CACG/CAHG & CACH/CAHH
Air Handlers
• Installation, Operation and Maintenance Manual •
Comfort where it counts
22
P/N 240008108, Rev. B [082509]
Electrical Wiring
Removing control box cover
Figure 27
rating plate
Electrical connections
Figure 28
l2
high-voltage cable
l1
Ground lug
Ground wire
low-voltage
connections
NOTICE
All electrical wiring must be run accord-
ing to NEC and local codes.
General requirements
WARNING
Electrical shock hazard
— Make sure the
power is off before proceeding.
The standard unit voltage is 208/230V
1.
(60Hz, 1Ph). Check the unit’s rating plate
for your model’s electrical requirements.
The wires should be capable of carry-
2.
ing the maximum load current under
non-fault conditions at the stipulated
voltages.
Avoid large voltage drops on cable runs,
3.
particularly in low-voltage wiring.
The correct cable size must be used to
4.
ensure a voltage drop of less than 1 volt
in the control wiring.
Once the refrigeration pipe work is
5.
complete, the electrical supply can be
connected.
Low-voltage wiring must be at least
6.
18 awg.
Connect wiring
To access high-voltage wiring, loosen the
1.
four screws on the front of the control
box cover. Then slide the cover up and off
(Figure 27, Page 22).
The rating plate is located on the out-
2.
side of control box cover (Figure 27,
Page 22).
Each unit must have a separate branch
3.
circuit protected by a fuse or breaker.
Check the rating plate for circuit ampacity
and breaker or fuse size. Use only HACR
type breakers. Select the proper wire for
the ampacity rating.
