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920-087-04 (8-05)
DigitalControlUserInputConfiguration
The adjustable control dipswitches are located at the lower left hand portion of the digital Smart Center. The inputs are only visible
and accessible with the front cover removed from the PTAC.
Dip Switch Setting
1) Electronic Temperature Limiting - Switches 1-4
The digital control is set from the factory to allow a tempera-
ture range between 60°F and 90°F in both heating and cooling
mode. Dip Switches 1-4can be used to set high and low limits
for either heating or cooling or both.
From the factory all four switches are in the up 'ON' position.
The charts to the right show the available electronic limiting
ranges.
Heating RangeSwitches 1 & 2
Temperature
Range
Low High
60 90
60 87
60 84
60 81
Dip
Switch
1 2
On On
Off On
Off Off
On Off
2) Fan Cycle Control - Switch 5
All PTACs are shipped from the factory with Dip Switch 5 in the
'OFF' position to cycle thefan only when there is a demand for
the compressor or heater. As an option the fan may be set to
'continuous' mode by switching Dip Switch 5 to 'ON' positionto
run the fan continuously while the unit is powered on.
Toensure that the room temperature is maintained evenlywhile
in fan cycle mode the Even Temp Load Anticipation feature is
enabled. Quiet Fan Belay isalso enabled in fan cycle mode to
lessen the acoustical change between compressor start up and
shut off by running the fan for 5 seconds before each demand
cycle, and 30 seconds after cooling or 15 seconds after heating
cycles.
3) Room Freeze Protection - Switch 6
Unitsare shippedfrom thefactorywith the roomfreeze protection
disabled. Room Freeze Protection can be switched on at the
owner's preference by moving Dip Switch 6 to 'ON'. This feature
will monitor the indoor room conditions and inthe event that the
room falls below 40°F the unit will cycle on high fan with the
electric heater. This occurs regardless of mode.
4) Emergency Heat Override - Switch 7
In the unlikely event of a compressor failure a heat pump unit
may be switched to operate in only the electric heat mode until
repairs can be made. Moving Dip Switch 7 to 'ON'.
Note: PTAC must be disconnected from power supply
when making any configuration changes.
CoolingRange Switches 3 & 4
Ternperatu re
Range
Low High
60 90
63 90
66 90
69 90
Dip
Switch
3 4
On On
On Off
Off Off
Off On
Figure11
Factory DipSwitch Configuration
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16
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