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Installation Electrical
Unit Voltage
Electrical power to the unit must meet stringent requirements for the unit to operate
properly. Total voltage supply and voltage imbalance between phases should be
within the following tolerances.
WARNING
Hazardous Voltage!
During installation, testing, servicing and troubleshooting of this
product, it may be necessary to work with live electrical components.
Have a qualified licensed electrician or other individual who has been
properly trained in handling live electrical components perform these
tasks. Failure to follow all electrical safety precautions when exposed to
live electrical components could result in death or serious injury.
Voltage Supply
Measure each leg of supply voltage at all line voltage disconnect switches. Readings
must fall within the voltage utilization range shown on the unit nameplate. If voltage
on any leg does not fall within tolerance, notify the power company to correct this
situation before operating the unit. Inadequate voltage to the unit will cause control
components to malfunction and shorten the life of relay contacts and compressor
motors.
Voltage Imbalance
Excessive voltage imbalance between phases in a three-phase system will cause
motors to overheat and eventually fail. Maximum allowable imbalance is 2 percent.
Voltage imbalance is defined as 100 times the maximum deviation of the three
voltages (three phase) subtracted from the average (without regard to sign), divided
by the average voltage.
Example:
If the three voltages measured at the line voltage fused disconnect are 221 volts, 230
volts and 227 volts, the average would be:
221+230+227
= 226 Volts
3
The percentage of imbalance is then:
100(226-221)
= 2.2%
226
In the example above 221 is used because it is the farthest from the average. The 2.2
percent imbalance that exists exceeds maximum allowable imbalance by 0.2 percent.
This much imbalance between phases can equal as much as 20 percent current
imbalance with a resulting increase in winding temperature that will decrease
compressor motor life.
Control Power Supply
A panel-mounted control power transformer is standard on all units.
Modules Connections for Interconnecting Wiring
The wiring procedures described in this portion of the manual must be completed
panel mounted LLIDs. Refer to Filed Wiring on page 95.
48
CGWF-SVX01A-EN
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