10. Isolate the hangar 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.
CAUTION: 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.
Table 1—Refrigerant Connections and Recommended Liquid and Vapor Tube Diameters (In.)
UNIT SIZE
LIQUID
VAPOR
Connect Diameter
Tube Diameter
Connect Diameter
Tube Diameter
024
3/8
3/8
5/8
5/8
030, 036
3/8
3/8
3/4
3/4
042, 048
3/8
3/8
7/8
7/8
060
3/8
3/8
7/8
1-1/8
Tube diameters are for lengths up to 50 ft. For tubing lengths greater than 50 ft, consult your local distributor or the Long-Line Application Guideline.
B.
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 Procedure 9—Checking Charge.)
C.
Install Solenoid Valve in Liquid Tube
CAUTION: All models require liquid line solenoid for performance enhancement. Solenoid valve must be energized
during evacuation for complete removal.
Fig. 3—Piping Installation
A92469
OUTDOOR WALL
CAULK
INDOOR WALL
LIQUID LINE
VAPOR LINE
INSULATION
JOIST
INSULATION
HANGER STRAP
(AROUND VAPOR
LINE ONLY)
VAPOR LINE
LIQUID
LINE
THROUGH THE WALL
SUSPENSION
1
″
MIN
NOTE:
AVOID CONTACT BETWEEN TUBING AND STRUCTURE
—3—
