8
DIGITAL CONTROL OPERATION
Temperature Display
The Friedrich digital PTAC is shipped from the factory to
display the desired room temperature on the LED readout.
The unit can be confi gured to display the room temperature
by simultaneously pressing the ‘Cool’ and ‘High Fan’ buttons
for three seconds the display will show an ‘R’ for one seconds
to acknowledge the change. The unit will display the setpoint
whenever the ‘Temp’
or buttons are pressed and then
switch back to room temperature.
To revert back to displaying the setpoint only press the ‘Cool’
and ‘Low Fan’ buttons for three seconds simultaneously, the
unit will display an ‘S’ for one seconds to acknowledge the
change.
ºF vs. ºC Display
The unit is factory confi gured to display all temperatures in
degrees Fahrenheit (
º
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
º
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 page 16 for fan cycle
control.
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 effi ciently 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 5
controls the fan mode, see page 16 for setting.
When the outdoor coil temperature falls below 30°F for more
than 2 minutes 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 5 controls the fan mode, see page 16 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
7 controls the emergency heat setting, see page 16.
Fan Mode
Fan Only
Pressing the ‘Fan Only’ button will run the fan to allow for
air circulation in the room without operating the compressor
or heater regardless of the room or set temperature. The fan
speed selection is made by pressing either the ‘High Fan’ or
‘Low Fan’ button.
Cycle/Continuous
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 fan cycle mode) Fan continuous mode is used
to keep constant airfl ow circulation in the room during all
times the unit is ‘ON’. Fan cycle will conserve energy by
only operating the fan while the compressor or electric
heater is operating. Dip switch 5 controls the fan mode,
see page 16 for setting.
Digital Control Panel
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