CACG/CAHG/CAHJ & CACH/CAHH/CAHK
Air Handlers
• Installation, Operation and Maintenance Manual •
Comfort where it counts
46
P/N 240008108, Rev. G [07/08/10]
Electric heat operation
Th
e wall thermostat will control the call for
electric heat operation (on or off ) through the
low-voltage terminals “R” and “W”.
Aft er connecting the thermostat to the
1.
unit, place the system switch in Heating
mode.
Adjust the setpoint temperature above the
2.
room temperature.
Th
e electric heat will energize along with
3.
the indoor fan motor.
Heating will continue as long as the set-
4.
point remains above room temperature.
Place the set-point temperature below
5.
room temperature.
Th
e electric heater will switch off and the
6.
indoor fan will remain on for an additional
sixty seconds.
NOTICE
Once the cooling has cycled off or fol-
lowing a power outage, the compressor
will not restart for at least three minutes
(anti-short-cycle timer).
Optional Heat pump with Electric
heat (Two-stage heating)
Th
e wall thermostat will control the call for
electric heat operation (on or off ) through
the low-voltage terminals “R” and “W” and
for compressor (heat pump) heating through
terminals “R” and “Y”.
Aft er connecting the two (2) stage heating
7.
thermostat to the unit, place the system
switch in Heating mode.
Adjust the setpoint temperature above the
8.
room temperature.
Th
e compressor and fan motors will start
9.
and heating will begin.
Depending on the thermostat selected,
10.
electric heat will also energize when the
deviation between room temperature
and setpoint temperature is high enough
to call for second stage heating. (See
the thermostat owner’s manual for this
feature).
Place the setpoint temperature below the
11.
room temperature.
Th
e outdoor Heat Pump unit and electric
12.
heat will stop while the indoor fan will re-
main on for an additional sixty seconds.
Clean Filter Alarm (Wall
Thermostat mode)
To aid in fi lter maintenance, the cassett e con-
troller will indicate when a scheduled fi lter
cleaning is required by fl ashing the Timer/
Alarm LED.
During normal operation, the microprocessor
will keep track of the unit’s run time.
When the clean fi lter time has elapsed,
•
the Timer/Alarm LED will flash four
times to indicate that the fi lter needs to
be cleaned.
For wall thermostat operation, the default
•
clean fi lter time is 1000 hours.
Also, if a coil freeze condition is detected
•
four times within a 24-hour period, the
Clean Filter Alarm will appear on the
cassett e display.
Aft er fi lter maintenance has been performed,
press the Clear Filter Warning Butt on for three
seconds. Th
e control will respond with a beep
to indicate that the timer has been reset.
CACH/CAHH/CAHK Wall Thermostat Operation
(continued)