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  1. #1

    Problems with Programmable Thermostat

    Hi! First time poster here and I could really use some help.

    I just replaced a non-programmable digital thermostat with a new Honeywell RTH-6450 5-1-1 programmable stat. Installation was a breeze and my air conditioner is working perfectly. However, I'm confused as to how to set up the advanced settings for my heating system.

    I live in a condo building and checked with the original HVAC installer, who informed me that I have a two-stage heating system with perimeter radiant heat/forced air. As far as I recall, it's always worked where the radiant heat comes on first and then, rarely, the forced air engages if necessary. The installer told me to set everything up for electric in the advanced settings, which I did. I also made sure to enter the setting for single-stage air/two-stage heating (I checked and I do have both W and W2 wires hooked up for heat). However, when I tested the heat by knocking the temp up two degrees from the room temp, the blower came on immediately. As I said, I don't believe the blower is supposed to come on right away.

    My advanced settings are as follows:

    Function 1: "System type"
    I entered #7 - "Heat/Cool Multiple Stages: Two heat stages (wires on W and W2), one cooling stage (wire on Y)"

    Function 3: "Heating fan control"
    I entered #2 - "Electric heat"

    Function 5: "Heating cycle rate"
    I entered #2 - "Electric furnace"

    Function 6: "Stage 2 Heat cycle rate"
    I entered #9 - "Electric furnace"


    What did I do wrong? I even tried switching Function 5 to #3 - "Hot water or high efficiency furnace", thinking that this might work since the radiant heat uses hot water pumped through a pipe in the floor, but nothing changed.

  2. #2
    Join Date
    Feb 2008
    Location
    Waffleville
    Posts
    10,339
    too many variables. you may be in for a call to your contractor.

    how long are you waiting?

    is it making a call for second stage then turning on the equipment?

    depending on the way everything is set up, you may only need one stage heat at the thermostat.

    as i said, too many variables
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  3. #3
    I sure hope you're wrong about needing a contractor simply to set a programmable thermostat. Obviously, I'd rather avoid the charge if possible.

    I have no idea if it's making a call for the second stage. How could I determine this?

    Do you think I should try setting a single stage at the thermostat? How could this be possible if I've got both W and W2 wires connected?
    Last edited by WindyCity1014; 09-16-2011 at 11:47 PM.

  4. #4
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,924
    first, please remove the pricing from your post. We cannot discuss pricing here.



    Now, I agree with beachtech.

    When you are setting up something like this, you need to get everything setup correctly or comfort or efficiency is compromised.

    Think of it this way.... Would you rather spend the money on a one time service trip or spend it over and over again in energy bills?

  5. #5
    I'm not trying to be rude, but aren't you guys being a bit harsh and dismissive? It doesn't seem like you're really making much of an effort to try to help me. I thought this was a forum for people to ask the pro's. If I wanted to call a pro, I would have done so without coming here first.

    I'm not adverse to paying a contractor when necessary--in fact, I just paid over $*** for some unrelated work on my HVAC system last week. However, I'd like to think that it wouldn't be that complicated to set up a thermostat marketed to DIY homeowners.

    Now, can someone try to answer my questions in post #3?

  6. #6
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,924
    For an expert standing there, nope. Not difficult at all.

    For me, sitting in my shorts at my kitchen table trying to decipher your system from here.....

    Adds to the difficulty as I cannot see it from here.

    If you are insisting on doing it yourself, first, you must have a functional familiarity with how control circuits work and how to test them as well as having the proper tools to do so.

    The next step would be to sit down and read the entire manual rather than going by what someone told you. While reading, make notes about the stat's operation and how you want it to control your system.

    Then, program the thermostat according to your notes.

    Then, you TEST it to verify that it is working according to your plan.

    Simple enough for you?

  7. #7
    Quote Originally Posted by jpsmith1cm View Post
    For an expert standing there, nope. Not difficult at all.

    For me, sitting in my shorts at my kitchen table trying to decipher your system from here.....

    Adds to the difficulty as I cannot see it from here.

    If you are insisting on doing it yourself, first, you must have a functional familiarity with how control circuits work and how to test them as well as having the proper tools to do so.

    The next step would be to sit down and read the entire manual rather than going by what someone told you. While reading, make notes about the stat's operation and how you want it to control your system.

    Then, program the thermostat according to your notes.

    Then, you TEST it to verify that it is working according to your plan.

    Simple enough for you?
    Awesome! Thanks for all the help!

  8. #8
    Join Date
    Dec 2006
    Location
    toronto, canada
    Posts
    551
    radiant heat, not electric heat element? your original hvac installer may be wrong.

  9. #9
    Join Date
    Nov 2010
    Location
    N. Idaho
    Posts
    586
    Time is money and it sounds like u are spending to much time on this stat. Should have spent a little bit of money to have your contractor install it.

    Could be done now, with you spending your time enjoying the comforts of home. See it to often people trying to diy, end up spending more money AND time to resolve an issue.

  10. #10
    Join Date
    Jan 2004
    Location
    PA
    Posts
    68,769
    Most RTH thermostats will call for second stage heat if you set the temp 2 degrees higher then room temp.
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  11. #11
    Quote Originally Posted by vibration View Post
    radiant heat, not electric heat element? your original hvac installer may be wrong.
    From what I understand there's a pipe underneath my hardwood floor that runs along the perimeter and hot water is pumped through as the first stage of heating. Have you ever heard of this type of system?

  12. #12
    Quote Originally Posted by Damien View Post
    Time is money and it sounds like u are spending to much time on this stat. Should have spent a little bit of money to have your contractor install it.

    Could be done now, with you spending your time enjoying the comforts of home. See it to often people trying to diy, end up spending more money AND time to resolve an issue.
    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.

  13. #13
    Join Date
    Nov 2006
    Location
    Southeastern Pa
    Posts
    19,519
    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.

    Ok, you asked.

    First, this is definitely not a DIY site. Right out of the gate, you are asking for help regarding a DIY stat install. So, you should expect people to be a little resistant to that circumstance.

    What "makes us feel good" is directing people to a contractor they trust. It doesn't have to be one of us, either. If you go that route, you have recourse when something goes wrong. You can receive instruction about how it works, and why. And you save a lot of time and trouble in the process.

    We see this situation a lot. It does not make us feel good when a homeowner falls flat or has a problem. That's why we recommend that all homeowners find and cultivate a relationship with a good company for their HVAC needs.

    That's why DIY is often a bad idea. It's not like going to a class at HD about putting in a tile backsplash or replacing a bathroom faucet. In fact, most of the good equipment cannot be purchased at HD for consumer installation.

    Does that improve the perspective a little?
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