Installation Electrical; General Recommendations - Trane Cold Generator CICD Series Installation, Operation And Maintenance Manual

Installation Electrical

WARNING
Proper Field Wiring and Grounding
Required!
Failure to follow code could result in death or serious
injury. All field wiring MUST be performed by qualified
personnel. Improperly installed and grounded field
wiring poses FIRE and ELECTROCUTION hazards. To
avoid these hazards, you MUST follow requirements for
field wiring installation and grounding as described in
NEC and your local/state electrical codes.

General Recommendations

WARNING
Hazardous Service Procedures!
Failure to follow all precautions in this manual and on
the tags, stickers, and labels could result in death or
serious injury.
Technicians, in order to protect themselves from
potential electrical, mechanical, and chemical hazards,
MUST follow precautions in this manual and on the
tags, stickers, and labels, as well as the following
instructions: Unless specified otherwise, disconnect all
electrical power including remote disconnect and
discharge all energy storing devices such as capacitors
before servicing. Follow proper lockout/tagout
procedures to ensure the power can not be
inadvertently energized. When necessary to work with
live electrical components, have a qualified licensed
electrician or other individual who has been trained in
handling live electrical components perform these
tasks.
NOTICE
Use Copper Conductors Only!
Failure to use copper conductors could result in
equipment damage as unit terminals are not designed
to accept other types of conductors.
The wiring procedures, as described in this portion of the
manual, must be accomplished to obtain proper operation
of the unit.
All wiring must comply with National Electrical Code
(NEC) and state and local requirements. Outside the
United States, the national and/or local electrical
requirements of other countries shall apply. The installer
must provide properly sized system interconnecting and
power supply wiring with appropriate fused disconnect
switches. Type and locations of disconnects must comply
with all applicable codes.
Minimum circuit ampacity, recommended fuse sizes and
other unit electrical data are provided
p. 10 and on the unit nameplate.
30
Checking the Power Supply
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 tolerances listed in this manual.
Total Supply Voltage
Live Electrical Components!
Failure to follow all electrical safety precautions when
exposed to live electrical components could result in
death or serious injury. When 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.
Measure each leg of the supply voltage at the line voltage
disconnect switches. For units with a nameplate voltage of
208/230 volt, the readings must fall within the range of 180-
253 volts. For units with a nameplate voltage of 460 volts,
the readings must fall within the range of 414-506 volts. If
voltage on any leg does not fall within tolerance, notify the
power company and request correction of this situation
before connecting to or operating the unit. Inadequate
voltage to the unit will shorten the life of relay contacts and
compressor motors.
Voltage Imbalance Between Phases
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 phases)
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:
The percentage of imbalance is then:
In the preceding example, 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
"Electrical Data,"
as much as 20 percent current imbalance with a resulting
WARNING
221 + 230 + 227 = 226 volts
3
100 (226 - 221) = 2.2%
226
CG-SVX044B-EN