MODEL PCA090480WH
CHAPTER 2
SERVICE
Section 3: Refrigeration Basics and Service
2-3
March 2013
Page 42
Proprietary/Confidential
© 2013 Twist, Inc.
D.
Adding or Removing Oil
Visually check the oil level in the compressor. The oil level should be
visible in or slightly above the center of the sight glass but not below it.
Keep in mind that some slight fluctuation in oil level may occur during an
operating cycle. As long as the oil level is maintained well within the
sight glass, such fluctuations are not harmful. On two compressor sets,
one compressor oil level could be below the sight glass when it is first
started but should come back after five minutes.
NOTE:
If the oil is black in color, call a qualified service technician
because the oil is contaminated and should be replaced.
Unless there are particular reasons for changing the oil, do not
change it. The oil does not deteriorate or wear out with normal
usage.
Excess oil can be removed from the compressors’ crankcase at the Oil
Charging Valve, which is located beneath the oil level of the
compressor. To remove oil, connect a manifold hose to the Oil
Charging Valve connection, open the manifold valve slowly, and allow
the oil to run into a suitable container. Take special care when
removing the oil because of oil foaming. The foaming not only may
cause the oil to overflow from the container into which it is being drained
but also make it difficult to determine the amount of oil being removed.
When sufficient oil has been drained, close the manifold valve tightly
and start the compressor. Allow the compressor to run for
approximately one-half hour and then recheck the oil level.
For
adding
oil:
(1)
Insert an oil pump into the oil container until it touches the bottom
and push the universal stopper down into the neck opening of the
container. (A little oil will keep the stopper from sticking.) The
function of the stopper is to stabilize the pump and keep out
contamination.
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