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 TM 9-4120-425-14&P
SOLENOID VALVES AND HOT GAS BY-PASS VALVE
DIRECT SUPPORT MAINTENANCE REPLACEMENT Continued
0067-00
TEST- Continued
Liquid Line Solenoid Valve (1) - Continued
5.
If no magnetic attraction of coil to valve, problem is electrical and not the solenoid valve.
6.
If observations in step 2 and step 3 are not as stated, solenoid valve is defective and must be replaced.
Hot Gas By-Pass Valve (5)
NOTE
This is a test for valve operation and the maintenance of suction refrigerant pressure
above 50 psig (freezing temperature) to prevent evaporator coil freeze-up.
1.
Connect service gauges to service valves and observe system pressure when operating in the "cooling mode" with
temperature selector switch in the coolest position.
2.
Block indoor air return and note refrigerant suction pressure reading.
3.
Suction pressure should be above 55 psig under normal operation and blocked indoor air return conditions.
4.
If suction pressure is above 55 psig under normal operation and below 55 psig under blocked indoor air return
condition, adjust the valve as follows:
a.
Remove top rear cover and large valve cap on top of valve to expose adjustment stem. Turn adjustment stem
clockwise until suction pressure is above 55 psig.
b.
If adjustment does not result in the suction pressure above 55 psig, valve is defective and must be replaced.
WARNING
Ensure power source is disconnected. Ensure refrigerant system is discharged.
REMOVAL
1.
Tag and disconnect coil wires. Remove coils (2 and 4) (See WP 0039-00).
NOTE
Solenoid coil (2) is a 24 V ac coil. Solenoid coil (4) is a 208 V ac coil.
2.
Debraze all tubing connected to valves (1), (3) or (5) (See WP 0051-00).
3.
Remove valves from unit.
INSTALLATION
1.
After noting arrow direction on each valve body, place tubing connections (6) onto valves (1), (3) or (5).
2.
Braze the tube joints (See WP 0051-00).
0067-00-3
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