
CACG/CAHG/CAHJ & CACH/CAHH/CAHK
Air Handlers
• Installation, Operation and Maintenance Manual •
Comfort where it counts
24
P/N 240008108, Rev. G [07/08/10]
Wall Thermostat Operation
(optional for CACH/CAHH/CAHK)
(continued)
FAN operation
Th
e wall thermostat will control the call for
fan operation (on or off ) through the low-
voltage terminals “R” and “G”. When the
wall thermostat connects “R” to “G” the fan
will energize. Aft er the thermostat has been
satisfi ed and the call for heating or cooling
has been removed, the indoor fan will remain
on for an additional sixty (60) seconds. Th
is
increases effi
ciency by pulling the remaining
energy from the unit.
Some thermostats are equipped with an
AUTO/ON fan switch. When this switch
is placed in the ON position the indoor fan
will run continuous. When the switch is in
the AUTO position the indoor fan will cycle
with the call for heating or cooling.
CACH/CAHH/CAHK units only — Th
e
indoor unit utilizes a two speed motor. For
wall Th
ermostat Operation, fan speed selec-
tion can be made through the DIP switch
sett ings located on the main control board. By
sett ing DIP switch #3 Remote Th
ermostat Fan
Speed Selection to ON, the fan speed will be
set to High. Switching to OFF, the fan speed
is set to Low.
COOLING operation
Th
e wall thermostat will control the call for
cooling operation (on or off ) through the
low-voltage terminals, R and Y.
Aft er connecting the thermostat to the unit,
place the system switch in Cool mode.
Adjust the set-point temperature below
•
the room temperature.
Th
e compressor and fan motors will start
•
and cooling will begin.
Next, place the set-point temperature above
the room temperature.
Th
e outdoor condenser will stop.
•
Th
e fan will operate as described in FAN
•
operation.
NOTICE
Once cooling has cycled off or following
a power outage, the compressor will not
start for at least three minutes (short-
cycle protection).