20
CXRC-SVX01J-EN
cause control components to malfunction and shorten
the life of relay contacts and condenser fan motors.
Voltage Imbalance
Excessive voltage imbalance between phases in a
three-phase system can cause motors to overheat and
eventually fail. Maximum allowable imbalance is 2%.
Voltage imbalance is defined as 100 times the
maximum deviation of the three voltages (three
phases) subtracted from the average (without regard to
sign) divided by the average voltage.
EExxaammppllee
• L1 measured = 221 V
• L2 measured = 230 V
• L3 measured = 227 V
NNoottee:: L1 = 221 volts is the maximum deviation of the 3
voltages from the average of the 3 voltages.
Therefore, the imbalance percentage is:
The 2.2 % imbalance that exists in the example above
exceeds the maximum allowable imbalance between
phases.
Table 5. CCRC/CIRC Condenser Electrical Data
Tons
Voltage
# Fans
FLA (ea.) LRA (ea.)
MCA MCB
20, 29, 32
200 4 4.1 20.7 17.4 20
460 4 1.8 9 7.7 15
575 4 1.4 7.2 5.9 15
35, 40
200 6 4.1 20.7 25.6 30
460 6 1.8 9 11.2 15
575 6 1.4 7.2 8.8 15
50, 60
200 8 4.1 20.7 33.8 40
460 8 1.8 9 14.8 15
575 8 1.4 7.2 11.5 15
Note: All motors for CCRC/CIRC units are rated at 1 hp (0.7457 kW).
IInnssttaallllaattiioonn —— EElleeccttrriiccaall
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