Thermo King T-1000R, Maintenance Manual

Page: 208 / 282

Refrigeration Maintenance 10-24
Use the following procedure to change the compressor oil filter.
1. Pump down the low side and equalize the pressure to slightly positive.
2. Front seat the discharge and suction service valves.
3. Disconnect the oil lines from the compressor oil filter. Hold the oil filter with back-up wrench on the hex behind the ORS
fitting.
4. Remove the clamp and the compressor oil filter.
5. Coat the new O-rings with clean compressor oil and place them in the ORS fittings on the ends of the new compressor oil
filter.
6. Fasten the new compressor oil filter in place with the clamp.
7. Attach and tighten the oil lines to the compressor oil filter. Hold the oil filter with a back-up wrench on the hex behind the
ORS fitting.
8. Evacuate the compressor and filter to remove trapped air.
9. Open the service valves, operate the system, and check the compressor oil filter for leaks.
CHECKING COMPRESSOR OIL PRESSURE
The oil pressure at the oil pressure access port varies with the suction pressure in the compressor. Therefore, we need to
calculate the “net oil pressure” to determine the actual compressor oil pressure. The net oil pressure is the pressure at the oil
pressure access port minus the suction pressure after the electronic throttling valve (ETV) or suction pressure regulator (SPR).
This is measured at the suction service valve. Use the following procedure to check the compressor oil pressure.
1. Attach a gauge manifold to the suction service valve and discharge service valve.
2. Attach a suitable oil pressure gauge to the oil pressure access port on the compressor oil filter.
3. Start the unit and note the pressure at the oil pressure access port and the suction pressure at the suction service valve.
4. Subtract the suction pressure from the pressure at the oil pressure access port to get the net oil pressure.
1. Oil Pressure Access Port
2. Inlet Fitting
3. Outlet Fitting
Compressor Oil Filter
2
1
3