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LIMITINGTEMPERATURE RANGE
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The adjustment limiting screws under the temperature control
knob can be relocated to change the maximum heat and cool set
points.
1. Remove the front cover.
2. Turn the temperature control knob to the midpoint of the dial.
3. Remove the 4 screws holding the control panel. Lift up the
control panel.
4. Remove temperature control knob.
5. Locate the 2 adjustment limiting screws in the thermostat
mounting panel.
NOTES:
!. Control panel
2. Adjustment limiting screws
3. Fan control
4. Temperature control
5. Thermostat mounting panel
• These screws are factory installed for a maximum
temperature set point range of 60 ° to 90°F (16° to 32°C).
• Each hole in the plate represents approximately a 4°F
(2°C) change from the adjacent hole.
6. To adjust the temperature range, move the adjustment
limiting screws to the desired location.
7. Replace the knob when the desired range has been set.
8. Replace the control panel using the 4 screws removed earlier.
9. Replace the front cover.
HEAT PUIVIPCHANGEOVER AND EMERGENCY HEAT
CONTROL ADJUSTIVIENT
Heat pump equipped models use backup electric resistance
heating coils. At extremely low, outdoor ambient temperatures,
the heat pump is automatically disabled and the PTHP operates
solely on electric resistance heat.
Heat Control Adjustment
The heating control is located behind the front cover on the right
side panel of the chassis. Its function is to allow you to set the
outdoor temperature range in which the heat pump operates.
This control switches the unit heating supply mode between the
heat pump and electric resistance heat based on the outdoor
ambient temperature. These changeover temperatures are based
on the settings of the control. The factory setting is at the one
o'clock position.
To adjust the heat control:
Insert a flat-blade screwdriver into the slot as shown.
1. To increase the changeover set point, turn
counterclockwise.
2. To decrease the changeover set point, turn clockwise.
Emergency Heat Only
In the event of a compressor malfunction in the heat pump mode,
turn the screw to the extreme counterclockwise emergency heat
position. Heating will be supplied using electric resistance heat
only.
NOTE: In the emergency heat position, the compressor is
disconnected for both heat pump and cooling operations.
Service is required to restore full function of the PTHR Return the
control to its original position after repairs have been made.
1. Heat control slot
22
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