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.
A. 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.
B. Refrigerant Tubing
Connect tubing to fittings on outdoor unit vapor and liquid service
valves. (See Table 1.) Use refrigerant grade tubing.
C. Install Liquid-Line Filter Drier (If applicable)
If a filter drier is included refer to Fig. 4 and install filter drier as
follows:
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.
D. Sweat Connection
CAUTION: To avoid valve damage while brazing, ser-
vice valves must be wrapped in a heat-sinking material
such as a wet cloth.
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.
VII. INSTALL SOLENOID VALVE IN LIQUID TUBE
(IF REQUIRED)
CAUTION: Not all applications require use of a liquid
tube solenoid valve. If your unit has been shipped with a
liquid tube solenoid valve in the unit, it must be installed
for performance enhancement. The liquid tube solenoid
valve must be energized during evacuation for complete
removal of refrigerant.
→ TABLE 1—REFRIGERANT CONNECTIONS AND RECOMMENDED LIQUID AND VAPOR TUBE DIAMETERS (IN.)
UNIT
SIZE
LIQUID VAPOR VAPOR (LONG LINE)
Connection Diameter Tube Diameter Connection Diameter Tube Diameter Connection Diameter Tube Diameter
024 3/8 3/8 5/8 5/8 5/8 3/4
030, 036 3/8 3/8 3/4 3/4 3/4 7/8
042, 048 3/8 3/8 7/8 7/8 7/8 1-1/8
060 3/8 3/8 7/8 1-1/8 7/8 1-1/8
NOTES:
1. Tube diameters are for lengths up to 50 ft. For tubing lengths greater than 50 ft, consult Residential Long-Line Application Guideline.
2. Do not apply capillary tube indoor coils to these units.
→ TABLE 2—ACCESSORY USAGE
ACCESSORY
REQUIRED FOR
LOW-AMBIENT
APPLICATIONS
(BELOW 55°F)
REQUIRED FOR
LONG-LINE
APPLICATIONS*
(OVER 50 FT)
REQUIRED FOR
BURIED LINE
APPLICATIONS†
(OVER 3 FT)
REQUIRED FOR
SEA COAST
APPLICATIONS
(WITHIN 2 MILES)
Crankcase Heater Yes Yes Yes No
Evaporator Freeze Thermostat Yes No No No
Winter Start Control Yes‡ No No No
Accumulator No No Yes No
Compressor Start Assist
Capacitor and Relay
Yes Yes Yes No
Low-Ambient Controller,
MotorMaster® Control,
or
Low-Ambient Pressure Switch
Yes No No No
Wind Baffle See Low-Ambient Instructions No No No
Coastal Filter No No No Yes
Support Feet Recommended No No Recommended
Liquid-Line Solenoid Valve
or
Hard Shutoff TXV
No
See Long-Line
Application
Guideline
Yes No
Ball Bearing Fan Motor Yes** No No No
* For tubing line sets between 50 and 175 ft, refer to Residential Split System Long-Line Application Guideline.
† For buried line applications, refer to Residential Split System Buried-Line Application Guideline.
‡ Only when low-pressure switch is used.
** Required for Low-Ambient Controller (full modulation feature) and MotorMaster Control only.
Fig. 4—Liquid-Line Filter Drier
A98126
LIQUID-LINE
FILTER-DRYER
CONNECTOR
TUBE
—3—
→
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