period four
Maintenance Considerations
notes
▲ 
◆Check level of liquid refrigerant in purge condensing unit
◆Check vacuum pump oil
▲
◆Inspect purge condensing coil and clean as necessary
◆Change vacuum pump oil as needed
Figure 57
Most purges are fully automatic and generally require less maintenance than
νWeekly: With the purge unit operating, check the purge tank condensing activity by observing the liquid refrigerant level in the sump sight glass and checking the vacuum pump oil.
νSemiannually: Inspect the
As mentioned in Period Three, the purge can be used to indicate an air leak or depletion of the corrosion inhibitor. Leaks can be detected early by comparing
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