Carrier Air Conditioner 38TXA User Manual

38TXA 13.0 SEER  
Air Conditioner With R-410A  
Installation and Start-Up Instructions  
NOTE: Read the entire instruction manual before starting the  
installation.  
SAFETY CONSIDERATIONS  
Improper installation, adjustment, alteration, service, maintenance,  
or use can cause explosion, fire, electrical shock, or other  
conditions which may cause personal injury or property damage.  
Consult a qualified installer, service agency, or your distributor or  
branch for information or assistance. The qualified installer or  
agency must use factory-authorized kits or accessories when  
modifying this product. Refer to the individual instructions pack-  
aged with the kits or accessories when installing.  
Follow all safety codes. Wear safety glasses and work gloves. Use  
quenching cloth for brazing operations. Have fire extinguisher  
available. Read these instructions thoroughly and follow all  
warnings or cautions attached to the unit. Consult local building  
codes and the National Electrical Code (NEC) for special instal-  
lation requirements.  
Recognize safety information. This is the safety-alert symbol  
.
When you see this symbol on the unit or in instructions and  
manuals, be alert to the potential for personal injury.  
Understand the signal word DANGER, WARNING, or CAU-  
TION. These words are used with the safety-alert symbol. DAN-  
GER identifies the most serious hazards which will result in severe  
personal injury or death. WARNING signifies hazards which  
could result in personal injury or death. CAUTION is used to  
identify unsafe practices which would result in minor personal  
injury or product and property damage.  
A92446  
Fig. 1—38TXA  
INSPECT EQUIPMENT — File claim with shipping company  
prior to installation if shipment is damaged or incomplete. Locate  
unit rating plate on unit corner panel. (See Fig. 4.) It contains  
information needed to properly install unit. Check rating plate to  
be sure unit matches job specifications.  
R-410A systems operate at higher pressures than standard  
R-22 systems. Do not use R-22 service equipment or com-  
ponents on R-410A equipment.  
Step 2—Install on a Solid, Level Mounting Pad  
If conditions or local codes require unit be attached to pad, tiedown  
bolts should be used and fastened through knockouts provided in  
unit base pan. Refer to unit mounting pattern in Fig. 4. to  
determine base pan size and knockout hole location.  
Before installing or servicing system, always turn off main  
power to system. There may be more than 1 disconnect  
switch. Turn off accessory heater power if applicable. Elec-  
trical shock can cause personal injury or death.  
When installing, allow sufficient space for airflow, wiring, refrig-  
erant piping, and service. Allow 30-in. clearance to service end of  
unit and 48 in. above unit. For proper airflow, a 6-in. clearance on  
1 side of unit and 12 in. on all remaining sides must be maintained.  
Maintain a distance of 24 in. between air conditioners. Position so  
snow, ice, and water from roof or eaves cannot fall directly on unit.  
INSTALLATION  
Specifications for this unit in residential new construction market  
require outdoor unit, indoor unit, refrigerant tubing sets, metering  
device, and filter drier listed in presale literature. There can be no  
deviation. Consult Application Guideline and Service Manual to  
obtain required unit changes for specific applications, and for R-22  
retrofit.  
On rooftop applications, locate unit at least 6 in. above roof  
surface. Where possible, place unit above a load-bearing wall.  
Arrange supporting members to adequately support unit and  
minimize transmission of vibration to building. Consult local  
codes governing rooftop applications.  
Step 3—Install TXV (Optional)  
Step 1—Check Equipment and Jobsite  
UNPACK UNIT — Move to final location. Remove carton taking  
care not to damage unit.  
The accessory thermostatic expansion valve is specifically de-  
signed to operate with R-410A. Do not use an R-22 TXV. An  
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.  
Book  
Tab 3a 2a  
1
4
PC 101  
Catalog No. 563-813  
Printed in U.S.A.  
Form 38TXA-1SI  
Pg 1  
1-96  
Replaces: New  
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AIR IN  
AIR DISCHARGE  
3
/8" DIA TIEDOWN KNOCKOUTS  
(2) PLACES IN BASEPAN  
NOTES:  
1. Allow 30 in. (762 mm) clearance to service end of  
unit, 48 in. (1219 mm) above unit, 6 in. (152 mm) on one side, 12 in. (305 mm)  
on remaining side, and 24 in. (610 mm) between  
units for proper airflow.  
AIR IN  
2. Minimum outdoor operating ambient in cooling mode is  
55° F (12.8° C) (unless low ambient control is used) max 125° F (51.7° C).  
5. Series designation is the 13th position of the unit model number.  
6. Center of gravity  
D
C
L
E
SERIAL  
PROD  
MODEL  
PISTON  
ID  
OD  
C
FACTORY CHARGED R-22  
LBS  
Kg  
VOLTS  
HZ  
AIR DISCHARGE  
AIR IN  
POWER SUPPLY  
PH  
PERMISSIBLE VOLTAGE AT UNIT  
MAX  
UNIT RATING  
PLATE  
MIN  
VAPOR LINE CONN  
SUITABLE FOR OUTDOOR USE  
COMPRESSOR  
FIELD POWER SUPPLY CONN  
7
VOLTS AC  
A
/
IN. DIA HOLE WITH  
8
1
PH  
HZ  
AIR DISCHARGE  
1
/
IN. DIA KNOCKOUT  
AND  
8
RLA  
LRA  
B
3
FAN MOTOR  
1
/
IN. DIA KNOCKOUT  
8
VOLTS AC  
PH  
HZ  
FLA  
FIELD CONTROL  
DESIGN/TEST PRESSURE GAGE  
HI PSI  
LO PSI  
kPa  
kPa  
SUPPLY CONN  
7
MINIMUM CIRCUIT AMPS  
MAX OVERCURRENT PROTECTIVE DEVICE  
/
IN. DIA HOLE  
8
ACCESS  
PANEL  
TYPE  
USA  
CANADA  
MAX FUSE  
MAX HACR CKT-BKR  
MAX CKT-BKR  
N/A  
N/A  
3
®
/
IN. DIA LIQUID  
8
®
LINE CONN  
CARRIER CORP  
INDIANAPOLIS IN  
46206  
313948-401  
REV  
A
A92471  
A
B
C
In.  
D
In.  
4
E
UNIT  
SIZE  
In.  
In.  
30  
In.  
024-060  
34-15/16  
8-3/16  
9-3/4  
Fig. 4—Unit Reference Drawing  
In some cases noise in the living area has been traced to gas  
pulsations from improper installation of equipment.  
Installation of filter drier in liquid line is required.  
Step 6—Install Liquid-Line Filter drier (See Fig. 5)  
OUTDOOR UNITS CONNECTED TO FACTORY-APPROVED  
INDOOR UNITS — Outdoor unit contains correct system refrig-  
erant charge for operation with tested indoor unit listed in presale  
literature when connected by 15 ft of field-supplied or factory  
accessory tubing. Check refrigerant charge for maximum effi-  
ciency.  
1. Braze 5-in. connector tube to liquid service valve. Wrap filter  
drier with damp cloth.  
2. Braze filter drier between connector tube and liquid tube to  
indoor coil. Flow arrow must point towards indoor coil.  
Table 1—Refrigerant Connections and Recom-  
mended Liquid and Vapor Tube Diameters (In.)  
LIQUID-LINE  
FILTER-DRIER  
LIQUID  
LIQUID  
Connect  
VAPOR  
Connect  
UNIT  
SIZE  
SERVICE  
Tube  
Tube  
A
VALVE  
Diameter  
Diameter  
Diameter  
Diameter  
024  
3/8  
3/8  
3/8  
3/8  
3/8  
5/8  
5/8  
3/4  
030, 036  
042, 048  
060  
3/8  
3/4  
3/8  
7/8  
7/8  
CONNECTOR  
TUBE  
3/8  
7/8  
1-1/8  
Note: 1. Tube diameters are for lengths up to 50 ft. For tubing lengths greater  
than 50 ft, consult Application Guideline and Service Manual for air condition-  
ers with R-410A.  
A95509  
Fig. 5—Liquid-Line Filter drier  
3
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Step 7—Refrigerant Tubing  
Connect vapor tube to fitting on outdoor unit vapor service valve  
and connect liquid tube to filter drier. (See Fig. 5.)  
The cabinet must have an uninterrupted or unbroken ground  
according to NEC, ANSI/NFPA 70-1996, or local codes to  
minimize personal injury if an electrical fault should occur.  
This may consist of electrical wire or conduit approved for  
electrical ground when installed in accordance with existing  
electrical codes. Failure to follow this warning could result in  
an electrical shock, fire, or death.  
A brazing shield MUST be used when tubing sets are being  
brazed to the service valves to prevent damage to the painted  
unit surface.  
Relieve pressure and recover all refrigerant before system  
repair or final unit disposal to avoid personal injury or death.  
Use all service ports and open all flow control devices,  
including solenoid valves.  
To avoid personal injury or death, do not supply power to unit  
with compressor terminal box cover removed.  
CONNECT GROUND AND POWER WIRES — Connect ground  
wire to ground connection in control box for safety. Connect  
power wiring to contactor as shown in Fig. 6.  
To avoid valve damage while brazing, service valves must be  
wrapped with a heat-sinking material such as a wet cloth.  
DISCONNECT  
PER N.E.C. AND/OR  
LOCAL CODES  
SWEAT CONNECTION — Use refrigerant grade tubing. Service  
valves are closed from factory and ready for brazing. After  
wrapping service valve and filter drier with wet cloth, tubing set  
can be brazed to service valve and filter drier using either silver  
bearing or non-silver bearing brazing material. Consult local code  
requirements. Refrigerant tubing and indoor coil are now ready for  
leak testing. This check should include all field and factory joints.  
CONTACTOR  
FIELD POWER  
WIRING  
BLUE  
3 PHASE ONLY  
Step 8—Evacuate  
FIELD GROUND  
WIRING  
Refrigerant tubes and indoor coil should be evacuated using the  
recommended deep vacuum method of 500 microns. The alternate  
triple evacuation method may be used if the procedure outlined in  
the Service Manual is followed. Always break a vacuum with dry  
nitrogen.  
GROUND  
LUG  
A94025  
Fig. 6—Line Power Connections  
CONNECT CONTROL WIRING — Route 24-v control wires  
through control wiring grommet and connect to brown and blue  
pigtails supplied in unit splice box. (See Fig. 7.)  
Never use the system compressor as a vacuum pump.  
Step 9—Make Electrical Connections  
Use No. 18 AWG color-coded, insulated (35° C minimum) wire.  
If thermostat is located more than 100 ft from unit (as measured  
along the control voltage wires), use No. 16 AWG color-coded  
wire to avoid excessive voltage drop.  
Be sure field wiring complies with local and national fire, safety,  
and electrical codes, and voltage to system is within limits shown  
on unit rating plate. Contact local power company for correction of  
improper voltage. See unit rating plate for recommended circuit  
protection device. (See Fig. 4.)  
Use furnace transformer, fan coil transformer, or accessory trans-  
former for control power, 24v/40va minimum.  
NOTE: Operation of unit on improper line voltage constitutes  
NOTE: Use of available 24-v accessories may exceed the mini-  
mum 40-va power requirement. Determine total transformer load-  
ing and increase transformer capacity or split load with an  
accessory transformer as required.  
abuse and could affect unit reliability. See unit rating plate.  
NOTE: Use only copper wire between disconnect switch and  
unit.  
NOTE: Install branch circuit disconnect per NEC of adequate  
size to handle unit starting current, but not larger than maximum  
fuse size shown on unit rating plate. Locate disconnect within sight  
from and readily accessible from unit, per Section 440-14 of NEC.  
Step 10—Install Electrical Accessories  
Refer to individual instructions packaged with kits or accessories  
when installing.  
Step 11—Start-Up  
ROUTE GROUND AND POWER WIRES — Remove access  
panel and control box cover to gain access to unit wiring. Extend  
wires from disconnect through power wiring hole provided and  
into unit control box. (See Fig. 4.) Size wires per NEC but not  
smaller than minimum wire size shown in presale literature.  
1. After system is evacuated, fully back seat (open) liquid and  
vapor service valves. Unit is shipped with valve stem(s) front  
seated and caps installed.  
2. Replace stem caps after system is opened to refrigerant flow  
(back seated). Replace caps finger tight and tighten additional  
1/12 turn with wrench.  
3. Close electrical disconnects to energize system.  
4. Be sure thermostat set point is below indoor ambient tempera-  
ture. Set room thermostat at COOL and fan at ON or AUTO,  
as desired. Operate unit for 15 minutes. Check system  
refrigerant charge.  
4
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5. Factory charge and superheat charging method are shown on  
unit information plate. (See Fig. 4.) R-410A refrigerant  
cylinders contain a dip tube which allows liquid refriger-  
ant to flow from cylinder in upright position. Charge  
R-410A units with cylinder in upright position and a  
commercial-type metering device in manifold hose. Charge  
refrigerant into suction-line.  
Do not vent refrigerant to atmosphere. Recover for system  
repair or final unit disposal.  
CARE AND MAINTENANCE  
For continuing high performance and to minimize possible equip-  
ment failure, it is essential that periodic maintenance be performed  
on this equipment. Consult servicing contractor or User’s Manual  
for the proper frequency of maintenance. Frequency of mainte-  
nance may vary depending upon geographic areas, such as coastal  
applications.  
Do not disable low-pressure switch during a condenser pump  
down. Compressor damage may occur if run at a negative  
suction pressure.  
Step 1—Leave User’s Manual With Homeowner  
Explain system operation and maintenance procedures outlined in  
User’s Manual.  
Compressor damage may occur if system is overcharged.  
Service valve gage ports are not equipped with Schrader  
valves. To prevent personal injury, make sure valves are fully  
back seated before removing gage port caps. Wear safety  
glasses and gloves when handling refrigerant.  
ATTENTION INSTALLERS AND SERVICE TECHNICIANS!  
AIR CONDITIONER WITH R-410A—QUICK REFERENCE GUIDE  
R-410A refrigerant operates at 50%-70% higher pressures than R-22. Be sure that servicing equipment  
and replacement components are designed to operate with R-410A.  
R-410A refrigerant cylinders are rose colored.  
R-410A refrigerant cylinders have a dip tube which allows liquid to flow out of cylinder in upright  
position.  
R-410A systems should be charged with liquid refrigerant. Use a commercial type metering device in the  
manifold hose.  
R-410A, as with other HFCs, is only compatible with POE oils.  
Vacuum pumps will not remove moisture from oil.  
Do not use liquid-line filter driers with rated working pressures less than 600 psig.  
Do not install a suction-line filter drier in liquid line.  
POE oils absorb moisture rapidly. Do not expose oil to atmosphere.  
Wrap all filter driers and service valves with wet cloth when brazing.  
A liquid-line filter drier is required on every unit.  
Do not use an R-22 TXV.  
If indoor unit is equipped with a TXV, it must be changed to an R-410A TXV.  
Never open system to atmosphere while it is under a vacuum.  
When system must be opened for service, break vacuum with dry nitrogen and replace filter driers.  
Do not vent R-410A into the atmosphere.  
Observe all warnings, cautions, and bold text.  
Do not use capillary tube indoor coils.  
5
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CORPORATE  
NON-PROGRAMMABLE  
THERMOSTAT  
CORPORATE  
NON-PROGRAMMABLE  
THERMOSTAT  
FA, FB, FC,  
FD, FF  
FAN COIL  
AIR  
CONDITIONER  
MODEL AC  
SINGLE  
STAGE  
AIR  
R
R
24 VAC HOT  
MODEL AC  
CONDITIONER  
FURNACE  
R
C
R
24 VAC HOT  
24 VAC COM  
C
W/W1  
Y/Y2  
G
24 VAC COM  
C
SEE  
C
C
NOTE 2  
HEAT STAGE 1  
COOL STAGE 1  
INDOOR FAN  
W2  
SEE  
W/W1  
C
NOTE 2  
HEAT STAGE 1 W/W1  
Y/Y2  
G
Y/Y2  
G
COOL STAGE 1  
INDOOR FAN  
G
A94385  
A94384  
CORPORATE  
PROGRAMMABLE  
THERMOSTAT  
MODEL AC  
CORPORATE  
PROGRAMMABLE  
THERMOSTAT  
MODEL AC  
FA, FB, FC,  
FD, FF  
AIR  
SINGLE  
CONDITIONER  
FAN COIL  
AIR  
STAGE  
CONDITIONER  
FURNACE  
R
R
G
24 VAC HOT  
INDOOR FAN  
HEAT STAGE 1  
COOL STAGE 1  
NOT USED  
R
R
G
24 VAC HOT  
INDOOR FAN  
HEAT STAGE 1  
COOL STAGE 1  
NOT USED  
G
W/W1  
Y/Y2  
G
W2  
W/W1  
Y/Y2  
W/W1  
Y/Y2  
SEE  
NOTE 2  
O/W2  
O/W2  
C
SEE  
NOTE 2  
Y1/W2  
NOT USED  
C
Y1/W2  
NOT USED  
24 VAC COM  
NOT USED  
NOT USED  
C
B
L
C
24 VAC COM  
NOT USED  
NOT USED  
C
C
B
L
OPTIONAL  
OUTDOOR  
SENSOR  
S1  
S2  
OPTIONAL  
OUTDOOR  
SENSOR  
S1  
S2  
CONNECTION  
CONNECTION  
A94386  
A94387  
Fig. 7—Typical 24-v Circuit Connections  
6
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CORPORATE  
PROGRAMMABLE  
THERMOSTAT  
MODEL AC  
FK4C  
AIR  
FAN COIL CONDITIONER  
R
G
R
24 VAC HOT  
INDOOR FAN  
G
W1  
Y/Y2  
O
CORPORATE  
NON-PROGRAMMABLE  
THERMOSTAT  
FK4C  
AIR  
HEAT STAGE 1 W/W1  
COOL STAGE 1 Y/Y2  
MODEL AC  
FAN COIL CONDITIONER  
R
C
R
24 VAC HOT  
24 VAC COM  
NOT USED  
NOT USED  
O/W2  
C
SEE  
NOTE  
2
Y1/W2  
HEAT STAGE 1 W/W1  
COOL STAGE 1 Y/Y2  
Y1  
W2  
C
W1  
SEE  
NOTE  
2
C
C
Y/Y2  
G
24 VAC COM  
NOT USED  
NOT USED  
C
B
L
INDOOR FAN  
G
DH  
W2  
O
COOL STAGE 1 S1  
INDOOR FAN  
S2  
Y1  
DH  
A95502  
A95503  
NON-CORPORATE  
NON-PROGRAMMABLE  
THERMOSTAT  
NON-CORPORATE  
NON-PROGRAMMABLE  
THERMOSTAT  
FA, FB, FC,  
FD, FF  
FAN COIL  
AIR  
CONDITIONER  
MODEL AC  
SINGLE  
AIR  
STAGE  
MODEL AC  
CONDITIONER  
FURNACE  
R
R
24 VAC HOT  
R
R
24 VAC HOT  
C
C
SEE  
NOTE 2  
C
W
Y
HEAT STAGE 1  
COOL STAGE 1  
INDOOR FAN  
W2  
SEE  
W/W1  
C
NOTE 2  
HEAT STAGE 1  
COOL STAGE 1  
INDOOR FAN  
W
Y
Y/Y2  
G
G
G
G
A95282  
A95283  
Fig. 7—Typical 24-v Circuit Connections (Continued)  
7
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NON-CORPORATE  
NON-PROGRAMMABLE  
THERMOSTAT  
FK4C  
AIR  
MODEL AC  
FAN COIL CONDITIONER  
R
R
24 VAC HOT  
C
HEAT STAGE 1  
COOL STAGE 1  
INDOOR FAN  
W
Y
W1  
SEE  
NOTE  
2
C
Y/Y2  
G
G
W2  
O
Y1  
DH  
A95501  
Fig. 7—Typical 24-v Circuit Connections (Continued)  
NOTES:  
1. Corporate thermostat wiring diagrams are only accurate for model numbers beginning with TSTAT_______.  
2. Some units are equipped with pressure switches, temperature switch, or 5 minute compressor cycle protection. Connect 24-v field wiring  
to factory-provided stripped leads.  
3. Wiring must conform to NEC or local codes.  
4. To stage the electric resistance heat, consult outdoor thermostat Installation Instructions.  
LEGEND  
24 VOLT FACTORY WIRING  
24 VOLT FIELD WIRING  
FIELD SPLICE CONNECTION  
C
CONTACTOR  
A95500  
Fig. 8—Typical 24-v Circuit Connections Legend  
Copyright 1996 CARRIER Corp. • 7310 W. Morris St. • Indianapolis, IN 46231  
38txa1si  
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.  
Book  
Tab 3a 2a  
1
4
PC 101  
Catalog No. 563-813  
Printed in U.S.A.  
Form 38TXA-1SI  
Pg 8  
1-96  
Replaces: New  
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