Installation and Operation Manual
24
°F vs. °C Display
The unit is factory congured to display all temperatures in degrees
Fahrenheit (° F). To switch to degrees Celsius press the ‘Fan Only’ and
‘Low Fan’ buttons simultaneously for three seconds. The display will show
a ‘C’ as acknowledgement of the change. To revert back to ° F press the
‘Fan Only’ and ‘Low Fan’ buttons simultaneously for three seconds. The
display will show an ‘F’ as acknowledgement of the change.
Cooling Mode
Pressing the ‘Cool’ button while the unit is in any mode, including off,
will put the unit into cooling mode. Adjust the temperature readout to the
desired room temperature and the unit will cycle the compressor on and
off to maintain a comfortable room. The compressor will come on anytime
that the room temperature is 1.8° F above the desired temperature. The
fan operation is dependent on the fan mode selected, either continuous
or cycling. See Constant Fan Mode.
Heating Mode
Pressing the ‘Heat’ button while the unit is in any mode, including off, will
put the unit into heating mode.
Heat Pump Models (PDH)
When the ‘Heat’ button is pressed initially the unit will energize the electric
resistance heat to quickly bring the room to the set temperature. When the
desired room temperature falls 1.8° F below the desired set temperature the
unit will cycle the compressor on and operate as a heat pump to maintain
the room temperature while running more efciently than resistance heat
only models. If the room temperature should fall more than 5° F from the
set temperature the unit will run the resistance heater. The fan operation
is dependent on the fan mode selected, either continuous or cycling. Dip
switch 3 controls the fan mode, see page 23 for setting.
When the outdoor coil temperature falls below 30° F for more than 2 min-
utes the unit will operate the resistance heaters and not the compressor.
When the outdoor coil temperature reaches 45° F the compressor will be
allowed to operate again.
Heat/Cool Models (PDE)
After pressing the ‘Heat’ button, adjust the temperature readout to the
desired room temperature and the unit will cycle the resistance heat on
and off to maintain a comfortable room. The heater will come on anytime
that the room temperature is 1.8° F below the desired temperature. The
fan operation is dependent on the fan mode selected, either continuous
or cycling. Dip switch 3 controls the fan mode, see page 23 for setting.
Emergency Heat Operation
In the event of a compressor failure in heat pump mode the compressor may
be locked out to provide heat through the resistance heater. This feature
ensures that even in the unlikely event of a compressor failure the room
temperature can be maintained until the compressor can be serviced. Dip
switch 1 controls the emergency heat setting, see page 23.
Constant Fan Mode
Pressing the Constant fan mode button will provide constant fan operation
in cooling or heating modes. The fan speed selection is made by pressing
either "High" or "Low" fan speed button.
Cycle/Continuous (Factory Default)
The owner may choose between fan cycling or fan continuous mode
based on property preference (Note: Even heat monitoring and quiet
start/stop fan delay only operate in heat mode + cycle mode). Cycle fan
will conserve energy by only operating the fan when the call for cooling
or heating is required.
Digital Control Operation
Figure 32
Digital Control Panel