PROCEDURE 5—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.
NOTE:
In some cases noise in the living area has been traced to gas pulsations from improper installation of equipment.
A.
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.
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.
5.)
8. Ensure that tubing insulation is pliable and completely surrounds the vapor tube.
9. When necessary, use hangar straps which are 1 in. wide and conform to the shape of the tubing insulation. (See Fig. 5.)
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.
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.
Refrigerant Tubing
Connect tubing to fittings on outdoor unit vapor and liquid service valves. (See Fig. 2.)
CAUTION: To avoid valve damage while brazing, service valves must be wrapped with a heat-sinking material such as
a wet cloth.
Table 1—Refrigerant Connections and Recommended Liquid and Vapor Tube Diameters (In.)
UNIT
SIZE
LIQUID
VAPOR
Connect
Diameter
Tube
Diameter
Connect
Diameter
Tube
Diameter
018
3/8
3/8
5/8
5/8
024-036
3/8
3/8
3/4
3/4
042
3/8
3/8
7/8
7/8
048, 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 your local distributor.
D.
Sweat Connection
Use refrigerant grade tubing. Service valves are closed from factory and ready for brazing. Remove plastic retainer covering threads of liquid
service valve and connect sweat/flare adapter provided to valve. (See Fig. 6.) 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. Consult local code requirements. Refrigerant tubing
and indoor coil are now ready for leak testing. This check should include all field and factory joints.
Fig. 3—Typical TXV Installation
A88382
THERMOSTATIC
EXPANSION
VALVE
EQUALIZER
TUBE
SENSING
BULB
COIL
Fig. 4—Positioning of Sensing Bulb
A81032
2 O'CLOCK
10 O'CLOCK
SENSING BULB
STRAP
SUCTION TUBE
8 O'CLOCK
4 O'CLOCK
7
/
8
″
O.D. & SMALLER
LARGER THAN
7
/
8
″
O.D.
—3—
