137
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. Recover refrigerant using approved methods.
2. Unsolder the inlet and outlet refrigerant
suction lines from the accumulator tank.
3. 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
accumulator tank.
3. Pressurize the low side and test for refrigerant
leaks. If no leaks are found, evacuate unit.
4. Charge the system with refrigerant. Check
refrigerant charge and compressor oil and add
as required.
Compressor
Removal
1. Recover the refrigerant from the unit using
approved methods.
2. Loosen and remove the compressor/electric
motor belt from the compressor pulley.
3. Unscrew the discharge line or fitting.
Unsolder the liquid injection line, and unbolt
the suction valve from the compressor.
4. Disconnect the thermister, unsolder liquid
injection line and the discharge line.
5. Remove the compressor stabilization bracket
and the compressor mounting bolts.
6. Lift the compressor out of the unit. Keep the
compressor ports covered to prevent dust, dirt,
etc., from falling into the compressor.
7. Unsolder the discharge line.
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. Solder in the discharge line.
2. Lift the compressor into the unit and install
the mounting bolts and the stabilization
bracket.
3. Install the service valve using new gaskets
soaked in refrigeration oil.
4. Reconnect the thermister, the discharge line,
and liquid injection line.
5. Pressurize the compressor and test for
refrigerant leaks.
6. If no leaks are found, evacuate the system.
Replace the compressor/electric motor belt
and adjust the tension.
7. Charge the system with refrigerant.
8. Operate the unit at least 30 minutes and then
inspect the oil level in the compressor. Add or
remove oil if necessary.
9. Check the refrigerant charge and add
refrigerant if needed.
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