Refrigerant Tubing - Carrier 38YRA Installation And Start-Up Instructions Manual

Table 1—Refrigerant Connections and Recommended Liquid and Vapor Tube Diameters (In.)
UNIT
SIZE
Connection Diameter
018 3/8
024 3/8
030 3/8
036 3/8
042, 048 3/8
060 3/8
NOTES:
1. Tube diameters are for lengths up to 50 ft. For tubing lengths greater than 50 ft, consult Residential Split System Long-Line Application Guideline.
2. Do not apply capillary tube indoor coils to these units.
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, substan-
tial 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 1
for field tubing equivalent line length. Refer to Table 2 for
accessory requirements.
For buried-line applications greater than 36 in., consult your local
distributor.
If refrigerant tubes or indoor coil are exposed to atmosphere, they
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 refrigerant charge for opera-
tion with indoor unit of same size when connected by 15 ft of
field-supplied or factory-accessory tubing. Check refrigerant
charge for maximum efficiency.
ACCESSORY
Crankcase Heater
Evaporator Freeze Thermostat
Accumulator
Compressor Start Assist
Capacitor and Relay
Low-Ambient Controller,
MotorMaster® Control,
or
Low-Ambient Pressure Switch
Wind Baffle
Support Feet
Liquid-Line Solenoid Valve
or
Hard Shutoff TXV
Ball Bearing Fan Motor
* For tubing line sets between 50 and 175 ft, refer to Residential Split System Long-Line Application Guideline.
‡ Required for Low-Ambient Controller (full modulation feature) and MotorMaster Control only.
LIQUID
Tube Diameter Connection Diameter
3/8
3/8
3/8
3/8
3/8
3/8
Table 2—Accessory Usage
VAPOR
Tube Diameter
5/8 5/8
3/4 3/4
3/4 3/4
7/8 7/8
7/8 7/8
7/8 1-1/8

REFRIGERANT TUBING

Connect tubing to fittings on outdoor unit vapor and liquid service
valves. (See Table 1.) Use refrigerant grade tubing.
SWEAT CONNECTION
To avoid valve damage while brazing, service valves must be
wrapped in a heat-sinking material such as a wet cloth.
Remove plastic retainer holding outdoor piston in liquid service
valve and connect sweat/flare adapter provided to valve. (See Fig.
8.) Connect refrigerant tubing to fittings on outdoor unit vapor and
liquid service valves. 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 require-
ments. Refrigerant tubing and indoor coil are now ready for leak
testing. This check should include all field and factory joints.
IMPORTANT: Check to be certain factory tubing on both indoor
and outdoor unit has not shifted during shipment. 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.
REQUIRED FOR
LOW-AMBIENT
APPLICATIONS
(BELOW 55°F)
Yes
Yes
No
Yes
Yes
See Low-Ambient Instructions
Recommended
No
Yes‡
4
VAPOR (LONG LINE)
Connection Diameter Tube Diameter
5/8
3/4
3/4
7/8
7/8
7/8
REQUIRED FOR
LONG-LINE
APPLICATIONS*
(OVER 50 FT)
Yes
No
No
Yes
No
No
No
See Long-Line
Application
Guideline
No
3/4
3/4
7/8
7/8
1-1/8
1-1/8