Ingersoll-Rand Thermo King CRR DF MPC2000, Maintenance Manual

Page: 129 / 165

Refrigeration Maintenance and Service Operations
128
Compressor Replacement (R-134a or R-23 Systems)
Removal
1. Close the suction service valve and pump down the compressor:
• R-134a Compressor: Pump down the compressor to -35 kPa, -0.35 bar, 10 in. vacuum.
• R-23 Compressor: Pump down the compressor to 0 to 21 kPa, 0.0 to 0.2 bar, 0 to 3 psig.
2. Break the vacuum with nitrogen between 10 and 20 kPa, 0.10 and 0.20 bar, 1 and 3 psig.
NOTE: If the compressor does not operate, or the compressor is unable to pump the low side down, the
refrigerant charge must be reclaimed before service can be performed on the refrigeration system.
3. Front seat the discharge valve.
4. Remove discharge service valve and suction service valve from the compressor.
5. Disconnect the wire connector for the high pressure cutout switch.
6. Remove the three-phase electric power connection.
7. Remove the compressor mounting tray bolts and nuts.
8. Slide the compressor from the unit.
9. Keep the compressor ports covered to prevent dust, dirt, etc., from falling into the compressor.
NOTE: When the compressor is removed from the unit, 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 new compressor or repaired compressor in the unit.
Installation
1. Slide the compressor into the unit. Install mounting bolts, washers and nuts, and tighten.
2. Bolt the discharge valve to the compressor with a new gasket lightly coated with compressor oil. Bolt
the suction service valve to the compressor using a new O-ring coated with compressor oil.
3. Apply refrigerant locktite to the threads of the high pressure cutout switch. Install the switch and
connect the wire connectors.
4. Connect three-phase electric power to the compressor.
5. Pressurize the compressor with refrigerant gas:
• R-134 compressor with R-134a refrigerant.
• R-23 compressor with R-23 refrigerant.
CAUTION: Do NOT allow the R-23 scroll compressor to operate for more than 10-20 seconds.
CAUTION: Any time the discharge valve is front seated, disconnect the unit power source to
prevent accidental compressor start-up.
CAUTION: Be sure to add the correct refrigerant to the compressor.