Lennox International Inc Air Conditioner 2SCU13 User Manual

INSTALLATION AND MAINTENANCE  
INSTRUCTIONS  
2SCU13 Series  
Split System Air Conditioner  
WARNING  
The equipment covered in this manual is to be installed by trained and experienced  
service and installation technicians. Improper installation, modification, service, or  
use can cause electrical shock, fire, explosion, or other conditions which may cause  
personal injury, death, or property damage. Use appropriate safety gear including  
safety glasses and gloves when installing this equipment.  
WARNING  
TABLE OF CONTENTS  
Risk of electrical shock. Disconnect all  
remote power supplies before installing or  
INSTALLATION ...................................... 2  
servicing any portion of the system. Failure  
to disconnect power supplies can result in  
property damage, personal injury, or death.  
OPERATION ........................................ 14  
START-UP............................................ 10  
MAINTENANCE ................................... 14  
WARNING  
Installation and servicing of air conditioning  
equipment can be hazardous due to internal  
refrigerant pressure and live electrical com-  
ponents. Only trained and qualified service  
personnel should install or service this equip-  
ment. Installation and service performed by  
unqualified persons can result in property  
damage, personal injury, or death.  
CONNECTION DIAGRAMS ................. 16  
WARRANTY......................................... 18  
Manufactured By  
A.A.C.  
A Lennox International Inc. Company  
421 Monroe Street  
Bellevue, OH 44811  
WARNING  
Sharp metal edges can cause injury. When  
installing the unit, use care to avoid sharp  
edges.  
*48283B006*  
Save these instructions for future reference  
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1. Install line voltage power supply to unit from a properly  
sized disconnect switch. Any excess high voltage field  
wiring should be trimmed or secured away from the  
low voltage field wiring.  
Slab Mounting  
Discharge Air  
Building  
Structure  
2. Ground unit at unit disconnect switch or to an earth  
ground. To facilitate conduit, a hole is in the bottom of  
the control box. Connect conduit to the control box using  
a proper conduit fitting. Units are approved for use only  
with copper conductors. 24V Class II circuit connections  
are made to the low voltage pigtails. A complete unit  
wiring diagram is located inside the unit control box  
cover (see also pages 16 and 17 of this instruction).  
Mounting Slab  
Ground Level  
3. Install room thermostat on an inside wall that is not  
subject to drafts, direct sunshine, or other heat sources.  
2° or 2" per 5' slope tolerance away from building  
structure.  
4. Install low voltage wiring from outdoor to indoor unit and  
from thermostat to indoor unit (see Figure 4).  
Figure 2  
5. Do not bundle any excess 24V control wire inside control  
box. Run control wire through installed wire tie and tighten  
wire tie to provide low voltage strain relief and to maintain  
separation of field-installed low and high voltage circuits.  
Wind Barrier Construction  
Prevailing Winter Winds  
Thermostat Designations  
Wind Barrier  
Inlet Air  
24"  
Thermostat  
Indoor Unit  
Power  
Heat  
Outdoor  
Unit  
R
R
W
Y
W1  
Inlet Air  
Cooling  
Y1 Outdoor Unit  
Y
Indoor Blower  
G
C
G
C
C Outdoor Unit  
Inlet Air  
Figure 3  
See unit wiring diagram for power supply connections.  
If the indoor unit is not equipped with a blower relay,  
one must be field supplied and installed.  
Electrical Wiring  
Do not connect C (common) connection between  
indoor unit and thermostat except when required by  
the indoor thermostat. Refer to thermostat installation  
instructions. C (common) connection between indoor  
unit and outdoor unit required for proper operation.  
All field wiring must be done in accordance with the  
National Electrical Code (NEC) recommendations,  
Canadian Electrical Code (CEC) and CSA Standards, or  
local codes, where applicable.  
WARNING  
Figure 4  
Unit must be grounded in accordance with  
national and local codes. Failure to ground unit  
properly can result in personal injury or death.  
Refrigerant Piping  
Field refrigerant piping consists of liquid and suction lines  
from the outdoor unit (sweat connections) to the indoor  
coil (flare or sweat connections).  
Refer to the furnace or blower coil Installation Instructions  
for additional wiring application diagrams and refer to unit  
rating plate for minimum circuit ampacity and maximum  
overcurrent protection size.  
Select line set diameters from Table 2 on page 4 to  
ensure that oil returns to the compressor. Size vertical  
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suction riser to maintain minimum velocity at minimum  
capacity. Recommended line length is 50' or less. If more  
than 50' line set is required, contact Technical Services at  
(419) 483-4840.  
energy or vibration can be expected. Close attention to  
line set isolation must be observed.  
Following are some points to consider when placing and  
installing a high-efficiency outdoor unit:  
Table 2 shows the diameters for line sets up to 100'  
although vertical lift applications and trapping require-  
ments need to be reviewed with Technical Services for  
line sets over 50'.  
Placement  
Be aware that some localities are adopting sound ordinances  
based on how noisy the unit is at the neighbor’s home, not at  
the original installation. Install the unit as far as possible from  
the property line. When possible, do not install the unit  
directly outside a bedroom window. Glass has a very high  
level of sound transmission. Figure 5 shows how to place the  
outdoor unit and line set to reduce line set vibration.  
Refrigerant Line Set Diameters (in.)  
Liquid Line  
Line Set Length and Size  
BTUH  
12 ft. 25 ft. 50 ft. 75 ft. 100 ft.  
Outside Unit Placement  
and Installation  
18,000 3/8  
24,000 3/8  
30,000 3/8  
36,000 3/8  
42,000 3/8  
48,000 3/8  
60,000 3/8  
3/8  
3/8  
3/8  
3/8  
3/8  
3/8  
3/8  
3/8  
3/8  
3/8  
3/8  
3/8  
3/8  
3/8  
3/8  
3/8  
3/8  
3/8  
1/2  
1/2  
1/2  
3/8  
3/8  
1/2  
1/2  
1/2  
1/2  
1/2  
Install unit away  
from windows  
Suction Line  
Line Set Length and Size  
12 ft. 25 ft. 50 ft. 75 ft. 100 ft.  
BTUH  
Two 90° elbows installed in lineset  
will reduce lineset vibration  
18,000 3/4  
24,000 3/4  
30,000 3/4  
36,000 7/8  
42,000 7/8  
48,000 7/8  
3/4  
3/4  
3/4  
7/8  
7/8  
7/8  
3/4  
3/4  
3/4  
7/8  
7/8  
7/8  
3/4  
3/4  
7/8  
7/8  
3/4  
7/8  
Figure 5  
7/8  
Line Set Isolation  
1-1/8  
1-1/8 1-1/8  
1-1/8 1-1/8  
Illustrations on the following pages demonstrate proce-  
dures which ensure proper refrigerant line set isolation.  
Figure 6 shows how to install line sets on horizontal runs.  
Figure 7 shows how to make a transition from horizontal  
to vertical. Figure 8 on page 6 shows how to install line  
sets on vertical runs.  
60,000 1-1/8 1-1/8 1-1/8 1-1/8 1-1/8  
For installations exceeding 50', contact  
Technical Services at (419) 483-4840.  
Brazing Connection Procedure  
Table 2  
1. Cut ends of refrigerant lines square (free from nicks  
or dents). Debur the ends. The pipe must remain  
round; do not pinch end of line.  
Installing Refrigerant Line  
During the installation of an air conditioning system, it is  
important to properly isolate the refrigerant line to prevent  
unnecessary vibration. Line set contact with the structure  
(wall, ceiling, or floor) may cause objectionable noise  
when vibration is translated into sound. As a result, more  
2. Before making line set connections, use dry nitrogen to  
purge the refrigerant piping. This will help to prevent  
oxidation and the introduction of moisture into the system.  
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Refrigerant Line Sets: Installing Horizontal Runs  
To hang line set from joist or rafter,  
use either metal strapping material  
or anchored heavy nylon wire ties.  
Wire Tie  
(around vapor line only)  
8  
Strapping Material  
(around vapor line only)  
Floor Joist or  
Roof Rafter  
Tape or Wire Tie  
8’  
Strap the vapor line to the joist or rafter  
at 8intervals then strap the liquid line  
to the vapor line.  
Metal Sleeve  
Floor Joist or Roof Rafter  
Tape or Wire Tie  
Figure 6  
Refrigerant Line Sets: Transition from Vertical to Horizontal  
Automotive  
Muffler-Type  
Hanger  
Anchored  
Heavy Nylon  
Wire Tie  
Strap Liquid  
Line to Vapor  
Line  
Strap Liquid  
Line to Vapor  
Line  
Wall  
Stud  
Wall  
Stud  
Liquid Line  
Liquid Line  
Vapor Line Wrapped  
Vapor Line Wrapped  
Metal Sleeve  
in Armaflex  
Metal Sleeve  
in Armaflex  
Figure 7  
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Refrigerant Line Sets: Installing Vertical Runs (new construction shown)  
IMPORTANT: Refrigerant  
lines must not contact wall.  
Outside Wall  
Vapor Line  
Liquid Line  
NOTE: Similar installation practices  
should be used if line set is to be  
installed on exterior of outside wall.  
Wood Block  
Between Studs  
Wire Tie  
Inside Wall  
Strap  
Sleeve  
Vapor Line Wrapped  
with Armaflex  
Wire Tie  
Liquid Line  
Outside Wall  
Wood Block  
IMPORTANT:  
Refrigerant  
lines must not  
contact structure.  
Wire Tie  
Strap  
Caulk  
Fiberglass  
PVC Pipe  
Insulation  
Sleeve  
Figure 8  
3. Use silver alloy brazing rods (5% or 6% silver alloy for  
copper-to-copper brazing or 45% silver alloy for  
copper-to-brass or copper-to-steel brazing) which are  
rated for use with HCFC-22 refrigerant.  
Refrigerant Metering Device  
2SCU13 units are designed for use with either fixed orifice  
or TXV systems. Refer to the appropriate following section  
for information on installing the chosen refrigerant meter-  
ing device.  
4. Remove the Schrader core assemblies before brazing  
to protect them from damage due to extreme heat.  
Replace the cores when brazing is complete.  
Fixed Orifice Systems  
5. Wrap a wet cloth around the valve body and copper tube  
stub to protect them from heat damage during brazing.  
2SCU13 units are shipped with a fixed orifice refrigerant  
metering device. Replace the existing indoor unit fixed  
orifice with the orifice supplied with this unit. Place the  
supplied fixed orifice sticker on the indoor cabinet after  
installation. See Table 3 for the proper fixed orifice size for  
each unit. In nonstandard applications, the provided fixed  
orifice may not be appropriately sized.  
6. Braze the line set to the service valve. Quench the joints  
with water or a wet cloth to prevent heat damage to the  
valve core and opening port. The tube end must stay  
bottomed in the fitting during final assembly to  
ensure proper seating, sealing, and rigidity.  
Install the fixed orifice as shown in Figure 9. Do not twist cap  
tubes when loosening the seal nut from the orifice housing.  
Use wrench to back up the distributor.  
7. Install the factory-supplied fixed orifice (or thermal  
expansion valve which is sold separately and which is  
approved for use with HCFC-22 refrigerant) in the  
liquid line at the indoor coil.  
Expansion Valve Systems  
Expansion valves equipped with Chatleff-type fittings are  
available from the manufacturer. See Table 4 for proper  
TXV for each unit.  
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the expansion valve along with a new teflon seal into the  
distributor and tighten to 20 – 30 ft. lbs. Use backup  
wrench on all wrench flats. Overtightening will crush  
the teflon seal and may cause a leak.  
Fixed Orifice Data  
Part  
Number  
Drill  
Size  
Model  
2. Attach liquid line portion of distributor assembly along  
with new teflon seal to the inlet of the expansion  
valve. Tighten to 20 – 30 ft. lbs. Use backup wrench  
on all wrench flats. Overtightening will crush the  
teflon seal and may cause a leak.  
2SCU13-18  
2SCU13-24  
2SCU13-30  
2SCU13-36  
2SCU13-42  
2SCU13-48  
2SCU13-60  
100484-07  
100484-12  
100484-19  
100484-24  
100484-30  
100484-38  
100484-45  
.053  
.062  
.070  
.076  
.082  
.091  
.099  
3. Connect the external equalizer line to the equalizer  
port on the suction line and tighten to 8 ft. lbs.  
4. Strap the superheat sensing bulb to the suction header.  
If installing an expansion valve on an indoor coil that  
previously used a fixed orifice, be sure to remove the  
existing fixed orifice. Failure to remove a fixed orifice  
when installing an expansion valve to the indoor coil will  
result in improper operation and damage to the system.  
Table 3  
Manifold Gauge Set  
Metering Device Installation  
When checking the unit charge, use a manifold gauge set  
that is equipped with “low loss” hoses. Do not use a manifold  
gauge set with anything other than a “low loss” hose.  
Liquid and Suction Line Service Valves  
The liquid line and suction line service valves and service  
ports are used for leak testing, evacuating, charging, and  
checking charge.  
Each valve is equipped with a service port which has a  
factory-installed Schrader valve (see Figure 10 on page 8).  
A service port cap protects the Schrader valve from con-  
tamination and serves as the primary leak seal.  
Figure 9  
To Access the Schrader Port:  
1. Remove the service port cap with an adjustable wrench.  
2. Connect gauge to the service port.  
TXV Data  
Part  
Number  
Model  
3. When testing is completed, replace service port cap.  
Tighten finger tight, then an additional 1/6 turn.  
2SCU13-18, -24, -30, -36  
2SCU13-42, -48  
2SCU13-60  
26K34  
26K35  
91M01  
To Open Liquid or Suction Line Service Valve:  
1. Remove stem cap with an adjustable wrench.  
2. Use a service wrench with a hex-head extension to  
back the stem out counterclockwise as far as it will  
go. Use a 3/16" hex head extension for liquid line  
service valves and a 5/16" extension for suction line  
service valves.  
Table 4  
To install an expansion valve (see Figure 9):  
1. Separate the distributor assembly and remove the  
piston orifice and used teflon seal. Insert nozzle end of  
3. Replace the stem cap. Tighten finger tight, then  
tighten an additional 1/6 turn.  
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Ball Type Service Valve  
(Valve Open)  
Service Valve  
Valve Closed  
Use adjustable wrench. To open, rotate stem  
counterclockwise 1/4 turn (90°). To close, rotate  
stem clockwise 1/4 turn (90°).  
Figure 11  
Leak Testing  
After the line set has been connected to the indoor and  
outdoor units, the line set connections and indoor unit  
must be checked for leaks.  
Valve Open  
WARNING  
Figure 10  
Refrigerant can be harmful if inhaled. Refrigerant  
must always be used and recovered responsibly.  
Incorrect or irresponsible use of refrigerant can  
result in personal injury or death.  
To Close Liquid or Suction Line Service Valve:  
1. Remove the stem cap with an adjustable wrench.  
2. Use a service wrench with a hex-head extension to turn  
the stem clockwise to seat the valve. Tighten firmly.  
WARNING  
3. Replace the stem cap. Tighten finger tight, then  
tighten an additional 1/6 turn.  
Never use oxygen to pressurize refrigeration  
or air conditioning systems. Oxygen will ex-  
plode on contact with oil and could cause  
personal injury or death.  
Suction Line (Ball Type) Service Valve  
Suction line (ball type) service valves function the same  
way as the other valves; the difference is in the construc-  
tion (see Figure 11).  
Using an Electronic Leak Detector  
The ball valve is equipped with a service port with a  
factory-installed Schrader valve. A service port cap  
protects the Schrader valve from contamination and  
serves as the primary seal.  
1. Connect the high pressure hose of the manifold  
gauge set to the suction valve service port. (Normally  
the high pressure hose is connected to the liquid line  
port; however, connecting it to the suction ports helps  
to protect the manifold gauge set from damage  
caused by high pressure.)  
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2. With both manifold valves closed, connect the cylin-  
der of HCFC-22 refrigerant. Open the valve on the  
HCFC-22 cylinder (vapor only).  
5. Evacuate the line set and indoor unit to a minimum of 500  
microns or lower. During the early stages of evacuation, it  
is desirable to close the manifold gauge valve at least  
once to determine if there is a rapid rise in pressure. A  
rapid rise in pressure indicates a relatively large leak. If  
this occurs, the leak testing procedure must be repeated.  
3. Open the high pressure side of the manifold to allow  
HCFC-22 into the line set and indoor unit. Weigh in a  
trace amount of HCFC-22. (A trace amount is a  
maximum of 2 oz. of refrigerant or 3 lbs. pressure.)  
Close the valve on the HCFC-22 cylinder and the  
valve on the high pressure side of the manifold gauge  
set. Disconnect the HCFC-22 cylinder.  
6. When 500 microns or lower is maintained, close the  
manifold gauge valves, turn off the vacuum pump, and  
disconnect the manifold gauge center port hose from  
the vacuum pump. Attach the manifold gauge center  
port hose to a nitrogen cylinder with pressure regulator  
set to 150 psig and purge the hose. Open the manifold  
gauge valves to break the vacuum in the line set and  
indoor unit. Close the manifold gauge valves.  
4. Connect a cylinder of nitrogen with a pressure regulat-  
ing valve to the center port of the manifold gauge set.  
When using high pressure gas such as nitrogen  
for this purpose, be sure to use a regulator that  
can control the pressure down to 1 or 2 psig.  
7. Shut off the nitrogen cylinder and remove the manifold  
gauge hose from the cylinder. Open the manifold  
gauge valves to release the nitrogen from the line set  
and indoor unit.  
5. Adjust nitrogen pressure to 150 psig. Open the valve  
on the high side of the manifold gauge set to pressur-  
ize the line set and the indoor coil.  
8. Reconnect the manifold gauge to the vacuum pump,  
turn the pump on, and continue to evacuate the line  
set and indoor unit until 500 microns is maintained  
within a 20-minute period after shutting off the  
Evacuation  
Evacuating the system of noncondensables is critical for  
proper operation of the unit. Noncondensables are defined  
as any gas that will not condense under temperatures and  
pressures present during operation of an air conditioning  
system. Noncondensables and water vapor combine with  
refrigerant to produce substances that corrode copper  
piping and compressor parts.  
vacuum pump and closing the manifold gauge valves.  
9. When the requirements above have been met,  
disconnect the manifold hose from the vacuum pump.  
Open the service valves to break the vacuum in the  
line set and indoor unit.  
WARNING  
Do not use a compressor to evacuate a sys-  
tem. Avoid deep vacuum operation. Extremely  
low vacuums can cause internal arcing and  
compressor failure. Danger of equipment  
damage. Damage caused by deep vacuum  
operation will void warranty.  
Use a thermocouple or thermistor electronic vacuum  
gauge that is calibrated in microns. Use an instrument that  
reads down to 50 microns.  
1. Connect the manifold gauge set to the service valve  
ports as follows:  
Low pressure gauge to suction line service valve  
High pressure gauge to liquid line service valve  
2. Connect micron gauge.  
3. Connect the vacuum pump (with vacuum gauge) to  
the center port of the manifold gauge set.  
4. Open both manifold valves and start vacuum pump.  
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If the system is void of refrigerant, clean the system using  
the procedure described below.  
START-UP  
CAUTION  
1. Use dry nitrogen to pressurize the system and check  
for leaks. Repair leaks, if possible.  
If unit is equipped with a crankcase heater, it  
should be energized 24 hours before unit  
start-up to prevent compressor damage as a  
result of slugging.  
2. Evacuate the system to remove as much of the  
moisture as possible.  
3. Use dry nitrogen to break the vacuum.  
4. Evacuate the system again.  
1. Rotate fan to check for frozen bearings or binding.  
2. Inspect all factory and field-installed wiring for loose  
connections.  
5. Weigh the appropriate amount of HCFC-22 refrigerant  
(listed on unit nameplate) into the system.  
3. After evacuation is complete, open liquid line and  
suction line service valves to release refrigerant  
charge (contained in outdoor unit) into system.  
6. Monitor the system to determine the amount of  
moisture remaining in the oil. Use a test kit to verify  
that the moisture content is within the kit’s dry color  
range. It may be necessary to replace the filter drier  
several times to achieve the required dryness level. If  
system dryness is not verified, the compressor  
will fail in the future.  
4. Replace the stem caps and secure finger tight, then  
tighten an additional 1/6 of a turn.  
5. Check voltage supply at the disconnect switch. The  
voltage must be within the range listed on the unit  
nameplate. If not, do not start equipment until the  
power company has been consulted and the voltage  
condition corrected.  
The outdoor unit should be charged during warm weather.  
However, applications arise in which charging must occur  
in the colder months. The method of charging is deter-  
mined by the unit’s refrigerant metering device and the  
outdoor ambient temperature.  
6. Set thermostat for cooling demand, turn on power to  
indoor blower and close the outdoor unit disconnect  
switch to start the unit.  
Measure the liquid line temperature and the outdoor  
ambient temperature as outlined below:  
7. Recheck unit voltage with unit running. Power must be  
within range shown on unit nameplate.  
1. Connect the manifold gauge set to the service valve  
ports as follows:  
Refrigerant Charging  
Low pressure gauge to suction line service valve  
High pressure gauge to liquid line service valve  
Units are factory charged with the amount of HCFC-22  
refrigerant indicated on the unit rating plate. This charge is  
based on a matching indoor coil and outdoor coil with 15'  
line set. For varying lengths of line set, refer to Table 5 for  
refrigerant charge adjustment.  
2. Close manifold gauge set valves. Connect the center  
manifold hose to an upright cylinder of HCFC-22.  
3. If room temperature is below 70°F, set the room thermo-  
stat to call for heat. This will create the necessary load  
for properly charging the system in the cooling cycle.  
Refrigerant Charge Adjustment  
4. Use a digital thermometer to record the outdoor  
ambient temperature.  
Liquid Line Set  
Diameter  
Oz. per 5 ft. adjust  
from 15 ft. line set*  
5. When the heating demand has been satisfied, switch  
the thermostat to cooling mode with a set point of  
68°F. When pressures have stabilized, use a digital  
thermometer to record the liquid and suction line  
temperatures.  
3/8 in.  
3 oz. per 5 ft.  
* If line length is greater than 15 ft., add this amount.  
If line length is less than 15 ft., remove this amount.  
6. The outdoor temperature will determine which charg-  
ing method to use. Proceed with the appropriate  
charging method.  
Table 5  
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Charge Using Weigh-In Method (Fixed Orifice/TXV  
Systems)  
Subcooling Values for  
Fixed Orifice or TXV Systems  
If the system is void of refrigerant, or if the outdoor ambient  
temperature is cool, first locate and repair any leaks then  
use the weigh-in method to charge the unit.  
Outdoor  
Liquid Subcooling ( 1°F)  
Temp.  
°F  
1. Recover the refrigerant from the unit.  
-18 -24 -30 -36 -42 -48 -60  
65  
75  
13 13  
10 11  
7
5
5
4
3
2
14 15  
13 13  
11 11  
9
9
9
9
9
8
13  
12  
11  
10  
9
2. Conduct a leak check, then evacuate as previously  
outlined.  
85  
8
7
6
3
10  
10  
9
3. Weigh in the charge according to the total amount  
shown on the unit nameplate.  
95  
9
8
6
9
7
5
105  
115  
If weighing facilities are not available or if unit is being  
charged during warm weather, follow one of the other  
procedures outlined below.  
6
8
Charge Using Subcooling Method (Fixed Orifice/TXV  
Systems) – Outdoor Temperatures 65°F or Above  
Table 6  
3. Use a temperature/pressure chart for HCFC-22 to  
determine the saturation temperature for the suction  
line pressure reading.  
If charging a fixed orifice or TXV system when the outdoor  
ambient temperature is 65°F or above, the subcooling  
method can be used to charge the unit.  
4. Subtract the saturation temperature (according to the  
chart) from the suction line temperature to determine  
the superheat.  
1. With the manifold gauge hose on the liquid service  
port and the unit operating stably, use a digital ther-  
mometer to record the liquid line temperature.  
_____ ° Suction Line Temperature °F  
2. At the same time, record the liquid line pressure reading.  
_____ ° Saturation Temperature °F  
3. Use a temperature/pressure chart for HCFC-22 to  
determine the saturation temperature for the liquid line  
pressure reading.  
=
_____ ° Superheat Value °F  
5. Compare the superheat value with those shown in  
Table 7 on page 12. If superheat is greater than  
shown, add some refrigerant. If superheat is less than  
shown, recover some refrigerant.  
4. Subtract the liquid line temperature from the satura-  
tion temperature (according to the chart) to determine  
subcooling.  
_____ ° Saturation Temperature °F  
Charge Using Approach Method (TXV Systems)  
– Outdoor Temperatures 65°F or Above  
_____ ° Liquid Line Temperature °F  
=
The following procedure is intended as a general guide  
and is for use on expansion valve systems only. For best  
results, indoor temperature should 70°F to 80°F. Monitor  
system pressures while charging.  
_____ ° Subcooling Value °F  
5. Compare the subcooling value with those shown in  
Table 6. If subcooling is greater than shown, recover  
some refrigerant. If subcooling is less than shown,  
add some refrigerant.  
1. Record outdoor ambient temperature using a digital  
thermometer.  
Charge Using Superheat Method (Fixed Orifice  
Systems) – Outdoor Temperatures 65°F or Above  
2. Attach high pressure gauge set and operate unit for  
several minutes to allow system pressures to stabilize.  
1. With the manifold gauge hose on the suction service  
port and the unit operating stably, use a digital ther-  
mometer to record the suction line temperature.  
3. Compare stabilized pressures with those provided in  
Table 9 on page 13. Minor variations in these pres-  
sures may be expected due to differences in installa-  
tions. Significant differences could mean that the  
system is not properly charged or that a problem  
exists with some component in the system.  
2. At the same time, record the suction line pressure  
reading.  
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Superheat Values for  
Fixed Orifice Systems  
(80°DB/67°WB Return Air)  
Approach Values for TXV Systems  
Model -18 -24 -30 -36 -42 -48 -60  
Outdoor Ambient Temp.  
°F  
Superheat  
Temp.  
°F  
6
10 11  
9
5
5
8
°F  
60  
65  
38  
35  
30  
26  
22  
18  
12  
8
Approach value is the liquid line temperature  
minus the outdoor ambient temperature (±1°F).  
NOTE: For best results, use the same digital  
thermometer to check both outdoor ambient and  
liquid temperatures.  
70  
75  
80  
Table 8  
85  
90  
95  
100  
105  
5
0
Table 7  
Pressures higher than those listed indicate that the  
system is overcharged. Pressures lower than those  
listed indicate that the system is undercharged. Verify  
adjusted charge using the approach method.  
4. Use the same digital thermometer to check liquid line  
temperature.  
5. Subtract the outdoor ambient temperature from the  
liquid line temperature to determine the approach  
temperature.  
_____ ° Liquid Line Temperature °F  
=
_____ ° Outdoor Ambient Temperature °F  
_____ ° Approach Temperature °F  
6. Compare the approach value with those shown in  
Table 8. If the values to do not agree with those  
provided in Table 8, add refrigerant to lower the  
approach temperature or recover refrigerant from the  
system to increase the approach temperature.  
Check Charge Using Normal Operating Pressures  
Use Table 9 to perform maintenance checks. Table 9 is  
not a procedure for charging the system. Minor variations  
in these pressures may be due to differences in installa-  
tions. Significant deviations could mean that the system is  
not properly charged or that a problem exists with some  
component in the system.  
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Normal Operating Pressures  
Model  
Outdoor Coil  
Entering Air  
Temperature  
-18  
-24  
-30  
-36  
-42  
-48  
-60  
L
S
L
S
L
S
L
S
L
S
L
S
L
S
Expansion Valve (TXV)  
141 80 147 79 141 76 145 74 143 78 145 80  
65°F  
75°F  
151 76  
166 81 173 80 167 77 170 76 167 80 170 81 177 78  
195 82 218 82 195 78 201 77 198 81 198 82 207 79  
222 83 234 82 227 80 234 78 231 82 230 84 240 80  
85°F  
95°F  
105°F  
115°F  
258 85 267 84 260  
81 268 79 268 84 265 85 277  
81  
294 86 307 85 299 83 309 81 308 85 303 86 318 83  
Fixed Orifice (RFC)  
65°F  
75°F  
144 73 147 68 140 66 150 67 147 70 145 70 150 67  
167 78 173 74 166 71 176 72  
196 82 203 79 196 76 205 76 198 78 198 80 207 77  
225 84 238 83 227 80 237 79 228 81 230 84 239 80  
256 86 272 86 262 83 273 81 262 84 264 86 274 83  
293 88 317 88 302 86 314 84 300 85 301 88 315 85  
171 75 170 75 177 72  
85°F  
95°F  
105°F  
115°F  
L – Liquid S – Suction  
Values provided above are typical pressures. Indoor unit matchup, indoor air quality, and indoor load will cause  
pressures to vary.  
Table 9  
# 48283B006  
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OPERATION  
MAINTENANCE  
WARNING  
Outdoor unit and indoor blower cycle on demand from the  
room thermostat. When the thermostat blower switch is  
moved to the ON position, the indoor blower operates  
continuously.  
Before performing maintenance operations on  
system, turn the electric power to unit OFF at  
disconnect switch(es). Unit may have multiple  
power supplies. Electrical shock could cause  
personal injury or death.  
Maintenance and service must be performed by a quali-  
fied installer or service agency.  
At the beginning of each cooling season, the system  
should be checked as follows:  
1. Clean and inspect condenser coil. Coil may be  
flushed with a water hose. Be sure the power is off  
before using water to clean the coil.  
2. Outdoor fan motor is pre-lubricated and sealed. No  
further lubrication is needed.  
3. Visually inspect connecting lines and coils for evi-  
dence of oil leaks.  
4. Check wiring for loose connections.  
5. Check for correct voltage at unit (with unit operating).  
6. Check amp-draw outdoor fan motor.  
Unit nameplate _________ Actual _________  
NOTE – If owner complains of insufficient cooling, the  
unit should be gauged and refrigerant charge checked.  
Refer to the Refrigerant Charging section on page 10.  
Indoor Coil  
1. Clean coil, if necessary.  
2. Check connecting lines and coils for evidence of oil  
leaks.  
3. Check condensate pan line and clean, if necessary.  
Indoor Unit  
1. Clean or change filters.  
2. Adjust blower speed for cooling. Measure the pressure  
drop over the coil to determine the correct blower CFM.  
3. Belt drive blowers: Check belt for wear and proper  
tension.  
4. Check all wiring for loose connections.  
# 48283B006  
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5. Check for correct voltage at unit (with unit operating).  
6. Check amp-draw on blower motor.  
Unit nameplate _________ Actual _________  
Start-Up and Performance Checklist  
Job Name _______________________________  
Job Location _____________________________  
Installer _________________________________  
Job No. ________________  
City ___________________  
City ___________________  
Date ______________  
State ______________  
State ______________  
Unit Model No.______________  
Serial No. ___________________  
Service Technician ________________________________________  
Nameplate Voltage ______________  
Outdoor Fan ___________________  
Rated Load Ampacity ________  
Compressor _______________  
Maximum Fuse or Circuit Breaker________________________  
Electrical Connections Tight?  
Indoor Filter Clean?  
Supply Voltage (Unit Off) ________________  
Indoor Blower RPM _____________  
S.P. Drop Over Indoor (Dry) ____________  
Voltage with Compressor Operating _____________  
Vapor Pressure ____________  
Outdoor Coil Entering Air Temperature _____________  
Discharge Pressure___________  
Refrigerant Charge Checked?  
Refrigerant Lines: Leak Checked?  
Service Valves: Fully Opened?  
Outdoor Fan Checked?  
Properly Insulated?  
Caps Tight?  
Thermostat: Calibrated?  
Properly Set?  
Level?  
# 48283B006  
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OUTDOOR  
FAN  
DUAL  
A4  
CAPACITOR  
TIMED OFF  
CONTROL  
(IF USED)  
PURPLE  
BLACK  
C
F
H
TO 24 VAC  
POWER SOURCE  
20 VA MINIMUM  
NEC CLASS 2  
ORANGE  
3
2
1
RED  
YELLOW  
Y1  
C
BLACK  
R
S
C
COMPRESSOR  
CONTACTOR  
CRANKCASE HEATER  
(IF USED)  
COMPRESSOR  
L2  
L1  
GROUND  
LUG  
208-230/60/1  
GROUND  
BLACK  
L1  
C
S
R
1
K1-1  
B1  
S4 HIGH  
S24 LOSS  
OF CHARGE  
SWITCH  
208-230/60/1  
L2  
YELLOW  
RED  
PRESSURE  
SWITCH  
(IF USED)  
(IF USED)  
ORANGE  
BLACK  
A4  
S24  
S4  
2
3
1
HR1  
K1  
H
C
F
EQUIPMENT  
GROUND  
B4  
PURPLE  
C12  
C
Y1  
TO 24 VAC  
POWER SOURCE  
20 VA MINIMUM  
NEC CLASS 2  
FOR USE WITH COPPER CONDUCTORS ONLY. REFER TO UNIT RATING  
PLATE FOR MINIMUM CIRCUIT AMPACITY AND MAXIMUM OVERCURRENT  
PROTECTION SIZE.  
1
WARNING--  
DESCRIPTION  
ELECTRIC SHOCK HAZARD, CAN CAUSE INJURY OR DEATH.  
UNIT MUST BE GROUNDED IN ACCORDANCE WITH NATIONAL  
AND LOCAL CODES.  
KEY  
A4  
B1  
COMPONENT  
CONTROL - TIMED OFF  
COMPRESSOR  
B4  
MOTOR - OUTDOOR FAN  
CAPACITOR - DUAL  
HEATER - COMPRESSOR  
CONTACTOR - COMPRESSOR  
SWITCH - HIGH PRESSURE  
SWITCH - LOSS OF CHARGE  
LINE VOLTAGE FACTORY INSTALLED  
LINE VOLTAGE FIELD INSTALLED  
24 VOLT FACTORY INSTALLED  
C12  
HR1  
K1-1  
S4  
CLASS II VOLTAGE FIELD INSTALLED  
S24  
Single Phase Wiring Diagram P/N 48352-001  
Figure 12  
Page 16  
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B4  
OUTDOOR  
FAN  
C1  
OUTDOOR FAN  
CAPACITOR  
A4  
TIMED OFF  
CONTROL  
(IF USED)  
PURPLE  
BLACK  
TO 24 VAC  
POWER SOURCE  
10 VA MINIMUM  
NEC CLASS 2  
ORANGE  
BLACK  
2
3
1
C
Y1  
BLACK  
COMPRESSOR  
B1  
BLACK  
T2  
T3  
L3  
T1  
COMPRESSOR  
CONTACTOR  
K1  
CRANKCASE HEATER  
(IF USED)  
L2 L1  
1
L1  
HR1  
L2  
L3  
GROUND  
208-230/60/3  
LUG  
GROUND  
208-230/60/3  
L1  
S40  
K1-1  
BLACK  
2
B1  
1
BLACK  
BLACK  
L2  
L3  
S4 HIGH  
PRESSURE  
SWITCH  
S24 LOSS  
OF CHARGE  
SWITCH  
(IF USED)  
(IF USED)  
ORANGE  
A4  
S24  
EQUIPMENT  
GROUND  
S4  
2
3
1
HR1  
C1  
K1  
PURPLE  
S40  
B4  
C
Y1  
TO 24 VAC  
POWER SOURCE  
10 VA MINIMUM  
NEC CLASS 2  
FOR USE WITH COPPER CONDUCTORS ONLY. REFER TO UNIT RATING  
PLATE FOR MINIMUM CIRCUIT AMPACITY AND MAXIMUM OVERCURRENT  
PROTECTION SIZE.  
1
2
DESCRIPTION  
COMPONENT  
JUMPER IS USED WHEN TOC IS NOT USED.  
KEY  
A4  
B1  
B4  
CONTROL - TIMED OFF  
COMPRESSOR  
WARNING--  
ELECTRIC SHOCK HAZARD, CAN CAUSE INJURY  
OR DEATH. UNIT MUST BE GROUNDED IN  
ACCORDANCE WITH NATIONAL AND LOCAL CODES.  
MOTOR - OUTDOOR FAN  
CAPACITOR - OUTDOOR FAN  
HEATER - COMPRESSOR  
CONTACTOR - COMPRESSOR  
SWITCH - HIGH PRESSURE  
SWITCH - LOSS OF CHARGE  
THERMOSTAT - CRANKCASE  
C1  
HR1  
K1-1  
S4  
S24  
S40  
LINE VOLTAGE FACTORY INSTALLED  
LINE VOLTAGE FIELD INSTALLED  
24 VOLT FACTORY INSTALLED  
CLASS II VOLTAGE FIELD INSTALLED  
Three Phase Wiring Diagram P/N 48436-001  
Figure 13  
# 48283B006  
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Limited Warranty  
August 1, 1997  
This warranty gives you specific legal rights and you may have other rights  
which vary from state/province to state/province.  
Warrantor: Armstrong Air Conditioning Inc., 421 Monroe St., Bellevue, OH 44811  
Armstrong Air Conditioning Inc. products are available under the following names: Air Ease, Armstrong Air, American Aire, Concord  
Subject to the limitations stated in this warranty, we warrant to the first buyer for use the residential heating, cooling or heat pump unit, when  
installed, operated and maintained as required by this warranty, to be free of defects in workmanship or material for a period of 5 years  
(1 year for commercial equipment) from the time of installation. We will replace any defective component without cost or expense to you  
except for the costs of delivery and labor for removal and replacement of the defective component.  
The 2SCU13LB Series air conditioners carry a 5-year compressor warranty. The 2SCU13LE Series air conditioners carry a 10-year  
compressor warranty.  
Warranty Begins  
The warranty period begins when the installation is complete and the product is ready to operate. You must be able to verify this date  
whenever a warranty claim is made. Original bill of sale, installer’s invoice or other similar document will suffice. If the beginning date  
cannot be verified, we will consider warranty coverage to begin 6 months after the date the product was shipped from our factory.  
Limitations on Implied Warranties  
Implied warranties of merchantability or, to the extent applicable, fitness for a particular purpose are limited to 5 years, the same duration  
as the basic limited written warranty provided herein. Some states/provinces do not allow limitations on how long an implied warranty of  
merchantability or fitness lasts, so the above limitations or exclusions may not apply to you.  
Only Warranty  
This written Limited Warranty is the only warranty made by the warrantor; this warranty is in lieu of and excludes all other warranties,  
express or implied. The warrantor does not authorize any person to provide any other warranty or to assume for it any further obligation in  
connection with the warranted product.  
What is NOT Covered  
1. Cabinets or cabinet pieces.  
2. Normal maintenance items such as filters, fan belts, fuses or other consumable items.  
3. Damage caused by misuse, failure to maintain properly, accidents or acts of God.  
4. External wiring, piping, venting or attachment of accessory products not integral to our product, including without limitation,  
humidifier, air cleaner, vent damper, thermostat or other mechanical devices not manufactured by the warrantor.  
5. Products that have been operated in a corrosive atmosphere where a concentration of acids, halogenated hydrocarbons or  
other corrosive elements causes deterioration to metal surfaces or integral components. NOTE: Operation in a corrosive  
atmosphere is considered abuse and voids this warranty.  
6. Products that have NOT been installed in accordance with our published installation instructions, applicable local, state/  
provincial or national codes, ACCA published standards.  
7. Products that have NOT been installed by competent, qualified installers.  
8. Products that have been moved from their original place of installation.  
Warranty on Replacement Components  
Any replacement component furnished by us will assume the remaining (unused) portion of the Limited Warranty.  
Consequential Damages  
The warrantor shall not be responsible for any consequential damages caused by any defect in the product. Some state/provinces do not  
allow the exclusion or limitations of incidental or consequential damages, so the above limitation or exclusion may not apply to you.  
This product must be installed, used and cared for in accordance with the instruction manual. You are responsible for required periodic  
maintenance or service, such as changing or cleaning of air filters and lubrication or cleaning of components. Failure to properly install,  
operate or maintain your unit voids this warranty.  
Page 18  
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