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  1. #1

    Honeywell T-Stat settings for Em heat and Droop Problem

    Issue:
    1) When temp differential is beyond droop point the gas furnace does not kick in.
    2) When 220 breaker for Heatpump is dissconnected (as it will be when generator is running Durring a power outage) the EM Heat does not kick in automaticaly after Droop.

    I can force it manualy into EM Heat.
    I don't know for sure if the Gas heat comes on below cross over value yet.

    Equipment
    Lennox Gas Furnace Model SL280UH090V60C
    Lennox Heat Pump XP14-042-230
    Lennox Coil Model CH33-43C-2F-3
    HoneyWell IAQ TH9421C1004
    3 wires to EIM

    IAQ Installer Settings:
    110 - 0
    120 - 20
    130 -11
    140-12
    150 -17
    160 - 4
    165 - 0
    172 - 2
    173 - 0
    174 - 1
    176 - 1
    190 - 0
    200 - 1
    210 - 0
    220 - E
    240 - E
    280 - 0
    300 - 1
    310 - 3
    320 - 0
    330 - 2
    340 - 0
    342 - 1
    345 - 1
    346 - 0.5
    347 - 2
    350 - 30
    365 - E
    370 - 1
    372 - E
    379 - 0
    400 - 0
    500 - E
    510 - E
    520 - E
    530 - 1
    540 - 4
    580 - 5
    600 - 90
    610 - 60
    640 - 12
    650 - 0
    660 - 0
    670 - 0
    680 - 2
    690 - 2
    700 - 0
    701 - 0
    710 - 0

    Thanks a bunch

  2. #2
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,090
    What do you have 360 set for.
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    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  3. #3
    Join Date
    Aug 2000
    Location
    Central Oregon
    Posts
    749
    Quote Originally Posted by beenthere View Post
    What do you have 360 set for.
    360 isn't set on duel fuel.
    If you think our goverment is screwed up. You haven't lived in another country.

  4. #4
    Join Date
    Aug 2000
    Location
    Central Oregon
    Posts
    749
    Installer settings are good. How did you check droop?

    Emergency heat is not automatic. You have to set it to it. Its a mode of operation that only allows auxilary heat to operate, locking out the primary heat source (heat pump).The stat can't tell if the HP doesn't have 220 power.

    If your furnace doesn't come on after balance point. Call your installer and have him check it. With settings correct, it wouldnt of came on in emergency heat if it was wired wrong. So the malfunction would be the IAQ.
    If you think our goverment is screwed up. You haven't lived in another country.

  5. #5
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,090
    Quote Originally Posted by Tempted View Post
    360 isn't set on duel fuel.
    Then how do you use option 2 for ISU 345
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  6. #6
    Join Date
    Aug 2000
    Location
    Central Oregon
    Posts
    749
    Quote Originally Posted by beenthere View Post
    Then how do you use option 2 for ISU 345
    When I set up a vp 8000 today for Duel fuel it didn't offer 360 only 350.
    350 and 360 Both have settings when Heat strips are auxilary.
    345 1&2 do the samething difference being the auxilary lock out temp of 360.

    If the stat has 2 stages with hp and hs. both can run, staging with run time/temp between 350 and 360 settings. Hp is locked out below 350 balance point, hs is locked out above 360 auxilary lock out. If droop occurs hs is allowed to run above 360 setting.

    Fosil fuel auxilary cant operate with hp so it is locked out with 350 balance point. 345 2 has no lock out set point to bypass.
    If you think our goverment is screwed up. You haven't lived in another country.

  7. #7
    I tested the Droop by cranking the heat demand to 76deg when the house temp was 70. The t-stat didn't give me any indication it was using aux heat.

    Also tried this with 220V disscounected from HP. No heat at all.

    My though was that if the droop was working properly that when I lost 220 power to the HP the t-stat would kick in aux after the house temp fell 2 deg (droop setting) below the asking temp.

  8. #8
    Join Date
    Aug 2000
    Location
    Central Oregon
    Posts
    749
    Quote Originally Posted by JScarrow View Post
    I tested the Droop by cranking the heat demand to 76deg when the house temp was 70. The t-stat didn't give me any indication it was using aux heat.

    Also tried this with 220V disscounected from HP. No heat at all.

    My though was that if the droop was working properly that when I lost 220 power to the HP the t-stat would kick in aux after the house temp fell 2 deg (droop setting) below the asking temp.

    Your thought is almost correct, so your test didn't fit the parameters required. Your stat has to sense the loss of temperature from when it started. Not the set point.
    So if you turned the stat up calling for heat, pulled the disconnect, leaving the stat thinking the hp is running. When the house temp drops "approximately" 2* from the temp it started at 70* to 68*, the stat should call for the furnace to run and disable the call to the hp.

    It's basicly doing the samething you do by putting it in emergency heat except the stat requires the 2* drop and it will call it "auxilary heat".
    If you think our goverment is screwed up. You haven't lived in another country.

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