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Power Supply Wiring
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/national
electrical codes.
Three-Phase Power
Review and follow the guidelines in this section to properly
install and connect the power supply wiring to the starter
panel:
•
Verify that the starter nameplate ratings are compatible
with the power supply characteristics and with the
electrical data on the unit nameplate.
NOTICE
Adaptive Frequency Drive (AFD)/Starter
Component Damage!
Failure to remove debris from inside the AFD/starter
panel could result in an electrical short and could
cause serious AFD/starter component damage.
NOTICE
Use Copper Conductors Only!
Failure to use copper conductors could result in
equipment damage as the equipment was not
designed or qualified to accept other types of
conductors.
•
Do NOT modify or cut enclosure to provide electrical
access. Removable panels have been provided and
any modification should be done away from the
enclosure. If the starter enclosure must be cut to
provide electrical access, exercise care to prevent
debris from falling inside the enclosure.
•
Use copper conductors to connect the three-phase
power supply to the remote- or unit-mounted starter
panel.
•
Flexible conduit connections are recommended to
enhance serviceability and minimize vibration
transmission.
•
Size the power supply wiring in accordance with
National Electric Code (NEC), using the RLA value
stamped on the chiller nameplate and transformer load
on L1 and L2.
60
•
Confirm that wire size is compatible with lug size stated
in unit submittal.
•
Make sure that the incoming power wiring is properly
phased; each power supply conduit run to the starter
must carry the correct number of conductors to ensure
equal phase representation.
Note: Connect L1, L2, and L3 (shown in the following
figure) per starter diagram provided with chiller.
•
When installing the power supply conduit, ensure that
the position of the conduit does not interfere with the
serviceability of any of the unit components, or with
structural members and equipment. Ensure that the
conduit is long enough to simplify any servicing that
may be necessary in the future (e.g., starter).
•
Electrical wire torque specifications — follow starter
manufacturers torque specifications.
Figure 38. Proper phasing for starter power supply
wiring
L3 L2 L1 G
G
L3 L2 L1
Circuit Breakers and Fused
Disconnects
Any field-supplied circuit breaker or fused disconnect
installed in power supplied to the chiller must be sized in
compliance with National Electric Code (NEC) or local
guidelines.
Power Factor Correction
Capacitors (Optional)
Power factor correction capacitors (PFCCs) are designed
to provide power factor correction for the compressor
motor. PFCCs are available as an option for unit- and
remote-mounted starters.
L3 L2 L1 G L3 L2 L1 G
G
L3 L2 L1
CVHE-SVX005C-EN
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