OF A LIQUID LINE DRIER.
EQUIPMENT REQUIRED:
9. High Pressure Gauge - (0 to 750 lbs.)
10. Low Pressure Gauge - (-30 to 200 lbs.)
11. Vacuum Gauge - (0 - 1000 microns)
1. Voltmeter
2. Ammeter
3. Ohmmeter
12. Facilities for flowing nitrogen through refrigeration tubing
4. E.P.A. Approved Refrigerant Recovery System
during all brazing processes.
5. Vacuum Pump (capable of 200 microns or less
vacuum.)
EQUIPMENT MUST BE CAPABLE OF:
6. Acetylene Welder
1. Recovering refrigerant to EPA required levels.
7. Electronic Halogen Leak Detector capable of
2. Evacuation from both the high side and low side of the
system simultaneously.
detecting HFC (Hydrofluorocarbon) refrigerants.
8. Accurate refrigerant charge measuring device such
as:
3. Introducing refrigerant charge into high side of the
system.
a. Balance Scales - 1/2 oz. accuracy
b. Charging Board - 1/2 oz. accuracy
4. Accurately weighing the refrigerant charge introduced
into the system.
Proper refrigerant charge is essential to proper unit operation.
Operating a unit with an improper refrigerant charge will
result in reduced performance (capacity) and/or efficiency.
Accordingly, the use of proper charging methods during
servicing will insure that the unit is functioning as designed
and that its compressor will not be damaged.
WARNING
RISK OF ELECTRIC SHOCK
Unplug and/or disconnect all electrical power
to the unit before performing inspections,
maintenances or service.
Failure to do so could result in electric shock,
serious injury or death.
Too much refrigerant (overcharge) in the system is just as bad
(if not worse) than not enough refrigerant (undercharge). They
both can be the source of certain compressor failures if they
remain uncorrected for any period of time. Quite often, other
problems (such as low air flow across evaporator, etc.) are
misdiagnosed as refrigerant charge problems. The refrigerant
circuit diagnosis chart will assist you in properly diagnosing
these systems.
WARNING
HIGH PRESSURE HAZARD
Sealed Refrigeration System contains refrigerant
and oil under high pressure.
An overcharged unit will at times return liquid refrigerant
(slugging) back to the suction side of the compressor eventually
causing a mechanical failure within the compressor. This
mechanical failure can manifest itself as valve failure, bearing
failure, and/or other mechanical failure. The specific type of
failure will be influenced by the amount of liquid being returned,
and the length of time the slugging continues.
Proper safety procedures must be followed,
and proper protective clothing must be worn
when working with refrigerants.
Failure to follow these procedures could
result in serious injury or death.
Refrigerant Charging
Not enough refrigerant (undercharge) on the other hand, will
cause the temperature of the suction gas to increase to the point
where it does not provide sufficient cooling for the compressor
motor. When this occurs, the motor winding temperature will
increase causing the motor to overheat and possibly cycle open
the compressor overload protector. Continued overheating of
the motor windings and/or cycling of the overload will eventually
lead to compressor motor or overload failure.
NOTE: Because the RAC system is a sealed system, service
process tubes will have to be installed. First install a line tap
and remove refrigerant from system. Make necessary sealed
system repairs and vacuum system. Crimp process tube
line and solder end shut. Do not leave a service valve in the
sealed system.
38
Method Of Charging / Repairs
The acceptable method for charging the WallMaster system
is the Weighed in Charge Method. The weighed in charge
method is applicable to all units. It is the preferred method to
use, as it is the most accurate.
The weighed in method should always be used whenever
a charge is removed from a unit such as for a leak repair,
compressor replacement, or when there is no refrigerant
charge left in the unit. To charge by this method, requires the
following steps:
1. Install a piercing valve to remove refrigerant from the
sealedsystem. (Piercing valve must be removed from the
system before recharging.)
2. Recover Refrigerant in accordance with EPA regulations.
WARNING
BURN HAZARD
Proper safety procedures must be followed,
and proper protective clothing must be worn
when working with a torch.
Failure to follow these procedures could
result in moderate or serious injury.
3. Install a process tube to sealed system.
CAUTION
FREEZE HAZARD
Proper safety procedures must be followed,
and proper protective clothing must be worn
when working with liquid refrigerant.
Failure to follow these procedures could
result in minor to moderate injury.
4. Make necessary repairs to system.
5. Evacuate system to 200 microns or less.
6. Weigh in refrigerant with the property quantity of R-410A
refrigerant.
7. Start unit, and verify performance.
WARNING
BURN HAZARD
Proper safety procedures must be followed,
and proper protective clothing must be worn
when working with a torch.
Failure to follow these procedures could
result in moderate or serious injury.
8. Crimp the process tube and solder the end shut.
39
WARNING
WARNING
ELECTRIC SHOCK HAZARD
Turn off electric power before service or
installation.
HIGH PRESSURE HAZARD
Sealed Refrigeration System contains refrigerant
and oil under high pressure.
Extreme care must be used, if it becomes
necessary to work on equipment with power
applied.
Proper safety procedures must be followed,
and proper protective clothing must be worn
when working with refrigerants.
Failure to do so could result in serious injury or
death.
Failure to follow these procedures could
result in serious injury or death.
Undercharged Refrigerant Systems
An undercharged system will result in poor performance
(low pressures, etc.) in both the heating and cooling
cycle.
A check of the amperage drawn by the compressor
motor should show a lower reading. (Check the Unit
Specification.) After the unit has run 10 to 15 minutes,
check the gauge pressures. Gauges connected to system
with an undercharge will have low head pressures and
substantially low suction pressures.
Whenever you service a unit with an undercharge of
refrigerant, always suspect a leak. The leak must be
repaired before charging the unit.
To check for an undercharged system, turn the unit on,
allow the compressor to run long enough to establish
working pressures in the system (15 to 20 minutes).
During the cooling cycle you can listen carefully at the exit
of the metering device into the evaporator; an intermittent
hissing and gurgling sound indicates a low refrigerant
charge. Intermittent frosting and thawing of the evaporator
is another indication of a low charge, however, frosting
and thawing can also be caused by insufficient air over
the evaporator.
Checks for an undercharged system can be made at
the compressor. If the compressor seems quieter than
normal, it is an indication of a low refrigerant charge.
of the evaporator will not be encountered because the
refrigerant will boil later if at all. Gauges connected to
system will usually have higher head pressure (depending
upon amount of over charge). Suction pressure should be
slightly higher.
Overcharged Refrigerant Systems
Compressor amps will be near normal or higher.
Noncondensables can also cause these symptoms. To
confirm, remove some of the charge, if conditions improve,
system may be overcharged. If conditions don’t improve,
Noncondensables are indicated.
Whenever an overcharged system is indicated, always
make sure that the problem is not caused by air flow
problems. Improper air flow over the evaporator coil may
indicate some of the same symptoms as an over charged
system.
An overcharge can cause the compressor to fail, since it
would be “slugged” with liquid refrigerant.
Thechargeforanysystemiscritical. Whenthecompressor
is noisy, suspect an overcharge, when you are sure that
the air quantity over the evaporator coil is correct. Icing
40
Restricted Refrigerant System
Troubleshooting a restricted refrigerant system can be
difficult. The following procedures are the more common
problems and solutions to these problems. There are two
types of refrigerant restrictions: Partial restrictions and
complete restrictions.
at the metering device entrance to the evaporator. The
evaporator in a partial restriction could be partially frosted
or have an ice ball close to the entrance of the metering
device. Frost may continue on the suction line back to the
compressor.
A partial restriction allows some of the refrigerant to
circulate through the system.
Often a partial restriction of any type can be found by feel,
as there is a temperature difference from one side of the
restriction to the other.
With a complete restriction there is no circulation of
refrigerant in the system.
With a complete restriction, there will be no sound at the
metering device entrance. An amperage check of the
compressor with a partial restriction may show normal
current when compared to the unit specifi cation. With a
complete restriction the current drawn may be considerably
less than normal, as the compressor is running in a deep
vacuum (no load.) Much of the area of the condenser will
be relatively cool since most or all of the liquid refrigerant
will be stored there.
Restricted refrigerant systems display the same symptoms
as a “low-charge condition.”
When the unit is shut off, the gauges may equalize very
slowly.
Gauges connected to a completely restricted system will
run in a deep vacuum. When the unit is shut off, the gauges
will not equalize at all.
The following conditions are based primarily on a system
in the cooling mode.
A quick check for either condition begins at the evaporator.
With a partial restriction, there may be gurgling sounds
41
HERMETIC COMPONENTS CHECK
WARNING
BURN HAZARD
WARNING
Proper safety procedures must be followed,
and proper protective clothing must be worn
when working with a torch.
CUT/SEVER HAZARD
Be careful with the sharp edges and corners.
Wear protective clothing and gloves, etc.
Failure to follow these procedures could
result in moderate or serious injury.
Failure to do so could result in serious injury.
METERING DEVICE
Capillary Tube Systems
All units are equipped with capillary tube metering
devices.
3. Switch the unit to the heating mode and observe the
gauge readings after a few minutes running time. If
the system pressure is lower than normal, the heating
capillary is restricted.
Checking for restricted capillary tubes.
1. Connect pressure gauges to unit.
4. If the operating pressures are lower than normal in both
the heating and cooling mode, the cooling capillary is
restricted.
2. Start the unit in the cooling mode. If after a few minutes
of operation the pressures are normal, the check valve
and the cooling capillary are not restricted.
CHECK VALVE
In the heating mode of operation, high pressure refrigerant
enters the check valve from the opposite direction, closing
the port (liquid line) to the outdoor coil. The flow path of
the refrigerant is then through the filter drier and heating
capillary to the outdoor coil.
A unique two-way check valve is used on the reverse cycle
heat pumps. It is pressure operated and used to direct the
flow of refrigerant through a single filter drier and to the
proper capillary tube during either the heating or cooling
cycle.
Failure of the slide in the check valve to seat properly in
either mode of operation will cause flooding of the cooling
coil. This is due to the refrigerant bypassing the heating or
cooling capillary tube and entering the liquid line.
One-way Check Valve
(Heat Pump Models)
COOLING MODE
In the cooling mode of operation, liquid refrigerant from
condenser (liquid line) enters the cooling check valve
forcing the heating check valve shut. The liquid refrigerant
is directed into the liquid dryer after which the refrigerant
is metered through cooling capillary tubes to evaporator.
(Note: liquid refrigerant will also be directed through the
heating capillary tubes in a continuous loop during the
cooling mode).
NOTE: The slide (check) inside the valve is made of teflon.
Should it become necessary to replace the check valve,
place a wet cloth around the valve to prevent overheating
during the brazing operation.
CHECK VALVE OPERATION
HEATING MODE
In the cooling mode of operation, high pressure liquid enters
the check valve forcing the slide to close the opposite port
(liquid line) to the indoor coil. Refer to refrigerant flow chart.
This directs the refrigerant through the filter drier and cooling
capillary tube to the indoor coil.
In the heating mode of operation, liquid refrigerant from
the indoor coil enters the heating check valve forcing the
cooling check valve shut. The liquid refrigerant is directed
into the liquid dryer after which the refrigerant is metered
through the heating capillary tubes to outdoor coils. (Note:
liquid refrigerant will also be directed through the cooling
capillary tubes in a continuous loop during the heating
mode).
42
REVERSING VALVE DESCRIPTION/OPERATION
WARNING
ELECTRIC SHOCK HAZARD
Disconnect power to the unit before servicing.
Failure to follow this warning could result in
serious injury or death.
The Reversing Valve controls the direction of refrigerant
“A”and“B”portsofthepilotvalve.Athirdcapillaryisacommon
return line from these ports to the suction tube on the main
valve body. Four-way reversing valves also have a capillary
tube from the compressor discharge tube to the pilot valve.
flow to the indoor and outdoor coils. It consists of a
pressure-operated, main valve and a pilot valve actuated
by a solenoid plunger. The solenoid is energized during the
heating cycle only. The reversing valves used in the RAC
system is a 2-position, 4-way valve.
The piston assembly in the main valve can only be shifted
by the pressure differential between the high and low sides
of the system. The pilot section of the valve opens and
closes ports for the small capillary tubes to the main valve
to cause it to shift.
The single tube on one side of the main valve body is the
high-pressure inlet to the valve from the compressor. The
center tube on the opposite side is connected to the low
pressure (suction) side of the system. The other two are
connected to the indoor and outdoor coils. Small capillary
tubes connect each end of the main valve cylinder to the
NOTE: System operating pressures must be near
normal before valve can shift.
43
TESTING THE REVERSING VALVE
SOLENOID COIL
Should the valve fail to shift from coooling to heating,
block the air flow through the outdoor coil and allow the
discharge pressure to build in the system. Then switch
the system from heating to cooling.
WARNING
ELECTRIC SHOCK HAZARD
Unplug and/or disconnect all electrical power
to the unit before performing inspections,
maintenances or service.
If the valve is stuck in the heating position, block the air
flow through the indoor coil and allow discharge pressure
to build in the system. Then switch the system from
heating to cooling.
Failure to do so could result in electric shock,
serious injury or death.
Should the valve fail to shift in either position after
increasing the discharge pressure, replace the valve.
The solenoid coil is an electromagnetic type coil mounted
on the reversing valve and is energized during the
operation of the compressor in the heating cycle.
Dented or damaged valve body or capillary tubes can
prevent the main slide in the valve body from shifting.
1. Turn off high voltage electrical power to unit.
2. Unplug line voltage lead from reversing valve coil.
If you determing this is the problem, replace the reversing
valve.
3. Check for electrical continuity through the coil. If you
do not have continuity replace the coil.
After all of the previous inspections and checks have
been made and determined correct, then perform the
“Touch Test” on the reversing valve.
4. Check from each lead of coil to the copper liquid line
as it leaves the unit or the ground lug. There should
be no continuity between either of the coil leads
and ground; if there is, coil is grounded and must be
replaced.
5. If coil tests okay, reconnect the electrical leads.
6. Make sure coil has been assembled correctly.
NOTE: Do not start unit with solenoid coil removed from
valve, or do not remove coil after unit is in operation. This
will cause the coil to burn out.
CHECKING THE REVERSING VALVE
NOTE: You must have normal operating pressures before
the reversing valve can shift.
WARNING
HIGH PRESSURE HAZARD
Sealed Refrigeration System contains refrigerant
and oil under high pressure.
Reversing Valve in Heating Mode
Proper safety procedures must be followed,
and proper protective clothing must be worn
when working with refrigerants.
Failure to follow these procedures could
result in serious injury or death.
Check the operation of the valve by starting the system
and switching the operation from “Cooling” to “Heating”
and then back to “Cooling”. Do not hammer on valve.
Occasionally, the reversing valve may stick in the heating
or cooling position or in the mid-position.
When sluggish or stuck in the mid-position, part of the
discharge gas from the compressor is directed back to the
suction side, resulting in excessively high suction pressure.
44
Touch Test in Heating/Cooling Cycle
6. Protectnewvalvebodyfromheatwhilebrazingwith plastic
heat sink (Thermo Trap) or wrap valve body with wet
rag.
WARNING
BURN HAZARD
Certain unit components operate at
temperatures hot enough to cause burns.
7. Fit all lines into new valve and braze lines into new
valve.
Proper safety procedures must be followed,
and proper protective clothing must be
worn.
WARNING
EXPLOSION HAZARD
Failure to follow these procedures could
result in minor to moderate injury.
The use of nitrogen requires a pressure
regulator. Follow all safety procedures and
wear protective safety clothing etc.
The only definite indications that the slide is in the mid-
position is if all three tubes on the suction side of the valve
are hot after a few minutes of running time.
Failure to follow proper safety procedures
could result in serious injury or death.
8. Pressurize sealed system with a combination of R-410A
and nitrogen and check for leaks, using a suitable leak
detector. Recover refrigerant per EPA guidelines.
NOTE: A condition other than those illustrated above, and
on Page 44, indicate that the reversing valve is not shifting
properly. Both tubes shown as hot or cool must be the same
corresponding temperature.
9. Once the sealed system is leak free, install solenoid coil
on new valve and charge the sealed system by weighing
in the proper amount and type of refrigerant as shown
on rating plate. Crimp the process tubes and solder the
ends shut. Do not leave Schrader or piercing valves in
the sealed system.
Procedure For Changing Reversing Valve
WARNING
HIGH PRESSURE HAZARD
Sealed Refrigeration System contains refrigerant
and oil under high pressure.
NOTE: When brazing a reversing valve into the system, it is
of extreme importance that the temperature of the valve does
not exceed 250°F at any time.
Proper safety procedures must be followed,
and proper protective clothing must be worn
when working with refrigerants.
Wrap the reversing valve with a large rag saturated with
water. “Re-wet” the rag and thoroughly cool the valve after
each brazing operation of the four joints involved.
Failure to follow these procedures could
result in serious injury or death.
The wet rag around the reversing valve will eliminate
conduction of heat to the valve body when brazing the line
connection.
NOTICE
FIRE HAZARD
The use of a torch requires extreme care and proper
judgment. Follow all safety recommended precautions
and protect surrounding areas with fire proof materials.
Have a fire extinguisher readily available. Failure to follow
this notice could result in moderate to serious property
damage.
1. Install Process Tubes. Recover refrigerant from sealed
system. PROPER HANDLING OF RECOVERED
REFRIGERANT ACCORDING TO EPA REGULATIONS
IS REQUIRED.
2. Remove solenoid coil from reversing valve. If coil is to
be reused, protect from heat while changing valve.
3. Unbraze all lines from reversing valve.
4. Clean all excess braze from all tubing so that they will
slip into fittings on new valve.
5. Remove solenoid coil from new valve.
45
COMPRESSOR CHECKS
Heat generated within the compressor shell, usually due
to recycling of the motor, is slow to dissipate. It may take
anywhere from a few minutes to several hours for the
overload to reset.
WARNING
ELECTRIC SHOCK HAZARD
Turn off electric power before service or
installation. Extreme care must be used, if it
becomes necessary to work on equipment with
power applied.
Checking the Overloads
Failure to do so could result in serious injury or
death.
WARNING
ELECTRIC SHOCK HAZARD
Locked Rotor Voltage (L.R.V.) Test
Turn off electric power before service or
installation. Extreme care must be used, if it
becomes necessary to work on equipment
with power applied.
Locked rotor voltage (L.R.V.) is the actual voltage available
at the compressor under a stalled condition.
Single Phase Connections
Failure to do so could result in serious injury or
death.
Disconnect power from unit. Using a voltmeter, attach one
lead of the meter to the run “R” terminal on the compressor
and the other lead to the common “C” terminal of the com-
pressor. Restore power to unit.
WARNING
BURN HAZARD
Certain unit components operate at
temperatures hot enough to cause burns.
Determine L.R.V.
Start the compressor with the volt meter attached; then stop
the unit. Attempt to restart the compressor within a couple
of seconds and immediately read the voltage on the meter.
The compressor under these conditions will not start and will
usually kick out on overload within a few seconds since the
pressures in the system will not have had time to equalize.
Voltage should be at or above minimum voltage of 197 VAC,
as specified on the rating plate. If less than minimum, check
for cause of inadequate power supply; i.e., incorrect wire
size, loose electrical connections, etc.
Proper safety procedures must be followed,
and proper protective clothing must be
worn.
Failure to follow this warning could result
in moderate to serious injury.
External Overloads
With power off, remove the leads from compressor
terminals. If the compressor is hot, allow the overload
to cool before starting check. Using an ohmmeter, test
continuity across the terminals of the external overload.
If you do not have continuity; this indicates that the
overload is open and must be replaced.
Amperage (L.R.A.) Test
The running amperage of the compressor is the most
important of these readings. A running amperage higher
than that indicated in the performance data indicates that a
problem exists mechanically or electrically.
Interrnal Overloads
Some model compressors are equipped with an internal
overload. The overload is embedded in the motor
windings to sense the winding temperature and/or current
draw. The overload is connected in series with the
common motor terminal.
Single Phase Running and L.R.A. Test
NOTE: Consult the specification and performance section
for running amperage. The L.R.A. can also be found on the
rating plate.
Select the proper amperage scale and clamp the meter
probe around the wire to the “C” terminal of the compressor.
Should the internal temperature and/or current draw
become excessive, the contacts in the overload will
open, turning off the compressor. The overload will
automatically reset, but may require several hours before
the heat is dissipated.
Turn on the unit and read the running amperage on the
meter. If the compressor does not start, the reading will
indicate the locked rotor amperage (L.R.A.).
Checking the Internal Overload
1. With no power to unit, remove the leads from the
compressor terminals.
2. Using an ohmmeter, test continuity between terminals
C-S and C-R. If no continuity, the compressor overload is
open and the compressor must be replaced.
Overloads
The compressor is equipped with either an external or
internal overload which senses both motor amperage
and winding temperature. High motor temperature or
amperage heats the overload causing it to open, breaking
the common circuit within the compressor.
46
Single Phase Resistance Test
Many compressor failures are caused by the following
conditions:
WARNING
ELECTRIC SHOCK HAZARD
1. Improper air flow over the evaporator.
Turn off electric power before service or
2. Overcharged refrigerant system causing liquid to be
returned to the compressor.
installation. Extreme care must be used, if it
becomes necessary to work on equipment
with power applied.
3. Restricted refrigerant system.
4. Lack of lubrication.
Failure to do so could result in serious injury or
death.
Remove the leads from the compressor terminals and set
the ohmmeter on the lowest scale (R x 1).
5. Liquid refrigerant returning to compressor causing oil
to be washed out of bearings.
Touch the leads of the ohmmeter from terminals common
to start (“C” to “S”). Next, touch the leads of the ohmmeter
from terminals common to run (“C” to “R”).
6.
Noncondensables such as air and moisture in
the system. Moisture is extremely destructive to a
refrigerant system.
Add values “C” to “S” and “C” to “R” together and
check resistance from start to run terminals (“S” to “R”).
Resistance “S” to “R” should equal the total of “C” to “S”
and “C” to “R.”
7. Capacitor (see page 34).
CHECKING COMPRESSOR EFFICIENCY
In a single phase PSC compressor motor, the highest
value will be from the start to the run connections (“S” to
“R”). The next highest resistance is from the start to the
common connections (“S” to “C”). The lowest resistance
is from the run to common. (“C” to “R”) Before replacing a
compressor, check to be sure it is defective.
The reason for compressor inefficiency is normally due
to broken or damaged suction and/or discharge valves,
reducing the ability of the compressor to pump refrigerant
gas.
WARNING
HIGH PRESSURE HAZARD
GROUND TEST
Use an ohmmeter set on its highest scale. Touch one
lead to the compressor body (clean point of contact as
a good connection is a must) and the other probe in turn
to each compressor terminal. If a reading is obtained the
compressor is grounded and must be replaced.
Sealed Refrigeration System contains refrigerant
and oil under high pressure.
Proper safety procedures must be followed,
and proper protective clothing must be worn
when working with refrigerants.
Check the complete electrical system to the compressor
and compressor internal electrical system, check to be
certain that compressor is not out on internal overload.
Failure to follow these procedures could
result in serious injury or death.
This condition can be checked as follows:
Complete evaluation of the system must be made
whenever you suspect the compressor is defective. If
the compressor has been operating for sometime, a
careful examination must be made to determine why the
compressor failed.
1. Install a piercing valve on the suction and discharge or
liquid process tube.
-
2. Attach gauges to the high and low sides of the system.
3. Start the system and run a “cooling or heating perfor
mance test.” If test shows:
A. Below normal high side pressure
B. Above normal low side pressure
C. Low temperature difference across coil
The compressor valves are faulty - replace the
compressor.
47
COMPRESSOR REPLACEMENT
Recommendedprocedureforcompressor
replacement
3. After all refrigerant has been recovered, disconnect
suction and discharge lines from the compressor and
remove compressor. Be certain to have both suction
and discharge process tubes open to atmosphere.
WARNING
4. Carefully pour a small amount of oil from the suction
RISK OF ELECTRIC SHOCK
Unplug and/or disconnect all electrical power
to the unit before performing inspections,
maintenances or service.
stub of the defective compressor into a clean
container.
5. Using an acid test kit (one shot or conventional kit), test
the oil for acid content according to the instructions
with the kit.
Failure to do so could result in electric shock,
serious injury or death.
6. If any evidence of a burnout is found, no matter how
slight, the system will need to be cleaned up following
proper procedures.
1. Be certain to perform all necessary electrical and
refrigeration tests to be sure the compressor is
actually defective before replacing.
7. Install the replacement compressor.
WARNING
WARNING
HIGH PRESSURE HAZARD
Sealed Refrigeration System contains refrigerant
and oil under high pressure.
EXPLOSION HAZARD
The use of nitrogen requires a pressure
regulator. Follow all safety procedures and
wear protective safety clothing etc.
Proper safety procedures must be followed,
and proper protective clothing must be worn
when working with refrigerants.
Failure to follow proper safety procedures
result in serious injury or death.
Failure to follow these procedures could
result in serious injury or death.
8. Pressurize with a combination of R-410A and nitrogen
and leak test all connections with an electronic or
Halide leak detector. Recover refrigerant and repair
any leaks found.
2. Recover all refrigerant from the system though
the process tubes. PROPER HANDLING OF
RECOVERED REFRIGERANT ACCORDING TO
EPA REGULATIONS IS REQUIRED. Do not use
gauge manifold for this purpose if there has been
a burnout. You will contaminate your manifold and
hoses. Use a Schrader valve adapter and copper
tubing for burnout failures.
Repeat Step 8 to insure no more leaks are present.
9. Evacuate the system with a good vacuum pump capable
of a final vacuum of 200 microns or less. The system
should be evacuated through both liquid line and suction
line gauge ports. While the unit is being evacuated, seal
all openings on the defective compressor. Compressor
manufacturers will void warranties on units received not
properly sealed. Do not distort the manufacturers tube
connections.
WARNING
HIGH TEMPERATURES
Extreme care, proper judgment and all safety
procedures must be followed when testing,
troubleshooting, handling or working around
unit while in operation with high temperature
components. Wear protective safety aids
such as: gloves, clothing etc.
CAUTION
FREEZE HAZARD
Proper safety procedures must be followed,
and proper protective clothing must be worn
when working with liquid refrigerant.
Failure to do so could result in serious burn
injury.
Failure to follow these procedures could
result in minor to moderate injury.
NOTICE
FIRE HAZARD
10. Recharge the system with the correct amount of
refrigerant. The proper refrigerant charge will be
found on the unit rating plate. The use of an accurate
measuring device, such as a charging cylinder,
The use of a torch requires extreme care and proper
judgment. Follow all safety recommended precautions
and protect surrounding areas with fire proof materials.
Have a fire extinguisher readily available. Failure to follow
this notice could result in moderate to serious property
damage.
electronic scales or similar device is necessary.
48
SPECIAL PROCEDURE IN THE CASE OF MOTOR
COMPRESSOR BURNOUT
WARNING
ELECTRIC SHOCK HAZARD
Turn off electric power before service or
installation.
Failure to do so may result in personal injury,
or death.
WARNING
HIGH PRESSURE HAZARD
Sealed Refrigeration System contains refrigerant
and oil under high pressure.
Proper safety procedures must be followed,
and proper protective clothing must be worn
when working with refrigerants.
Failure to follow these procedures could
result in serious injury or death.
WARNING
EXPLOSION HAZARD
The use of nitrogen requires a pressure
regulator. Follow all safety procedures and
wear protective safety clothing etc.
Failure to follow proper safety procedures
result in serious injury or death.
1.
2.
Recover all refrigerant and oil from the system.
Remove compressor, capillary tube and filter drier
from the system.
3.
Flush evaporator condenser and all connecting
tubing with dry nitrogen or equivalent. Use approved
flushing agent to remove all contamination from
system. Inspect suction and discharge line for
carbon deposits. Remove and clean if necessary.
Ensure all acid is neutralized.
4. Reassemble the system, including new drier strainer
and capillary tube.
5. Proceed with step 8-10 on previous page.
ROTARY AND SCROLL COMPRESSOR SPECIAL
TROUBLESHOOTING AND SERVICE
Basically, troubleshooting and servicing rotary compres-
sors is the same as on the reciprocating compressor with
only one main exception:
NEVER, under any circumstances, liquid charge a rotary-
compressor through the LOW side. Doing so would cause
permanent damage to the new compressor.
49
ROUTINE MAINTENANCE
COILS AND BASE PAN
WARNING
The indoor coil (evaporator coil), the outdoor coil
(condenser coil) and base pan should be inspected
periodically (yearly or bi-yearly) and cleaned of all
debris (lint, dirt, leaves, paper, etc.). Clean the coils
and base pan with a soft brush and compressed air
or vacuum. If using a pressure washer, be careful
not to bend the aluminium fin pack. Use a sweeping
up and down motion in the direction of the vertical
aluminum fin pack when pressure cleaning coils.
Cover all electrical components to protect them from
water or spray. Allow the unit to dry thoroughly before
reinstalling it in the sleeve.
ELECTRIC SHOCK HAZARD
Turn off electric power before inspections,
maintenances, or service.
Extreme care must be used, if it becomes
necessary to work on equipment with power
applied.
Failure to do so could result in serious injury
or death.
NOTE: Do not use a caustic coil cleaning agent on coils or base pan.
Use a biodegradable cleaning agent and degreaser. The use
of harsh c leaning materials may lead to deterioration of the
WARNING
EXCESSIVE WEIGHT HAZARD
Use two people to lift or carry the unit, and wear
proper protective clothing.
NOTE: It is extremely important to insure that none of the electrical
and/or electronic parts of the unit get wet. Be sure to cover all
electrical components to protect them from water or spray.
Failure to do so may result in personal injury.
BLOWER WHEEL / HOUSING / CONDENSER FAN /
SHROUD
WARNING
Inspect the indoor blower and its housing, evaporator
blade, condenser fan blade and condenser shroud
periodically (yearly or bi-yearly) and clean of all debris
(lint, dirt, mold, fungus, etc.). Clean the blower housing
area and blower wheel with an antibacterial / antifungal
cleaner. Use a biodegradable cleaning agent and
degreaser on condenser fan and condenser shroud.
Use warm or cold water when rinsing these items.
Allow all items to dry thoroughly before reinstalling
them.
CUT/SEVER HAZARD
Be careful with the sharp edges and corners.
Wear protective clothing and gloves, etc.
Failure to do so could result in serious injury.
NOTICE
Units are to be inspected and serviced by qualified service
personnel only. Use proper protection on surrounding
property. Failure to follow this notice could result in
moderate or serious property damage.
ELECTRONIC / ELECTRICAL / MECHANICAL
Periodically (at least yearly or bi-yearly): inspect
all control components: electronic, electrical and
mechanical, as well as the power supply. Use proper
testing instruments (voltmeter, ohmmeter, ammeter,
wattmeter, etc.) to perform electrical tests. Use an air
conditioning or refrigeration thermometer to check
room, outdoor and coil operating temperatures.
NOTICE
Do not use a caustic coil cleaning agent on coils or base
pan. Use a biodegradable cleaning agent and degreaser,
to prevent damage to the coil and/or base pan.
AIR FILTER
BLOWER/FAN MOTOR
The motor is permanently lubricated.
The air filter should be inspected weekly and cleaned
if needed by vacuuming with a dust attachment or
by cleaning in the sink using warm water and a mild
dishwashing detergent. Dry the filter thoroughly before
reinstalling. Use caution as the coil surface can be sharp.
TO REMOVE, WASH AND REPLACE FILTER
Lower front panel. Use handle on filter to flex filter
up and out of retainer. Remove filter from unit. Clean
filter monthly or more frequently if needed. Refer to
accessories section for filter options.
50
ROUTINE MAINTENANCE (Continued)
NOTICE
Do not drill holes in the bottom of the drain pan or the
underside of the unit. Not following this notice could
result in damage to the unit or condensate water leaking
inappropriately which could cause water damage to
surrounding property.
SLEEVE / DRAIN
Inspect the sleeve and drain system periodically (at least yearly or bi-yearly) and clean of all obstructions and
debris. Clean both areas with an antibacterial and antifungal cleaner. Rinse both items thoroughly with water and
ensure that the drain outlets are operating correctly. Check the sealant around the sleeve and reseal areas as
needed.
DECORATIVE FRONT COVER
Clean the front cover when needed. Use a mild detergent. Wash and rinse with warm water. Allow it to dry
thoroughly before reinstalling it in the chassis.
The decorative front and the cabinet can be cleaned with warm water and a mild liquid detergent. Do NOT use
solvents or hydrocarbon based cleaners such as acetone, naphtha, gasoline, benzene, etc.
Use a damp (not wet) cloth when cleaning the control area to prevent water from entering the unit, and possibly
damaging the electronic control.
CLEARANCES
Inspect the surrounding area (inside and outside) to ensure that the unit’s clearances have not been compromised or
altered.
Accumulator
Outdoor Grille
Discharge Air
Compressor
Fresh Air Vent
Reversing Valve
Evaporator Coil
Condenser Coil
Sleeve
Air Intake Vents
Electronic Control
Board
Control Key Pad
Support Bar
Blower Wheel
Fan Blade
Fan/Blower Motor
Base Pan
Air Intake From
Sides and Bottom
Control Key Pad
(User Interface)
Chassis Pull
Out Handle
51
ROUTINE MAINTENANCE (Continued)
Standard Filter Cleaning Installation Instructions
STEP 2.
3
STEP 1.
NOTE:
Figure 1
Figure 3
FILTER
FILTER
GRIP
Remove the filter by grabbing it from its handle, lifting it up and swinging
it out.
STEP 3.
Swing the front frame open. Clean the front frame by washing
Figure 2
Figure 4
A
FILTER
GRIP
TOP TAB
FRONT
FRAME WITH
STANDARD
MESH FILTER
HANDLE
STEP 4.
STEP 5.
the inside of the front door.
NOTE:
the tab in the frame stops the handle from sliding in, slide the
filter halfway up, tilt it towards the front of you, then gently slide
it up fully. Do not force the handle into the frame.
52
ROUTINE MAINTENANCE (Continued)
Heat pumps operate differently
If your unit is a "Y", or heat pump model, there are some things that you
will want to be aware of. Some functions of a heat pump differ from your
unit when it is used for heating:
After Maintenance/Repair
Start-up Checklist and Notes
‹
‹
‹
‹
Inspect and ensure that all components and accessories have been
installed properly and that they have not been damaged during the
installation progress.
1. It is normal for ice to form on the outdoor coil of the heat pump.
Moisture in the outside air, passing over the coil when very cold,
will form ice.
Check the condensate water drain(s) to ensure that they are adequate
for the removal of condensate water, and that they meet the approval
of the end user.
2. If the outdoor temperature drops below 37° F (3° C), your heat
pump will automatically turn on the electric resistance heat. When
the temperature rises to 40° F (4° C), the compressor will resume
the heat pump operation. If your unit is a 115 volt model (YS10),
it is designed for use in warmer climates and does not have an
electrical heat feature, and will not provide adequate heat below
37° F (2.8° C).
Ensure that all installation instructions concerning clearances around
the unit have been adhered to. Check to ensure that the unit air filter,
indoor coil, and outdoor coil are free from any obstructions.
Ensure that the circuit breaker(s) or fuse(s) and supply circuit wire
size have been sized correctly. If the unit was supplied with a power
supply cord, insure that it is stored properly.
CONTROL PANEL BATTERY CHANGE
PROCEDURE
Remove the grille, by loosening four (4) captive screws (See Figure 1).
Remove one (1) screw on the battery retaining door (See Figure 2). Remove
and replace the battery (CR2450). Reinstall the battery retaining door. Align
the grille guide pins then tighten the four (4) captive screws. Before closing
the grille panel door, check the filter. Clean or replace it as necessary.
‹
‹
‹
‹
Ensure that the entire installation is in compliance with all applicable
national and local codes and ordinances having jurisdiction.
Secure components and accessories, such as a decorative front
cover.
Start the unit and check for proper operation of all components in
each mode of operation.
Instruct the owner or operator of the units operation, and the
manufacturer's Routine Maintenance.
Figure 1
NOTE: A log for recording the dates of maintenance and/or service is
recommended.
‹
Present the owner or operator of the equipment with the name,
address and telephone number of the Authorized Friedrich Warranty
Service Company in the area for future reference if necessary.
NOTE: This is a warm weather appliance
USE HAND TOOLS
DO NOT OVER TIGHTEN
The air conditioner is designed to cool in warm weather when the outside
temperature is above 60° F (15.6° C) and below 115° F (46.1° C), so it won't
cool a room if it is already cool outside. If you want to cool a room in the
spring or fall, select the FAN ONLY mode and set the Fresh Air/Exhaust
air control to Fresh Air. This will bring in a supply of cooler outside air.
Condensation is normal
Air conditioners actually pump the heat and humidity from your room to the
outside. Humidity becomes water, and your air conditioner will use most of
the water to keep the outside coil cool. If there is excessive humidity, there
may be excess water that will drip outside. This is normal operation.
1. USE HAND TOOLS WHEN INSTALLING AND
REMOVING FRONT PANEL.
DO NOT OVERTIGHTEN SCREWS.
2. DISCONNECT POWER AND FOLLOW ALL
LABELED WARNINGS WHEN FRONT PANEL
IS REMOVED.
Frosting
This usually occurs because of insufficient airflow across the coils, a dirty
filter, cool damp weather, or all of these. Set the SYSTEM mode to FAN
ONLY and the frost will disappear. Setting the thermostat a little warmer
will probably prevent the frosting from recurring.
Figure 2
Noises
All air conditioners make some noise. Friedrich units are designed to operate
as quietly as possible. An air conditioner mounted in a wall is quieter than
one mounted in a window. It is important to ensure that the chassis seal
gasket is properly installed (refer to installation instructions).
Battery type: Lithium, 3 Volts, #CR2450
53
Service and Assistance
Before calling for service, please check the “Troubleshooting Tips” section
on pages 40 and 41. This may help you to find the answer to your problem,
avoid unnecessary service calls, and save you the cost of a service call if
the problem is not due to the product itself. If you have checked the “Basic
Troubleshooting” section and still need help, it is available as follows:
You can find the name of your local Authorized Service Provider by visiting
If you require further assistance
You can call the Customer Support Call Center at 1-800-541-6645.
Before calling, please make sure that you have the complete model and
serial number, and date of purchase of your equipment available. By
providing us with this information, we will be better able to assist you.
Our specialists are able to assist you with:
‹
‹
‹
‹
‹
‹
Specifications and Features of our equipment.
Referrals to dealers, and distributors.
Use and Care Information.
Recommended maintenance procedures.
Installation information.
Referrals to Authorized Service Providers and Parts depots.
Available Accessories
DC-2 Drain Kit – Part No. 01900235
In some installations, excess condensate water caused by extremely humid
conditions, may result in an undesirable water drip such as on a patio or
over an entryway. MODEL DC-2 DRAIN KIT (Part No. 01900-235) can be
installed to drain excess condensation to an alternate location.
Carbon Filter Kits
The kits vary depending on the chassis size (small, medium, large). Each
kit contains three (3) filters.
WCFS – Carbon filter kit for small chassis models.
WCFM – Carbon filter kit for medium chassis models.
WCFL – Carbon filter kit for large chassis models.
Remote Wall Thermostats
RT4 – Digital wall thermostat hard wired with single speed fan.
RT5 – Digital wall thermostat hard wired with a digital display, two fan speed
selection, filter check light, temperature limiting, status indicator light, room
temperature offset, backlight and battery backup.
Window Installation Kits (Standard in Kühl
Models without Heat)
KWIKS – For all ES and YS models.
KWIKM – For all EM and YM models.
KWIKL – For all EL and YL models.
54
ROOM AIR CONDITIONER UNIT PERFORMANCE TEST DATA SHEET
JOB NAME________________________________ TECHS NAME____________________________________
DATE: _______________ MODEL:_______________ SERIAL:________________
HOW IS ALL OF THE INSTALLATION?
GOOD BAD
YES
____
____
____
____
____
NO
____
____
____
____
____
IS A C HAS S IS S E AL G AS K E T INT ALLE D ?
IS THE FR E S H/E XAUS T AIR V E NT OP E N?
IS A FR IE DR IC H S LE E VE INS TAL LE D?
IS A FR IE DR IC H OUT DOOR G R IL LE INS T ALLE D?
IS MAINTE NANC E B E ING PE R FOR ME D?
If NO is checked use back of sheet for explanation
E LE C T R IC AL:
LINE VOLTAGE (STATIC)
START UP VOLTAGE
AMPERAGE DRAW
AMPERAGE DRAW
C OMP R E S S OR
--------- VOLTS
-------- VOLTS
--------- AMPS (COOL)
--------- AMPS (HEAT)
LOCKED ROTOR AMPS
AMPERAGE DRAW
--------- AMPS
--------- AMPS
INDOOR TE MP E R AT UR E S :
INDOOR AMBIENT TEMPERATURE
RELATIVE HUMIDITY (RH) INDOOR
-------- F
-------- %
C OOL
---------- F --------- F
---------- F --------- F
HE AT
DISCHARGE AIR TEMPERATURE (INDOOR)
RETURN AIR TEMPERATURE (INDOOR)
OUTDOOR T E MPE R AT UR E :
OUTDOOR AMBIENT TEMPERATURE
RH OUTDOOR
--------- F
--------- %
DISCHARGE AIR TEMPERATURE (OUTDOOR)
INTAKE AIR TEMPERATURE (OUTDOOR)
--------- F ---------- F
--------- F ---------- F
APPLICATION USE ------------------------- ROOM (RESIDENTIAL OR COMMERCIAL)
COOLING OR HEATING AREA W ---------- X L ----------- X H ----------- = SQ/CU/FT ------------
T his is a general guide. pleas e c ons ult manual J or M.
This is a general guide.
Please consult manual J or M for exact load calculations.
55
ERROR CODES AND ALARM STATUS
Maintenance
ICON
Error
Code
Problem
Control Board's Action
Continue to monitor for "OPEN" (Unstuck) switch. Do not process switch
Front Panel Button Stuck For More
Than 20 Seconds
1
Flash
ENSURE FRONT COVER DOES NOT DEPRESS BUTTONS
input.
Input Voltage Out of Specification (103
- 127 / 187 - 253)
Indoor Temperature Sensor is Open or Set temp to 75°F in COOLING or 68°F in HEATING. Unit continues to
2
3
4
Flash
Flash
Flash
Stop.Open all relays until voltage is back within specs. Resume operation
Shorted
operate
Indoor Coil Temperature Sensor is
Open or Shorted
Control Board sets temp to 40°F. Override sensor. Unit Continues to
operate.
Sets temp to 20°F. Override sensor. Continue operation. Use Elec Heat if
available for HEATING. If not available use HEAT PUMP if outdoor temp
allows.
Shut down for 5 min. Resume operation for 3 min. Continues to monitor. If
test fails 3 times, the severity is increased and the unit operation is locked
out.
Outdoor Coil Temperature Sensor is
Open or Shorted
5
6
Flash
Flash
Outdoor Coil > (grater than) 175 F
Indoor Coil < (less than) 30 F for 2
consecutive minutes
Unit Cycles > (grater than) 9 Times per
hour
Unit Cycles < (less than) 3 Times per
Hour
Turn compressor off. Run High Fan speed. When coil temp reachs 45°F
resume operation after lockout time.
7
8
9
Flash
Log Only
Log Only
Continue operation. Continue to monitor. Take no action. Log Only.
Continue operation. Continue to monitor. Take no action. Log Only.
Only used if Electric Heat is available. Run High Speed and Electric heat
until room temp reaches 46°F. Display "FRZ" during operation. Logged
Only
Severity 4 error is. Unit operates based on standard input mapping.
Severity 2 error opens all relays. Unit will not operate.
10
11
12
Log Only
On
Room Freeze Protection
WallStat Problem or Connection Issue
Discharge Air > (greater than) 185 F
Shutdown heat pump and electric heater. Run high fan speed until temp is
100°F. Resume operation. Third occurance in 1 hour locks unit out.
Flash
If unit is cooling or heat pump on,shut down compressor. Run high fan until
switch closes. Resume operation. Third occurance in 1 hour locks unit out.
13
Flash
Prerssure Limit Switch Open
Discharge Air Temperature Sensor is Override Sensor. Set temp to 75°F. Continue to monitor. Set error code 14
14
15
16
17
Flash
Solid On
Flash
Open or Shorted
ON.
If indoor coil temp < (Lesser than) ambient temp for 3 minutes. Unit uses
electric heat to satisfy heating demand.
Heat Pump Error
Ambient temp < (less than) 0°F and ambient temp > (greater than) 130°F.
Set error code 16 ON. When cleared return unit to normal.
Temperature Beyond Operating Limits
Equipment Doesn't Meet Minimum
Configuration
Flash
Must have compressor enabled and at least 2 fan speeds
Unit shuts down. Inputs via front panel or t-stat are ignored. Qualified
Technical Service required URGENT
Unit operates. Qualified Technical Service required
Error is Logged Only. Unit operates. Severity 3 keeps unit running.
Attention is needed
18
19
20
21
22
Flash
Flash
Special Test 1 Severity Level 1
Special Test 2 Severity Level 2
Special Test 3 Severity Level 3
Solid On
OFF, Log Only Special Test 4 Severity Level 4
Error is Logged Only. Unit operates. Severity 4 keeps unit running.
Outdoor Coil Temperature < 30 F for 2 Unit will use electric heat to satisfy heating demands until temp > 45°F.
consecutive Minutes Unit must be a Heat Pump.
OFF, Log Only
OFF, Log Only
Flash
Frost Protection (for Heat Pump Only Unit will run active defrost for a minimum of 6 minutes when Heat Pump
23
24
Unit- YS10M10)
run time is greater than 60 minutes and outdoor coil temp is 26 F or less.
Outdoor Air Temperature Sensor is
Open or Shorted
Continue with normal operation. Continue to monitor sensor.
Key Sequence
Action
Enter Maintenance Menu
Reset Error Codes & Error History Press
Press SYSTEM + SCHEDULE + BACK + DISPLAY/ENTER for 6 secs or until double beep sounds(ꢀ)
for 3 secs or until double beep sounds (ꢀ)
ꢀ
+
ꢁ
56
TROUBLESHOOTING TIPS
NOTE: To more accurately identify the problem, first check for current maintenance
alerts and their history.
Problem
Possible Cause
Possible Solution
Turn the unit to the on position and raise or
lower temperature setting (as appropriate) to
call for operation.
The unit is turned to the off position,
Plug into a properly grounded 3 prong
receptacle. See “Electrical Rating Tables” on
pg. 6 for the proper receptacle type for your
unit.
The LCDI power cord is unplugged.
Press and release RESET (listen for click;
Reset button latches and remains in) to resume
operation.
Unit does not operate.
The LCDI power cord has tripped
(Reset button has popped out).
Reset the circuit breaker, or replace the fuse as
applicable. If the problem continues, contact a
licensed electrician.
The circuit breaker has tripped or
the supply circuit fuse has blown.
There has been a local power
failure.
The unit will resume normal operation once
power has been restored.
Other appliances are being used on
the same circuit.
The unit requires a dedicated outlet circuit, not
shared with other appliances.
Do NOT use an extension cord with this or any
other air conditioner.
An extension cord is being used.
Unit Trips Circuit Breaker or
Blows Fuses.
Replace with a circuit breaker or time-delay
fuse of the proper rating. See “Electrical
Rating Tables” on pg. 6 for the proper circuit
breaker/fuse rating for your unit. If the problem
continues, contact a licensed electrician.
The circuit breaker or time-delay
fuse is not of the proper rating.
The LCDI power cord can trip
(Reset button pops out) due to
disturbances on your power supply
line.
Press and release RESET (listen for click;
Reset button latches and remains in) to resume
normal operation.
LCDI Power Cord Trips (Reset
Button Pops Out).
Once the problem has been determined and
corrected, press and release RESET (listen for
click; Reset button latches and remains in) to
resume normal operation.
Electrical overload, overheating, or
cord pinching can trip (Reset button
pops out) the LCDI power cord.
NOTE: A damaged power supply cord must be replaced with a new power supply cord
obtained from the product manufacturer and must not be repaired.
Ensure that the return and/or discharge air
The return/discharge air grille is
paths are not blocked by curtains, blinds,
blocked.
furniture, etc.
Windows or doors to the outside are
Ensure that all windows and doors are closed.
open.
The temperature is not set at a cool
enough/warm enough setting.
Adjust the Temperature control to a cooler or
warmer setting as necessary.
Unit Does Not Cool/Heat
On And Off Too Frequently.
remove obstruction.
The indoor coil or outdoor coil is
dirty or obstructed.
Clean the coils, (See Routine Maintenance), or
remove obstruction.
Be sure to use exhaust vent fans while cooking
or bathing and, if possible, try not to use heat
producing appliances during the hottest part of
the day.
There is excessive heat or moisture
(cooking, showers, etc.) in the room.
The temperature of the room you
are trying to cool is extremely hot.
Allow additional time for the air conditioner to
cool off a very hot room.
57
TROUBLESHOOTING TIPS (Continued)
Problem
Possible Cause
Possible Solution
Do not try to operate your air conditioner in the
cooling mode when the outside temperature
is below 60° F (16° C). The unit will not cool
properly, and the unit may be damaged.
The outside temperature is below
60° F (16° C).
Since the fan does not circulate the room
air continuously at this setting, the room air
does not mix as well and hot (or cold) spots
may result. Using the continuous fan setting
is recommended to obtain optimum comfort
levels.
The digital control is set to fan
cycling mode.
Unit Does Not Cool/Heat
On And Off Too Frequently
(continued).
Check the cooling capacity of your unit to
ensure it is properly sized for the room in which
it is installed. Room air conditioners are not
designed to cool multiple rooms.
cooling capacity to match the heat
gain of the room.
Check the heating capacity of your unit. Air
conditioners are sized to meet the cooling load,
and heater size is then selected to meet the
heating load. In extreme northern climates,
room air conditioners may not be able to be
used as a primary source of heat.
heating capacity to match the heat
loss of the room.
If there are heat producing appliances in use
in the room, or if the room is heavily occupied,
the unit will need to run longer to remove the
additional heat.
This may be due to an excessive
heat load in the room.
Be sure to use exhaust vent fans while cooking
or bathing and, if possible, try not to use heat
producing appliances during the hottest part of
the day.
It may also be due to an improperly
sized unit.
your new air conditioner may result in the
unit running longer than you feel it should.
This may be more apparent, if it replaced an
This may be normal for higher
Unit Runs Too Much.
compared to older models.
You may notice that the discharge
air temperature of your new air
conditioner may not seem as cold
as you may be accustomed to from
older units. This does not, however,
indicate a reduction in the cooling
capacity of the unit.
capacity rating (Btu/h) listed on the unit’s rating
58
COOLING ONLY ROOM AIR CONDITIONERS: TROUBLESHOOTING TIPS
Possible Solution
Problem
Possible Cause
Low voltage
Check voltage at compressor. 115V & 230V
units will operate at 10% voltage variance
Temperature not set cold enough or Set temperature to lower than ambient position.
room air thermistor inoperative
Test thermistor and replace if inoperative.
Compressor hums but cuts off on
overload
Hard start compressor. Direct test compressor.
If compressor starts, add starting components
Compressor
does not run
Open or shorted compressor
windings
Check for continuity & resistance
Open overload
Test overload protector & replace if inoperative
Test capacitor & replace if inoperative
Test for continuity in all positions. Replace if
inoperative switch or electronic board.
Refer to appropriate wiring diagrams to check
wiring. Correct as needed.
Open capacitor
Inoperative system button
Broken, loose or incorrect wiring
Possible Solution
Problem
Possible Cause
Inoperative system button
Broken, loose or incorrect wiring
Open capacitor
Test button & replace user interface if inoperative
Refer to applicable wiring diagram
Fan motor
Test capacitor & replace if inoperative
Replace user interface if inoperative
does not run
Fan speed button defective
Test fan motor & replace if inoperative (be sure
internal overload has had time to reset)
Inoperative fan motor
Problem
Possible Cause
Possible Solution
Undersized unit
Refer to industry standard sizing chart
Indoor ambient thermistor open
or shorted
See alarms and replace thermistor if needed.
Dirty filter
Clean as recommended in Owner’s Manual
Use pressure wash or biodegradable cleaning
agent to clean
Dirty or restricted condenser or
evaporator coil
Does not cool or
only cools slightly
Poor air circulation
Adjust discharge louvers. Use high fan speed
Close doors. Instruct customer on use of this
feature
Fresh air or exhaust air door open
Low capacity - undercharge
Check for leak & make repair
Check amperage draw against nameplate. If
not conclusive, make pressure test
Compressor not pumping properly
59
COOLING ONLY ROOM AIR CONDITIONERS: TROUBLESHOOTING TIPS
Problem
Possible Cause
Possible Solution
Replace fuse, reset breaker. If repeats, check
fuse or breaker size. Check for shorts in unit
wiring & components
Fuse blown or circuit tripped
Power cord not plugged in
Plug it in
System button in “OFF” position
Set correctly
Unit does not run
Inoperative system button or open
electronic control board
Test for continuity. Check alarms. Correct
as needed.
Loose or disconnected wiring
Check wiring & connections. Reconnect per
wiring diagram
control board or other components
Problem
Possible Cause
Possible Solution
Clean as recommended in Owner’s Manual
Check for dirty or obstructed coil. Use
pressure wash or biodegradable cleaning
agent to clean
Dirty filter
Restricted airflow
Inoperative thermistor
Short of refrigerant
Check alarms. Replace as necessary.
De-ice coil & check for leak
Evaporator coil
freezes up
Inoperative fan motor
Partially restricted capillary tube
Test fan motor & replace if inoperative
De-ice coil. Replace capillary tube.
Possible Solution
Problem
Possible Cause
Unit undersized. Test cooling performance &
replace with larger unit if needed. See sizing chart.
Check for partially iced coil & check
temperature split across coil
Excessive heat load
Restriction in line
Refrigerant leak
Compressor runs
continually & does
not cycle off
Find leak and repair.
Check operation of t-stat. Replace if contacts
remain closed.
Compressor relay contacts stuck
Remote wall T-stat incorrectly wired Refer to appropriate wiring diagram
Thermistor shorted
Replace thermistor or electronic control board
Problem
Possible Cause
Possible Solution
Compressor relay contacts stuck
Temperature set at coldest point
Incorrect wiring
Replace electronic control board
Turn to higher temp. setting to see if unit
cycles off. If not, replace control board.
Electronic control
board does not
turn unit off
Refer to appropriate wiring diagrams
Refer to industry standard sizing chart
Replace thermistor or electronic control board
Unit undersized for area to be
cooled
Defective thermistor
60
COOLING ONLY ROOM AIR CONDITIONERS: TROUBLESHOOTING TIPS
Problem
Possible Cause
Overload inoperative. Opens too
soon
Possible Solution
Check operation of unit. Replace overload if
system operation is satisfactory
Compressor restarted before
system pressures equalized
Control’s default of 3 minutes wait delay timer
inoperative. Replace board.
Check voltage with unit operating. Check for
other appliances on circuit. Air conditioner
should be in a dedicated circuit for proper
voltage & fused separately
Compressor runs
for short periods
only. Cycles on
overload
Low or fluctuating voltage
Incorrect wiring
Refer to appropriate wiring diagram
Shorted or incorrect capacitor
Test capacitor and replace if needed.
Restricted or low air flow through
condenser coil or evaporator coil
Check for proper fan speed or blocked
coils. Correct as needed.
Check for kinked discharge line or restricted
Compressor running abnormally
hot
condenser. Refrigerant overcharge. Check
amperage, connections.
Problem
Possible Cause
Possible Solution
Check power supply. Check LCDI plug. Check
wire connections. Check if panel is locked.
No power
Unit does not
turn on
Incorrect wiring
Refer to appropriate wiring diagram
Defective thermistor
Replace thermistor or electronic control board
Problem
Possible Cause
Poorly installed
Possible Solution
Refer to Installation Manual for proper
installation
Fan blade striking chassis
Reposition - adjust motor mount
Check that compressor grommets have not
deteriorated. Check that compressor mounting
parts are not missing
Noisy operation
Compressor vibrating
Improperly mounted or loose
cabinet parts refrigerant tubes
Check assembly & parts for looseness,
rubbing & rattling pipes, etc.
Problem
Possible Cause
Possible Solution
Evaporator drain pan overflowing
Clean obstructed drain trough
Evaporator drain pan broken or cracked.
Reseal or replace. No chassis gasket installed.
Install chassis gasket
Condensation forming underneath
base pan
Poor installation resulting in rain
entering the room
Check installation instructions. Reseal as
required
Water leaks into
the room
Dirty evaporator coil. Use pressure wash
or biodegradable cleaning agent to clean.
Environmental phenomena: point supply
louvers upward. Put on high fan.
Condensation on discharge grille
louvers
Chassis gasket not installed
Downward slope of unit is too
steep inward
Install gasket, per Installation manual
Refer to installation manual for proper
installation
61
COOLING ONLY ROOM AIR CONDITIONERS: TROUBLESHOOTING TIPS
Problem
Possible Cause
Sublimation:
Possible Solution
Ensure that foam gaskets are installed in
between window panes & in between the
unit & the sleeve. Also, ensure that fresh
air/exhaust vents (on applicable models) are in
the closed position & are in tact
When unconditioned saturated,
outside air mixes with conditioned
air, condensation forms on the
cooler surfaces
Water “spitting”
into room
Follow installation instructions to ensure that
downward pitch of installed unit is no less than
1/4” & no more than 3/8”
Downward pitch of installation is
too steep towards back of unit
Clean & advise customer of periodic cleaning
& maintenance needs of entire unit
Restricted coil or dirty filter
Problem
Possible Cause
Insufficient air circulation thru area
to be air conditioned
Possible Solution
Adjust louvers for best possible air circulation
Operate in “MoneySaver” position
Advise customer
Excessive
moisture
Oversized unit
Inadequate vapor barrier in building
structure, particularly floors
Problem
Possible Cause
Defective thermistor
Unit oversized
Possible Solution
Replace thermistor or electronic control board
See sizing chart. Correct as needed.
Unit
Chassis seal gasket not sealing or
absent causting unit to short cycle
Check gasket. Reposition or replace as
needed
short cycles
Clean & advise customer of periodic cleaning
& maintenance needs of entire unit
Restricted coil or dirty filter
Problem
Possible Cause
Possible Solution
Defective indoor ambient thermistor
or electronic control board
Check alarms. Replace thermistor or electronic
control board
Prolonged off
cycles
Defective remote wall t-stat
Replace t-stat
Problem
Possible Cause
Evaporator drain pan cracked or
obstructed
Possible Solution
Repair, clean or replace as required
Detach shroud from pan & coil. Clean &
remove old sealer. Reseal, reinstall & check
Use pressure wash or biodegradable cleaning
agent to clean
Water in compressor area
Obstructed condenser coil
Outside water
leaks
Fan blade/slinger ring improperly
positioned
Adjust fan blade to 1/2” of condenser coil fin
pack
62
HEAT / COOL ONLY ROOM AIR CONDITIONERS: TROUBLESHOOTING TIPS
Problem
Possible Cause
Possible Solution
Bad indoor ambient thermistor
Check error codes. Replace as needed.
Room temperature
uneven
(Heating cycle)
Fan speed too low
Set at higher fan speed.
Close doors, windows, etc.
Enable ATSF
Opened door, windows, etc.
ATSF (room air sampling feature) disabled
Problem
Possible Cause
Possible Solution
Bad outdoor coil thermistor
Replace thermistor.
Unit will not defrost
• On heat pumps with electric heat: no action needed
• On model YSM10: do not operate below 32°F/ 0°C
(Heat pump
only models)
• If outdoor air temp is higher than freezing, check
reversing valve, electric coil, outdoor thermistor,
refrigerant circuits, etc.
Temperature below 32°F/ 0°C
• For proper operation: correct as needed
Problem
Possible Cause
Exhaust or fresh air door open
Dirty filter
Possible Solution
Check if operating properly. Instruct customer on
proper use of control
Clean as recommended in Owner's Manual
Check heat rise across coil. If unit operates
efficiently, check if insulation can be added
to attic or walls. If insulation is adequate,
recommend additional unit or larger one
Unit undersized
Does not heat
adequately
Outdoor coil thermistor or electronic control
board defective
Check alarms (error codes). Replace thermistor
or electronic control board.
Check for adequate fan air across heater. Check
for open hi-limit control.
Heater hi-limit control cycling on & off
Shorted or open supplementary heater
Incorrect wiring
Do ohmmeter check.
Check applicable wiring diagram
63
HEAT PUMP ROOM AIR CONDITIONERS: TROUBLE SHOOTING TIPS
Problem
Possible Cause
Incorrect wiring
Action
Refer to applicable wiring diagram
Check for continuity of coil
Defective solenoid coil
Reversing valve fails to shift
Inoperative system switch
Possible Cause
Block condenser coil & switch unit to cooling.
Allow pressure to build up in system, then
switch to heating. If valve fails to shift, replace
valve.
Unit cools when
heat is called for
Check for continuity of system switch
Problem
Action
Heating capillary tube partially
restricted
Check for partially starved outer coil. Replace
heating capillary tube
Switch unit several times from heating to
cooling. Check temperature rise across
coil. Refer to specification sheet for correct
temperature rise
Cooling adequate,
but heating
Check valve leaking internally
insufficient
Denergize solenoid coil, raise head pressure,
energize solenoid to break loose. If valve fails
to make complete shift, replace valve.
Reversing valve failing to shift
completely; bypassing hot gas
TROUBLESHOOTING CHART - HEAT PUMP
REFRIGERANT SYSTEM DIAGNOSIS - COOLING CYCLE
LOW SUCTION PRESSURE
HIGH SUCTION PRESSURE
LOW HEAD PRESSURE
HIGH HEAD PRESSURE
Low Load Conditions
High Load Conditions
Low Load Conditions
High Load Conditions
Low Air Flow Across
Indoor Coil
High Air Flow Across
Indoor Coil
Refrigerant System
Restriction
Low Air Flow Across
Outdoor Coil
Refrigerant System
Restriction
Reversing Valve not
Fully Seated
Reversing Valve not
Fully Seated
Overcharged
Undercharged
Overcharged
Undercharged
in System
Noncondensables (air)
Moisture in System
Defective Compressor
Defective Compressor
64
HEAT PUMP ROOM AIR CONDITIONERS: TROUBLE SHOOTING TIPS
REFRIGERANT SYSTEM DIAGNOSIS - HEATING CYCLE
HIGH SUCTION PRESSURE
HIGH HEAD PRESSURE
LOW SUCTION PRESSURE
LOW HEAD PRESSURE
Low Airflow
Across Outdoor Coil
Outdoor Ambient Too High
for Operation in Heating
Refrigerant System
Restriction
Outdoor Ambient Too High
For Operation In Heating
Refrigerant System
Restriction
Reversing Valve not
Fully Seated
Reversing Valve not
Fully Seated
Low Airflow Across
Indoor Coil
Undercharged
Overcharged
Undercharged
Overcharged
Noncondensables (air)
in System
Moisture in System
Defective Compressor
Defective Compressor
ELECTRICAL TROUBLESHOOTING CHART - HEAT PUMP
HEAT PUMP
SYSTEM COOLS WHEN
HEATING IS DESIRED.
Is the Selector Switch
Set for Heat?
Is Line Voltage
Present at the Solenoid
YES
NO
NO
Is the Solenoid Coil Good?
Replace the Solenoid Coil
YES
Reversing Valve Stuck
Replace the Reversing Valve
65
TROUBLESHOOTING TOUCH TEST CHART: TO SERVICE REVERSING VALVES
NORMAL FUNCTION OF VALVE
NOTES:
VALVE
OPERATING
CONDITION
ꢀꢀ
ꢀꢀ ꢀꢀ
ꢀꢀ ꢀꢀ
ꢀꢀ
* TEMPERATURE OF VALVE BODY
** WARMER THAN VALVE BODY
1
2
3
4
5
6
POSSIBLE CAUSES
CORRECTIONS
ꢀꢀ
Cool
as (2)
Hot
as (1)
Hot
Cool
*TVB
TVB
Normal Cooling
ꢀꢀ
ꢀꢀ
ꢀꢀ
ꢀꢀ
Hot
as (1)
Cool
as (2)
Hot
Cool
*TVB
TVB
Normal Heating
MALFUNCTION OF VALVE
No voltage to coil.
Repair electrical circuit.
Check Electrical circuit and coil
Check refrigeration charge
Defective coil.
Replace coil.
Low charge.
Repair leak, recharge system.
Recheck system.
Pressure differential too high.
Deenergize solenoid, raise head pressure,
reenergize solenoid to break dirt loose.
If unsuccessful, remove valve, wash
out. Check on air before installing. If no
movement, replace valve, add strainer to
discharge tube, mount valve horizontally.
Valve will not
shift from cool
to heat.
Cool,
as (2)
Hot,
as (1)
Hot
Cool
*TVB
Hot
Pilot valve okay. Dirt in one bleeder hole.
Stop unit. After pressures equalize, restart
with solenoid energized. If valve shifts,
reattempt with compressor running. If still
no shift, replace valve.
Piston cup leak
ꢀꢀ
ꢀꢀ ꢀꢀ
ꢀꢀ ꢀꢀ
ꢀꢀ
Cool,
as (2)
Hot,
as (1)
Raise head pressure, operate solenoid to
free. If still no shift, replace valve.
Hot
Cool
*TVB
*TVB
Clogged pilot tubes.
Raise head pressure, operate solenoid
to free
partially clogged port. If still no shift,
replace
valve.
Valve will not
shift from cool
to heat.
Cool,
as (2)
Hot,
as (1)
Both ports of pilot open. (Back seat port
did not close).
Hot
Cool
Hot
Hot
Cool,
as (2)
Hot,
as (1)
Warm
Hot
Cool
*TVB
*TVB
Warm
Hot
Defective Compressor.
Replace compressor
Not enough pressure differential at start
of stroke or not enough fl ow to maintain and charge. Raise head pressure. If no
Check unit for correct operating pressures
Warm
Warm
Hot
pressure differential.
shift, use valve with smaller port.
Body damage.
Replace valve
ꢀꢀ
ꢀꢀ ꢀꢀ
ꢀꢀ ꢀꢀ
ꢀꢀ
Starts to shift
but does not
complete
Raise head pressure, operate solenoid. If
no shift, use valve with smaller ports.
Hot
Warm
Warm
Hot
Hot
Hot
Both ports of pilot open.
Body damage.
Hot
Hot
Hot
Hot
*TVB
Hot
Replace valve
Valve hung up at mid-stroke. Pumping
volume of compressor not suffi cient to
maintain reversal.
reversal.
Raise head pressure, operate solenoid. If
no shift, use valve with smaller ports.
ꢀꢀ
ꢀꢀ ꢀꢀ
ꢀꢀ ꢀꢀ
ꢀꢀ
Raise head pressure, operate solenoid.
Hot
Hot
Hot
Hot
Hot
Hot
Both ports of pilot open.
If no
shift, replace valve.
Hot,
as (1)
Cool,
as (2)
Operate valve several times, then recheck.
If excessive leak, replace valve.
Apparent
leap in heat-
ing.
Hot
Hot
Hot
Cool
Cool
Cool
*TVB
**WVB
*TVB
*TVB
**WVB
*TVB
Piston needle on end of slide leaking.
Pilot needle and piston needle leaking.
Pressure differential too high.
Clogged pilot tube.
Hot,
as (1)
Cool,
as (2)
Operate valve several times, then recheck.
If excessive leak, replace valve.
Hot,
as (1)
Cool,
as (2)
Stop unit. Will reverse during equalization
period. Recheck system
Raise head pressure, operate solenoid to
free dirt. If still no shift, replace valve.
ꢀꢀ
ꢀꢀ ꢀꢀ
ꢀꢀ ꢀꢀ
ꢀꢀ
Raise head pressure, operate solenoid.
Remove valve and wash out. Check on air
before reinstalling, if no movement, replace
valve. Add strainer to discharge tube.
Mount valve horizontally.
Hot,
as (1)
Cool,
as (2)
Hot
Cool
Hot
*TVB
Dirt in bleeder hole.
Piston cup leak.
Will not shift
from heat to
cool.
Stop unit. After pressures equalize, restart
with solenoid deenergized. If valve shifts,
reattempt with compressor running. If it
still will not reverse while running, replace
the valve.
Hot,
as (1)
Cool,
as (2)
Hot
Cool
Hot
*TVB
1
Hot,
as (1)
Cool,
as (2)
Hot
Cool
Cool
Hot
Hot
Defective pilot.
Replace valve.
Warm,
as (1)
Cool,
as (2)
Warm
Warm
*TVB
Defective compressor.
Replace compressor
66
ELECTRONIC CONTROL BOARD COMPONENTS IDENTIFICATION
Front
Back
Reversing Valve
Battery Compartment
Max Speed
High Speed
Med Speed
Low Speed
DISCHARGE
Transformer
115/230 Volts
User Interface
connector
T-stat Terminals
Transformer voltage
Selector Switch
115/230 Volts
Sample board for Kuhl+ unit
67
REMOTE WALL THERMOSTAT WIRING DIAGRAMS
LEGEND FOR T-STAT WIRING HARNESS
C
Common Terminal
Call for High Fan
Call for Low Fan
Reversing Valve
Coil for Cooling
Call for Heat
GH
GL
B
Y
W
R
24 VAC Power From Unit
RT5 - Two Speeds Fan T-Stat - Field Provided
-- -- -- Field Wiring
COOL W/O ELECTRIC HEAT
COOL WITH ELECTRIC HEAT
Electronic Control Board
24 VAC Connections
Electronic Control Board
24 VAC Connections
Y
R
Y
R
W
GL
W
C
GH GL
B
C
GH
B
Jumper
Wire
Jumper
Wire
GH GL
O
B
Y
W
RC RH
C
GH GL
O
B
Y
W
RC RH
C
RT5 Thermostat
RT5 Thermostat
HEAT PUMP ONLY AND
HEAT PUMP WITH ELECTRIC HEAT
Electronic Control Board
24 VAC Connections
Y
R
W
C
GH GL
B
Jumper
Wire
GH GL
O
B
Y
W
RC RH
C
68
KUHL
ELECTRONIC CONTROL
COOL ONLY MODELS
SS08M10A, SS10M10A, SS12M10A, SS14M10A
SS12M30A, SS15M30A
SM18M30A, SM21M30A, SM24M30A
WIRING DIAGRAM
COMPRESSOR
UI HOLDER ELECTRONICS ASY
OLP
OD AIR SENSOR
OD COIL SENSOR
ID COIL SENSOR
F4
BLACK
BLUE
RELAY
F3
RELAY
ORANGE
RED
F2
RELAY
F1
RELAY
DCHRG
AIR
SENSOR
TO
DISPLAY
L2 or ACN
AMBIENT
AIR SENSOR
COMP
RELAY
BLACK
L1
BLACK
WHITE
WHITE
SUPPLY CORD
WHITE
CAPACITOR
COM
BROWN
RED
CAPACITOR
BRACKET
TO CAPACITOR
BRACKET
GREEN
MOTOR
TO CHASSIS
BLUE
TO INNERWALL/
MOTOR MOUNT
SCHEMATIC
(115 V)
NEUTRAL
USER I
NTERFACE
MAX
L2 (230/208 V)
4
F4
L1
R
HIGH
3
F3
F2
OLP
FAN MTR
MEDIUM
LOW
FAN
COM
2
1
S
CAP
F1
L2 OR N
COMP
R
OLP
COMPRESSOR
C
COMPRESSOR
5
L1
HERM
S
COM
ELECTRONIC CONTROL
CAP
L E G E N D
T
CAP
- CAPACITOR
- THERMISTER
COMPR - COMPRESSOR
- COMBINATION TERMINAL
- GROUNDED LEAD SYMBOL
- INSULATOR
- FAN MOTOR
MTR
OLP
UI
- OVERLOAD PROTECTOR
- USER INTERFACE
- THERMAL FUSE
TF
HTR
- HEATER ELEMENT
HL
- HEATER LIMIT FUSE
PART NO.
92170000
REV.
04
69
KUHL
ELECTRONIC CONTROL
COOL ONLY MODELS
SL28M30A, SL36M30A
COMPRESSOR
OLP
WIRING DIAGRAM
UI HOLDER ELECTRONICS ASY
OD AIR SENSOR
OD COIL SENSOR
ID COIL SENSOR
F4
RELAY
F3
RELAY
BLACK
BLUE
RED
F2
RELAY
F1
RELAY
DCHRG
AIR
SENSOR
TO
DISPLAY
SOLID STATE RELAY
WHITE
L2 or ACN
BLACK
2
4
AMBIENT
AIR SENSOR
SSR
BLUE
1
3
COMP
RELAY
BLACK
L1
BLACK
WHITE
WHITE
SUPPLY CORD
WHITE
CAPACITOR
COM
BROWN
RED
CAPACITOR
BRACKET
TO CAPACITOR
BRACKET
GREEN
TO CHASSIS
BLUE
MOTOR
TO INNERWALL/
MOTOR MOUNT
SCHEMATIC
(115 V)
NEUTRAL
USER INT
ERFAC
E
L2
(230/208 V)
4
L1
R
HIGH
3
F3
OLP
FAN MTR
MEDIUM
LOW
COM
2
1
F2
F1
FAN
S
CAP
L2 OR N
COMP
R
OLP
COMPRESSOR
C
COMPRESSOR
5
L1
HERM
S
COM
ELECTRONIC CONTROL
CAP
L E G E N D
T
CAP
- CAPACITOR
- THERMISTER
COMPR - COMPRESSOR
- COMBINATION TERMINAL
MTR
OLP
UI
- FAN MOTOR
- GROUNDED LEAD SYMBOL
- INSULATOR
- OVERLOAD PROTECTOR
- USER INTERFACE
- THERMAL FUSE
TF
HTR
- HEATER ELEMENT
HL
- HEATER LIMIT FUSE
PART NO.
92170001
REV.
04
70
KUHL+
ELECTRONIC CONTROL
COOL WITH ELECTRIC HEAT MODELS
ES12M33A, ES15M33A
EM18M34A, EM24M34A
WIRING DIAGRAM
COMPRESSOR
UI HOLDER ELECTRONICS ASY
OLP
OD AIR SENSOR
OD COIL SENSOR
RV
RELAY
ID COIL SENSOR
FAN
4
RELAY
FAN 3
RELAY
BLACK
BLUE
FAN 2
RELAY
HEATER
ORANGE
RED
ORANGE
FAN 1
RELAY
HEAT
RELAY
DCHRG
AIR
TO
DISPLAY
SENSOR
L2 or ACN
HEAT
RELAY
BLACK
AMBIENT
AIR SENSOR
COMP
RELAY
L1
BLACK
WHITE
WHITE
SUPPLY CORD
RED
WHITE
CAPACITOR
COM
BROWN
RED
CAPACITOR
BRACKET
TO CAPACITOR
BRACKET
GREEN
MOTOR
TO CHASSIS
BLUE
TO INNERWALL/
MOTOR MOUNT
SCHEMATIC
USER INT
ERFAC
E
HIGH
L2
(230/208 V)
3
F3
F2
F1
L1
R
MEDIUM
LOW
2
OLP
FAN MTR
COM
FAN
1
S
ELECTRIC HEAT
CAP
HL
TF
6
7
HTR
EH1
EH2
ELECTRIC HEAT
L2 OR N
COMP
R
OLP
COMPRESSOR
C
COMPRESSOR
5
L1
COM
HERM
S
CAP
ELECTRONIC CONTROL
L E G E N D
T
CAP
- CAPACITOR
- THERMISTER
COMPR - COMPRESSOR
- COMBINATION TERMINAL
- GROUNDED LEAD SYMBOL
- INSULATOR
MTR
OLP
UI
- FAN MOTOR
- OVERLOAD PROTECTOR
- USER INTERFACE
- THERMAL FUSE
TF
HTR
- HEATER ELEMENT
HL
- HEATER LIMIT FUSE
PART NO.
92170002
REV.
04
71
KUHL+
ELECTRONIC CONTROL
COOL WITH ELECTRIC HEAT MODEL
EL36M35A
WIR ING DIAG R AM
UI HOLDE R E LE C TR ONIC S AS Y
C OMP R E S S OR
OLP
O UTDO OR AIR
S
E
NS OR
R V
R E LAY
OUT DOOR C OIL S E NS OR
INDOOR C OIL NS OR
S
E
S OLID S TATE R E LAY
S S R
F AN
R E LAY
4
F AN
R E LAY
3
BLAC K
BLUE
R E D
HE ATE R
F AN
R E LAY
2
OR ANG E
R E D
F AN
R E LAY
1
HE AT
R E LAY
DS C HR G
AIR
S E NS OR
T O
DIS P LAY
R E D
L2 or AC N
HE AT
R E LAY
S OLID S TATE R E LAY
WHITE
BLUE
BLAC K
AMB IE NT
AIR S E NS OR
C OMP
R E LAY
S S R
B LUE
B LAC K
L1
BLAC K
WHIT E
BLAC K
WHIT E
S UP P LY C OR D
WHITE
C AP AC ITOR
C OM
BR OWN
R E D
C AP AC ITOR
BR AC KE T
TO C AP AC ITOR
BR AC KE T
G R E E N
MOTOR
T O C HAS S IS
BLUE
TO INNE R WALL/
MOT OR MOUNT
S C HE MATIC
(115 V)
NE UTR AL
US E R
INTE R FAC E
HIG H
L2 (230/208 V)
3
F3
F 2
F1
L1
R
ME DIUM
LOW
2
FAN MTR
C OM
C AP
FAN
1
S
E LE C T R IC HE AT
HL
TF
6
HTR
E H1
E LE C T R IC HE AT
L2
R
C OMP R E S S OR
OLP
C OMP R E S S OR
C
5
L1
C OMP
C OM
HE R M
S
C AP
L E G E N D
T
- THE R MIS TE R
- C OMBINATION TE R MINAL
C AP
- C AP AC ITOR
C OMP R - C OMP R E S S OR
MTR
OLP
UI
- F AN MOTOR
- GR OUNDE D LE AD S Y MB OL
- INS ULATOR
- OVE R LOAD PR OTE C TOR
- US E R INTE R FAC E
- THE R MAL FUS E
TF
HTR
- HE ATE R E LE ME NT
HL
- HE ATE R LIMIT F US E
P AR T NO.
92170007
R E V.
00
72
KUHL+
ELECTRONIC CONTROL
HEAT PUMP ONLY MODEL
YS10M10A
WIRING DIAGRAM
COMPRESSOR
OLP
UI HOLDER ELECTRONICS ASY
COIL, SOLENOID
OD AIR SENSOR
OD COIL SENSOR
ID COIL SENSOR
RV
RELAY
BLACK
F4
RELAY
F3
RELAY
BLACK
BLUE
F2
RELAY
ORANGE
F1
RELAY
DCHRG
AIR
SENSOR
HEAT
RELAY
TO
DISPLAY
L2 or ACN
HEAT
RELAY
BLACK
AMBIENT
AIR SENSOR
COMP
RELAY
L1
BLACK
WHITE
WHITE
SUPPLY CORD
RED
WHITE
CAPACITOR
COM
BROWN
RED
CAPACITOR
BRACKET
TO CAPACITOR
BRACKET
GREEN
MOTOR
TO CHASSIS
BLUE
TO INNERWALL/
MOTOR MOUNT
SCHEMATIC
NEUTRAL (115 V)
(230/208 V)
USER I
NTERFACE
HIGH
L2
3
F3
F2
F1
L1
R
MEDIUM
LOW
2
OLP
FAN MTR
COM
FAN
1
S
CAP
RV
REVERSE CYCLE
6
HP
L2 OR N
COMP
R
OLP
COMPRESSOR
C
COMPRESSOR
5
L1
COM
HERM
S
ELECTRONIC CONTROL
CAP
L E G E N D
- REVERSING VALVE
- THERMISTER
CAP
- CAPACITOR
- COMPRESSOR
- FAN MOTOR
- OVERLOAD PROTECTOR
- USER INTERFACE
- THERMAL FUSE
T
COMPR
MTR
OLP
UI
- COMBINATION TERMINAL
- GROUNDED LEAD SYMBOL
- INSULATOR
TF
HL
- HEATER LIMIT FUSE
HTR
- HEATER ELEMENT
PART NO.
92170003
REV.
04
73
KUHL+
ELECTRONIC CONTROL
HEAT PUMP WITH ELECTRIC HEAT MODELS
YS12M33A, YM18M34A
WIRING DIAGRAM
COMPRESSOR
UI HOLDER ELECTRONICS ASY
COIL, SOLENOID
OLP
OD AIR SENSOR
OD COIL SENSOR
RV
RELAY
BLACK
ID COIL SENSOR
FAN
4
RELAY
FAN 3
RELAY
BLACK
BLUE
HEATER
FAN
RELAY
2
ORANGE
RED
ORANGE
FAN 1
RELAY
HEAT
RELAY
DCHRG
AIR
TO
DISPLAY
SENSOR
L2 or ACN
HEAT
RELAY
BLACK
AMBIENT
AIR SENSOR
COMP
RELAY
L1
BLACK
WHITE
WHITE
SUPPLY CORD
RED
WHITE
CAPACITOR
COM
BROWN
RED
CAPACITOR
BRACKET
TO CAPACITOR
BRACKET
GREEN
MOTOR
TO CHASSIS
BLUE
TO INNERWALL/
MOTOR MOUNT
SCHEMATIC
NEUTRAL (115 V)
(230/208 V)
USER
INTERFA
CE
L2
HIGH
3
F3
F2
F1
L1
R
MEDIUM
LOW
2
OLP
FAN MTR
S
COM
FAN
1
CAP
ELECTRIC HEAT
HL
6
7
TF
HTR
EH1
EH2
ELECTRIC HEAT
L2
RV
REVERSING CYCLE
COMPRESSOR
OLP
R
8
5
RV
C
COMPRESSOR
L1
COMP
COM
HERM
S
ELECTRONIC CONTROL
CAP
L E G E N D
- REVERSING VALVE
- THERMISTER
CAP
- CAPACITOR
T
COMPR - COMPRESSOR
MTR
OLP
UI
- FAN MOTOR
- COMBINATION TERMINAL
- GROUNDED LEAD SYMBOL
- INSULATOR
- OVERLOAD PROTECTOR
- USER INTERFACE
- THERMAL FUSE
TF
HL
- HEATER LIMIT FUSE
HTR
- HEATER ELEMENT
PART NO.
92170004
REV.
04
74
KUHL+
ELECTRONIC CONTROL
HEAT PUMP WITH ELECTRIC HEAT MODEL
YL24M35A
WIRING DIAGRAM
COMPRESSOR
UI HOLDER ELECTRONICS ASY
OLP
OUTDOOR AIR SENSOR
RV
RELAY
OUTDOOR COIL SENSOR
INDOOR COIL SENSOR
SOLID STATE RELAY
FAN 4
RELAY
4
2
SSR
FAN 3
RELAY
BLACK
BLUE
RED
1
3
HEATER
FAN 2
RELAY
ORANGE
FAN 1
RED
RELAY
DSCHRG
AIR
SENSOR
HEAT
RELAY
TO
DISPLAY
RED
L2 or ACN
HEAT
RELAY
SOLID STATE RELAY
WHITE
BLUE
BLACK
AMBIENT
4
2
AIR SENSOR
COMP
RELAY
SSR
YELLOW
BLACK
1
3
L1
BLACK
WHITE
BLACK
WHITE
SUPPLY CORD
WHITE
CAPACITOR
COM
BROWN
RED
CAPACITOR
BRACKET
TO CAPACITOR
BRACKET
GREEN
MOTOR
TO CHASSIS
BLUE
TO INNERWALL/
MOTOR MOUNT
SCHEMATIC
(115 V)
NEUTRAL
USER
INTERFA
CE
HIGH
L2
(230/208 V)
3
F3
F2
F1
L1
R
MEDIUM
LOW
2
FAN MTR
COM
FAN
1
S
CAP
ELECTRIC HEAT
HL
TF
6
HTR
EH1
ELECTRIC HEAT
L2
RV
REVERSING CYCLE
COMPRESSOR
R
7
5
OLP
RV
C
COMPRESSOR
L1
COMP
COM
HERM
ELECTRONIC CONTROL
S
CAP
SWITCH LOGIC X = CLOSED
O = OPEN
CIRCUIT
L E G E N D
SWITCH POSITION
T
- THERMISTER
CAP
- CAPACITOR
1
2
3
4
5
6
7
COMPR - COMPRESSOR
O
O
O
X
O
0
X
O
O
X
O
O
X
O
O
X
O
O
X
O
O
X
O
O
X
O
O
X
O
O
X
O
O
X
O
O
X
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
X
X
X
X
X
X
O
O
O
O
O
O
O
O
O
O
O
O
O
X
O
O
O
O
X
OFF
HI COOL
- COMBINATION TERMINAL
- GROUNDED LEAD SYMBOL
- INSULATOR
- FAN MOTOR
MTR
OLP
UI
- OVERLOAD PROTECTOR
- USER INTERFACE
- THERMAL FUSE
MED COOL
LOW COOL
HI HEAT (HP)
MED HEAT (HP)
LOW HEAT (HP)
HI HEAT (EH)
MED HEAT (EH)
LOW HEAT (EH)
HI FAN
TF
HTR
- HEATER ELEMENT
X
HL
- HEATER LIMIT FUSE
X
O
O
O
O
O
O
X
X
O
O
O
MED FAN
LOW FAN
PART NO.
92170008
REV.
00
75
THERMISTORS’ RESISTANCE VALUES
(This Table Applies to All Thermistors)
INDOOR AIR SENSOR
RESISTENCE (K Ohms)
CENTR
RESISTANCE
TEMP
TOLERANCE %
F
-25
-20
-15
-10
-5
0
MIN
MAX
MIN
MAX
210.889
178.952
151.591
128.434
108.886
92.411
78.541
66.866
57.039
48.763
41.786
35.896
34.832
33.803
32.808
31.846
30.916
30.016
29.144
28.319
27.486
26.697
23.116
20.071
17.474
15.253
13.351
13.004
12.668
12.341
12.024
11.716
11.418
11.128
10.846
10.574
10.308
10.051
9.800
225.548
190.889
161.325
136.363
115.340
97.662
82.812
70.339
59.864
51.060
43.654
37.415
36.290
35.202
34.150
33.133
32.151
31.200
30.281
29.425
28.532
27.701
23.931
20.731
18.008
15.684
13.697
13.335
12.984
12.644
12.313
11.993
11.682
11.380
11.088
10.804
10.528
10.260
10.000
9.748
240.224
202.825
171.059
144.292
121.794
102.912
87.083
73.812
62.688
53.357
45.523
38.934
37.747
36.601
35.492
34.421
33.386
32.385
31.418
30.534
29.579
28.704
24.745
21.391
18.542
16.115
14.043
13.666
13.301
12.947
12.603
12.269
11.946
11.633
11.329
11.034
10.748
10.469
10.200
9.945
6.50
6.25
6.03
5.81
5.60
5.38
5.16
4.94
4.72
4.50
4.28
4.06
4.02
3.97
3.93
3.89
3.84
3.80
3.75
3.76
3.67
3.62
3.40
3.18
2.96
2.75
2.53
2.48
2.44
2.39
2.35
2.31
2.26
2.22
2.18
2.13
2.09
2.04
2.00
2.03
2.07
2.10
2.13
2.17
2.20
2.23
2.27
2.30
2.33
2.37
2.40
2.43
2.47
2.50
2.53
2.57
2.60
2.63
2.67
2.70
2.73
2.77
2.93
3.10
3.27
3.43
6.51
6.25
6.03
5.81
5.60
5.38
5.16
4.94
4.72
4.50
4.28
4.06
4.02
3.97
3.93
3.89
3.84
3.80
3.75
3.77
3.67
3.62
3.40
3.18
2.96
2.75
2.53
2.48
2.44
2.39
2.35
2.31
2.26
2.22
2.18
2.13
2.09
2.04
2.00
2.03
2.07
2.10
2.13
2.17
2.20
2.23
2.27
2.30
2.33
2.37
2.40
2.43
2.47
2.50
2.53
2.57
2.60
2.63
2.67
2.70
2.73
2.77
2.93
3.10
3.27
3.43
5
10
15
20
25
30
31
32
33
34
35
36
37
38
39
40
45
50
55
60
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
105
110
115
120
9.550
9.306
9.503
9.699
9.070
9.265
9.459
8.841
9.033
9.226
8.618
8.809
9.000
8.402
8.591
8.780
8.192
8.379
8.566
7.987
8.172
8.358
7.789
7.972
8.155
7.596
7.778
7.959
7.409
7.589
7.768
7.227
7.405
7.583
7.050
7.226
7.402
6.878
7.052
7.226
6.711
6.883
7.055
6.548
6.718
6.889
6.390
6.558
6.727
6.237
6.403
6.569
6.087
6.252
6.417
5.942
6.105
6.268
5.800
5.961
6.122
5.663
5.822
5.981
5.529
5.686
5.844
4.912
5.060
5.208
4.371
4.511
4.651
3.898
4.030
4.161
3.482
3.606
3.730
76
Kühl Remote Control
Replacement Remote Control Configuration Instructions
For Use with Kühl (cool only models) and Kühl + (cool & heat models)
Contents:
•
•
•
Remote Control with Holder
(2) AAA-batteries
Instruction Sheet
ATTENTION! – You May Need to Configure The Replacement Remote Control
Please read instructions completely before attempting configuration of the Remote Control. Failure to
do so could result in the Remote Control not being able to operate the Air Conditioning Unit properly.
Step 1. A. Locate the Model # of your Air Conditioner.
B. Identify the prefix (First 2 Letters) of your unit’s model #.
C. Look at the chart below and in it, find the prefix of your AC unit’s model #.
D. Note the Option # Code (OPT#) next to it and the required action. The unit’s
display is supposed to show this OPT# Code.
Model Prefix
Option Code
OPT 1
OPT 2
Required Action
SS, SM
SL
None – Remote Control configured for use with air conditioner
Perform Steps 2 - 5
YS, YM, YL, ES, EM, EL
OPT 3
Perform Steps 2 - 5
Step 2. Point the Remote Control at Air Conditioning Unit and then press the Remote Control’s
POWER Key once to illuminate the Air Conditioning Unit’s display.
Step 3. Once the display on the Air Conditioning Unit is illuminated, check the Option Code
number (OPT#) shown in the display and ensure it matches the OPT# code for your unit
as per the chart above.
Air Conditioner Unit’s Display (see example below Fig 1)
OPT1
OPT2
OPT3 Displayed example
Figure 1
77
Kühl Remote Control
Step 4
Checking the Remote Control’s OPT # Code
With the Remote Control’s display illuminated, press and hold the Remote Control’s
SCHEDULE and the FAN SPEED Keys simultaneously for approximately 6 seconds until
the Remote Control displays its current OPT# Code.
If the OPT# Code is different than the AC Unit’s OPT# Code see instructions below:
Remote Control
Remote Control’s OPT# Code (see example below Fig 2)
Figure 2
Using the Remote Control’s S Increase or d Decrease Keys, change the OPT# Code
displayed on the Remote Control to match the OPT # Code shown on the Air
Conditioning Unit’s display (see examples below).
Air Conditioning Unit Display
Remote Control Display
Step 5. To save the setting in the Remote Control, press and hold the Remote Control SCHEDULE
and FAN SPEED Key simultaneously for approximately 6 seconds until the displayed
configuration number on the Remote Control flashes.
The Remote Control is now configured to work with the air conditioner.
78
Kühl User Interface Service Kit
Replacement Instructions
For Use with Kühl (cool only models) and Kühl + (cool and heat models)
ATTENTION! - Please read these instructions completely before attempting replacement.
Always unplug the power supply from the power supply receptacle.
Contents:
•
•
•
•
User Interface (UI)
Ribbon Cable
2 – Mounting screws for UI
Instruction Sheet
Step 1. Disconnect ribbon cable by pulling straight out
Step 2. Remove 2 –mounting screws securing UI and disconnect ribbon cable
Step 3. Remove UI and ribbon cable from handle assembly
Step 4. Install new UI using the 2-screws, route new ribbon cable and reattach ribbon cable to UI
and Main control board
Step 5. Verify control operation
Ribbon cable connection
Mounting screws
79
INSTRUCTIONS FOR USING COOLING LOAD ESTIMATE
FORM FOR ROOM AIR CONDITIONERS
(AHAM PUB. NO. RAC-1)
A. This cooling load estimate form is suitable for estimating the cooling load for comfort air conditioning installations
which do not require specific conditions of inside temperature and humidity.
B. The form is based on an outside design temperature of 95°F dry bulb and 75°F wet bulb. It can be used for areas
in the continental United States having other outside design temperatures by applying a correction factor for the
particular locality as determined from the map.
C. The form includes “day” factors for calculating cooling loads in rooms where daytime comfort is desired (such as
living rooms, offices, etc.)
D. The numbers of the following paragraphs refer to the corresponding numbered item on the form:
1. Multiply the square feet of window area for each exposure by the applicable factor. The window area is the
area of the wall opening in which the window is installed. For windows shaded by inside shades or venetian
blinds, use the factor for “Inside Shades.” For windows shaded by outside awnings or by both outside aw-
nings and inside shades (or venetian blinds), use the factor for “Outside Awnings.” “Single Glass” includes
all types of single thickness windows, and “Double Glass” includes sealed airspace types, storm windows,
and glass block. Only one number should be entered in the right hand column for Item 1, and this number
should represent only the exposure with the largest load.
2. Multiply the total square feet of all windows in the room by the applicable factor.
3a. Multiply the total length (linear feet) of all walls exposed to the outside by the applicable factor. Doors should
be considered as being part of the wall. Outside walls facing due north should be calculated separately from
outside walls facing other directions. Walls which are permanently shaded by adjacent structures should be
considered “North Exposure.” Do not consider trees and shrubbery as providing permanent shading. An
uninsulated frame wall or a masonry wall 8 inches or less in thickness is considered “Light Construction.” An
insulated wall or masonry wall over 8 inches in thickness is considered “Heavy Construction.”
3b. Multiply the total length (linear feet) of all inside walls between the space to be conditioned and any uncondi-
tioned spaces by the given factor. Do not include inside walls which separate other air conditioned rooms.
4. Multiply the total square feet of roof or ceiling area by the factor given for the type of construction most nearly
describing the particular application (use one line only.)
5. Multiply the total square feet of floor area by the factor given. Disregard this item if the floor is directly on the
ground or over a basement.
6. Multiply the number of people who normally occupy the space to be air conditioned by the factor given. Use
a minimum of 2 people.
7. Determine the total number of watts for light and electrical equipment, except the air conditioner itself, that
will be in use when the room air conditioning is operating. Multiply the total wattage by the factor given.
8. Multiply the total width (linear feet) of any doors or arches which are continually open to an unconditioned
space by the applicable factor.
NOTE: Where the width of the doors or arches is more than 5 feet, the actual load may exceed the calculated
value. In such cases, both adjoining rooms should be considered as a single large room, and the room air
conditioner unit or units should be selected according to a calculation made on this new basis.
9. Total the loads estimated for the foregoing 8 items.
10. Multiply the subtotal obtained in item 9 by the proper correction factor, selected from the map, for the particular
locality. The result is the total estimated design cooling load in BTU per hour.
E. For best results, a room air conditioner unit or units having a cooling capacity rating (determined in accordance
with the NEMAStandards Publication for RoomAir Conditioners, CN 1-1960) as close as possible to the estimated
load should be selected. In general, a greatly oversized unit which would operate intermittently will be much less
satisfactory than one which is slightly undersized and which would operate more nearly continuously.
F. Intermittent loads such as kitchen and laundry equipment are not included in this form.
80
COOLING LOAD ESTIMATE FORM
FACTORS
BTU/Hr.
(Quantity x Factor)
HEAT GAIN FROM
QUANTITY
DAY
No
Shades*
60
Outside
(Area
Inside
1.
WINDOWS: Heat gain from the sun.
Awnings* X Factor)
Shades*
Northeast
East
____sq. ft.
____sq. ft.
____sq. ft.
____sq. ft.
____sq. ft.
____sq. ft.
____sq. ft.
____sq. ft.
20 ____
25 ____
20 ____
20 ____
30 ____
45 ____
35 ____
0 ____
Use
only
the
largest ____
load. ____
Use
only
one.
____
____
____
25
40
30
35
45
65
50
0
* These factors are for single glass
only. For glass block, multiply the
above factors by 0.5; for double
glass or storm windows, multiply the
above factors by 0.8.
80
Southeast
South
Southwest
West
75
75
110
150
120
0
____
____
____
Northwest
North
2.
3.
WINDOWS: Heat by conduction
(Total of all windows.)
_____
_____
Single glass
14
7
____sq. ft.
____sq. ft.
Double glass or glass block
WALLS: (Based on linear feet of wall)
a. Outside walls
Light Construction
Heavy Construction
_____
_____
North Exposure
30
60
____ ft.
____ ft.
20
30
Other than North exposure
b. Inside Walls (between conditioned and
unconditioned spaces only.)
_____
30
____sq. ft.
4.
5.
ROOF OR CEILING: (Use one only)
a. Roof, uninsulated
b. Roof, 1 inch or more insulation
c. Ceiling, occupied space above
d. Ceiling, insulated, with attic space above
e. Ceiling, uninsulated, with attic space above
_____
_____
_____
_____
_____
19
8
____sq. ft.
____sq. ft.
____sq. ft.
____sq. ft.
____sq. ft.
3
5
12
_____
Floor: (Disregard if floor is directly on ground or
over a basement.
3
____sq. ft.
_____
_____
6.
7.
8.
NUMBER OF PEOPLE
600
3
____
LIGHTS AND ELECTRICAL EQUIPMENT IN USE
____watts
DOORS AND ARCHES CONTINUOUSLY
OPENED TO UNCONDITIONED SPACE: (TOTAL
LINEAR FEET OF WIDTH.)
_____
_____
300
____ft.
*****
9.
SUBTOTAL
*****
10. TOTAL COOLING LOAD (BTU per hour to be used
for selection of room air conditioner(s).)
____ Total in Item 9 X ____ (Factor from Map) =
____
81
HEAT LOAD FORM
The heat load form on the following page may be used by
Following is an example using the heat load form:
servicingpersonneltodeterminetheheatlossofaconditioned
space and the ambient winter design temperatures in which
the unit will heat the calculated space.
A space to be conditioned is part of a house geographically
located in an area where the lowest outdoor ambient winter
temperature is 40°F. The calculated heat loss is 184 BTU/
Hr./°F.
The upper half of the form is for computing the heat loss of
the space to be conditioned. It is necessary only to insert
the proper measurements on the lines provided and multiply
by the given factors, then add this result for the total heat
loss in BTU/Hr./°F.
Subtract 40°F (lowest outdoor ambient temperature for the
geographical location) from 70°F (inside design temperature
of the unit) for a difference of 30°F. Multiply 184 by 30 for a
5500 BTU/Hr. total heat loss for the calculated space.
The BTU/Hr. per °F temperature difference is the 70°F
inside winter designed temperature minus the lowest outdoor
ambient winter temperature of the area where the unit is
installed. This temperature difference is used as the multiplier
when calculating the heat loss.
On the graph, plot the base point (70°) and a point on the
40°F line where it intersects with the 5500 BTU/Hr. line on
the left scale. Draw a straight line from the base point 70
through the point plotted at 40°F. This is the total heat loss
line.
The graph shows the following:
Knowing that we have a 5500 BTU/Hr. heat loss, and
we expect that our heat pump will maintain a 70°F inside
temperature at 40°F outdoor ambient, we plot the selected
unit capacity BTU/Hr. of the unit between 35° and 60° on the
graph and draw a straight line between these points. Where
the total heat loss line and the unit capacity line intersect,
read down to the outdoor ambient temperature scale and
find that this unit will deliver the required BTU/Hr. capacity
to approximately 30°F.
Left Hand Scale
Unit capacity BTU/Hr. or heat loss
BTU/Hr.
Bottom Scale
Outdoor ambient temperature, base
point.
Heat Pump Model
Balance Point
BTU/Hr. capacity heat pump will
deliver at outdoor temperatures.
Maximum BTU/Hr. heat pump
will deliver at indicated ambient
temperature.
82
HEATING LOAD FORM
FRIEDRICH ROOM UNIT HEAT PUMPS
BTU/HR PER
WALLS: (Linear Feet)
2” Insulation
°F TEMP. DIFFERENCE
Lin. Ft. x 1.6
Average
Lin. Ft. x 2.6
WINDOWS & DOORS (Area, sq. ft.)
Single Glass:
Sq. Ft. x 1.13
Sq. Ft. x 0.61
Double Glass:
INFILTRATION - WINDOWS & DOORS: AVG.
Lin. Ft. x 1.0
Lin. Ft. x 2.0
Loose
CEILING: (Area, Sq. Ft.)
Insulated (6”)
Sq. Ft. x 0.07
Sq. Ft. x 0.10
Sq. Ft. x 0.10
Sq. Ft. x 0.20
Sq. Ft. x 0.33
Insulated (2”)
Built-up Roof (2” insulated
Built-up Roof (1/2” insulated)
No Insulation
FLOOR: (Area, Sq. Ft.)
Above Vented Crawl space
Insulated (1:)
Sq. Ft. x 0.20
Sq. Ft. x 0.50
Uninsulated
* Slab on Ground
1” Perimeter insulation
* Based on Linear Feet of outside wall
Lin. Ft. x 1.70
Lin. Ft. x 1.00
TOTAL HEAT LOSS PER °F BTU/HR/°F
Multiply total BTU/HR/°F X 30 and plot on the graph below at 40°F. Draw a straight line from
the 70 base point thru the point plotted at 40°F. The intersection of this heat loss line with the
unit capacity line represents the winter design heating load.
83
Friedrich Air Conditioning Company
P.O. Box 1540
San Antonio, TX 78295
210.357.4400
ROOM AIR CONDITIONERS
LIMITED WARRANTY
FIRST YEAR
ANY PART: If any part supplied by FRIEDRICH fails because of a defect in workmanship or material within twelve months from date of original
purchase, FRIEDRICH will repair the product at no charge, provided room air conditioner is reasonably accessible for service. Any additional
labor cost for removing inaccessible units and/or charges for mileage related to travel by a Service Agency that exceeds 25 miles one way will
be the responsibility of the owner. This remedy is expressly agreed to be the exclusive remedy within twelve months from the date of the original
purchase.
SECOND THROUGH FIFTH YEAR
SEALED REFRIGERANT SYSTEM: If the Sealed Refrigeration System (defined for this purpose as the compressor, condenser coil, evaporator
coil, reversing valve, check valve, capillary, filter drier, and all interconnecting tubing) supplied by FRIEDRICH in your Room Air Conditioner fails
because of a defect in workmanship or material within sixty months from date of purchase, FRIEDRICH will pay a labor allowance and parts
necessary to repair the Sealed Refrigeration System; PROVIDED FRIEDRICH will not pay the cost of diagnosis of the problem, removal, freight
charges, and transportation of the air conditioner to and from the Service Agency, and the reinstallation charges associated with repair of the
Sealed Refrigeration System. All such cost will be the sole responsibility of the owner. This remedy is expressly agreed to be the exclusive remedy
within sixty months from the date of the original purchase.
APPLICABILITY AND LIMITATIONS: This warranty is applicable only to units retained within the Fifty States of the U.S.A., District of Columbia,
and Canada. This warranty is not applicable to:
1. Air filters or fuses.
2. Products on which the model and serial numbers have been removed.
3. Products which have defects or damage which results from improper installation, wiring, electrical current characteristics, or
maintenance; or caused by accident, misuse or abuse, fire, flood, alterations and/or misapplication of the product and/or units
installed in a corrosive atmosphere, default or delay in performance caused by war, government restrictions or restraints, strikes,
material shortages beyond the control of FRIEDRICH, or acts of God.
OBTAINING WARRANTY PERFORMANCE: Service will be provided by the FRIEDRICH Authorized Dealer or Service Organization in your
area. They are listed in the Yellow Pages. If assistance is required in obtaining warranty performance, write to: Room Air Conditioner Service
Manager, Friedrich Air Conditioning Co., P.O. Box 1540, San Antonio, TX 78295-1540.
LIMITATIONS: THIS WARRANTY IS GIVEN IN LIEU OF ALL OTHER WARRANTIES. Anything in the warranty notwithstanding, ANY
IMPLIED WARRANTIES OF FITNESS FOR PARTICULAR PURPOSE AND/OR MERCHANTABILITY SHALL BE LIMITED TO THE DURATION
OF THIS EXPRESS WARRANTY. MANUFACTURER EXPRESSLY DISCLAIMS AND EXCLUDES ANY LIABILITY FOR CONSEQUENTIAL
OR INCIDENTAL DAMAGE FOR BREACH OF ANY EXPRESSED OR IMPLIED WARRANTY.
Performance of Friedrich’s Warranty obligation is limited to one of the following methods:
1. Repair of the unit
2. A refund to the customer for the prorated value of the unit based upon the remaining warranty period of the unit.
3. Providing a replacement unit of equal value
The method of fulfillment of the warranty obligation is at the sole discretion of Friedrich Air Conditioning.
NOTE: Some states do not allow limitations on how long an implied warranty lasts, or do not allow the limitation or exclusion of consequential or
incidental damages, so the foregoing exclusions and limitations may not apply to you.
OTHER: This warranty gives you specific legal rights, and you may also have other rights which vary from state to state.
PROOF OF PURCHASE: Owner must provide proof of purchase in order to receive any warranty related services.
All service calls for explaining the operation of this product will be the sole responsibility of the consumer.
All warranty service must be provided by an Authorized FRIEDRICH Service Agency, unless authorized by FRIEDRICH prior to repairs being
made.
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TECHNICAL SUPPORT
CONTACT INFORMATION
FRIEDRICH AIR CONDITIONING CO.
Post Office Box 1540 · San Antonio, Texas 78295-1540
4200 N. Pan Am Expressway · San Antonio, Texas 78218-5212
(210) 357-4400 · 877-599-5665 x 846 · FAX (210) 357-4490
Email: [email protected]
Printed in the U.S.A.
FRIEDRICH AIR CONDITIONING CO.
Post Office Box 1540 · San Antonio, Texas 78295-1540
4200 N. Pan Am Expressway · San Antonio, Texas 78218-5212
(210) 357-4400 · FAX (210) 357-4490
Kuhl-ServMan (5-10)
Printed in the U.S.A.
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