Thermo King KD-II SR, Manual

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107
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.
ACCUMULATOR
Removal
1. Pump down the low side and equalize the pressure to
slightly positive.
2. Drain the engine cooling system. Disconnect the cool-
ant lines from the accumulator tank.
3. Unsolder the inlet and outlet refrigerant suction lines
from the accumulator tank.
4. Unbolt and remove the accumulator from the unit.
Installation
1. Place the accumulator in the unit and tighten the
mounting bolts.
2. Solder the inlet and outlet suction lines to the accumu-
lator tank.
3. Pressurize the low side and test for refrigerant leaks. If
no leaks are found, evacuate the low side.
4. Connect the coolant hoses to the accumulator tank and
refill the cooling system with 50/50 ethylene glycol/
water solution.
5. Open the refrigeration valves and place the unit in oper-
ation. Check refrigerant charge and compressor oil and
add as required.
COMPRESSOR
Removal
1. Pump down the compressor and equalize the pressure
to slightly positive.
2. Loosen and remove the compressor/electric motor belt
from the compressor pulley.
3. Front seat the discharge and suction service valves.
Release remaining refrigerant pressure from the com-
pressor.
4. Unbolt the discharge valve and the suction valves from
the compressor.
5. Remove the high pressure cutout switch and disconnect
the pilot valve and compound pressure gauge (optional)
hoses.
6. Remove the compressor mounting bolts.
7. Lift the compressor out of the unit. Keep the compres-
sor 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. Lift the compressor into the unit and install the mount-
ing bolts.
2. Install the service valves using new gaskets soaked in
refrigeration oil. Install the high pressure cutout switch.
3. Reconnect the pilot valve and compound pressure
gauge hoses.
4. Pressurize the compressor and test for refrigerant leaks.
5. If no leaks are found, evacuate the compressor.
Replace the compressor/electric motor belt and adjust
the tension.
6. Back seat the suction and discharge service valves.