
CACH/CAHH/CAHJ & CACH/CAHH/CAHK
Air Handlers
• Installation, Operation and Maintenance Manual •
P/N 240008108, Rev. G [07/08/10]
45
Set DIP switch #4 to ON
For Wall Th
ermostat Operation the control
must be confi gured through the DIP switches
located on the control board located in the
control box.
Set DIP switch #4 to YES (see
1. Table
6,
Page 32 ).
In wall thermostat mode, the control will
2.
not accept commands from the infrared
remote control.
The filter check timer will default to
3.
1000 Hrs.
Fan Operation
Th
e cassett e unit utilizes a two-speed motor.
In wall thermostat operation, fan speed se-
lection can be made through the DIP switch
sett ings located on the main control board
(Figure 33, Page 31).
With DIP switch #3 set to HIGH, the fan
1.
speed will be set to High.
With DIP switch #3 set to LOW, the fan
2.
speed is set to Low.
See
3.
Table 6, Page 32 for other available
DIP switch selections.
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”
1.
to “G” the fan will energize.
Aft er the thermostat has been satisfi ed and
2.
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 remain-
ing energy from the unit.
Some thermostats are equipped with an
AUTO/ON fan switch. When this switch is
placed in the ON position, the fan will run
continuous. When the switch is in the AUTO
position, the fan will cycle with the call for
heating or cooling.
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
1.
unit, place the system switch in Cooling
mode.
Adjust the setpoint temperature below the
2.
room temperature.
Th
e compressor and fan motors will start
3.
and cooling will begin.
Next, place the setpoint temperature
4.
above the room temperature. Th
e outdoor
condenser will stop.
Th
e fan will operate as described in “Fan
5.
Operation.” pg. 39
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).
Reversing Valve
EMI outdoor heat pump units utilize a
reversing valve that is energized in Cooling
mode. Make sure that the thermostat selected
will energize the reversing valve in Cooling
mode.
CACH/CAHH/CAHK Wall Thermostat Operation