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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
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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
    Join Date
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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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