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  1. #1

    Honeywell IAQ duel fuel settings

    What is the reason to use option 2 (Droop Control with Aux Heat lockout) when setting up duel fuel on IAQ. I usually have set them up with option 1

    Heat Pump Control — Fossil Fuel Backup (Setup Function 0345):
    Option 0 (No Droop Control): If outdoor temperature is above balance point (Function 0350), only the compressor operates. Below this temperature, only backup heat operates.

    Option 1 (Droop Control): As above, but backup heat is activated if room temperature drops to the selected droop temperature setting (compressor is deactivated).

    Option 2: (Droop Control with Aux Heat lockout): Compressor works only above auxiliary lockout temperature, backup heat works only below balance point, 2° droop between temperatures.

    345 Dual fuel heat
    pump control
    1 Droop Control **
    0 No Droop Control **
    2 Droop Control with Aux Heat Lockout

  2. #2
    Join Date
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    Option 1.

    If the balance point is set to 35°. The furnace can run to recover from a set back even if the outdoor temp is 55°.

    Option 2.

    If the balance point is 35, and the aux lock out is set to 50, the furnace can't come on for recovery, if the outdoor temp is 55°.

    Option 2 saves more on gas.
    Last edited by beenthere; 05-07-2010 at 03:42 PM.
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  3. #3
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    Quote Originally Posted by beenthere View Post
    Option 1.

    If the balance point is set to 35°. The furnace can run to recover from a set back even if the outdoor temp is 45°.

    Option 2.

    If the balance point is 35, and the aux lock out is set to 50, the furnace can't come on for recovery, if the outdoor temp is 45°.

    Option 2 saves more on gas.
    Then how is option 2 different from option 0?

  4. #4
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    Ooops.

    That was suppose to be 55, not 45, or there wouldn't be any real difference.

    I corrected it in my post.
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  5. #5
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    Thanks, BT thats how I thought it worked but it is a little confusing how they write it in the book and after I saw your post I started second guessing myself.

  6. #6
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    Yea, they could use better tech writers.

    And I should proof read before I post.
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  7. #7
    That is a nice clear answer BEENTHERE, thanks. If only the would put that in the book.

  8. #8
    Join Date
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    Quote Originally Posted by beenthere View Post
    Yea, they could use better tech writers.And I should proof read before I post.
    Amen. They have engineers write the tech manuals and they think on a different level than most of us normal heating and A/C professionals. Everything is very analytical to them. (Note: The owner of the company I work for is an engineer and I have been working with him for 16 years and deal with it everyday.) I think this difference causes some confussion at times for installers and techs.

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