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Figure 6-5-Continued.
make sure the compressor is cool to the touch. Otherwise,
for R-22. If no fault is found and if the normal
a false indication may be obtained due to internal motor
values for winding resistance are known, check
protectors being open.
and record stator currents for balance by the
(f) Check the compressor motor to see if
wattmeter or ohmeter method. Use rated meters.
it is electrically grounded or open. A 500-volt
Note. A slight unbalance in stator currents may
magger or an ohmeter can be used for making
occur. An appreciable unbalanced phase indicates a
the test. Typical magger readings are 5 megohms
6-11
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