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  1. #27
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    Sep 2009
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    Arnold mo
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    Problem probably lies in a spider web of low voltage wires somewhere above the basement where somebody wire nutted the outdoor unit to "G".
    An answer without a question is meaningless.
    Information without understanding is useless.
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  2. #28
    Thanks for your help guys. The problem actually was the green and yellow wires being switched! I watched him fix it; the fan on now works like it's suppose to. I'm still trying to figure out how I never had this problem with the old furnace... Anyway, thanks again!

  3. #29
    Join Date
    Nov 2000
    Location
    Eastern PA
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    68,981
    Quote Originally Posted by tac0967 View Post
    Thanks for your help guys. The problem actually was the green and yellow wires being switched! I watched him fix it; the fan on now works like it's suppose to. I'm still trying to figure out how I never had this problem with the old furnace... Anyway, thanks again!
    Uh, yea....some of us would like to know how that worked as well
    Government is a disease...
    ...masquerading as its own cure…
    Ecclesiastes 10:2 NIV


  4. #30
    Join Date
    Nov 2001
    Location
    east kansas
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    8,038
    Quote Originally Posted by RoBoTeq View Post
    Uh, yea....some of us would like to know how that worked as well
    Are you still doubting?

    Maybe the yellow wire never went to the where we assume it went to, maybe it just landed on the thing "G" usually controls. Maybe.
    Last edited by Milk man; 09-15-2011 at 12:04 AM. Reason: I'm I within the rules yet? :)
    Beware of advice given by some guy on the Internet.

  5. #31
    Join Date
    Nov 2001
    Location
    east kansas
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    8,038
    Quote Originally Posted by tac0967 View Post
    Thanks for your help guys. The problem actually was the green and yellow wires being switched! I watched him fix it; the fan on now works like it's suppose to. I'm still trying to figure out how I never had this problem with the old furnace... Anyway, thanks again!
    Thanks for the update.
    Beware of advice given by some guy on the Internet.

  6. #32
    Join Date
    Nov 2000
    Location
    Eastern PA
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    Quote Originally Posted by Milk man View Post
    Are you still doubting?

    Maybe the yellow wire never went to the where we assume it went to, maybe it just landed on the thing "G" usually controls. Maybe.
    I suppose that could have happened. But if the Y and G wires were connected properly to everything else and only switched at the stat, there would be other issues. And, I don't see how the system could work properly before if either the Y or the G controls were not wired.
    Government is a disease...
    ...masquerading as its own cure…
    Ecclesiastes 10:2 NIV


  7. #33
    Join Date
    Jun 2001
    Location
    Moore, Oklahoma, United States
    Posts
    4,508
    Quote Originally Posted by RoBoTeq View Post
    I suppose that could have happened. But if the Y and G wires were connected properly to everything else and only switched at the stat, there would be other issues. And, I don't see how the system could work properly before if either the Y or the G controls were not wired.
    As long as the furnace gets +24v on the G and/or Y terminal the blower will run. If Y and G were backwards at the stat the system will still work as long as the condenser/furnace both had 24v.

  8. #34
    Join Date
    Jun 2011
    Location
    Wake Forest, NC
    Posts
    352
    For me, around here the learning never stops!

    Thanks for the update. I learned something new today. Now I can call it a day.
    It's not rocket-science...

    It's electromechanical thermodynamic engineering

  9. #35
    Join Date
    Nov 2000
    Location
    Eastern PA
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    Quote Originally Posted by 54regcab View Post
    As long as the furnace gets +24v on the G and/or Y terminal the blower will run. If Y and G were backwards at the stat the system will still work as long as the condenser/furnace both had 24v.
    If it is a variable speed blower, yes. Most psc motor furnaces, the Y terminal is just there as a connection spot and not connected to anything in the furnace. We were not told anything about the furnace that I recall reading.
    Government is a disease...
    ...masquerading as its own cure…
    Ecclesiastes 10:2 NIV


  10. #36
    Join Date
    Jan 2004
    Location
    PA
    Posts
    68,795
    Quote Originally Posted by RoBoTeq View Post
    If it is a variable speed blower, yes. Most psc motor furnaces, the Y terminal is just there as a connection spot and not connected to anything in the furnace. We were not told anything about the furnace that I recall reading.
    Most newer PSC blower furnaces will run the blower if thy receive 24 volts on the Y, weather or not the G has 24 volts.

    All the Affinity PSC blower models do.
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  11. #37
    Join Date
    Nov 2000
    Location
    Eastern PA
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    68,981
    Quote Originally Posted by beenthere View Post
    Most newer PSC blower furnaces will run the blower if thy receive 24 volts on the Y, weather or not the G has 24 volts.

    All the Affinity PSC blower models do.
    Ahhh, good to know.
    Government is a disease...
    ...masquerading as its own cure…
    Ecclesiastes 10:2 NIV


  12. #38
    Join Date
    Dec 2002
    Location
    Houston,Tx.
    Posts
    16,122
    Quote Originally Posted by beenthere View Post
    Most newer PSC blower furnaces will run the blower if thy receive 24 volts on the Y, weather or not the G has 24 volts.

    All the Affinity PSC blower models do.
    That would be correct, and the G usually operates the fan on speed.
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  13. #39
    Join Date
    Jun 2001
    Location
    Moore, Oklahoma, United States
    Posts
    4,508
    On my system G runs the fan at heat speed, Y runs the fan at cool speed. G input is ignored when the furnace gets the Y command.

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