CACG/CAHG & CACH/CAHH
Air Handlers
• Installation, Operation and Maintenance Manual •
P/N 240008108, Rev. B [082509]
27
Remote Thermostat Operation
(optional for CACH/CAHH)
(continued)
Electric heat operation
For remote thermostat operation with electric
heat the control must be configured properly
(Remote Thermostat ON) [Table 6, pg. 32],
Heat Source ON [Figure 36, pg. 35].
The remote thermostat will control the call for
electric heat operation (On or Off) through
the low-voltage terminals, R and W.
After connecting the thermostat to unit, place
the system switch in Heat mode.
Adjust the set-point temperature above
•
the room temperature.
The electric heat will energize along with
•
the indoor fan motor.
Heating will continue as long as the set-
•
point remains above room temperature.
Next, place the set-point temperature below
room temperature.
The Electric heater will switch off and the
•
indoor fan will remain on for an additional
sixty seconds.
NOTICE
Once heating has cycled off or following
a power outage, heating will not start
for at least three minutes (short-cycle
protection).
Optional
HEAT PUMP WITH
ELECTRIC HEAT
(Two-stage heating)
For remote thermostat operation for two-
stage heating including a heat pump con-
denser and indoor electric heat, the control
must first be configured properly (Remote
Thermostat ON) [Table 6, pg. 32], Heat
Source ON [Figure 36, pg. 35]
The remote thermostat will control the call for
electric heat operation (on or off) through the
low-voltage terminals, R and W, and compres-
sor (heat pump) heating through terminals
R and Y.
After connecting the two-stage heating ther-
mostat to the unit, place the system switch in
Heat mode.
Adjust the set-point temperature above
•
the room temperature. The compressor
and fan motors will start and heating
will begin.
Depending on the thermostat selected,
•
electric heat will also energize when the
deviation between room temperature
and set point temperature is high enough
to call for second stage heating. (See
the thermostat owner’s manual for this
feature.)
Place the set-point temperature below the
room temperature.
The outdoor condenser and electric heat
•
will stop while the indoor fan will remain
on for an additional sixty seconds.
NOTICE
Once heating has cycled off or following
a power outage, heating will not start
for at least three minutes (short-cycle
protection).
