Refrigeration Maintenance
108
Checking Compressor Oil
The compressor oil should be checked when there
is evidence of oil loss (oil leaks) or when
components in the refrigeration system have been
removed for service or replacement.
To check compressor oil level with an ambient air
temperature above 50 F (10 C):
Install a gauge
manifold on the compressor.
Operate the unit on Cool with a 10 psi (69 kPa)
minimum suction pressure and a 100 psi
(689 kPa) minimum discharge pressure for 15
minutes or more.
After the unit has maintained the above conditions
for 15 minutes, observe the oil level. The oil
should be 1/4 to 1/2 up in the sight glass.
To check compressor oil level with an ambient air
temperature below 10 C (50 F):
Run the unit
through a complete Defrost cycle. After
completing the Defrost cycle, run the unit on Cool
for ten minutes. Observe the oil level. The oil
should be 1/4 to 1/2 up in the sight glass.
If the box is empty, you can run the unit on the
Heat cycle instead of the Defrost cycle.
NOTE: Use refrigeration compressor oil ONLY.
Polyol Ester type, P/N 203-413 is required on
R-404A.
1. Sight Glass
Figure 58: X426 Compressor
SP2001
1
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