Carrier 38YRA User Manual
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 packaged 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 installation 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 CAUTION. These words are used with the safety-alert symbol. DANGER identifies the most serious hazards which willresultinsevere
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.
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. Electrical shock can cause personal injury or death.
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.
Step 2—Install on a Solid, Level Mounting Pad
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.
When installing, allow sufficient space for airflow clearance,
wiring, refrigerant piping, and service. Allow 30-in. clearance to
service end of unitand48 in. above unit. For proper airflow, a 6-in.
38YRA
Heat Pump—Outdoor Section
.
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.
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.
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.
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 4—Remove Indoor AccuRater® Piston and Install
TXV
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 factoryequipped with a bi-flow hard shut-off TXV, no TXV change is
required.
A92446
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1 4
Tab 5a 5a
PC 101 Catalog No. 533-890 Printed in U.S.A. Form 38YRA-2SI Pg 1 8-95 Replaces: 38YRA-1SI
AIR DISCHARGE
AIR IN
C
L
AIR DISCHARGE
VAPOR LINE CONN
AIR DISCHARGE
AIR IN
AIR IN
A
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.
2. Minimum outdoor operating ambient in cooling mode is
D
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.
E
6. Center of gravity
C
UNIT RATING
PLATE
FIELD POWER SUPPLY CONN
7
/8 IN. DIA HOLE WITH
1
/8 IN. DIA KNOCKOUT
1
AND
3
1
/8 IN. DIA KNOCKOUT
FIELD CONTROL
SUPPLY CONN
7
/8 IN. DIA HOLE
3
/8 IN. DIA LIQUID
LINE CONN
ACCESS
B
PANEL
SERIAL
PROD
MODEL
ID OD
PISTON
FACTORY CHARGED R-22
LBS
VOLTSPOWER SUPPLY
PH
PERMISSIBLE VOLTAGE AT UNIT
MAX
SUITABLE FOR OUTDOOR USE
COMPRESSOR
VOLTS AC
PH
HZ
RLA
LRA
FAN MOTOR
VOLTS AC
PH
HZ
FLA
DESIGN/TEST PRESSURE GAGE
kPa
PSI
HI
kPa
PSI
LO
MINIMUM CIRCUIT AMPS
MAX OVERCURRENT PROTECTIVE DEVICE
USA
®
N/A
®
INDIANAPOLIS IN
CANADA
N/A
46206313948-401 REV A
TYPE
MAX FUSE
MAX HACR CKT-BKR
MAX CKT-BKR
CARRIER CORP
Kg
HZ
MIN
UNIT
SIZE
ABCD E
In. In. In. In. In.
→ 018-048 34-15/16 30 8-3/16 4 9-3/4
060 45 38-5/8 8-9/16 5-15/16 11-13/16
Fig. 2—Unit Reference Drawing
Install TXV kit to indoor coil as follows:
1. Install suction tube adapter.
2. Install liquid flare-to-sweat adapter.
3. Install TXV on liquid flare-to-sweat adapter.
4. Connect external equalizer tube to fitting on suction tube
adapter.
5. Position sensing bulb on horizontal portion of suction tube
adapter. Secure using supplied hardware. Insulate bulb after
installation. (See Fig. 6.)
6. Leak check all connections.
DO NOT BURY MORE THAN 36 IN. OF REFRIGERANT
TUBING IN GROUND. If any section of tubing is buried,
there must be a 6-in. vertical rise to the valve connections on
the outdoor unit. If more than the recommended length is
buried, refrigerant may migrate to cooler buried section
during extended periods of unit shutdown, causing refrigerant
slugging and possible compressor damage at start-up.
Step 5—Install Liquid Solenoid Valve (LSV)— Optional
Heating efficiency (HSPF) can be improved with the addition of a
LSV. Refer to presale literature for rating with this enhancement.
Install per Installation Instructions included in accessory kit part
number KHALS0101LLS.
NOTE: To enhance heating HSPF, flow arrow must point toward
outdoor coil.
Step 6—Make Piping Connections
Outdoor units may be connected to indoor sections using accessory
tubing package or field-supplied refrigerant grade tubing of correct
size and condition. For tubing requirements beyond 50 ft, consult
Long-Line Application Guideline which is available at your local
distributor.
In some cases noise in the living area has been traced to gas
pulsations from improper installation of equipment.
INSTALLATION RECOMMENDATIONS
1. Locate the unit away from windows.
2. Ensure that vapor and liquid tube diameters are appropriate to
the capacity of the unit. (See Table 1.)
3. Run refrigerant tubes as directly as possible by avoiding
unnecessary turns and bends.
4. Leave some slack between the structure and the unit to absorb
vibration.
5. When passing refrigerant tubes through the wall, seal the
opening with RTV or other pliable silicon-based caulk. (See
Fig. 3.)
6. Avoid direct lineset contact with water pipes, ductwork, floor
joists, wall studs, floors, and walls.
2
A92471
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.)
Avoid contact between tubing and structureNOTE:
OUTDOOR WALL INDOOR WALL
CAULK
INSULATION
THROUGH THE WALL
HANGER STRAP
(AROUND VAPOR
TUBE ONLY)
1″ MIN.
→ Fig. 3—Piping Installation
SUSPENSION
LIQUID TUBE
VAPOR TUBE
JOIST
INSULATION
VAPOR TUBE
LIQUID TUBE
A94028
Fig. 4—Accessory Support Feet
COIL
THERMOSTATIC
EXPANSION
VALVE
A93567
SENSING
BULB
EQUALIZER
TUBE
8. Ensure that tubing insulation is pliable and completely surrounds the vapor tube.
9. When necessary, use hanger straps which are 1 in. wide and
conform to the shape of the tubing insulation. (See Fig. 3.)
10. Isolate the hanger straps from the insulation by using metal
sleeves bent to conform to the shape of the insulation.
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.
OUTDOOR UNITS CONNECTED TO FACTORY-APPROVED
INDOOR UNITS — Outdoor unit contains correct system refrigerant 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.)
REFRIGERANT TUBING — Connect refrigerant tubing to fittings on outdoor unit vapor and liquid service valves. (See Fig. 2.)
Table 1—Refrigerant Connections and Recom-
mended Liquid and Vapor Tube Diameters (In.)
UNIT
SIZE
→ 018 3/8 3/8 5/8 5/8
024-030 3/8 3/8 3/4 3/4
036-048 3/8 3/8 7/8 7/8
060 3/8 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.
LIQUID VAPOR
Connect
Diameter
Tube
Diameter
Connect
Diameter
Tube
Diameter
Fig. 5—Typical TXV Installation
10 O'CLOCK
2 O'CLOCK
SENSING BULB
STRAP
SUCTION TUBE
4 O'CLOCK
7
⁄
IN. OD & SMALLER
8
8 O'CLOCK
LARGER THAN
Fig. 6—Positioning of Sensing Bulb
To avoid valve damage while brazing, service valves must be
wrapped with a heat sinking material such as a wet cloth.
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.
3
7⁄
8
A88382
IN. OD
A81032
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