COIL
SENSING
BULB
EQUALIZER
TUBE
THERMOSTATIC
EXPANSION
VALVE
A88382
Fig. 4ÐTypical TXV Installation
→VII. CHECK OUTDOOR CHECK-FLO-RATER® PISTON
Check outdoor unit piston. Remove retainer on liquid service valve and check piston size with matching number listed on outdoor unit rating plate.
→VIII. CHECK DEFROST THERMOSTAT
Check defrost thermostat to ensure it is properly located and securely attached. There is a liquid header with a brass distributor and feeder tube going into outdoor coil. At the end of 1 of the feeder tubes, there is a
FEEDER TUBE
STUB TUBE
DEFROST
THERMOSTAT
10 O'CLOCK
2 O'CLOCK
SENSING BULB |
STRAP |
SUCTION TUBE |
8 O'CLOCK | 4 O'CLOCK |
7⁄8 IN. OD & SMALLER | LARGER THAN 7⁄8 IN. OD |
| A81032 |
Fig. 5ÐPositioning of Sensing Bulb
CAUTION: 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
→For
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
Outdoor unit contains correct system refrigerant charge for opera- tion with indoor unit of same size when connected by 15 ft of
B.Refrigerant Tubing
A97517
Fig. 6ÐDefrost Thermostat Location
IX. MAKE PIPING CONNECTIONS
WARNING: 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
→CAUTION: If ANY refrigerant tubing is buried, provide a 6 in. vertical rise at service valve. Refrigerant tubing
lengths up to 36 in. may be buried without further special consideration. For lengths above 36 in., refer to Residen- tial Split System
Ð3Ð
Connect tubing to fittings on outdoor unit vapor and liquid service valves. (See Table 1.) Use refrigerant grade tubing.
C.Sweat Connection
CAUTION: To avoid valve damage while brazing, ser- vice valves must be wrapped in a
Remove plastic retainer holding outdoor piston in liquid service valve and connect sweat/flare adapter provided to valve. (See Fig. 7.) 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