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7
Step 5 — Make Electrical Connections
FIELD POWER SUPPLY — All units except 208/230-v
units are factory-wired for the voltage shown on the unit name-
plate. If the 208/230-v unit is to be connected to a 208-v power
supply, the transformer must be rewired by disconnecting the
black wire from the 230-v
1
/
4
-in. male spade terminal on the
transformer and connecting it to the 208-v
1
/
4
-in. male spade
terminal from the transformer.
Refer to the unit label diagram for additional information.
Pigtails are provided for field wire connections. Use factory-
supplied splices or a UL (Underwriters’ Laboratories) approved
copper/aluminum connector.
When installing units, provide a disconnect per the NEC.
All field wiring must comply with the NEC and local re-
quirements. In Canada, electrical connections must be made in
accordance with CSA (Canadian Standards Association) C22.1
Canadian Electrical Code Part One.
Install field wiring as follows:
1. Install conduit through the side panel openings. For units
without electric heat, install conduit between the discon-
nect and control box.
2. Install power lines to terminal connections as shown in
Fig. 7.
3. For units with electric heat, refer to Table 2 and Accessory
Installation Instructions.
During operation, voltage to compressor terminals must be
within range indicated on unit nameplate (see Tables 3A and
3B). On 3-phase units, voltages between phases must be bal-
anced within 2%, and the current within 10%. Use the formula
shown in Tables 3A and 3B, Note 2 on page 11 to determine
the percentage of voltage imbalance. Operation on improper
line voltage or excessive phase imbalance constitutes abuse
and may cause damage to electrical components. Such opera-
tion would invalidate any applicable Carrier warranty.
Unit cabinet must have an uninterrupted, unbroken electri-
cal ground to minimize the possibility of personal injury if
an electrical fault should occur. This ground may consist of
electrical wire connected to unit ground lug in control com-
partment, or conduit approved for electrical ground when
installed in accordance with NEC (National Electrical
Code) ANSI (American National Standards Institute)/
NFPA (National Fire Protection Association) 70 latest year
and local electrical codes. Failure to follow this warning
could result in the installer being liable for personal injury
of others.
LEGEND
Fig. 7 — Power Wiring Connections
C—Contactor
COMP — Compressor
IFC — Indoor-Fan Contactor
NEC — National Electrical Code
TB — Terminal Block
Field Wiring
Factory Wiring
Splice Connection
(Factory-Supplied)
208/230-3-60
460-3-60
575-3-60