CACG/CAHG/CAHJ & CACH/CAHH/CAHK
Air Handlers
• Installation, Operation and Maintenance Manual •
Comfort where it counts
22
P/N 240008108, Rev. G [07/08/10]
Electrical Wiring
(continued)
Wiring diagram location
Figure 29
Wiring diagram (on inside
Wiring diagram (on inside
of control panel cover)
of control panel cover)
It is also recommended that a local discon-
4.
nect switch be connected within 3 feet of
the unit. In some areas this may be a code
requirement.
High-voltage electrical wiring
Inspect the existing wiring for any de-
1.
ficiencies such as cut or frayed wires.
Replace if any such wiring if found.
Refer to the wiring diagram (
2.
Figure
29,
Page 22 ).
Route the cable through the appropriate
3.
hole in the control box for the high-volt-
age electrical wiring. Connect the power
wire to L1 and the neutral wire to L2 at
the power connector location. ( Figure 28,
Page 21 ).
Connect the ground wire to the ground
4.
lug or lead at the same location in the
control box.
WARNING
Terminate ALL unused wires with a wire
nut or crimp connector.
Low-voltage electrical wiring
NOTICE
All low-voltage interconnect wiring must
be at least 18 AWG.
Th
e 24V control transformer is located in
1.
the air handler. Th
is provides low-voltage
control power to both the air handler and
condenser. Depending on the models
selected, the low-voltage interconnect
control wiring may be diff erent.
Refer to the wiring diagram to connect
2.
the low-voltage wiring to the appropriate
terminals.
Once the connections are made, replace
3.
control box cover with the wiring dia-
gram facing in and secure with the four
screws.
Depending on the thermostat required or
4.
selected, cooling-only air handlers may
utilize three to fi ve low-voltage intercon-
necting wires between the indoor unit,
thermostat and the outdoor unit. Some
thermostats do not require the use of the
“C” (brown) connection. For these ap-
plications, ensure that any unused wires
are insulated to prevent them from making
contact with the junction box or other
metal surfaces.
If the indoor unit has electric heat, then a
5.
“W” connection is required between the
thermostat and the indoor unit.
NOTICE
On units rated 208/230V, the primary
side of the transformer is factory wired
for 230V. For a 208V power supply, the
transformer tap must be changed from
orange to red. Refer to the wiring dia-
gram located on the inside of the control
box cover ( Figure 29, Page 22 ).