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  1. #1

    Harmony Zone Controller without variable speed

    Hey Folks. I am looking for some Harmony zone controller experience. To sum up a long story, I need to get the Harmony working with a nice dual stage Lennox condenser but a three speed blower in the air handler, not variable. Will essentially be using an older air handler where cooling currently uses fixed high speed, heating uses med speed and low is unused. I know that the Harmony uses a voltage control to tell the air handler where to set the blower, but there must be a way to operate two or three speed blower based on demand level from the Harmony.

    So to reiterate into a question, can the Harmony be configured to operate a two or three speed blower?

  2. #2
    Join Date
    Feb 2008
    Location
    Western NC
    Posts
    2,504
    Quote Originally Posted by kazko View Post
    Hey Folks. I am looking for some Harmony zone controller experience. To sum up a long story, I need to get the Harmony working with a nice dual stage Lennox condenser but a three speed blower in the air handler, not variable. Will essentially be using an older air handler where cooling currently uses fixed high speed, heating uses med speed and low is unused. I know that the Harmony uses a voltage control to tell the air handler where to set the blower, but there must be a way to operate two or three speed blower based on demand level from the Harmony.

    So to reiterate into a question, can the Harmony be configured to operate a two or three speed blower?
    Your Frankenmonster will give you nothing but problems....

    The 2 speed or dual speen condenser is designed with a varible speed air hanler, not multi speed.


    And the harmony works with variable speed blowers, not multi speed. Wont work, your ideas are far fetched.


    Get the system installed properly by a contractor. A contractor that will install matching components.
    I fully support the military and the War on Terrorism.


    If you don't know, then don't do. If you don't know and still do, then be prepared to pay someone else a lot to undo what you did and then do it right.

    If you do know, then do. But do it right. Otherwise, you may not be doing it long.

  3. #3
    Join Date
    May 2002
    Location
    Houston Texas
    Posts
    6,316
    In a word NO!

  4. #4
    Join Date
    Dec 2002
    Location
    Arizona
    Posts
    4,341
    What he said! You are looking for nothing but big problems.

  5. #5
    Join Date
    Mar 2005
    Location
    Suppy NC
    Posts
    4,513
    it wont work complete waist of time

  6. #6
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,765
    Would be some awlfull rigging if you got it to work at all.
    You won't have humidity control because the blower won't slow down when in first stage.
    So your customer will have spent a lot of money on a comfort condenser, that isn't providing comfort. And may end up using more electric, then they did with their old unit.

    Tell them you can install a nice VS blower air handler, or sell them a Single stage condenser.
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    How many times must one fix something before it is fixed?

  7. #7
    Join Date
    Mar 2005
    Location
    burlington county n.j.
    Posts
    9,709
    it could be done but it would be a pita to set up.

    could control blower speed with a slave relay tied into condenser control circuit.

    no way to control heat blower speed and it would probably need bypass damper or a dump zone.

    discharge air sensor to control compressor stages.

  8. #8
    Join Date
    Jun 2008
    Location
    west point, ga.
    Posts
    328
    Like my boss tells us "DO IT RIGHT OR GO THE HELL HOME"
    So I say no.

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