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48 TRG-TRC011-EN
notes
period four
Maintenance Considerations
Most purges are fully automatic and generally require less maintenance than
previous-generation manually operated purges. Purge-related maintenance
procedures are simple.
n Weekly: 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.
n Semiannually: Inspect the air-cooled condensing-unit coil and clean as
needed. A fouled coil will reduce purge efficiency and capacity. Change the
vacuum pump oil as needed.
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
pump-out activity over the last 24 hours to the 30-day average. The hermetic
integrity of the absorption chiller is critical to its operation. Any leaks should be
addressed immediately.
▲
◆ 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