Operating instructions

TM 11574A-OI
3-16
1. Discharge Valve Flange 8. Bottom Plate
2. High Side Pressure 9. Sight Glass
Connection 10. Oil Drain Plug
3. Low Side Pressure 11. Oil Charging Valve
Connection 12. Bearing Head
4. Suction Valve Flange 13. Oil Pump
5. Motor End Cover 14. Oil Fill Plug
6. Serial/Model No. Plate 15. Cylinder Head
7. Crankcase Heater 16. Valve Plate
Figure 3-6. Compressor.
(c) Checking compressor oil level. To check the compressor oil level perform the following
steps:
CAUTION
Use only Castrol Icematic SW20 compressor oil with R-134a. When using this
hygroscopic oil, immediately reseal. Do not leave container of oil open or contamination
will occur.
1
Operate the unit in cooling mode for at least 20 minutes.
2
Check the front oil sight glass on the compressor to ensure that no foaming of the oil
is present after 20 minutes of operation. If the oil is foaming excessively after 20
minutes of operation, check the refrigerant system for flood-back of liquid refrigerant.
Correct this situation before performing step 3
.
3
Turn unit off to check the oil level. The correct oil level range should be between the
bottom to one-eighth level of the sight glass. If the level is above one-eighth, oil must
be removed from the compressor. To remove oil from the compressor, follow step f
in this section. If the level is below the bottom of the sight glass, add oil to the
compressor following step e below.