Carrier 38YCC Installation And Start-Up Instructions Manual page 4

SERVICE
ACCESS
Fig. 5—Accessory Heat Pump Feet
Remove indoor coil piston if unit is to be installed on system
with a TXV metering device.
Step 7—Make Piping Connections
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 prevent compressor damage DO NOT bury more than 36
in. of refrigerant tubing. If ANY tubing is buried, provide 6
in. vertical rise at service valve.
To prevent damage to unit or service valves observe the
following:
• Use a brazing shield.
• Wrap service valves with wet cloth or use a heat sink
material.
Outdoor units may be connected to indoor section using accessory
tubing package or field-supplied refrigerant grade tubing of correct
size and condition. For tubing requirements beyond 50 ft (15.24m),
substantial capacity and performance losses can occur. Following
the recommendations in the Residential Split System Long-Line
Application Guideline will reduce these losses. Refer to Table 2
for accessory requirements.
For buried line applications greater than 36 in. (0.914m), refer to
Table 2 and Residential Split System Buried Line Application
Guideline. Buried line applications may not exceed 100 ft (30.5m).
If refrigerant tubes or indoor coil is exposed to atmosphere, it must
be evacuated to 500 microns to eliminate contamination and
moisture in the system.
OUTDOOR UNIT CONNECTED TO FACTORY-APPROVED
INDOOR UNIT — Outdoor unit contains correct system refriger-
ant charge for operation with indoor unit of same size when
connected by 15 ft (4.57m) of field-supplied or factory-accessory
tubing. Check refrigerant charge for maximum efficiency.
REFRIGERANT TUBING — Connect tubing to fittings on out-
door unit vapor and liquid service valves. (See Fig. 2 and 6.)
PISTON BODY
A97006
Fig. 6—Service Valve with Sweat Adapter Tube
SWEAT CONNECTION — Use refrigerant grade tubing. Service
valves are closed from factory and ready for brazing. After
wrapping service valve with a wet cloth, tubing set can be brazed
to service valve 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.
IMPORTANT: Check factory tubing on both indoor and outdoor
unit to ensure tubes are not rubbing against each other or any sheet
metal. Pay close attention to feeder tubes, making sure wire ties on
feeder tubes are secure and tight.
IMPORTANT: Always install a liquid line filter drier. Refer to
Product Data Digest for appropriate part number.
Step 8—Make Electrical Connections
To avoid personal injury or death, do not supply power to unit
with compressor terminal box cover removed.
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.
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 may fluctuate above or below
permissible limits.
NOTE: Use copper wire only between disconnect switch and
unit.
NOTE: Install branch circuit disconnect per local codes to handle
unit starting current. Locate disconnect within sight from and
readily accessible from unit per local codes.
4
PISTON
PISTON RETAINER
SWEAT/FLARE ADAPTER
A94029