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-   -   No Power to A/C Thermostat (https://www.askmehelpdesk.com/showthread.php?t=354000)

  • May 16, 2009, 02:42 PM
    KenLoh
    Quote:

    Originally Posted by Joshdta View Post
    for like drain water? This could defentally be your problem

    Maybe I have a clogged pipe there and it's shutting the system down? Hmm.. let me take a look and see if I can dig in that pipe where the wire goes in...
  • May 16, 2009, 02:43 PM
    KenLoh

    These should help answer some questions:


    http://img194.imageshack.us/img194/1...rhandler08.jpg

    http://img194.imageshack.us/img194/604/airhandler09.jpg

    http://img194.imageshack.us/img194/787/airhandler10.jpg

    http://img194.imageshack.us/img194/3...rhandler11.jpg
  • May 16, 2009, 02:49 PM
    Joshdta

    I bet this is your problem this is a drain safety. That is why after awhile your t-stat will light back up after the water drains. You can jumper this switch to make sure it is the pproblem. Then if it is unclocge the drain.
  • May 16, 2009, 02:58 PM
    KenLoh

    Yessss!!!!! Bingo!!!!!
    :D :D :D :D :D

    http://img41.imageshack.us/img41/6392/yeababyyea5mn.gif
  • May 16, 2009, 02:59 PM
    Joshdta

    Great!! Glad we finally got to the bottom of this problem.
  • May 16, 2009, 03:08 PM
    KenLoh

    Josh, I want to thank both you and KISS (what's your name! ) for hanging in there with me. You guys been very helpful. Mann... a simple thing like that and I went on the wild goose chase, LOL!
    But I have learned a lot from this experience. Before this I had no knowledge or experience with the HVAC system at all.

    Thank you once again! Appreciate the help and support Greatly! I hope someone else in the future will benefit from this long thread... hey, lots of pictures!! LOL!
  • May 16, 2009, 03:11 PM
    Joshdta

    Yes I am sure someone will have this same issue with ac season coming on strong. Now all you have to do is put everything back the way it was lol. Have a great weekend.
  • May 16, 2009, 03:13 PM
    KenLoh

    I regret doing something in the haste and excitement... when I opened up the cap to the pvc pipe, saw the water, I used a thin dowel and gently pushed it into the pvc pipe. The water globbed and drained down. I should have used a wire to fish up whatever that's clogged in the pipe!

    Oh Well... I'll keep an eye on it. Hope it was just a ball of lint or something.

    Hey Josh and KISS... I'll buy you both a beer! Let's Go!:D
  • May 16, 2009, 03:16 PM
    Joshdta

    Sounds good, you should be good for awhile now. Just rember if this ever happens again. If you have enough points you can rate mine and kiss's answers. Would really be apreaciated. If you ever need anything else look me up. Josh
  • May 16, 2009, 03:29 PM
    KenLoh
    Quote:

    Originally Posted by Joshdta View Post
    sounds good, you should be good for awhile now. Just rember if this ever happens again. if you have enough points you can rate mine and kiss's answers. would really be apreaciated. If you ever need anything else look me up. Josh

    How do I rate answers for you and KISS? There are only "Rate this answer" buttons on my own posts. I don't see any option on other's posts. This is different than those on other forums I'm on.
    Please elaborate on how to...
  • May 16, 2009, 03:43 PM
    KenLoh

    I clicked on the green reputation icon, it doesn't give me the option to give points. Weird. Maybe one has to be a member for a certain period, or after a certain number of posts before this function is enabled?

    Btw, Thanks for your points, Josh! :)
  • May 16, 2009, 04:40 PM
    KenLoh

    Mann... it sure feels good to have AC again... something we all take for granted sometimes. And it feels even better to have finally nailed the problem!:D


    For general knowledge, and for future reference, what kind of system/unit do I have? (heat pump/electric furnace/what stage? Etc). How should I describe it? The last few pics I posted should help I hope.
  • May 16, 2009, 04:43 PM
    Joshdta

    You have a heatpump with 2 stage electric heat.
  • May 16, 2009, 05:14 PM
    KenLoh
    Quote:

    Originally Posted by Joshdta View Post
    you have a heatpump with 2 stage electric heat.

    Thanks!

    Did you figure out how or why I can't give rep points?
  • May 16, 2009, 05:58 PM
    KISS

    I disagree, your system is a 3 stage heat heat pump with backup electric heat and 1 cool.

    Your thermostat is 1 heat/1cool heat pump with 3 stage electric aux heat

    You might want to consider connecting a jumper between W2 and W3 at the furnace.

    Right now, you are not using the 3rd stage aux heating.

    You might actually have a 4 stage heating system:

    Y, Y+W1, Y+W1W2, Y+W1+W2+W3

    The thermostat is not the right one. You can get a lot better energy savings if a sensor and the proper thermostat is placed outside.

    The sensor determines when the Heat Pump is allowed to run.
  • May 16, 2009, 06:19 PM
    king fisher
    On the transformer you should have 120v one side and the other side you should have 24v. Something is causing the power to go out.IT might be your fan motor/run cap.
  • May 16, 2009, 07:46 PM
    Joshdta
    Quote:

    Originally Posted by KeepItSimpleStupid View Post
    I disagree, your system is a 3 stage heat heat pump with backup electric heat and 1 cool.

    Your thermostat is 1 heat/1cool heat pump with 3 stage electric aux heat

    You might want to consider connecting a jumper between W2 and W3 at the furnace.

    Right now, you are not using the 3rd stage aux heating.

    You might actually have a 4 stage heating system:

    Y, Y+W1, Y+W1W2, Y+W1+W2+W3

    The thermostat is not the right one. You can get a lot better energy savings if a sensor and the proper thermostat is placed outside.

    The sensor determines when the Heat Pump is allowed to run.


    There are only 2 heating elements how can it be 3 or 4 stage? Inless I missed something in the picture.
  • May 16, 2009, 08:50 PM
    KenLoh
    Quote:

    Originally Posted by Joshdta View Post
    There are only 2 heating elements how can it be 3 or 4 stage? Inless i missed something in the picture.

    If I'm not mistaken, I think the fins below the fan cools or heats, and there is an additional set of heat elements above the fan?
  • May 16, 2009, 09:01 PM
    KenLoh
    Quote:

    Originally Posted by KenLoh View Post
    How do I rate answers for you and KISS? There are only "Rate this answer" buttons on my own posts. I don't see any option on other's posts. This is different than those on other forums I'm on.
    Please elaborate on how to....

    Quote:

    Originally Posted by KenLoh View Post
    I clicked on the green reputation icon, it doesn't give me the option to give points. Weird. Maybe one has to be a member for a certain period of time, or after a certain number of posts before this function is enabled?

    Now I see the "Rate This Answer" option appear in all the posts. Incidentally, my "New Member" has been upgraded to "Junior Member". So I think it must have been a feature made available only after a certain number of posts.
  • May 17, 2009, 07:16 AM
    KISS

    I need to come back to this. Take a look at:

    http://www.white-rodgers.com/wrdhom/...s/37-4244E.pdf

    In this system W2 and W3 are not connected, so those stages are not used or are not present.

    W1 could mean heat strip #1
    W2 could mean heat strip #2 (not connected)
    W3 could mean heat strip #1 and #2 (not connected)

    Y + O/B can mean heat pump

    Right now, confused.

    Ken: That's how you can have 3 stages with two strips.

    It's also how you can have 4 total heat sages.

    Something is difficult to understand here.

    W1 evidently is not connected to Y1 or O/B and therefore W1 isn't part of the heat pump circuit.

    More reading...
  • May 17, 2009, 07:24 AM
    KISS

    Here is a 4 heat/2 cool stat.

    Buy Honeywell VisionPro IAQ Programmable Universal Thermostat with Total Home Comfort Control | Honeywell YTH9421C1002

    I need to look at it a bit more.
  • May 17, 2009, 09:00 PM
    KISS

    Got some advice. Best one can tell there are 4 stages of heat.

    You might consider jumping W1 to W2 to W3 assuming you have a 2 stage heating stat. From my advice, the air handler will sequence stage if the thermostat doesn't. It might provide better recovery on cold days.
  • Jul 21, 2010, 07:47 PM
    sgtaxe
    I have a similar setup and problem. My question is: if there is no 24 VAC between R & C. the fuse is good, and there are no loose wire or connections that I have found. Is it most likely the board that is blown?

    I have no fan when I switch tstat to fan on, and of course no a/c at all.

    Thanks
    Sgtaxe


    Quote:

    Originally Posted by KeepItSimpleStupid View Post
    This reads well. Kinda interesting reading.

    I'd focus your immediate attention on the following two terminals. R & C.

    The next time it fails check R & C at the furnace first and R & C at the thermostat. There should be 25 VAC between these terminals at all times.

    Those two terminals should go to the transformer in the air handler. There should be 4 terminals or wires. Two go to 120 VAC and two go to R &C.

    Look for any loose connections in any of these wires.

    There also may be a 3 A automotive type fuse on the control board. Re-seat that.

    You need 24 VAC between R & C for the tstat to have power.


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