Thermo King 920000, Manual

Page: 119 / 190

Refrigeration Service Operations
119
Installation
1. Place the new o-rings in the ORS fittings on
the ends of the drier.
2. Install the new drier and tighten the mounting
screws and nuts.
3. Install and tighten the inlet ORS nut. Hold the
drier with a back-up wrench on the hex behind
the ORS fitting.
4. Release a small amount of refrigerant to purge
the air through the drier. Then tighten the
outlet ORS nut.
5. Pressurize the system and inspect for leaks. If
no leaks are found open the refrigeration
valves and place the unit in operation.
High Pressure Cutout Switch
and Receiver Tank Pressure
Cutout Switch
Removal
1. Pump down the low side and equalize the
pressure in the high side to slightly positive.
2. Disconnect the wires and remove the high
pressure cutout switch from the compressor.
Installation
1. Apply a refrigerant locktite to the threads of
the high pressure cutout switch.
2. Install and tighten the high pressure cutout
switch and reconnect the wires.
3. Pressurize the refrigeration system and test for
leaks.
4. If no leaks are found, open the refrigeration
valves and place the unit in operation.
High Pressure Relief Valve
Removal
1. Remove the refrigerant charge.
2. Remove the high pressure relief valve.
Installation
1. Apply a refrigerant oil to the O-ring on the
high pressure relief valve.
2. Install and tighten the high pressure relief
valve.
3. Pressurize the refrigeration system and test for
leaks. If no leaks are found, evacuate the
system.
4. Recharge the unit with refrigerant.
Accumulator
Removal
1. Pump down the low side and equalize the
pressure to slightly positive.
2. Drain the engine cooling system.
3. Disconnect the water hoses.
4. Remove the mounting bolts from the
accumulator tank mounting brackets.
5. Unsolder the refrigerant lines from the tank.
6. Lift the accumulator tank from the unit.
CAUTION: Do not stand under the
accumulator tank when removing the
suction line. The tank or the suction line
may leak oil.