CACG/CAHG & CACH/CAHH
Air Handlers
• Installation, Operation and Maintenance Manual •
P/N 240008108, Rev. B [082509]
23
Electrical Wiring
(continued)
Wiring diagram location
Figure 29
Wiring diagram (on inside
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 23).
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 22).
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.
The 24V control transformer is located in
1.
the evaporator. This provides low-voltage
control power to both the evaporator and
condenser. Depending on the models
selected, the low-voltage interconnect
control wiring may be different.
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 five 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 23).
