135
CURRENT UNBALANCE (Maximum 10%)
Voltage unbalance will cause a current unbalance, but a cur-
rent unbalance does not necessarily mean that a voltage
unbalance exists. A loose terminal connection or a build-up
of dirt or carbon on one set of contacts (using the example of
L1 as the problem leg) would cause a higher resistance on
that leg (L1) than on L2 and L3. The current follows the
path of least resistance, so the current increases in legs L2
and L3. Higher current causes more heat to be generated in
the motor windings.
Percent (%) of current unbalance is calculated in the same
way as voltage unbalance (see the previous section), with a
maximum acceptable current unbalance of 10%.
5.0 COMPRESSOR SERVICE WORKSHEETS
Carlyle recommends that the Compressor Service Work-
sheets (pages 136 and 137) be copied (and enlarged, if pre-
ferred) and filled out for each compressor at initial start-up
and each time the compressor is serviced. Comparing the
data from current worksheets to past records will allow the
service technician to diagnose system changes and prevent
compressor failures. This information is also very useful in
preventing a repeat failure.
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