Thermo King SB-III 30 SR+, Manual

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63
Refrigeration Service Operations
NOTE: It is generally good practice to replace the filter drier whenever the high side is opened or when the low side is
opened for an extended period of time.
COMPRESSOR
Removal
1. Pump down the low side and equalize the pressure to
slightly positive.
2. Front seat the discharge and suction service valves.
Release the remaining refrigerant pressure from the
compressor.
3. Unbolt the discharge and suction service valves from
the compressor.
4. Disconnect the high pressure cutout switch and the
pilot solenoid line.
5. Support the compressor and remove the compressor
mounting bolts from the flywheel housing.
6. Lift the service valves out of the way.
7. Slide the compressor to the left until the coupling pins
are clear.
8. Remove the compressor from the front of the unit.
Keep the compressor ports covered to prevent dust,
dirt, etc., from falling into the compressor.
NOTE: When the compressor is removed from the
unit, the oil level should be noted, or the oil removed
from the compressor should be measured so that the
same amount of oil can be added before placing the
replacement compressor in the unit.
Installation
1. Slide the compressor into the unit.
2. Place the compressor in position and install the mount-
ing bolts.
NOTE: The compressor drive coupling will only slide
onto the coupling pins in either of two positions,
which are 180 degrees apart.
3. Install the service valves using new gaskets soaked in
compressor oil. Connect the high pressure cutout
switch and the pilot solenoid valve line.
4. Pressurize the compressor and test for refrigerant leaks.
5. If no leaks are found, evacuate the compressor.
6. Back seat the suction and discharge service valves.
7. Operate the unit at least 30 minutes and then inspect the
oil level in the compressor. Add or remove oil if neces-
sary.
8. Check the refrigerant charge and add refrigerant if
needed.
Compressor Coupling Removal
After the compressor has been removed from the unit use
the appropriate Allen tool provided with removal tool P/N
204-991 to loosen the center bolt which holds the coupling
to the compressor shaft.
1. Attach the tool to the coupling with the provided socket
head screws and spacers. Two sets of spacers are pro-
vided with the tool, use the short spacers with shallow
compressor mounting flanges and the longer set for
deeper flanges. The side with the countersunk holes
should be toward the coupling.