Thermo King SB-190 30, Manual

Page: 83 / 119

Refrigeration Service Operations (Rev. 12/03)
73
5. Pressurize the low side and test for leaks. If no leaks are
found, evacuate the low side.
6. Clean the suction line to a bright polished condition.
Install the feeler bulb on the side of the suction line in
its former position. The feeler bulb must make good
contact with the suction line or operation will be faulty.
Wrap with insulating tape.
7. Replace the roadside and curbside evaporator access
panel mounting channels.
8. Replace the upper and lower rear access panels.
9. Open the refrigeration valves and place the unit in oper-
ation. Check the refrigerant charge and compressor oil.
Add as required.
ACCUMULATOR
Removal
1. Pump down the low side and equalize the pressure to
slightly positive.
2. If applicable, disconnect the water lines from the accu-
mulator.
3. Unsolder the inlet and outlet suction lines from the
accumulator.
CAUTION: Use a heat sink or wrap vibra-
sorber with wet rags to prevent damaging the
vibrasorber.
4. Disconnect the tee fitting from the accumulator tank.
5. Unbolt and remove the accumulator from the unit.
Installation
1. Place the accumulator in the unit and tighten the
mounting bolts and nuts.
2. Solder the inlet and outlet suction lines to the accumu-
lator.
CAUTION: Use a heat sink or wrap vibra-
sorber with wet rags to prevent damaging the
vibrasorber.
3. If applicable, connect the water lines to the accumulator
tank.
4. Connect the tee fitting and lines to the accumulator.
5. Pressurize the low side and test for refrigerant leaks. If
no leaks are found, evacuate the low side.
6. Open the refrigeration valves and place the unit in oper-
ation. Check the refrigerant charge and the compressor
oil, and add as required.
THREE-WAY VALVE REPAIR
NOTE: The three-way valve can be repaired in the unit if
leakage or damage to the Teflon seals should occur. There
is usually enough give in the copper tubing to separate the
three sections of the valve without unsoldering any tubes.
Removal/Disassembly
1. Recover the refrigerant charge.
2. Clean the exterior surface of the valve.
3. Remove the line from the three-way valve to the pilot
solenoid.
4. Loosen the four 1/4 in. Allen head screws (DO NOT
REMOVE OR CAP MAY POP OFF); use tool
P/N 204-424 to break the gasket at each side of the cen-
ter section.