CACH/CAHH/CAHJ & CACH/CAHH/CAHK
Air Handlers
• Installation, Operation and Maintenance Manual •
P/N 240008108, Rev. G [07/08/10]
21
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
Low-voltage
connections
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.
Th
e 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.
Th
e 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. Th
en slide the cover up and off
( Figure 27, Page 21 ).
The rating plate is located on the out-
2.
side of control box cover ( Figure 27,
Page 21 ).
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.