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Installer Guide
Auxiliary Heat Lockout
(setup steps 58 - 59)
This feature allows the auxiliary heat for a heat pump (W2 and W3) to be locked out above
a specific outdoor temperature. These steps will only appear if the thermostat jumper J1 is
set for Heat Pump and J3 is set for Electric Heat. A local outdoor sensor must be used for
this feature to work.
Lockout Aux Heat With Outdoor Temp
(Setup Step 58) - When set to ON, the Aux Heat
Lockout feature is enabled. When set to OFF, Auxiliary Heat will stage normally.
Aux Heat Lockout Temp
(Setup Step 59) - (20˚ - 75˚ ) This step allows the user to set the
temperature at which Auxiliary Heat will be locked out. Adjustable from 20 to 75 degrees
Fahrenheit. NOTE: This temperature setting cannot be lower than 5 degrees above the
Heat Pump Lockout temperature.
This feature is for heat pump applications only. Steps 56 - 59 will only appear if the
thermostat jumper is set J1 for Heat Pump and J3 is set for Gas Heat.
Dual Fuel On, Off,
(Setup Step 60) -
On
- Tells the thermostat an outdoor temperature or
a demand for third stage heat will be used to stop running the heat pump and only run a
fossil fuel source of heat.
NOTE
: Once the change to fossil fuel is made, the heat demand
must finish with fossil fuel. Additional heat demands within 10 minutes will also use fossil
fuel, regardless of outdoor temperature.
Setup steps 61-63 will only appear if step 60 is set to ON.
Dual Fuel Changeover on Outdoor Temp
(setup step 61) -
ON
: the change from Heat
Pump to a fossil fuel source of heat will be based on outdoor temperature. (a local outdoor
sensor is required for ‘ON’)
OFF:
Heat Pump heating will be terminated when there is a demand for third stage heat
and a switch to fossil fuel will be made.
Dual Fuel Balance Point
(setup step 62) - (0˚ - 60˚ ) Specifies the outdoor temperature at
which the heat pump will cease operating and a fossil fuel source of heat is used.
Dual Fuel Changeover Delay
(setup step 63) - (0 - 90) Specifies the number of seconds
the heat pump is allowed to continue running after a fossil fuel heat source has been
engaged.
Deadband Settings (Setup Steps 32-41, 77)
The Deadband is the number of degrees or minutes that the thermostat waits
before it initiates each stage of heating or cooling.
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PSP4273_Installer man.indd 14
6/9/21 11:23 AM
6/9/21 11:23 AM
