CACG/CAHG & CACH/CAHH
Air Handlers
• Installation, Operation and Maintenance Manual •
Comfort where it counts
42
P/N 240008108, Rev. B [082509]
At that time the electric heat will switch
11.
off and the heat pump (compressor) will
take over the heating demand.
The electric heater will not restart until a
12.
three-minute delay has elapsed.
Once the room temperature is satisfied
13.
and the two-minute minimum run time
has elapsed, the compressor will cycle
off.
The compressor will not restart until a
14.
three-minute delay has elapsed.
The 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 specific setpoint tempera-
ture. This is done by cycling Cooling mode.
Dry mode will NOT maintain a specific hu-
midity level. The fan will remain on constantly
at low speed while in Dry mode.
For Dry mode operation, first turn the unit on
via the POWER/SEND button.
Select Dry mode via the MODE button.
1.
The room temperature and setpoint tem-
2.
perature will be displayed.
Press either the UP or DOWN ARROW
3.
buttons to change the setpoint tempera-
ture.
The setpoint temperature will change by
4.
one degree with each successive press
of the UP or DOWN ARROW buttons.
Holding the button 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. The control must first
be configured properly (Heat source – ON).
(Table 6, pg 32).
In Auto Changeover mode, the cassette will
operate in either Cooling mode or Heating
mode. The control will select the mode of
operation depending on the setpoint tempera-
ture, room temperature and the differential
setting selected in the Configuration mode.
For Auto Changeover mode, first turn the unit
on via the POWER/SEND button.
Select Auto mode via the MODE but-
1.
ton.
The room temperature and setpoint tem-
2.
perature will be displayed.
Press either the UP or DOWN ARROW
3.
buttons to change the setpoint tempera-
ture.
The setpoint temperature will change by
4.
one degree with each successive press
of the UP or DOWN ARROW buttons.
Holding the button down will change the
temperature rapidly.
Place the setpoint temperature below the
5.
room temperature by the auto change
over differential amount selected in the
Configuration mode.
The 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 differential amount selected in the
CACH/CAHH Microprocessor Controller Operation
(continued)
