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  Aprilaire Thermostats: Frequently Asked Questions
Supporting Information
  • Aprilaire Thermostats

  • Aprilaire Frequently Asked Questions:

    General Thermostat Questions
    Aprilaire 8500 Series Questions
    General Thermostat Questions and Answers

    1. Where should my thermostat be located?
    To assure accurate temperature control, the thermostat should be mounted on an inside wall in a frequently occupied space that best represents the building’s temperature. The thermostat should be mounted at least 18” from any outside wall and approximately 5’ above the floor. DO NOT place the thermostat:
    • Behind doors, in corners or other dead air spaces
    • In direct sunlight or near lamps, appliances or other sources of heat
    • On an outside wall or a wall exposed to an unconditioned space (e.g., garage, etc.)
    • In the flow path of a supply register, in stairways or near outside doors
    • On a wall where concealed pipes and/or ductwork will affect the thermostat
    • Near sources of electrical interference such as arcing relay contacts
    2. What is the Auto Mode and why would I use it?
    The Auto Mode will allow the thermostat to cycle heating or cooling equipment as the building temperature moves outside the comfort zone that you have entered as heat and cool set points in your thermostat. Use this position for optimum comfort and control.

    3. When should I use emergency heat? (Heat pumps only)
    Emergency heat should be used when there is a problem with your heat pump compressor or when the heat pump is not maintaining your comfort level.

    4. Why does “- -“ appear when I press the outdoor button?
    There is no outdoor temperature sensor attached to the thermostat.

    5. Why does the clock flash 12:00?
    The thermostat has lost power and the clock needs to be reset.


    Aprilaire 8500 Series Questions

    1. How do I change the temperature temporarily?
    On the Aprilaire 8500 Series Thermostats, adjust up or down buttons to the desired temperature. The thermostat will maintain that set point for three hours. For indefinite override, press “hold” and adjust the thermostat to the desired temperature. The thermostat will maintain that set point until the resume button is pressed.

    2. Why is the flame or snowflake flickering on the Aprilaire 8500 Series Thermostat?
    The flickering flame or snowflake indicates that the thermostat is actively making a call for heat (flame) or air cooling (snowflake).

    3. Why does the display show AC?
    The thermostat has lost power from the heating or air conditioning equipment. This may occur during a power outage or during service to your HVAC Equipment.

    4. How do I change the thermostat to read F? or C?
    On an Aprilaire 8500 Series Thermostat, press the “ź” and “/” buttons simultaneously.

    5. Between heating and cooling season, I want to turn my system off. Will this change the program?
    If you want to turn your system off, press the mode button on your 8500 Series Thermostat until “OFF” appears.

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