Thermo King 914970, Manual

Page: 130 / 186

Refrigeration Service Operations
128
3. Pressurize the refrigeration system and test for
leaks. If no leaks are found, evacuate the
system.
4. Recharge the unit with refrigerant and check
the compressor oil.
Pilot Solenoid
Removal
Non-Soldered Connections
1. Pump down the low side and equalize pressure
to slightly positive.
2. Disconnect the lines to the solenoid and
immediately cap to prevent moisture and air
from entering the system.
NOTE: The lines from the three-way valve to the
pilot solenoid will leak refrigerant at a high
velocity and should be capped.
3. Disconnect the electrical wires and remove the
pilot solenoid.
Soldered Connections
1. Recover the refrigerant
2. Disconnect the solenoid coil wires from the
main wire harness and remove the solenoid
coil from the solenoid valve.
3. Unsolder the lines from the solenoid valve and
remove from the unit.
Installation
Non-Soldered Connections
1. Replace the pilot solenoid in the unit.
2. Remove the caps from the lines and connect
lines to the pilot solenoid. Connect line from
the three-way valve first. Connect wires to the
valve.
3. Open the refrigeration valves and place the
unit in operation.
4. Check for leaks.
Soldered Connections
1. Clean the tubes for soldering.
2. Remove the solenoid coil from the solenoid
valve.
3. Place the valve in position and solder
connections.
4. Pressurize the refrigeration system and check
for leaks. If no leaks are found, evacuate the
system.
5. Recharge the unit with refrigerant.
Pressure Regulator Valve
Removal
1. Pump down the low side and equalize pressure
to slightly positive.
2. Release remaining pressure and unsolder
pressure regulator valve from the accumulator
tank and suction tube.
Installation
1. Clean the tubes for soldering.
2. Place the valve in position and solder
connections.
3. Pressurize the low side and check for leaks.
4. If no leaks are found, evacuate the low side.
5. Open the refrigeration valves, and place the
unit in operation. Check the refrigerant charge
and add refrigerant as required.
Receiver Tank
Removal
1. Remove the refrigerant charge.
2. Unsolder the inlet tube from the receiver tank.
3. Unsolder the filter drier line from the receiver
tank outlet tube.
4. Unbolt the mounting brackets and remove the
receiver tank from the unit.