Step 5 - Make Electrical Connections; Field Power Supply - Carrier 50HJQ004-007 Installation, Start-Up And Service Instructions Manual

Step 5 — Make Electrical Connections
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 /NFPA (American National Standards Insti-
tute/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.
FIELD POWER SUPPLY — All units except 208/230-v
units are factory wired for the voltage shown on the nameplate.
If the 208/230-v unit is to be connected to a 208-v power sup-
ply, the transformer must be rewired by disconnecting the
1
black wire from the 230-v /
transformer and connecting it to the 208-v
terminal from the transformer.
Refer to unit label diagram for additional information. Pig-
tails are provided for field wire connections. Use factory-
supplied splices or UL (Underwriters' Laboratories) approved
copper/aluminum connector.
208/230-1-60
208/230-3-60
(SIZES 004 AND 005)
LEGEND
C — Contactor
COMP — Compressor
IFC — Indoor Fan Contactor
NEC — National Electrical Code
-in. male spade terminal on the
4
1
/ -in. male spade
4
Fig. 6 — Power Wiring Connections
When installing units, provide a disconnect per the NEC.
All field wiring must comply with the NEC and local
requirements.
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. 6.
3. For units with electric heat, refer to Accessory Electric
Heat Installation Instructions.
During operation, voltage to compressor terminals must be
within range indicated on unit nameplate (also see Tables 2A-
2D). On 3-phase units, voltages between phases must be bal-
anced within 2% and the current within 10%. Use the formula
shown in Tables 2A-2D, Note 2, on page 10 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 operation
invalidates any applicable Carrier warranty.
NOTE: If accessory thru-the-bottom connections and roof
curbs are used, refer to the thru-the-bottom accessory installa-
tion instructions for information on wiring the unit.
208/230-3-60
460-3-60
(SIZE AND 007 ONLY)
460-3-60
(SIZES 004 AND 005)
5