Thermo King 920000, Manual

Page: 121 / 190

Refrigeration Service Operations
121
Condenser Inlet Check Valve
Replacement
Removal
1. Remove the refrigerant charge.
2. Unsolder the lines and remove the check
valve.
NOTE: Disassemble the valve before
unsoldering.
Installation
1. Clean the tubes for soldering.
2. Place the disassembled check valve in
position. The arrow on the valve body
indicates the direction of refrigerant flow
through the valve.
3. Solder the inlet and outlet connections. After
the valve cools, reassemble the valve.
4. Pressurize the refrigeration system and test for
leaks.
5. If no leaks are found, evacuate the system.
6. Recharge the unit with the proper refrigerant.
Suction Line Check Valve and
Purge Check Valve Repair
Removal
1. Pump down the low side and equalize the
pressure to slightly positive.
2. Remove the cap nut from the check valve, and
remove the spring and seat.
Installation
1. Inspect the inside of the check valve body for
damage or foreign particles which might
adhere to the seat and damage the new seat. If
the body is damaged, replace the check valve.
2. Install the new seat and spring. Place a new
gasket on the cap and torque to 45 ft-lb
(61 N•m).
3. Pressurize the low side and test for leaks.
4. If no leaks are found, evacuate the system.
5. Open the refrigeration valves and place the
unit in operation. Check the compressor oil.
Suction Line Check Valve and
Purge Check Valve
Replacement
Removal
1. Pump down the low side and equalize the
pressure to slightly positive.
2. Unsolder the lines and remove the check
valve.
NOTE: Disassemble the valve before
unsoldering.
Installation
1. Clean the tubes for soldering.
2. Place the disassembled check valve in
position. The arrow on the valve body
indicates the direction of refrigerant flow
through the valve.
3. Solder the inlet and outlet connections. After
the valve cools, reassemble the valve.
4. Pressurize the low side and test for leaks.
5. If no leaks are found, evacuate the system.
6. Open the refrigeration valve and place the unit
in operation. Check the compressor oil.