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 terminal wire on the transformer and
connecting it to the 200-v red terminal of the transformer. The
end of the orange wire must then be insulated.
Refer to unit label diagram for additional information.
Pigtails are provided for field wire connections. Use factory-
supplied splices or 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 side panel openings. For units
without electric heat, install conduit between disconnect
and control box.
2. Install power lines to terminal connections as shown in
Fig. 8.
3. For units with electric heat, refer to Accessory Installation
Instructions.
During operation, voltage to compressor terminals must be
within range indicated on unit nameplate (see Table 2). On
3-phase units, voltages between phases must be balanced with-
in 2%, and the current within 10%. Use the formula shown in
Table 2, Note 2 on page 10 to determine the percentage of volt-
age imbalance. Operation on improper line voltage or exces-
sive phase imbalance constitutes abuse and may cause damage
to electrical components. Such operation would invalidate any
applicable Carrier warranty.
See Table 3 for electric heater and single point box usage.
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
C
—
Contactor
COMP(S) —
Compressor
IFC
—
Indoor (Evaporator) Fan Contactor
NEC
—
National Electrical Code
OFC
—
Outdoor (Condenser) Fan Contactor
TB
—
Terminal Block
Terminal Block Connection
Field Wiring
Factory Wiring
Splice Connection
(Factory-Supplied)
50HJ008-012, 208/230-3-60
50HJ008-014, 460-3-60
50HJ014, 208/230-3-60
Fig. 8 — Power Wiring Connections
50HJ008-014, 575-3-60