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  1. #14
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    Sep 2002
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    Quote Originally Posted by beenthere View Post
    Most RTH thermostats will call for second stage heat if you set the temp 2 degrees higher then room temp.
    Do the pro grade TH thermostats work differently in this regard?

    I always though the honeywells call for second stage based on rate of change, not differential.
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  2. #15
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    Nov 2010
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    Quote Originally Posted by WindyCity1014 View Post
    I don't get some of you people. Does it make you feel good to pile on and make an example out of me? How are your comments even remotely helpful? I belong to quite a few online forums dealing with a variety of subjects, and I can honestly say that I've never seen newbies treated with such hostility and disdain.
    Wow, in the last 3 days I have been running across too many people jumping to conclusion way to fast...

    I am simply stating some facts that were presented. Making my comment did not "make me feel good". Just trying to give you some insight to the fact that some things are better left to a professional.

    I have come across some of my own customers thinking they will save some money, buy a stat at those big box stores, only to install themselves and not have the equipment work afterwords. I tell them the same thing, Should have just called me in the first place and saved themselves time and aggravation.

    Not only will a contractor come and install one of their Stats but it will also come with some sort of guarantee. Its not just $ to throw a stat on to a wall and leave, you are buying knowledge and an expertise we didnt pick up off the street, but payed for ourselves.

    And like others have posted, we help when we can, sometimes we cant resolve an issues from our keyboards. So the fact that I told you, if you had a paid a pro in the first place you wouldnt be having any of these Q & A's, sounds like good advice to me!!!

  3. #16
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    Nov 2006
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    Quote Originally Posted by amd View Post
    Do the pro grade TH thermostats work differently in this regard?

    I always though the honeywells call for second stage based on rate of change, not differential.
    If the adaptive function is selected, it will bring second stage on early if it has learned that is necessary. Otherwise, it should be based on differential if a new setpoint is selected.
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  4. #17
    Join Date
    Dec 2005
    Location
    Cincinnati, Oh
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    5,312
    Quote Originally Posted by timebuilder View Post
    If the adaptive function is selected, it will bring second stage on early if it has learned that is necessary. Otherwise, it should be based on differential if a new setpoint is selected.
    Note:
    Adaptive intelligent recovery only applies to a schedule, not manual thermostat adjustment.
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  5. #18
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    Jan 2004
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    Quote Originally Posted by amd View Post
    Do the pro grade TH thermostats work differently in this regard?

    I always though the honeywells call for second stage based on rate of change, not differential.
    All higher end Th series thermostats use an algorithm and temp difference, but its 1 degree on them.

    The IAQ goes to second stage when it determines that first stage is at 90% capacity of the load.

    RTH series seem to have a looser temp tolerance then TH series.
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  6. #19
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    Nov 2006
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    Quote Originally Posted by hvacvegas View Post
    Note:
    Adaptive intelligent recovery only applies to a schedule, not manual thermostat adjustment.
    I think I said that.
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  7. #20
    Join Date
    Feb 2007
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    Quote Originally Posted by timebuilder View Post
    I think I said that.
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  8. #21
    Join Date
    Aug 2008
    Posts
    416
    Reading thru this thread, I like the theory proposed by BeenThere. So OP if you're still reading, BeenThere has advised you (he can do that as he's a pro) that mechanically moving the setting 2 degress will automatically force the 2nd stage to engage, so if he is right, you assumed that the tstat operated differently. Under his theory, you will have to wait for cold conditions when the 1st stage can't keep up and a call for the 2nd stage is made.

    You might also call the Honeywell support line for advice. Maybe they have a tip/technique for testing....

    The following is from Honeywell's tech support FAQ for tstats:

    Answer: The thermostat takes the temperature override as a need to reach the new temperature setting right away. It will run the backup heat only as long as necessary to reach new temperature setting.

    Applies to model numbers: ChronothermIV,ChronothermIVPlus,FocusPRO,PC8900,Pr estige,RTH3100,RTH7400,RTH7500,RTH7600,RTH8500,T80 11,T8411,T8611,TH8320,TH8321,TH9421,THX9321,Vision PRO,YTH9421

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