CACG/CAHG/CAHJ & CACH/CAHH/CAHK
Air Handlers
• Installation, Operation and Maintenance Manual •
Comfort where it counts
42
P/N 240008108, Rev. G [07/08/10]
At that time the electric heat will switch
11.
off and the heat pump (compressor) will
take over the heating demand.
Th
e electric heater will not restart until a
12.
three-minute delay has elapsed.
Once the room temperature is satisfi ed
13.
and the two-minute minimum run time
has elapsed, the compressor will cycle
off .
Th
e compressor will not restart until a
14.
three-minute delay has elapsed.
Th
e fan will operate as described in “Fan
15.
Operation.” see pg. 39
Dry mode
Dry mode will remove humidity from the air
while maintaining a specifi c setpoint tempera-
ture. Th
is is done by cycling Cooling mode.
Dry mode will NOT maintain a specifi c hu-
midity level. Th
e fan will remain on constantly
at low speed while in Dry mode.
For Dry mode operation, fi rst turn the unit on
via the POWER/SEND butt on.
Select Dry mode via the MODE butt on.
1.
Th
e room temperature and setpoint tem-
2.
perature will be displayed.
Press either the UP or DOWN ARROW
3.
butt ons to change the setpoint tempera-
ture.
Th
e setpoint temperature will change by
4.
one degree with each successive press
of the UP or DOWN ARROW butt ons.
Holding the butt on down will change the
temperature rapidly.
Place the setpoint temperature at a desired
5.
room temperature.
Depending on the difference between
6.
room temperature and setpoint tempera-
ture, the compressor will either remain on
constantly, cycle on/off , or remain off .
If the room temperature is greater than
7.
the setpoint temperature by more than
two degrees, the unit will run Cooling
mode constantly.
If the room temperature is within ± two
8.
degrees of setpoint, the unit will cycle
cooling on seven minutes and off seven
minutes to remove humidity from the air
while not over cooling the room.
If the room temperature is less than the
9.
setpoint temperature by more than two
degrees, cooling will remain off .
Auto Changeover mode
For Auto Changeover mode (ACO), the unit
must have a heat source. Th
e control must fi rst
be confi gured properly (Heat source – ON).
(Table 6, pg 32).
In Auto Changeover mode, the cassett e will
operate in either Cooling mode or Heating
mode. Th
e control will select the mode of
operation depending on the setpoint tempera-
ture, room temperature and the diff erential
sett ing selected in the Confi guration mode.
For Auto Changeover mode, fi rst turn the unit
on via the POWER/SEND butt on.
Select Auto mode via the MODE but-
1.
ton.
Th
e room temperature and setpoint tem-
2.
perature will be displayed.
Press either the UP or DOWN ARROW
3.
butt ons to change the setpoint tempera-
ture.
Th
e setpoint temperature will change by
4.
one degree with each successive press
of the UP or DOWN ARROW butt ons.
Holding the butt on down will change the
temperature rapidly.
Place the setpoint temperature below the
5.
room temperature by the auto change
over diff erential amount selected in the
Confi guration mode.
Th
e compressor will start and the unit will
6.
run cooling operation as described under
Cooling mode.
If the setpoint temperature is above the
7.
room temperature by the auto change
over diff erential amount selected in the
CACH/CAHH/CAHK Microprocessor Controller Operation
(continued)