40QA024-060
Ceiling-Suspended Fan Coil Units
Installation, Start-Up and Service Instructions
CONTENTS
SAFETY CONSIDERATIONS
Page
Installing and servicing air-conditioning equipment can be
hazardous due to system pressure and electrical components.
Only trained and qualified service personnel should install or
service air-conditioning equipment.
Untrained personnel can perform basic maintenance, such
as cleaning and replacing filters. All other operations should be
performed by trained service personnel. When working on air-
conditioning equipment, observe precautions in literature and
on tags and labels attached to unit.
Follow all safety codes. Wear safety glasses and work
gloves. Use quenching cloth for brazing operations. Have fire
extinguisher available. Read these instructions thoroughly.
Consult local building codes and National Electrical Code
(NEC) for special installation requirements.
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . . .1
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17
Step 1 — Complete Pre-Installation
Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
• UNPACK UNIT
• INSPECT SHIPMENT
• BEFORE INSTALLATION
Step 2 — Select Location. . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Step 3 — Mount Unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
• WOODEN STRUCTURE
• NEWLY BUILT CONCRETE SLAB
• METAL STRUCTURE
• PREVIOUSLY BUILT CONCRETE SLAB
• TO MOUNT UNIT
• TO INSTALL THERMOSTAT
Step 4 — Connect Refrigerant Piping. . . . . . . . . . . . . . . .7
Step 5 — Connect Condensate Drain Line . . . . . . . . . . .8
Step 6 — Make Electrical Connections . . . . . . . . . . . . .10
Step 7 — Install Thermostat . . . . . . . . . . . . . . . . . . . . . . . .12
Step 8 — Make Connections Between
Before installing or servicing system, always turn off
main power to system. There may be more than one dis-
connect switch. Turn off accessory heater power if appli-
cable. Electrical shock can cause personal injury.
Indoor and Outdoor Units . . . . . . . . . . . . . . . . . . . . . . . .15
• CHECK ACCURATOR METERING DEVICE
• COOLING ONLY SYSTEMS
• HEAT PUMP SYSTEMS
INSTALLATION
START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18,19
After Extended Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . .18
Seasonal Changeovers . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Adjusting Airflow. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Operating Mode Memory . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Automatic Operation (Auto.) Mode. . . . . . . . . . . . . . . . . .18
Operating Sequence. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
• FAN OPERATION
Installation instructions for fan coil units (Fig. 1) are con-
tained in this manual. Refer to this manual for proper installa-
tion of the complete system. Note that the outdoor units are
shipped with installation and service instructions for basic in-
stallation of the outdoor section. Be sure to make the connec-
tions in Cooling Only Systems and Heat Pump Systems sec-
tions on page 15 of this literature so that the unit will operate
properly.
• COOLING MODE OPERATION
• HEAT PUMP OPERATION
Refer to Table 1 for proper system matches.
• DEFROST (Heat Pump Only)
• SYSTEM SAFETIES
• SPECIAL OPERATION, HEATING
CLEANING AND MAINTENANCE . . . . . . . . . . . . . . . . 19,20
Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Air Filters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
• REMOVE AIR FILTERS
• CLEAN OR REPLACE FILTERS
Clean Indoor Unit Bottom Panel . . . . . . . . . . . . . . . . . . . .20
Clean Indoor Coil. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Clean Outdoor Coil (Outdoor Unit). . . . . . . . . . . . . . . . . .20
Clean Condensate Drains . . . . . . . . . . . . . . . . . . . . . . . . . .20
• CLEAN OR REPLACE DRAIN PAN
SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Before Calling for Service . . . . . . . . . . . . . . . . . . . . . . . . . .20
• IF SYSTEM FAILS TO OPERATE
FRESH AIR INSTALLATION OPTION . . . . . . . . . . . . . . . .20
Ventilation-Air Accessory . . . . . . . . . . . . . . . . . . . . . . . . . .20
TROUBLESHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . . .CL1, CL-2
Fig. 1 — Ceiling-Suspended Fan Coil Unit
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 02-40QA0007-SI Printed in U.S.A. Form 40QA-7SI Pg 1 706 3-06 Replaces: 40QA-5SI
Book 1
4
Tab 3d 2c
Table 3A — Physical Data, Under Ceiling Cooling Only Units
SYSTEM SIZE
018*
11/2
18,000
108
024
2
24,000
108
030
3
30,000
117
036
3
36,000
117
048
4
48,000
149
060
5
60,000
179
NOMINAL CAPACITY (tons)
NOMINAL SIZE (Btuh)
OPERATING WEIGHT (lb)
MOISTURE REMOVAL WEIGHT
(Pints/Hr)
4.0
7.3
6.0
9.0
13.0
14.5
FINISH
GM Motorhome White with Black Trim
REFRIGERANT
Control (Cooling)
R-410A
AccuRater Control
INDOOR FAN
Direct Drive Centrifugal
Rpm...Cfm High
862...500
690...400
552...320
92
1050…600
690...400
552...320
92
1275...840
972...740
830...640
282
1275...840
972...740
830...640
282
1435...1200
1388...1160
1315...1100
425
1275...1600
972...1220
830...1040
564
Rpm...Cfm Medium
Rpm...Cfm Low
High Speed Watts
Motor Quantity
1
1
1
1
2
2
Blowers — No. ...Size (in.)
2...6x8
2…6x8
2…6x8
2…6x8
3…6x8
4…6x8
INDOOR COIL
Face Area (sq ft)
No. of Rows
Fins/in.
Copper Tube, Aluminum Fin
2.2
4
14.9
4
2.2
4
14.9
4
2.6
4
2.6
4
3.0
4
14.9
8
4.0
4
14.9
8
14.9
4
14.9
4
Circuits
FILTERS
Quantity
Cleanable
4
4
5
5
6
8
AIRSWEEP
Horizontal
Vertical
User select ON/OFF
Manual
CONTROLS
Control Voltage
24 V
Yes
Auto Restart
Fan Speed
Condensate Pump Safety
Indoor Coil Freeze Protection
Filter Change Indication
High/Medium/Low
Yes (Accessory)
Standard shutoff at 28 F
250 Hours of Indoor Fan Operation
REFRIGERANT LINES
Connection Type
Liquid Line OD (in.)
Vapor Line OD (in.)
Max Line Length
Flare
3
/
8
7/8†
5
5
3
3
7
/
/
/
/
/
For8maximum line lengths see condensing unit instructions.
8
4
4
8
CONDENSATE DRAIN
CONNECTION
CONDENSATE DRAIN SIZE (in.)
Pipe Thread (MPT)
3
/
4
*Field reconfigured to 18,000 Btuh (11/2 tons). See Before Installa-
tion section on this page for details.
† The valve connection size is 7/8 inch. The recommended line size
is 11/8 inch.
Step 1 — Complete Pre-Installation Checks
UNPACK UNIT — Store fan coil unit in the original packag-
ing until it is moved to the final site for installation. When re-
moving unit from carton, lift unit by its 4 corners; DO NOT lift
unit by its plastic parts.
INSPECT SHIPMENT — Upon receipt of shipment, check
fan coil unit for damage. Forward claim papers directly to the
transportation company. Manufacturer is not responsible for
damage incurred in transit.
Check all items; if any item is missing, notify your dealer.
To prevent loss or damage, leave all parts in original packages
until installation.
BEFORE INSTALLATION — Perform the following steps
before installing indoor fan coil unit. Place the indoor unit up-
side down on the floor, then:
1. Remove side panels by sliding forward, then away
NOTE: Dimensions shown in brackets [ ] are in mm.
from sides of unit (Fig. 2). Reinstall prior to unit start-
up.
Fig. 2 — Removal of Mounting Brackets
from Indoor Unit
2. Remove air filters from inlet grilles; then remove and
retain screws securing inlet grilles to indoor unit. Rein-
stall prior to unit start-up.
3
Table 3B — Physical Data, Under Ceiling Heat Pump Units
UNIT SIZE
018*
11/2
18,000
110
024
2
24,000
110
030
3
30,000
119
036
3
36,000
119
048
4
48,000
151
060
5
60,000
181
NOMINAL CAPACITY (tons)
NOMINAL SIZE (Btuh)
OPERATING WEIGHT (lb)
MOISTURE REMOVAL WEIGHT
(Pints/Hr)
4.0
7.3
6.0
9.0
13.0
14.5
FINISH
GM Motorhome White with Black Trim
REFRIGERANT
Control (Cooling)
R-410A
AccuRater Control
TXV
INDOOR FAN
Direct Drive Centrifugal
Rpm...Cfm High
900…480
862...400
770...320
92
1050…550
900…480
862...400
92
1275...840
972...740
830...640
282
1275...840
972...740
830...640
282
1435...1130
1388... 975
1315... 820
425
1275...1600
972...1220
830...1040
564
Rpm...Cfm Medium
Rpm...Cfm Low
High Speed Watts
Motor Quantity
1
1
1
1
2
2
Blowers — No. ...Size (in.)
2...6x8
2...6x8
2...6x8
2...6x8
3...6x8
4...6x8
INDOOR COIL
Face Area (sq ft)
No. of Rows
Fins/in.
Copper Tube, Aluminum Fin
2.2
4
14.9
4
2.2
4
14.9
4
2.6
4
2.6
4
3.0
4
14.9
8
4.0
4
14.9
8
14.9
4
14.9
4
Circuits
FILTERS
Quantity
Cleanable
4
4
5
5
6
8
HEATERS (kW)
2.0
2.0
3.0
3.0
4.0
5.0
AIRSWEEP
Horizontal
Vertical
User select ON/OFF
Manual
CONTROLS
Control Voltage
Defrost Method
Dehumidification
Auto Restart
24 V
Timed
Yes
Yes
Fan Speed
High/Medium/Low
Condensate Pump Safety
Filter Change Indication
Freeze Protection
Yes (Accessory)
250 Hours of Indoor Fan Operation
Indoor coil less than 28 F, resets at 50 F.
REFRIGERANT LINES
Connection Type
Liquid Line OD (in.)
Vapor Line OD (in.)
Max Line Length
Flare
3
/
8
7/8†
5
5
3
3
7
/
/
/
/
/
For8maximum line lengths see condensing unit instructions.
8
4
4
8
CONDENSATE DRAIN
CONNECTION
CONDENSATE DRAIN SIZE (in.)
Pipe Thread (MPT)
3
/
4
*Field reconfigured to 18,000 Btuh (11/2 tons). See Before Installa-
tion section on page 3 for details.
†The valve connection size is 7/8 inch. The recommended line size
is 11/8 inch.
3. Remove inlet grilles from indoor unit by sliding for-
ward. Reinstall prior to unit start-up.
construction. Plan the installation carefully before you begin.
Listed below are some guidelines that should be followed
when determining location for the unit.
IMPORTANT: If necessary, reconfigure the 24,000 Btuh
fan coil unit to 18,000 Btuh. Unplug the fan motor at the
control box harness and plug into the 40QA018 marked
connector.
1. Place unit adjacent to an outside wall if fresh air is
required, ensuring that location allows for complete air
distribution.
2. Locate the thermostat in an area that is not subjected to
drafts or direct sunlight through windows. Locate the
thermostat on an internal wall whenever possible.
3. Allow sufficient clearance for airflow, wiring, refriger-
ant piping, and servicing unit (Fig. 3 and 4).
4. Make sure the unit is easily accessible to electrical
power.
Step 2 — Select Location — Consult local building
codes and NEC for special installation requirements. See Fig. 3
and 4 for unit dimensions and required clearances.
There are several ways the unit may be installed to different
types of ceiling construction. These instructions do not cover
all installation methods. As a typical installation, these instruc-
tions focus primarily on mounting the unit to metal in new
4
NOTES:
1. Dimensions in [ ] are in millimeters.
2. Direction of airflow.
3. Standard unit clearances are as follows:
• 0″ on top and rear
• 3″ on left side
• 12″ on right side
• 36″ on bottom
(When facing unit discharge.)
WEIGHT (lb)
Cooling Only Heat Pump
A
B
E
F
G
UNIT
SIZE
ft-in.
4- 215/16 1294 3-10
4-1013/16 1493 4- 57/8 1368 4- 91/2 1459
5-119/16 1817 5- 65/8 1692 5-101/4 1783 1- 97/8 555 3- 31/16 992
7- 8 2336 7- 3
2211 7- 65/8 2302 1-115/8 601 4-119/16 1512
mm ft-in. mm ft-in. mm ft-in. mm ft-in.
mm
024
036
048
060
108
117
149
179
110
119
151
181
1169 4- 15/8 1260
—
—
—
—
1- 95/8 549
2- 11/2 648
Fig. 3 — Base Unit Dimensions
5
Fig. 4 — Fan Coil Unit Clearances
5. Run refrigerant piping as directly as possible and avoid
any unnecessary turns or bends.
6. Condensate piping can be directed through the inside
wall to an approved drain or straight outside.
NOTE: The piping hole for condensate line must slope at a
minimum pitch of 1/4 in. per foot to ensure proper drainage. If
proper pitch cannot be achieved, install accessory condensate
pump at this time.
Step 3 — Mount Unit — Refer to Fig. 4 for clearances
and dimensions. Use mounting template included inside box to
locate mounting bolt holes, piping holes, electrical connec-
tions, and accessory outdoor-air intake, if used.
Select proper type of hardware from the guidelines below.
See Fig. 5.
Fig. 5 — Fan Coil Unit Mounting Methods
(Hardware is Field-Supplied)
Solid structure in ceiling must be used due to the weight of
the unit.
2. Determine installation position, paying particular
attention to piping lengths, wiring connections, clear-
ances, etc. See Fig. 3 for connection locations, Fig. 4
for clearances, and Fig. 7 and 8 for bolt locations.
WOODEN STRUCTURE — Install hanging bolts on a
square wooden piece placed over beams.
3. Open knockout if right-side piping connections are
required (Fig. 9), by removing the pre-slit portion in
the rear of the right side panel with a saw or cutter
knife.
4. Mount hanging brackets on ceiling (Fig. 10) for either
concealed or exposed bolt hanging position.
5. Lift the unit into place, and fit the hex-head bolts on
sides of indoor unit into mounting slots of mounting
brackets (Fig. 11). Ensure unit is mounted with a slight
tilt to the right rear side for properly drainage.
NEWLY BUILT CONCRETE SLAB — Install hanging bolts
with inserts, embedded bolts, etc.
METAL STRUCTURE — Install hanging bolts utilizing an
existing angle or by installing a new support angle.
PREVIOUSLY BUILT CONCRETE SLAB — Install hang-
ing bolts with expansion anchor.
TO MOUNT UNIT:
1. Remove mounting bracket and reinstall the 2 hex-head
bolts (factory-supplied) into each side of indoor unit as
3
shown in Fig. 6. Allow approximately /8-in. space
6. Tighten indoor unit hex-head bolts securely.
between bolt head and unit.
6
TO INSTALL THERMOSTAT:
3
If there is at least /8 in. of space between the back of indoor
unit and wall:
1. Route thermostat wires (field-supplied) through slot in
right side or rear panel of indoor unit (Fig. 3).
2. Route wires over refrigerant and drain piping as shown
in Fig. 12.
IMPORTANT: Do not route wires under the piping, or
wires could impede air filter removal.
Fig. 6 — Installing Hex-Head Mounting Bolts
in Fan Coil Unit
Step 4 — Connect Refrigerant Piping — Fan coil
units may be connected to outdoor units using field-supplied
refrigerant grade piping. Refer to Tables 3A and 3B for the cor-
rect size piping. The length of refrigerant pipe depends on the
unit placement and building structure; run pipes as directly as
possible. For piping requirements over 50 ft of total run, or
more than 25 ft of lift, consult the Residential Long Line Appli-
cation Guide.
DO NOT BURY MORE THAN 36 IN. OF REFRIGER-
ANT PIPE IN THE GROUND. If any section of pipe is
buried, there must be a 6-in. vertical rise to the valve con-
nections on the outdoor unit. If more than the recommended
length is buried, refrigerant may migrate to the cooler, bur-
ied section during extended periods of unit shutdown, caus-
ing refrigerant slugging and possible compressor damage at
start-up.
DIMENSIONS (in.)
UNIT SIZE
A
B
C
024
036
048
060
5015/16
5813/16
719/16
92
46
495/8
571/2
701/4
905/8
537/8
665/8
87
Fig. 7 — Fan Coil Unit Hanging Dimensions
To connect piping:
1. Install insulation. It is extremely important that all
refrigerant lines and the metering device be insulated
on heat pumps and multi-splits. On cooling only units,
the liquid line may be left uninsulated. Use any accept-
able heat resistant closed-cell foam insulation (mini-
3
mum /8-in. wall thickness). When insulating piping,
cap ends and slide insulation over the piping. Insula-
tion can also be cut and placed over piping.
2. Run liquid and gas refrigerant piping.
a. Run pipes as directly as possible, and avoid any
unnecessary turns and bends.
b. Suspend refrigerant pipes so that the insulation is
not damaged and vibrations are not transmitted to
the structure.
c. Leave slack in the refrigerant pipe between the
structure and the unit to absorb vibrations.
d. A piston is shipped in the factory-installed meter-
ing device body (Fig. 13) with the indoor unit. Use
Tables 4A-4C to verify that you have the required
piston size for the system being installed.
DIMENSIONS (in.)
UNIT SIZE
B
C
024
036
048
060
46
495/8
571/2
701/4
905/8
537/8
665/8
87
*Exposed mounting holes.
IMPORTANT: The metering device is factory-
installed and only needs to be replaced for long line
applications or if the system combination requires it.
See Tables 4A-4C. See Fig. 13.
†Reverse bracket holes (concealed mounting).
Fig. 8 — Mounting Included with
Fan Coil Unit
e. For special applications such as long lines or raised
elevations, consult the Residential Long Line
Application Guide for specific system require-
ments. The arrow on the metering device body
must face away from the indoor coil.
Fig. 9 — Removing Rear Knockout in Side Panel
if Right-Side Piping Connection is Used
7
f. Refer to the outdoor unit Installation, Start-Up and
Service Instructions for additional information.
g. Install a factory-supplied filter drier near the out-
door unit. On heat pump systems, a bi-flow filter
drier must be used.
2. To ensure regular flow of condensate water, the drain
pipe should be pitched toward an open drain or sump
at a downward slope of at least 1/4-in. per ft.
3. Attach plate with screws under piping hole.
4. Attach drain pipe with nylon wire tie passing through
hole (Fig. 15).
NOTE: Do not fasten nylon wire ties tight enough to
deform the insulation, as this affects its performance.
5. Insulate condensate drain line(s) that are located in or
above an occupied area with a condensate-proof mate-
rial such as polyurethane or neoprene.
3. Insulate and caulk wall openings to reduce air infiltra-
tion and refrigerant pipe vibrations on structure.
4. Evacuate piping, if necessary. If either refrigerant pip-
ing or the indoor coil is exposed to atmospheric condi-
tions, it must be evacuated to 1000 microns to
eliminate contamination and moisture in the system.
Step 5 — Connect Condensate Drain Line —
Observe all local sanitary codes when installing condensate
drains. Refer to Fig. 3 and 14 for drain pipe connection from
indoor unit.
1. Use hard polyvinyl chloride (PVC) pipe material with
nominal ID of 3/4 in. to connect at drain line. Use pipe
insulation 1/4-in. thick, such as Armaflex insulation, on
exposed piping inside the conditioned space.
6. Install an external trap at the end of the condensate
line.
NOTE: Should the installation require one, a conden-
sate pump may be ordered as a field-installed
accessory.
Table 4A — Piston and Charge Combinations — Cooling Only Systems
COOLING
INDOOR UNIT SIZE
OUTDOOR UNIT
38HDR
PISTON
CHARGE (lb)
SIZE
018
024
030
036
048
060
57
57
65
70
80
90
7.0
7.75
10.1
8.9
12.2
12.5
024
036
048
060
Table 4B — Piston and Charge Combinations — Heat Pump Systems
HEAT PUMP
INDOOR UNIT SIZE
OUTDOOR UNIT
38QRR
PISTON SIZE
INDOOR
PISTON SIZE
OUTDOOR
CHARGE (lb)
018
024
030
036
048
060
49
55
65
70
82
—*
40
43
55
63
73
80
7.5
7.8
12
13
12.2
12.8
024
036
048
060
*Size 060 indoor heat pump systems use a TXV (thermostatic expansion valve), part no. EA36YD250.
Table 4C — Piston and Charge Combinations — Heat and Cool Systems
HEAT PUMP
INDOOR UNIT SIZE
OUTDOOR UNIT
38HDR
PISTON
SIZE
CHARGE (lb)
018
024
030
036
048
060
57
57
65
70
80
—*
7.0
7.75
10.1
8.9
12.2
12.5
024
036
048
060
*Size 060 indoor heat pump systems use a TXV (thermostatic expansion valve), part no. EA36YD250.
8
Fig. 10 — Mounting Hanging Brackets
NOTE: Teflon Seal must face toward the outdoor heat pump unit.
Fig. 13 — AccuRater Metering Device at Service
Valve (Bypass Type Components),
Heat Pump Systems Only
Fig. 11 — Hanging Fan Coil Unit
*Field-supplied.
Fig. 12 — Routing Wires Over Piping
9
outdoor unit if disconnect can be locked; check local code
before installing in this manner.
1. Route ground and power wires.
Step 6 — Make Electrical Connections — Be sure
field wiring complies with local building codes and NEC, and
unit voltage is within limits shown in Table 5.
Contact local power company for correction of improper
line voltage.
According to NEC and most local codes, the unit must have
an uninterrupted, unbroken ground to minimize personal
injury if an electric fault should occur. The ground may
consist of electrical wire or metal conduit when installed in
accordance with existing electrical codes. Failure to follow
this warning could result in an electric shock, fire, or death.
To avoid personal injury or damage to unit, do not make
electrical connections until all power sources are shut
down, locked out, and tagged off. Failure to do so could
result in personal injury or unit damage.
2. Route line power leads (see Fig. 16) from indoor dis-
connect to the fan coil unit. Place wire through hole on
the control box (Fig. 17). Connect wire to high voltage
terminal board (TB1) and ground screw. When routing
the wire in the unit, use care to keep the wire away
from refrigerant and condensate piping and any sharp
edges. The 208/230-v units are factory wired for
230-v to 24-v transformer operation. For 208-v to
24-v operation, interchange blue (208-v) and red
(230-v) wires. Cap any unused wires with wire nuts.
Operation of unit on improper line voltage constitutes abuse
and could affect warranty. Refer to Table 5 for permissible
operating limits. Do not install unit in system where voltage
may fluctuate above or below permissible limits.
NOTE: Use copper wire only between disconnect switch(es)
and unit.
NOTE: Install branch circuit disconnect of adequate size to
handle unit starting current per NEC. Locate disconnect within
sight of, and readily accessible from, unit, per Section 440-14
of NEC. Some codes allow indoor unit to share disconnect with
Table 5 — Electrical Data*
FAN
HEATER
POWER
MOCP
15
SYSTEM
TYPE
UNIT
SIZE
MIN WIRE SIZE
(AWG)
Motor 1 FLA
Motor 2 FLA
kW
—
—
FLA
—
—
MCA
0.53
1.60
2.00
3.30
FLA
0.50
1.30
1.60
2.60
024†
036
048
060
024†
036
048
060
0.5
1.3
1.1
1.3
0.5
1.3
1.0
1.3
—
—
0.5
1.3
—
—
0.5
1.3
14
14
14
14
14
14
12
10
15
15
15
15
20
25
30
COOLING
ONLY
—
—
—
—
2.00
3.00
4.00
5.00
8.66
13.00
17.40
21.70
9.29
9.16
17.70
23.80
28.70
14.30
19.00
24.30
HEAT PUMP
LEGEND
AWG — American Wire Gage
FLA — Full Load Amps
MCA — Minimum Circuit Amps per NEC Section 430-24
MOCP — Maximum Overcurrent Protection
NEC — National Electrical Code
*All units are 208/230-1-60. Minimum operating voltage is 187, max-
imum is 253. Units will operate satisfactorily within this voltage
range.
†Electrical data is the same for both the 24,000 Btuh 024 unit and
the 024 unit that has been field-reconfigured for 18,000 Btuh. Refer
to Before Installation section on page 3 for reconfiguration details.
10
LEGEND
NOTES:
1. All piping must follow standard refrigerant piping techniques.
2. All wiring must comply with the applicable local and national codes.
3. Liquid line need not be insulated (cooling only units).
4. Wiring and piping shown are general points-of-connection guides
only and are not intended for a specific installation.
5. Insulate condensate line if run above a conditioned space.
7. Metering device is provided.
φ
— Phase
NEC — National Electrical Code
Piping
Line Voltage
24 V
Thermistor
*Standard.
†Accessory item.
**Field supplied.
††Insulate for heat pump application.
Fig. 14 — Component Location (Typical Ceiling-Suspended System)
11
Step 7 — Install Thermostat — These systems use a
3-speed thermostat. The thermostat monitors the system opera-
tion and controls the operating mode. To change settings or re-
fer to the thermostat Operating Instructions.
Mount thermostat to a wall in the occupied space using
2 field-supplied screws. Locate the thermostat in an area that is
not subjected to drafts or direct sunlight through windows.
Locate thermostat on an interior wall whenever possible.
Figure 18 shows available thermostats.
LEGEND
TB — Terminal Block
Fig. 16 — Line Power Connections
Fig. 15 — Routing Drain Piping
12
2 sn
LEGEND
ASM
ASR
— Air Sweep Motor
— Air Sweep Relay
NEC
PL
— National Electrical Code
— Plug
Terminal Block
EQUIP GND — Equipment Ground
TB
— Terminal Board
Factory Wiring
FL
— Fuse Link
TRAN — Transformer
FPT
HP
— Freeze Protection Thermostat
— Heat Pump
Field Power Wiring
Field Control Wiring
Terminal (Marked)
HR
— Heater Relay
— Heater
Terminal (Unmarked)
Splice
HTR
HTT
IFM
Printed Circuit Board
— Heater Temp. Thermostat
— Indoor-Fan Motor
Accessory or Optional Wiring
NOTES:
1. If any of the original wire furnished must be replaced, it must be replaced with type 90 C wire or its equivalent.
2. Wire in accordance with NEC and local codes.
3. Transformer is thermally protected and will reset automatically.
4. Indoor-fan motor(s) are inherently thermally protected.
Fig. 17 — Control Circuit Connections Arrangement
13
COOL
HEAT
AUTO
SLIMLINE THERMOSTAT
CARRIER
FLAT THERMOSTAT (FLATSTAT)
CARRIER
HEAT PUMP
COOLING ONLY
HEAT & COOL
COOLING ONLY
HEAT & COOL
(53DFS250-SL)
(53DFS250-FS)
COOL
AUTO
HEAT
5-1-1 PROGRAMMABLE THERMOSTAT
CARRIER
COOLING ONLY
HEAT & COOL
(53DFST2-NP)
Fig. 18 — Thermostats
14
The heat pump unit uses a timed defrost method. The timed
defrost can be field set for 30, 50, or 90 minutes. The timed de-
frost is factory set for 90 minutes.
Step 8 — Make Connections Between Indoor
and Outdoor Units — The thermostat is wired between
the indoor and outdoor units to make the system complete.
CHECK ACCURATER METERING DEVICE — The cor-
rect AccuRater (bypass type) refrigerant control is required for
system capacity optimization. An AccuRater device
(see Fig. 19) is supplied with the outdoor unit. Refer to
Tables 4A-4C to determine the correct AccuRater piston size
and charge combination required for the condenser/evaporator
system being installed.
Piston style as shown in Fig. 19 is shipped with the unit.
Do not interchange components between the AccuRater device
types.
COOLING ONLY SYSTEMS — The following connec-
tions must be made to the outdoor unit for it to operate as a sys-
tem with the indoor unit:
38HDR018-060
Route 2 wires of field-supplied 18-gage AWG (American
Wire Gage) thermostat cable between the low-voltage terminal
block of the fan coil unit and the blue and brown low-voltage
wires in the outdoor unit low voltage terminal block. Connect
the wires Y1 to Y and C to C. See Fig. 20.
HEAT PUMP SYSTEMS — The following connections
must be made to the outdoor unit for it to operate as a system
with the indoor unit:
Route 5 wires of field-supplied 18-gage AWG thermostat
cable between the low-voltage terminal block of the fan coil
and the outdoor unit low-voltage terminal block. Connect Y1
to Y, R to R, O to O, W2 to W2, and C to C with the wires. See
Fig. 21.
38QRR018-060
Fig. 19 — AccuRater (Bypass Type)
Metering Device Components
15
Fig. 20 — Cooling System Wiring Diagram
16
Fig. 21 — Heat Pump Wiring Diagram
17
START-UP
Operating Sequence — Ceiling-suspended fan coil
units have a relay board which controls system operation in re-
sponse to a room thermostat. The user may manually select any
one of 3 fan speeds for unit operation. Ceiling-suspended sys-
tems may be equipped with an accessory power ventilation kit
and/or condensate pump.
Never operate unit without a filter or with grille removed;
damage to the unit or personal injury may result.
FAN OPERATION — Fan coils are capable of 3-speed opera-
tion. See thermostat instructions for fan speed selection. When
the fan(s) is operating in medium or high speed and the unit is
equipped with the power ventilation kit, the ventilation fan will
operate to provide fresh air.
COOLING MODE OPERATION — When the room ther-
mostat senses a demand for cooling, the fan coil relay board is
energized. The indoor fan(s) will start in the selected speed (if
it is not already operating). The reversing valve (heat pump
only) will energize for cooling operation.
Make the following checks and complete the Start-Up
Checklist on page CL-1 before system start-up. Also refer to
the condensing unit Installation, Start-Up and Service Instruc-
tions for system start-up instructions and refrigerant charging
methods.
1. Check condensate drainage system:
a. Remove grille and frame from the unit.
b. On the opposite side of the drain connection, insert
a water bottle up into the fan coil unit and fill drain
pan. Refer to Fig. 22. Water must flow steadily; if
not, check the pipe slope or inspect for any pipe
restrictions.
The internal condensate pump (if so equipped) runs when-
ever the reversing valve is energized (heat pump only) and/or
the unit is in cooling. As long as the condensate float switch
and freeze protection thermostat are closed, the cooling relays
in the fan coil unit will close. This energizes the compressor
and outdoor fan in the outdoor unit. The compressor will con-
tinue to operate until the room thermostat is satisfied. When the
cooling demand is satisfied, the compressor and outdoor fan
will stop. If the system is in the AUTO. position, the indoor fan
will stop with the compressor. If the unit has the accessory ven-
tilation kit, the ventilation fan will operate whenever the indoor
fan is set for medium or high speed.
HEAT PUMP OPERATION — When the room thermostat
senses a demand for heating the indoor fan will start in the
selected speed (if not already operating), and the reversing
valve will not be energized. The internal condensate pump (if
supplied) and freeze protection thermostat are not operated
during heating operation. The control relay (CR2) closes, and
the compressor and outdoor fan are energized through the de-
frost board (DFB), which is located in the outdoor unit. The
microprocessor logic in the DFB is energized when the com-
pressor starts, and the defrost timer runs. Once every 90 min-
utes (factory default setting) of compressor run time, the DFB
logic checks the defrost thermostat (DFT). If the DFT is open,
the unit continues in heating operation. If the DFT is closed, the
DFB switches the unit to defrost mode. The timing on the DFB
may be set at either 30, 50, or 90 minutes.
DEFROST (Heat Pump Only) — The DFB energizes the
RVS (reversing valve solenoid), and the reversing valve
switches to the cooling position. The K1 relay on the DFB
opens and the outdoor fan stops. The W2 contact on the DFB is
also energized, which in turn energizes the defrost relay on the
fan coil relay board, turns off the electric heater and stops the
indoor fan.
The DFB logic checks the 10-minute defrost timer and the
DFT. If the DFT opens in less than 10 minutes, the DFB
switches the unit back to normal heating operation. If the DFT
remains closed, the DFB switches the unit back to heating op-
eration after 10 minutes. When the DFB changes back to heat-
ing mode, the RVR (reversing valve relay) is deenergized and
the reversing valve switches back to heating operation. Both
the outdoor and indoor fans come back on, and if necessary, the
electric heater also turns on.
2. Make sure that all wiring connections are correct and
that they are tight.
3. Check that all barriers, covers, and panels are in place.
Ensure that the filters and return-air grilles have been
installed and that the discharge louvers are positioned
correctly.
After Extended Shutdown — If the system has been
turned off for more than 12 hours and a crankcase heater is be-
ing used, turn on the indoor and outdoor unit disconnect
switches to supply power to the system for 12 hours BEFORE
starting the system.
Seasonal Changeovers — When changing heat pump
system from cooling to heating or heating to cooling, or before
starting cooling only system after it has been out of use for the
winter season, perform the following steps BEFORE starting
the system:
1. Inspect and clean the outdoor unit, particularly the
coil.
2. Clean or replace the air filters in the indoor unit.
3. Clean the indoor unit drain pan and drain pipe, and
remove any obstructions.
4. If the outdoor unit is equipped with a crankcase heater,
turn on indoor and outdoor unit disconnect switches to
supply power to the system 12 hours before starting
the system.
Adjusting Airflow
AUTOMATIC AIR SWEEP — All units are equipped with
an air sweep feature which directs the airflow louvers up and
down to provide optimum room air circulation. The air sweep
function can be controlled by the toggle switch located on the
lower right corner of the unit. If using a thermostat with an air
sweep switch, see Fig. 20 and 21 for wiring modifications.
Operating Mode Memory — After the system is
turned off or after a power failure, the system remains in the
last operating mode selected. When the system is turned back
on, or when power is automatically restored, operation contin-
ues in the same operating mode as when the system shut down.
SYSTEM SAFETIES — The system is equipped with the
following safety devices to protect system components:
Indoor coil freeze protection thermostat — If a coil temper-
ature of 28 F or lower is sensed, the compressor and outdoor
fan will be shut down until the coil temperature exceeds 28 F.
The indoor fan will continue to run.
Automatic Operation (Auto.) Mode — If auto.
mode is selected, the system automatically switches over the
operating mode from heating to cooling, or from cooling to
heating (heat pump system only) depending on the selected
temperature. Auto. mode also controls fan speed if not manual-
ly overridden.
Condensate float switch (units equipped with accessory
condensate pump, cooling cycle only) — If the level of con-
densate in the drain pan rises too high, the condensate float
switch will turn the system off.
NOTE: Between the cooling cycle and the heating cycle there
is a neutral zone of approximately 2° F above and 2° F below
the selected temperature when only the fan is operating.
18
SPECIAL OPERATION, HEATING — Outdoor cooling units
may be matched with heat pump ceiling-suspended fan coil
units to provide supplemental electric heat. All other operation
is the same as a cooling-only system, except these units have
heating capability as follows:
When the room thermostat initiates a call for heating, the
electric heater is turned on. The indoor unit fan will start at the
same time, if it was not already running.
When the heating requirement is satisfied, the room thermo-
stat will open, and the heater will turn off.
CLEANING AND MAINTENANCE
Fig. 22 — Inserting Water into Drain Pan
To avoid the possibility of electric shock, before performing
any cleaning and maintenance operations, always turn off
power to the system by pressing the mode button on the
remote thermostat until the display shows “OFF,” and turn-
ing off the outdoor disconnect switch located near the out-
door unit. If the indoor unit is on a separate switch, be sure
to turn this disconnect off as well.
Air Filters (Fig. 23)
Operating the system with dirty air filters may damage the
indoor unit and, in addition, can cause reduced cooling per-
formance, intermittent system operation, frost build-up on
the indoor coil, and blown fuses. Inspect and clean or
replace the air filters monthly.
Do not wash filter in water over 120 F (to avoid shrinkage).
Do not expose filter to fire (to avoid fire damage). Do not
expose filter to direct sunlight. Clean filter more frequently
when air is extremely dirty.
REMOVE AIR FILTERS — Remove filters by pulling them
straight out.
CLEAN OR REPLACE FILTERS — Filters can be vacu-
umed or washed in warm water. Shake filter to remove any ex-
cess water, and replace by sliding filter behind grille until filter
snaps in place. Refer to Fig. 23.
For proper system operation, perform the cleaning and
maintenance operations in Table 6.
Lubrication — The indoor-fan, automatic air sweep, and the
outdoor-fan motors are factory lubricated and require no oiling.
If the filter has begun to break down or is torn, replace it.
Replacement filters are available through your dealer.
Table 6 — Cleaning and Maintenance Schedule
TASK
MONTHLY
QUARTERLY
YEARLY
INDOOR UNIT
Clean Air Filters
Clean Drain Pipe
X
X
Clean Condensate Drain Pan
Clean Indoor Coil
Clean Indoor Unit Front Panel
X
X
X
X
OUTDOOR UNIT
Clean the Fins From Outside
Open the Unit and Clean Fins Inside
Remove Dust From Electrical Parts
Check Electrical Connections are Tight
Clean Outdoor Fan
X
X
X
X
X
X
Clean Outdoor Coil
Check that Outdoor Fan Assembly is Tight
Clean Drain Pan
X
NOTE: Maintenance procedures for the outdoor units are in the individual unit installation instructions.
19
Clean Indoor Unit Bottom Panel — If the bottom panel
of the unit becomes dirty or smudged, wipe the outside of the
panel with a soft dry cloth. Use a mild liquid detergent and
wipe off carefully with a dry cloth.
Clean Indoor Coil — To clean the coil, remove indoor unit
bottom panel and vacuum the coil fins, using care not to bend
or damage fins.
Clean Outdoor Coil (Outdoor Unit)
Some metal parts and sharp fins of outdoor unit coil can
cause personal injury during cleaning. Clean coil carefully.
To clean the outdoor coil:
1. Remove any dirt or obstruction from discharge
opening.
2. Use a garden hose to spray water on the coil. Debris
that collects between coil fins inhibits heat transfer —
direct the water spray between coil fins to flush out
debris.
Fig. 23 — Cleaning Filters
Clean Condensate Drains — Clean all drains and drain
pans at the start of each cooling season. Check the flow by
pouring water into the drain.
Before Calling for Service — Save the cost of a service
call by doing the following:
CLEAN OR REPLACE DRAIN PAN
1. Be sure main power to system is turned on.
2. Press Mode button until OFF is displayed. Wait 5 min-
utes.
3. Press Mode button until either COOL or HEAT is dis-
played (as desired).
4. Adjust thermostat set point to desired room tempera-
ture. If system starts within a few minutes, service may
not be necessary. If system does not operate properly,
check Table 7 for typical solutions.
1. Place a plastic sheet on the floor to catch any water
that may spill from drain pan.
2. Remove the intake grille and distribution assembly
(attached).
3. Remove the condensate water in the drain pan by let-
ting water drain into a 3-gallon bucket.
Do not use a screwdriver to pry drain pan out of assembly
— it could damage the pan.
IF SYSTEM FAILS TO OPERATE — Be sure:
• unit ON/OFF switch is in ON position
• fuse or circuit breaker is not tripped
4. Remove the 4 screws holding the drain pan.
5. Carefully hold the drain pan to remove it from the
assembly.
FRESH AIR INSTALLATION OPTION
The units have an installation option, which allows for field
installation of fresh air ventilation. Plan the installation careful-
ly. Before beginning, measure carefully and follow acceptable
building practices, NEC, and local codes.
SERVICE
Ventilation-Air Accessory — Refer to ventilation air
accessory installation instructions.
When servicing unit, turn off all electric power to unit to
avoid shock hazard or injury from rotating parts.
TROUBLESHOOTING
If the under-ceiling fan coil unit fails to start or operate
properly, sometimes the problem is minor and can be handled
without a service call. Refer to Table 7 for some common prob-
lems, causes, and typical solutions. See Fig. 20 and 21 for addi-
tional system troubleshooting details. If the problem cannot be
corrected, contact a local dealer for further assistance.
Do not vent refrigerant to atmosphere when servicing unit.
Recover refrigerant during system repair or unit removal.
20
Table 7 — Troubleshooting
PROBLEM
CAUSE
TYPICAL SOLUTION
System Does Not Start.
Blown fuse or circuit breaker tripped at building
power entry.
Replace fuse or reset circuit breaker.*
Indoor and/or outdoor unit disconnect switch is off.
Thermostat is set to night mode.
Power failure.
Turn on disconnect switch(es).
Cancel mode using Day/Night button on thermostat.
Restore power.
Unit is in off mode.
Press Mode button on thermostat until thermostat
displays the desired unit mode.
Three-minute time delay is running.
Wait for 3 minutes.
Temperature is above or below the selected
temperature.
Select new temperature using the thermostat.
System Does Not Cool Properly. Air filter(s) in indoor unit is dirty or needs to be
Clean or replace air filter(s).
replaced.
Temperature is set too high or too low.
Reset temperature to desired comfort setting using
the thermostat.
Outdoor unit outdoor coil restricted.
Fan speed is set too low.
Remove obstruction.
Adjust fan speed to high or auto. using the Fan
button on the thermostat.
System Does not Heat Properly. Air filter(s) in indoor unit is dirty or needs to be
Clean or replace air filter(s).
replaced.
Temperature is set too high or too low.
Reset temperature to desired comfort setting using
the thermostat.
Outdoor unit outdoor coil restricted.
Fan speed is set too low.
Remove obstruction.
Adjust fan speed to high or auto. using the Fan
button on the thermostat.
Outdoor unit outdoor coil is frosted up.
Check manual defrost timer setting and adjust as
necessary.
Ice or frost has Formed
on Indoor Coil.†
Low outdoor-air temperature.
Air filter(s) in indoor unit is dirty or needs to be
replaced.
Run system in fan-only mode until frost is gone.
Clean or replace air filter(s).
Insufficient Airflow.
Air filter(s) in indoor unit is dirty or needs to be
replaced.
Fan coil unit coil is blocked.
Clean or replace air filter(s).
Clean air discharge louvers.
*If fuse blows or circuit breaker trips again after first start attempt, DO NOT attempt to start system again.
Contact your local dealer for assistance.
†When outdoor temperature is approximately 55 F or below, indoor coil frosting may occur when system is
operated in cooling or maximum dehumidification mode. Units are not intended to operate below 55 F
without appropriate accessories.
21
SERVICE TRAINING
START-UP CHECKLIST
Packaged Service Training programs are an excellent way to increase your knowledge of the equipment
discussed in this manual, including:
• Unit Familiarization
• Installation Overview
• Maintenance
• Operating Sequence
A large selection of product, theory, and skills programs are available, using popular video-based formats
and materials. All include video and/or slides, plus companion book.
Classroom Service Training which includes “hands-on” experience with the products in our labs can mean
increased confidence that really pays dividends in faster troubleshooting and fewer callbacks. Course
descriptions and schedules are in our catalog.
CALL FOR FREE CATALOG 1-800-644-5544
[
] Packaged Service Training
[
] Classroom Service Training
Copyright 2006 Carrier Corporation
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 02-40QA0007-SI Printed in U.S.A. Form 40QA-7SI Pg 22 706 3-06 Replaces: 40QA-5SI
Book 1
4
Tab 3d 2c
START-UP CHECKLIST
I. PRELIMINARY INFORMATION
OUTDOOR UNIT: MODEL NO. ___________________
INDOOR UNIT: MODEL NO. _____________________
SERIAL NO. ___________________________________
SERIAL NO. ___________________________________
ACCESSORIES: __________________________________________________________________________________
PISTONS: INDOOR SIZE: ____________
OUTDOOR SIZE: ____________
REFRIGERANT PIPING: EQUIVALENT LINE LENGTH: ____________
LIFT: FAN COIL ABOVE OUTDOOR UNIT? ____________
FAN COIL BELOW OUTDOOR UNIT? ____________
II. PRE-START-UP
INDOOR UNIT (REFER TO OUTDOOR UNIT INSTALLATION INSTRUCTIONS FOR OUTDOOR UNIT
PRE-START-UP FUNCTIONS)
IS THERE ANY SHIPPING DAMAGE? ____________
IF YES, WHERE? ____________________________________
WILL THIS DAMAGE PREVENT UNIT START-UP? ____________
IS POWER SUPPLY CORRECT? ____________
HAS GROUND WIRE BEEN CONNECTED? ____________
HAS THE CORRECT SIZE FUSE OR HACR BREAKER BEEN PROVIDED? ____________
ARE POWER WIRES TO THE UNIT SIZED AND INSTALLED PROPERLY? ____________
IS THE DISCONNECT SWITCH INSTALLED WITHIN SIGHT OF THE UNIT? ____________
IS THE LOW-VOLTAGE CABLE (INDOOR TO OUTDOOR UNIT) RUN AND CONNECTED PROPERLY? ____________
HAS CONDENSATE DRAIN BEEN RUN, SLOPED AND TRAPPED PROPERLY? ____________
IS FILTER(S) IN PLACE? ____________
IS UNIT MOUNTED LEVEL? ____________
IS HEATING PISTON INSTALLED (FIG. 13), THE CORRECT SIZE, AND IN THE CORRECT DIRECTION? ____________
III. PIPING
IS A LIQUID LINE SOLENOID INSTALLED IF REQUIRED BY LONG-LINE APPLICATIONS ? ____________
IS FILTER DRIER INSTALLED AT THE OUTDOOR UNIT? ____________
HAVE LEAK CHECKS BEEN MADE AT THE COMPRESSOR, OUTDOOR UNIT, FLARE CONNECTIONS, FILTER
DRIERS, AND FUSIBLE PLUGS WITH A LEAK DETECTOR?* ____________
*FIELD PIPING AND ALL TUBING CONNECTIONS MUST BE LEAK TESTED BY THE PRESSURE METHOD DE-
SCRIBED IN CARRIER GENERAL TRAINING FOR AIR CONDITIONING MANUAL (GTAC2), MODULE 5. USE R-22
AT APPROXIMATELY 25 PSIG BACKED UP WITH AN INERT GAS TO REACH A TOTAL SYSTEM PRESSURE NOT
TO EXCEED 245 PSIG.
CL-1
START-UP CHECKLIST (cont)
HAS PIPING SYSTEM BEEN EVACUATED TO 1000 MICRONS (IF REQUIRED)? ____________
HAS SYSTEM CHARGE BEEN WEIGHED IN (IF REQUIRED)? ____________
HAVE SERVICE VALVES BEEN FULLY BACKSEATED? ____________
CHECK VOLTAGE: IS VOLTAGE WITHIN RANGE SHOWN FOR UNIT (WITH UNIT OPERATING)?
OUTDOOR ____________
INDOOR ____________
IV. START-UP
IF UNIT HAS A CRANKCASE HEATER, HAS IT BEEN ON FOR 24 HOURS? ____________
MEASURE AND RECORD THE:
AIR ENTERING OUTDOOR UNIT: ____________ F
AIR ENTERING INDOOR UNIT: ____________ F
DISCHARGE LINE TEMPERATURE: ____________ F
VAPOR LINE TEMPERATURE: ____________ F
MEASURE AND RECORD THE:
VAPOR LINE PRESSURE: ____________ PSIG
DISCHARGE PRESSURE: ____________ PSIG
START-UP CHECKLIST
I. PRELIMINARY INFORMATION
OUTDOOR UNIT: MODEL NO.
INDOOR UNIT: MODEL NO.
SERIAL NO.
SERIAL NO.
ACCESSORIES: __________________________________________________________________________________
PISTONS (38HDC and 38QRC SYSTEMS ONLY): INDOOR SIZE: OUTDOOR SIZE
(38QRC SYSTEMS ONLY):
REFRIGERANT PIPING: EQUIVALENT LINE LENGTH:
(IF OVER 50 FT)*
LIFT: FAN COIL ABOVE OUTDOOR UNIT (IF OVER 25 FT)*?
FAN COIL BELOW OUTDOOR UNIT (IF OVER 25 FT)*?
*APPLIES ONLY TO 38HDC AND 38QRC UNITS USING LONG-LINES APPLICATIONS. MAXIMUM EQUIVALENT
LINE LENGTH FOR 38HDS SYSTEMS IS 50 FT. MAXIMUM LIFT ON 38HDS APPLICATIONS IS 30 FT FROM LOW-
EST SYSTEM POINT TO HIGHEST SYSTEM POINT.
PRE-START-UP
INDOOR UNIT (REFER TO OUTDOOR UNIT INSTALLATION INSTRUCTIONS FOR OUTDOOR UNIT PRE-START-UP
FUNCTIONS)
IS THERE ANY SHIPPING DAMAGE?
IF YES, WHERE?
WILL THIS DAMAGE PREVENT UNIT START-UP?
IS POWER SUPPLY CORRECT?
(115-V FOR 40QAB024-048, 115 V UNITS; OR 208/230 V FOR 40QAB024-
048, 208/230 V UNITS AND ALL 40QAB060 AND 40QAE024-060 UNITS. ALL SYSTEMS REQUIRE SINGLE-PHASE
POWER)
HAS GROUND WIRE BEEN CONNECTED?
HAS THE CORRECT SIZE FUSE OR HACR BREAKER BEEN PROVIDED? ARE POWER WIRES
TO THE UNIT SIZED AND INSTALLED PROPERLY? IS THE DISCONNECT SWITCH IN-
STALLED IN SIGHT FROM THE UNIT?
IS THE LOW-VOLTAGE CABLE (INDOOR TO OUTDOOR UNIT) RUN AND CONNECTED PROPERLY?
Copyright 2006 Carrier Corporation
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1
4
Catalog No. 02-40QA0007-SI
Printed in U.S.A.
Form 40QA-7SI
Pg CL-2
706
3-06 Replaces: 40QA-5SI
Tab 3d 2c
|