Carrier Heat Pump 38YRA User Manual

38YRA  
Heat Pump—Outdoor Section  
Installation and Start-Up Instructions  
NOTE: Read the entire instruction manual before starting the  
installation.  
This symbol indicates a change since last issue.  
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.  
.
A92446  
Fig. 1—Model 38YRA  
clearance on 1 side of unit and 12 in. on all remaining sides must  
be maintained. Maintain a distance of 24 in. between units.  
Position so snow, ice, and water from roof or eaves cannot fall  
directly on unit.  
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.  
On rooftop applications, locate unit at least 6 in. above roof  
surface. Place unit above a load-bearing wall and isolate unit and  
tubing set from structure.  
Arrange supporting members to adequately support unit and  
minimize transmission of vibration to building. Consult local  
codes governing rooftop applications.  
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.  
Step 3—Elevate Unit  
For proper drainage the heat pump must be raised off the mounting  
surface. Fig. 4 shows unit with accessory support feet installed.  
Use accessory heat pump snow rack in areas where prolonged  
subfreezing temperatures or heavy snow occur. Refer to separate  
Installation Instructions packaged with the accessories.  
INSTALLATION  
Step 1—Check Equipment and Jobsite  
UNPACK UNIT — Move to final location. Remove carton taking  
care not to damage unit.  
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. 2.) It contains  
information needed to properly install unit. Check rating plate to  
be sure unit matches job specifications.  
For proper unit operation and reliability, this unit must be  
installed with the field-supplied balance port, hard shut-off  
TXV. Do not install with evaporator coils having capillary  
tube metering devices.  
Step 2—Install on a Solid, Level Mounting Pad  
Step 4—Remove Indoor AccuRater® Piston and Install  
TXV  
If conditions or local codes require the unit be attached to pad,  
tie-down bolts should be used and fastened through knockouts  
provided in unit base pan. Refer to unit mounting pattern in Fig. 2  
to determine base pan size and knockout hole location.  
After removing existing AccuRater from indoor coil, install  
field-supplied bi-flow hard shut-off TXV kit. (See Fig. 5 and 6.)  
For TXV kit part number and charging instruction, refer to TXV  
label in your unit. If the indoor unit (fan coil) comes factory-  
equipped with a bi-flow hard shut-off TXV, no TXV change is  
required.  
When installing, allow sufficient space for airflow clearance,  
wiring, refrigerant piping, and service. Allow 30-in. clearance to  
service end of unit and 48 in. above unit. For proper airflow, a 6-in.  
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.  
Book  
Tab 5a 5a  
1
4
PC 101  
Catalog No. 533-890  
Printed in U.S.A.  
Form 38YRA-2SI  
Pg 1  
8-95  
Replaces: 38YRA-1SI  
 
7. Do not suspend refrigerant tubing from joists and studs with a  
rigid wire or strap which comes in direct contact with the  
tubing. (See Fig. 3.)  
NOTE: Avoid contact between tubing and structure  
OUTDOOR WALL  
CAULK  
INDOOR WALL  
LIQUID TUBE  
VAPOR TUBE  
JOIST  
INSULATION  
THROUGH THE WALL  
A93567  
Fig. 4—Accessory Support Feet  
HANGER STRAP  
(AROUND VAPOR  
TUBE ONLY)  
INSULATION  
VAPOR TUBE  
COIL  
SENSING  
BULB  
EQUALIZER  
TUBE  
1MIN.  
LIQUID TUBE  
SUSPENSION  
THERMOSTATIC  
EXPANSION  
VALVE  
A94028  
Fig. 3—Piping Installation  
8. Ensure that tubing insulation is pliable and completely sur-  
rounds the vapor tube.  
A88382  
Fig. 5—Typical TXV Installation  
9. When necessary, use hanger straps which are 1 in. wide and  
conform to the shape of the tubing insulation. (See Fig. 3.)  
10 O'CLOCK  
2 O'CLOCK  
10. Isolate the hanger straps from the insulation by using metal  
sleeves bent to conform to the shape of the insulation.  
SENSING BULB  
If refrigerant tubes or indoor coil is exposed to atmospheric  
conditions for longer than 5 minutes, it must be evacuated to 500  
microns to eliminate contamination and moisture in the system.  
STRAP  
OUTDOOR UNITS CONNECTED TO FACTORY-APPROVED  
INDOOR UNITS — Outdoor unit contains correct system refrig-  
erant charge for operation with indoor unit of the same size when  
connected by 15 ft of field-supplied or factory accessory tubing.  
Check refrigerant charge for maximum efficiency. (See Step  
10—Checking Charge.)  
SUCTION TUBE  
8 O'CLOCK  
78 IN. OD & SMALLER  
4 O'CLOCK  
LARGER THAN 78 IN. OD  
REFRIGERANT TUBING — Connect refrigerant tubing to fit-  
tings on outdoor unit vapor and liquid service valves. (See Fig. 2.)  
A81032  
Fig. 6—Positioning of Sensing Bulb  
Table 1—Refrigerant Connections and Recom-  
mended Liquid and Vapor Tube Diameters (In.)  
To avoid valve damage while brazing, service valves must be  
wrapped with a heat sinking material such as a wet cloth.  
LIQUID  
Connect  
VAPOR  
Connect  
UNIT  
SIZE  
SWEAT CONNECTION — Use refrigerant grade tubing. Service  
valves are closed from factory and ready for brazing. After  
wrapping the service valve with a wet cloth, the tubing set can be  
brazed to the service valve using either silver bearing or non-silver  
bearing brazing material. Remove plastic retainer holding outdoor  
piston in the liquid service valve and connect sweat adapter  
provided to valve. (See Fig. 7.) Consult local code requirements.  
Refrigerant tubing and indoor coil are now ready for leak testing.  
This check should include all field and factory joints.  
Tube  
Tube  
Diameter  
Diameter  
Diameter  
Diameter  
018  
024-030  
036-048  
060  
3/8  
3/8  
3/8  
3/8  
3/8  
5/8  
5/8  
3/4  
3/8  
3/4  
3/8  
7/8  
7/8  
3/8  
7/8  
1-1/8  
Note: Tube diameters are for lengths up to 50 ft. For tubing lengths greater  
than 50 ft, consult Long-Line Application Guideline.  
3
 
NOTE: Install branch circuit disconnect per NEC of adequate  
size to handle unit starting current. Locate disconnect within sight  
from and readily accessible from unit, per Section 440-14 of NEC.  
INSIDE STRAINER  
FLARE NUT  
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. 2.)  
FLARE ADAPTER  
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. 8.  
PISTON RETAINER  
PISTON  
CONNECT CONTROL WIRING — Route 24-v control wires  
through control wiring grommet and connect leads to control  
wiring terminal board. (See Fig. 9.)  
Use No. 18 AWG color-coded, insulated (35° C minimum) wires.  
If thermostat is located more than 100 ft from unit (as measured  
along the control voltage wires), use No. 16 AWG color-coded  
wires to avoid excessive voltage drop.  
LIQUID SERVICE VALVE  
A92464  
Use furnace transformer, fan coil transformer, or accessory trans-  
former for control power, 24-v/40va minimum.  
Fig. 7—Service Valve with Sweat Adapter Tube  
NOTE: Use of available 24-v accessories may exceed the mini-  
mum 40-va power requirement. Determine total transformer load-  
ing and increase the transformer capacity or split the load with an  
accessory transformer as required.  
A brazing shield MUST be used when tubing sets are being  
brazed to the service valves to prevent damage to the painted  
unit surface.  
NOTE: The defrost timer is factory set for 90-minute cycles. The  
timer can be field set for 30- and 50-minute cycles depending on  
defrost conditions in your geographical location.  
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.  
DISCONNECT  
PER N.E.C. AND/OR  
LOCAL CODES  
CONTACTOR  
Do not vent refrigerant to atmosphere. Recover during system  
repair or final unit disposal.  
FIELD POWER  
WIRING  
BLUE  
3 PHASE ONLY  
Step 7—Make Electrical Connections  
FIELD GROUND  
WIRING  
GROUND  
LUG  
To avoid personal injury or death, do not supply power to unit  
with compressor terminal box cover removed.  
A94025  
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.  
Fig. 8—Line Power Connections  
Step 8—Install Electrical Accessories  
Refer to the individual instructions packaged with the kits or  
accessories when installing.  
According to NEC, ANSI/NFPA 70, and local codes, the  
cabinet must have an uninterrupted or unbroken ground to  
minimize personal injury if an electrical 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.  
Damage may occur to the scroll compressor if operated at a  
negative suction pressure during a system pumpdown.  
Step 9—Start-Up  
1. Fully back seat (open) liquid and vapor tube service valves.  
2. Unit is shipped with valve stem(s) front seated and caps  
installed. Replace stem caps after system is opened to refrig-  
erant flow (back seated). Replace caps finger tight and tighten  
additional 1/12 turn using a backup wrench on valve body flats  
to prevent distortion of sheet metal.  
NOTE: Operation of unit on improper line voltage constitutes  
abuse and could affect unit reliability. See unit rating plate. Do not  
install unit in system where voltage or phase imbalance may  
fluctuate above or below permissible limits.  
3. Close electrical disconnects to energize system.  
4. Set room thermostat at desired temperature.  
NOTE: Use copper wire only between disconnect switch and  
unit.  
4
 
5. Set room thermostat at HEAT or COOL and fan switch at ON  
or AUTO, as desired. Operate unit for 15 minutes. Check  
system refrigerant charge. (See Step 10.)  
The defrost mode is identical to the cooling mode except the  
outdoor fan motor stops and a second-stage heat is turned on to  
continue warming the conditioned space.  
SEQUENCE OF OPERATION — With power supplied to indoor  
and outdoor units, transformer is energized.  
Step 10—Checking Charge  
Cooling  
On a call for cooling, the thermostat makes circuits R-O, R-Y, and  
R-G. Circuit R-O energizes the reversing valve, switching it to  
cooling position. Circuit R-Y energizes the contactor, starting  
outdoor fan motor and compressor circuit. R-G energizes the  
indoor unit blower relay, starting the indoor blower motor on high  
speed.  
Do not vent refrigerant to atmosphere. Recover during system  
repair or final unit disposal.  
Factory charge is shown on unit rating plate. (See Fig. 2.)  
When the thermostat is satisfied, its contacts open, de-energizing  
the contactor and blower relay. Compressor and motors should  
stop.  
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.  
Heating  
On a call for heating, the thermostat makes circuits R-Y and R-G.  
Circuit R-Y energizes contactor, starting outdoor fan motor and  
compressor. Circuit R-G energizes the indoor blower relay, start-  
ing the blower motor on high speed.  
Compressor damage may occur if system is overcharged.  
Should the temperature continue to fall, R-W2 is made through the  
second-stage room thermostat bulb. Circuit R-W2 energizes a  
sequencer, bringing on the first bank of supplemental electric heat  
and providing electrical potential to the second heater sequencer (if  
used). If the outdoor temperature falls below the setting of the  
outdoor thermostat (field-installed option), the contacts close to  
complete the circuit and bring on the second bank of supplemental  
electric heat.  
Adjust charge in cooling mode by following procedure shown on  
the subcooling charging tables located on unit information plate.  
Check charge in heating mode by following procedure shown on  
heating check chart located on unit information plate.  
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 your servicing contractor or User’s  
Manual for the proper frequency of maintenance. Frequency of  
maintenance may vary depending upon geographic areas, such as  
coastal applications.  
When the thermostat is satisfied, its contacts open, de-energizing  
the contactor and sequencer. All heaters and motors should stop.  
Defrost  
The defrost control is a time/temperature control which includes a  
field-selectable (quick connect pins located at edge of circuit  
board) time period between defrost cycles (30, 50, and 90  
minutes), factory set at 90 minutes.  
Step 1—Leave User’s Manual with Homeowner  
The electronic timer and the defrost cycle will start only when the  
contactor is energized and the defrost thermostat is closed.  
Explain system operation and maintenance procedures outlined in  
User’s Manual.  
5
 
TWO-STAGE OR  
VARIABLE SPEED  
FURNACE  
DUAL FUEL  
THERMOSTAT  
SINGLE-SPEED  
HEAT PUMP  
DUAL FUEL  
THERMOSTAT  
SINGLE-STAGE  
FURNACE  
SINGLE-SPEED  
HEAT PUMP  
24 VAC HOT  
FAN  
R
R
G
R
G
24 VAC HOT  
R
G
R
G
R
W2  
Y
W/W1  
Y/Y2  
W/W1  
FURNACE LO  
COMPRESSOR  
RVS COOLING  
FURNACE HI  
FAN  
Y/Y2  
O
W2  
Y
W/W1  
Y/Y2  
W
Y
FURNACE  
COMPRESSOR  
RVS COOLING  
O/W2  
O
W2  
Y1/W2  
O/W2  
O
Y1  
C
Y1/W2  
N/A  
24 VAC COM  
RVS HEATING  
RVS SENSING  
C
C
24 VAC COM  
C
C
C
B
L
RVS HEATING  
RVS SENSING  
B
L
SEE NOTES 1 AND 2  
SEE NOTE 1  
OUTDOOR  
S1  
S2  
OUTDOOR  
SENSOR  
OUTDOOR  
TEMPERATURE  
SENSOR  
S1  
S2  
OUTDOOR  
SENSOR  
TEMPERATURE  
SENSOR  
CONNECTION  
CONNECTION  
A95216  
A95215  
CORPORATE  
PROGRAMMABLE  
THERMOSTAT  
MODEL HP  
CORPORATE  
NON-PROGRAMMABLE  
THERMOSTAT  
FA, FB, FC,  
FD, FF  
HEAT  
PUMP  
FA, FB, FC,  
FD, FF  
FAN COIL  
FAN COIL  
HEAT  
PUMP  
MODEL HP  
24 VAC HOT  
R
R
R
G
24 VAC HOT  
R
R
R
C
INDOOR FAN  
G
24 VAC COM  
C
C
HEAT STAGE 2  
W/W1  
W2  
W2  
HEAT STAGE 2  
W/W1  
W2  
W2  
COOL/HEAT  
STAGE 1  
Y/Y2  
Y
COOL/HEAT  
STAGE 1  
Y/Y2  
G
Y
O/W2  
O
RVS COOLING  
NOT USED  
G
INDOOR FAN  
Y1/W2  
C
O/W2  
Y1  
O
RVS COOLING  
NOT USED  
NOT USED  
TROUBLE  
C
C
24 VAC COM  
NOT USED  
TROUBLE  
B
L
B
L
OPTIONAL  
OUTDOOR  
SENSOR  
S1  
S2  
OPTIONAL  
OUTDOOR  
SENSOR  
S1  
S2  
CONNECTION  
CONNECTION  
A94390  
A94391  
Fig. 9—Typical 24-v Circuit Connections  
6
 
CORPORATE  
NON-PROGRAMMABLE  
THERMOSTAT  
FK4B  
FAN COIL  
HEAT  
PUMP  
MODEL HP  
24 VAC HOT  
R
C
R
R
CORPORATE  
PROGRAMMABLE  
THERMOSTAT  
MODEL HP  
24 VAC COM  
C
C
FK4B  
FAN COIL  
HEAT  
PUMP  
HEAT STAGE 2  
W2  
W/W1  
W2  
24 VAC HOT  
R
G
R
R
COOL/HEAT  
STAGE 1  
Y/Y2  
G
Y/Y2  
Y
INDOOR FAN  
G
W2  
Y
HEAT STAGE 2  
W/W1  
W2  
G
W3  
O
INDOOR FAN  
COOL/HEAT  
STAGE 1  
Y/Y2  
Y/Y2  
O
O/W2  
RVS COOLING  
NOT USED  
NOT USED  
TROUBLE  
O/W2  
RVS COOLING  
NOT USED  
O
O
Y1  
B
Y1  
E
Y1/W2  
W3  
C
C
C
24 VAC COM  
NOT USED  
TROUBLE  
L
L
E
L
B
L
OPTIONAL  
OUTDOOR  
SENSOR  
S1  
S2  
OPTIONAL  
OUTDOOR  
SENSOR  
CONNECTION  
S1  
S2  
CONNECTION  
A94392  
A94393  
CORPORATE  
NON-PROGRAMMABLE  
THERMOSTAT  
FK4C  
CORPORATE  
PROGRAMMABLE  
THERMOSTAT  
MODEL HP  
HEAT  
PUMP  
MODEL HP  
FAN COIL  
FK4C  
FAN COIL  
HEAT  
PUMP  
24 VAC HOT  
R
R
R
24 VAC COM  
24 VAC HOT  
R
G
R
R
C
C
C
INDOOR FAN  
G
HEAT STAGE 2  
W2  
W/W1  
W1  
W2  
Y
HEAT STAGE 2  
W/W1  
Y/Y2  
W1  
COOL/HEAT  
STAGE 1  
Y/Y2  
Y/Y2  
Y
COOL/HEAT  
STAGE 1  
Y/Y2  
G
G
W2  
O
INDOOR FAN  
O/W2  
RVS COOLING  
NOT USED  
O
O
Y1/W2  
W2  
O
O/W2  
RVS COOLING  
C
C
C
NOT USED  
24 VAC COM  
NOT USED  
TROUBLE  
Y1  
Y1  
NOT USED  
B
L
B
L
TROUBLE  
OPTIONAL  
OUTDOOR  
SENSOR  
S1  
S2  
OPTIONAL  
OUTDOOR  
SENSOR  
S1  
S2  
CONNECTION  
CONNECTION  
A95330  
A95331  
Fig. 9—Typical 24-v Circuit Connections (continued)  
7
 
NON-CORPORATE  
NON-PROGRAMMABLE  
THERMOSTAT  
FK4B  
FAN COIL  
HEAT  
PUMP  
MODEL HP  
NON-CORPORATE  
NON-PROGRAMMABLE  
THERMOSTAT  
24 VAC HOT  
R
C
R
R
FA, FB, FC,  
FD, FF  
HEAT  
PUMP  
24 VAC COM  
FAN COIL  
C
MODEL HP  
C
24 VAC HOT  
R
R
R
C
HEAT STAGE 2  
W2  
W
W2  
C
W2  
Y
C
24 VAC COM  
COOL/HEAT  
STAGE 1  
Y
Y/Y2  
Y
HEAT STAGE 2  
W
Y
W2  
G
G
W3  
O
INDOOR FAN  
COOL/HEAT  
STAGE 1  
O
O
RVS COOLING  
G
O
G
INDOOR FAN  
Y1  
E
RVS COOLING  
O
EMERGENCY  
HEAT  
E
EMERGENCY  
HEAT  
E
L
A95279  
A95280  
Fig. 9—Typical 24-v Circuit Connections (continued)  
WIRING DIAGRAM NOTES:  
1. Underlined letter on dual terminal indicates its usage.  
Outdoor Temperature Sensor must be attached in all dual fuel installations.  
Jumper wire between O/W2 and L thermostst terminals MUST be present.  
2. Y1 and O connections to 2-stage furnaces MAY NOT EXIST, or may be only a wire rather than a screw terminal.  
3. Corporate thermostat model numbers begin with TSTAT_______.  
4. Wiring must conform to NEC or local code.  
5. To stage the electric resistance heat, consult outdoor thermostat installation instructions.  
Copyright 1995 CARRIER Corp. • 7310 W. Morris St. • Indianapolis, IN 46231  
38yra2si  
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.  
Book  
Tab 5a 5a  
1
4
PC 101  
Catalog No. 533-890  
Printed in U.S.A.  
Form 38YRA-2SI  
Pg 8  
8-95  
Replaces: 38YRA-1SI  
 

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