ClimaCool UCR 30, 50 and 70 tons Manual - Manual (Page 22)

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22
Proper Voltage Balance
Occasionally, in three phase circuits, a voltage imbalance
occurs between phases. It is not
recommended to operate equipment when an imbalance
greater that 2% occurs. This causes motors to run at high
temperatures and may aff ect their longevity. The following
example describes how to calculate the average voltage of
the three phases to see if the imbalance is greater than 2%.
Example:
Line one = 226v Line two = 230v Line three =
228v
The average is: 226+230+228 = 228v
Next, 100(228-226) = 0.9%
228
The voltage imbalance of the three phase circuit is 0.9%. This
is well under the 2% range.
Voltage/Phase Monitor
Voltage/phase monitors are factory supplied for fi eld
installation with the CoolLogic Master Control Panel. The
voltage/phase monitor helps guard the chiller bank against
voltage fl uctuations, phase failure or phase reversal
conditions. The voltage/phase monitor has three wires
that connect to the main three phase power chiller bank
input. Two low voltage control wires are connected to the
CoolLogic Master Control Panel and must be run together
with the power wiring. Do not install control wiring in the
same conduit as line voltage wiring or with wires that switch
highly inductive loads such as contactor and relay coils.
WARNING!
WARNING! To avoid possible injury or death due to electrical
shock, open the power supply disconnect switch and secure it
in an open position during installation.
CAUTION!
CAUTION! Use only copper conductors for field installed
electrical wiring. Unit terminals are not designed to accept
other types of conductors.
SAFETY WARNING
High voltage is used to operate this equipment. Failure to observe standard electrical safety procedures may result
in serious injury. Only persons qualified and / or properly trained should attempt to install, operate and maintain this
equipment. These chillers come fully charged with refrigerant. Installation, and start – up should be accomplished by
technicians who are fully certified to handle refrigerants, as required by 40 CRF Part 82, subpart F of the Recycling
and Emissions Reduction Act. Scroll compressors are used in this equipment. Phase verification is required for proper
rotation direction. Incorrect rotation will result in elevated sound and internal overload trip failure.