Is the Aprilaire model 8466 thermostat Dual Fuel capatable, if so how do you set it up ?

Friday, November 11, 2011 by Aprilaire Team
Consumer question:

Is the 8466 Dual Fuel capatable, if so how do you set it up ?


Aprilaires' response:

Thank you for contacting us with regards to your model 8466 Thermostats. There are two requirements for dual fuel mode. The thermostat must be in heat pump mode (set by the switch on the back), and the auxiliary heat must be set to Gas or Oil. Under these conditions, whenever the thermostat stages from compressor to auxiliary, the thermostat will lock out the compressor.

This thermostat can also act as a fossil fuel kit. When the outdoor temperature sensor is installed and enabled, the thermostat enables settings for high and low balance points. The high balance point will lock out the auxiliary heat when the outdoor temperature rises above that level. The low balance point locks out the compressor when the outdoor temperature falls below that level. In-between, the thermostat will stage based on demand. Please see your installation instructions for more information.

We appreciate the opportunity to be of assistance.

Comments for Is the Aprilaire model 8466 thermostat Dual Fuel capatable, if so how do you set it up ?

Tuesday, January 22, 2013 by Ron Johnson:
I am currently looking at the Aprilaire 8620. Is this unit compatable with a heat pump and a gas furnace. My furnace will be a Ducane 95%, two stage, variable speed. heat pump will be 14 SEER single stage. Thanks for the info.
Sunday, January 19, 2014 by Jack Godfrey:
What do recommend the high and low balance points to be set at in Atlanta Georgia with using a duel fuel 8466 stat on heat pump with gas as aux. Heat?

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