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  1. #1
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    Nov 2018
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    Trane Wiring Color help!

    Hey Guys,

    I noticed that my furnace (Trane Furnace BLD045L/BLD068L/BLD090L) has 5 wires coming out of it to the thermostat (White, Black, Grey, Grey stripe, Yellow stripe).

    Currently, the White wire is connected to W on the thermostat and black is connected to Rh. This works correctly since it is only a furnace.

    My question is what are the Grey, Grey stripe and Yellow Stripe wires. Is one of them the Fan Only wire?
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  2. #2
    Join Date
    Aug 2002
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    Southold, NY
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    Why ar there exposed wires in there?

  3. #3
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    Nov 2018
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    Thread Starter
    Yea, just moved in and notice it also, so I’m capping them off.

  4. #4
    Join Date
    Nov 2006
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    Athens, Ohio
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    Why are the red and white wire connections exposed?

    The other wires will be for the fan relay, common, and a cooling speed connection. Cap them and don't worry about them.
    AOP Rules: Rules For Equipment Owners.

    Free online load calculator: http://www.loadcalc.net/


    There = not here. Their = possessive pronoun. They're = they are
    It's = contraction of it is. Its = the possessive form of it
    Too = also. To = expressing motion. Two = 2
    Then = after that, next. Than = indicates a comparison.
    Questions should end with a question mark "?" Statements end with a period "."

  5. #5
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    Thread Starter
    Thanks, they are already capped. So which wire is the fan, itÂ’s usually green right?

  6. #6
    Join Date
    Nov 2006
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    Athens, Ohio
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    Manufacturers make their own color choices. The wiring diagram will have that information.
    AOP Rules: Rules For Equipment Owners.

    Free online load calculator: http://www.loadcalc.net/


    There = not here. Their = possessive pronoun. They're = they are
    It's = contraction of it is. Its = the possessive form of it
    Too = also. To = expressing motion. Two = 2
    Then = after that, next. Than = indicates a comparison.
    Questions should end with a question mark "?" Statements end with a period "."

  7. #7
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    Aug 2002
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    Quote Originally Posted by vtince View Post
    Thanks, they are already capped. So which wire is the fan, itÂ’s usually green right?
    Color doesn’t matter.
    When in doubt trace them out!

  8. #8
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    Thread Starter
    Quote Originally Posted by pecmsg View Post
    Color doesn’t matter.
    When in doubt trace them out!
    Thanks, can you give me a bit more insight on how to do this?

  9. #9
    Join Date
    Jan 2014
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    Quote Originally Posted by vtince View Post
    Thanks, can you give me a bit more insight on how to do this?
    Read post 6 again to answer your question

  10. #10
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    Quote Originally Posted by vtince View Post
    Thanks, can you give me a bit more insight on how to do this?
    Why are you messing with it.
    You don’t know the wiring or control sequences so leave it to the professionals!

  11. #11
    Join Date
    Nov 2018
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    Thread Starter
    Yes, however I cannot find a wiring diagram for my unit, and I've been searching for a while. This unit probably came installed when the house was built in the 80's.

  12. #12
    Join Date
    Aug 2009
    Location
    Beatrice, NE
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    Quote Originally Posted by vtince View Post
    Yes, however I cannot find a wiring diagram for my unit, and I've been searching for a while. This unit probably came installed when the house was built in the 80's.
    Yes, that unit is very old, surprised it has not died yet. Best of my knowledge Trane never used Grey wires, and for some reason I don't believe the yellow one is yellow. I think they have discolored with time. Best not to touch them or you may end up without heat and a dead transformer.

  13. #13
    Join Date
    Jul 2006
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    Prata di Pordenone
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    i would call a pro and get that furnace inspected , have found many with cracked heat exchanger . the site bylaws do not allow the type of help you are asking for
    Go Trump

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