Refrigeration Service Operations 11-3
Installation
1. Replace clutch from compressor crankshaft on Model 50 units, or on drive coupling on model 30 units.
2. Lift compressor into the unit and install the mounting bolts.
NOTE: The 8-pin compressor drive hub will only slide onto the coupling pins in one of two positions that are 180 degrees
apart.
3. Install suction and discharge service valves and torque to the correct value. Coat new o-ring or gasket with compressor oil.
Connect the high pressure cutout switch wires.
4. Reconnect the pilot solenoid valve and compound pressure gauge lines.
5. Pressurise the compressor and test for refrigerant leaks.
6. If no leaks are found, evacuate the compressor. Replace the compressor/electric motor belt and adjust the tension (SLe Model
50 and all SLX, SLXe and SLXi units).
7. Refit the belt guard on SLX, SLXe and SLXi units
8. Back seat the suction and discharge service valves.
9. Operate the unit at least 30 minutes and then inspect the oil level in the compressor. Add or remove oil if necessary.
10. Check refrigerant charge and add refrigerant if needed.
High Pressure Cutout Switch or High Pressure Cycle (Control) Switch
Removal
1. Pump down the compressor and equalize the pressure to 0 psig (0 bar). Ensure that pressure holds 0 psig and front seat the
discharge and suction service valves. Recover remaining refrigerant from the compressor head discharge service valve tube
before moving to next steps.
2. Disconnect the wires and remove switch from the compressor discharge manifold.
Installation
1. Apply a refrigerant locktite to the threads of switch.
2. Install and tighten switch and reconnect the wires.
3. Open the discharge service valve slightly to pressurise the compressor high side and test for leaks.
4. If no leaks are found, evacuate the compressor.
5. Open the suction and discharge service valves. Place the unit in operation.
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