82
TK 56433-5-MM-EN
Figure 103.
Internal Oil Filter
1.
Oil Discharge Tube
4.
Pressure Relief Valve
2.
O-Ring
5.
Oil Pickup Tube
3.
Internal Oil Filter
6.
Stud On Oil Pickup Tube Bracket
1. Remove the compressor from the unit if needed to
access the oil sump.
2. Remove the oil sump.
3. Remove the nut that fastens the internal oil filter to
the stud on the oil pickup tube bracket.
Figure 104.
Remove Nut from Stud
1.
Stud On Oil Pickup Tube Bracket
4. Remove the internal oil filter from the oil discharge
tube.
Figure 105.
Remove Internal Oil Filter from Oil
Discharge Tube
1.
Internal Oil Filter
2.
Oil Discharge Tube
5. Place the new internal oil filter on the oil discharge
tube and the stud on the oil pickup tube bracket. Be
careful to avoid damaging the O-ring in the oil filter.
6. Install and tighten the nut that fastens the internal
oil filter to the stud on the oil pickup tube bracket.
7. Install the oil sump.
8. Install the compressor in the unit if it was removed.
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 below the throttling
valve. Use the following procedure to check the
compressor oil pressure.
1.
Attach a suitable oil pressure gauge to the oil
pressure access port on the compressor oil filter, or
to the oil pressure access port on the oil pump
cover.
2.
Attach the low pressure gauge of a gauge manifold
to the fitting on the side of the throttling valve (or
suction valve adapter). This fitting allows you to
monitor the suction pressure in the compressor
below the throttling valve.
3.
Start the unit and note the pressure at the oil
pressure access port and the suction pressure
below the throttling valve.
4.
Subtract the suction pressure below the throttling
valve from the pressure at the oil pressure access
