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  1. #1
    Join Date
    Oct 2006
    Location
    Northwest NC
    Posts
    70

    Question Variable speed blowers

    I am trying to find info on some of the new variable speed furnaces and heat pumps on the market. More specifically, I am wanting to know how to connect an extra fan relay so that the blower will run on high speed instead of half speed. I install waterstoves to existing furnaces. I normally break the fan(green) wire from the thermostat through an NC terminal on a relay and power the fan with the corresponding NO terminal to prevent backfeed to the thermostat and energize "G" on the terminal strip. According to some folks I have talked to, on the new variable speed units, the "G" terminal will only bring the fan up to half speed. How can I hook up an extra relay and bring the fan up to full speed? I realize that every manufacturer will probably have a different way, but I'm hoping they will be similar.
    I have never been lost, but I will admit to being confused for several weeks.-Daniel Boone-

    Just because a person wanders does not mean he is lost.

  2. #2
    Join Date
    Jan 2004
    Location
    PA
    Posts
    68,789
    Even though you are a contractor.
    This type of instruction is not allowed to be given out in the open resi forum.

    Home owners could try it themselves, and damage something.

    But its really easy to do what you want.
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    How-to-apply-for-Professional

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

  3. #3
    Join Date
    Jun 2007
    Location
    Central, FL
    Posts
    871
    update to pro status and will talk
    WARNING:IF YOU DON'T KNOW THEN DON'T DO, SO THOSE WHO KNOW WHAT YOU DIDN'T KNOW DON'T END UP UNDOING WHAT YOU DID SO IT COULD GET DONE RIGHT!

  4. #4
    Join Date
    Jan 2004
    Location
    PA
    Posts
    68,789
    He needs more post before he can apply.
    I think it 15 post to apply.
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    How-to-apply-for-Professional

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

  5. #5
    Join Date
    Oct 2006
    Location
    Northwest NC
    Posts
    70
    I'm working on the posts. will be there soon. Thanx
    I have never been lost, but I will admit to being confused for several weeks.-Daniel Boone-

    Just because a person wanders does not mean he is lost.

  6. #6
    Join Date
    Apr 2007
    Location
    Dallas TX
    Posts
    192
    beenthere? 16,411 posts? do you have writer's cramps yet? Makes me feel 'un-helpful' ;^)

  7. #7
    Join Date
    Jan 2004
    Location
    PA
    Posts
    68,789
    LOL.

    Only about 11 post a day.

    And some of them are just , Yep, or nope, post.
    Contractor locator map

    How-to-apply-for-Professional

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

  8. #8
    Join Date
    Apr 2007
    Location
    Dallas TX
    Posts
    192
    just a 'yep', well keep it up. I have some customers who think "Yes, because" is too much info:-)

  9. #9
    Join Date
    Nov 2000
    Location
    Eastern PA
    Posts
    68,981
    Quote Originally Posted by nubbin View Post
    beenthere? 16,411 posts? do you have writer's cramps yet? Makes me feel 'un-helpful' ;^)
    Ridiculous, ain't it?
    Government is a disease...
    ...masquerading as its own cure…
    Ecclesiastes 10:2 NIV


  10. #10
    Join Date
    Aug 2004
    Location
    North Richland Hills, Texas
    Posts
    14,915
    I wouldn't call them "new", unless you consider something that has been in use for 2 decades "new".

    Without getting to technical, the Y(Y2) terminal, and a double pole single throw relay, with a set of NO and a set of NC contacts, are your friends.
    Last edited by mark beiser; 03-23-2008 at 11:33 AM.
    If more government is the answer, then it's a really stupid question.

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