Equipment Grounding; Unit Power Wiring - Trane Cold Generator CG-SVX044F-EN Installation, Operation And Maintenance Manual

Equipment Grounding

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.
Provide proper grounding at the connection point provided in
the unit control panel.

Unit Power Wiring

WARNING
Hazardous Voltage!
Failure to disconnect power before servicing could
result in death or serious injury. Disconnect all electric
power, including remote disconnects before servicing.
Follow proper lockout/tagout procedures to ensure the
power can not be inadvertently energized.
The installing contractor must connect appropriate power
wiring (with fused disconnects) to the unit-mounted, non-fused
disconnect in the power section of the unit control panel.
Electrical schematics and component location drawings are
also mounted on the inside of the control panel door.
The unit power fused disconnect switch should be located in
the general area of the unit, to comply with NEC or local codes.
Some codes require line-of-sight disconnect locations. The
unit mounted non-fused disconnect can be used as an
emergency shutdown device.
Scroll Compressor Electrical Phasing
NOTICE
Compressor Damage!
Operating compressors in reverse rotation will cause
damage or failure of the compressor.
It is critical that proper rotation of the scroll compressors be
established before the machine is started. Proper motor
rotation requires confirmation of the electrical phase sequence
of the power supply. The motor is internally connected for
clockwise rotation with the inlet power supply phased "ABC" or
"L1, L2, L3".
The order in which the three voltage waveforms of a three-
phase system succeed one another is called phase sequence
or phase rotation. When rotation is clockwise, phase sequence
is usually called "ABC" and when counterclockwise, "CBA".
This direction may be reversed by interchanging any two of the
line wires. The possibility of interchanging the wiring makes a
phase sequence indicator necessary to quickly determine the
proper phase rotation.
CG-SVX044F-EN
Setting the Proper Electrical Phase
Sequence
Proper compressor motor electrical phasing can be quickly
determined and, if necessary, corrected before starting the unit.
Use a quality instrument, such as an Associated Research
Model 45 Phase Sequence indicator or equivalent and follow
this procedure:
1. Verify that all operating controls for the unit are in the "Off"
position.
2. Turn power to CICD unit "Off" using supply power
disconnect to the unit. Verify that power to CICD unit is "Off"
and that there is no voltage on "Line" or entering side of the
CICD panel mounted unit disconnect.
3. Connect the phase sequence indicator leads to the "Load"
or leaving side of the CICD unit panel mounted disconnect
as follows:
Phase Sequence Lead
Black (Phase A)
Red (Phase B)
Yellow (Phase C)
4. Turn power to CICD unit "On" using the supply power
disconnect to the unit
5. Read the phase sequence displayed on the indicator. The
"ABC" LED on the face of the phase indicator will glow if
phase sequence is ABC.
6. If the "CBA" indicator glows instead, turn power to CICD
unit "Off" using the supply power disconnect to the unit,
then verify that the power to the CICD unit is "Off" and that
there is no voltage on the "Line" side of the CICD panel
mounted unit disconnect. Reverse two wires on the "Line"
or entering side of the CICD panel mounted disconnect
switch. Turn power to CICD unit "On" and recheck phase
sequence (Step 5 above).
7. If phase sequence is correct, turn power to CICD unit "Off"
using the supply power disconnect to the unit. Verify that
power to the CICD unit is "Off" and that there is no voltage
on "Line" or entering side of the CICD panel mounted unit
disconnect. Remove the phase indicator and restore
power to the CICD unit.
Installation Electrical
Terminal ID
L1
L2
L3
31