JOHNSON CONTROLS
FORM 160.84-EG1 (617)
32
ELECTRICAL CONSIDERATIONS
Unit input conductor size must be in accordance with the National Electrical Code (N.E.C.),
or other applicable codes, for the unit full load amperes (FLA). Please refer to the sub-
mittal drawings for the FLA and Minimum Current Ampacity (MCA) specific to each ap-
plication. Flexible conduit should be used for the last several feet to the chiller in order to
provide vibration isolation. Table 2 lists the allowable variation in voltage supplied to the
chiller. The unit nameplate is stamped with the unit voltage, and frequency.
TABLE 1 - VOLTAGE VARIATIONS
FREQ.
RATED
VOLTAGE
NAMEPLATE
VOLTAGE
OPERATING VOLTAGE
MIN. MAX.
60 HZ
380 380 342 423
460 440/460/480 414 508
50 HZ
400 380/400 342 423
415 415 374 456
Starters – A separate starter is not required since the YMC² chiller is equipped with a fac-
tory installed unit mounted VSD.
Controls – No field control wiring is required since the OptiSpeed VSD is factory installed
as standard. The chiller including VSD is completely controlled by the control panel.
Copper Conductors – Only copper conductors should be connected to compressor mo-
tors and starters. Aluminum conductors have proven to be unsatisfactory when connected
to copper lugs. Aluminum oxide and the difference in thermal conductivity between copper
and aluminum cannot guarantee the required tight connection over a long period of time.
Displacement Power-Factor Correction Capacitors – The OptiSpeed VSD provides
automatic displacement power factor correction to a minimum of 0.97 at all operating
conditions, so additional capacitors are not required.
Branch Circuit Overcurrent Protection – The branch circuit overcurrent protection
device(s) should be a time-delay type, with a minimum rating equal to the next standard
fuse/breaker rating above the calculated value. Refer to the submittal drawings for the
specific calculations for each application.
Application Data (Cont'd)
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