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126
15.8: Heater Operation
The heater controls return air to circulate into the upper compartment to
maintain desired set point temperature.
A call for cooling in the upper (warmer) compartment opens both damper doors
and disables the heater.
A call for heat in the upper (warmer) compartment closes both damper doors
and enables the heater.
The heater is disabled when the ambient thermistor senses a temperature
excessive to 85°F.
o This prevents excessive compartment temperatures.
To access the heater (upper compartment) remove the 5 screws securing the rear panel cover.
Once this is done, remove the metal wire cover to access the fan connector. Once disconnected
the rear panel can now be removed from the compartment.
Upper Compartment Heater: Used to control and
maintain the temperature of the upper zone.
A replacement heater will appear as
seen to the left. The heater will come
attached to a replacement bracket.
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