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  1. #1
    Join Date
    Dec 2018
    Location
    Richmond, CA, USA
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    Confused Any tricks to the controls for a 1998 Trane 10-ton rooftop packaged unit?

    I have been requested to fix an existing Trane, nominal 10-ton rooftop packaged unit.

    Model # YCH120C3LOAA
    Serial # N12102596D

    manufactured 3/ 1998 (yes, 20+ years old)

    This is an existing HVAC unit, of course I recommended replacement, but no money for that.

    Problem: The thermostat is dead (blank, no power to stat)

    The unit has 24-volt power, and it has a weird control terminal strip with the numbers 1-20 on it. Apparently 13 or 14 of the terminals are not used.

    No R, Y, C, W, G, W2 or Y2 terminals (just the numbers 1 - 20). There are 2 "Test" terminals at the top, and if you jumper those together, it runs through a test cycle (fan, cool 1, cool 2, heat), then repeats until the power is shut down and then on again.

    There are conventional R (red), G (green), Y (yellow), W (white) thermostat wires connected to random numbers, but nothing is labeled.

    Any ideas on how to wire this up for a conventional thermostat?

    Thanks!

    Andrew (newbie)

    I am licensed, CA C-20 contractor (not a DIY).

  2. #2
    Join Date
    Mar 2008
    Location
    kansas
    Posts
    1,799
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    Sounds like voyager controls re you trying to use traditional 4 wire stat if so you need a cti to make that happen. What was controlling it? If it works in test mode you obviously have control issues not mechanical. Sorry need to read better cti ( conventional thermostat interface) or some acronym like that.
    Honeywell you can buy better but you cant pay more

    I told my wife when i die to sell my fishing stuff for what its worth not what i told her i paid for it

  3. #3
    Join Date
    Nov 2011
    Location
    East Side
    Posts
    7,507
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    trane uses VDC for their stats. if it runs in test mode, the unit isn't the issue.

    get your post count up and apply for PRO membership. we can go in depth and provide all the test literature you need on the closed side of the board.


    you may try google searching for The trane BLACK book. it has all the reliatel information.

  4. #4
    Join Date
    Dec 2007
    Posts
    9,482
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    Others are saying test mode, do you even know what that is?

    I bet he does not, since he is here asking questions about a dead stat.
    The Food Stamp Program, administered by the U.S. Department of Agriculture, is proud to be distributing the greatest amount of free meals and stamps EVER.
    Meanwhile, the National Park Service, administered by the U.S. Department of the Interior, asks us to "Please Do Not Feed the Animals". Their stated reason for this policy "... the animals become dependent on handouts and will not learn to take care of themselves."
    from an excerpt by Paul Jacob in Sun City, AZ

  5. #5
    Join Date
    Jul 2007
    Location
    Virginia
    Posts
    11,844
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    Quote Originally Posted by 71CHOPS View Post
    get your post count up and apply for PRO membership. we can go in depth and provide all the test literature you need on the closed side of the board.


    While you are working on getting that post count up, please fill out a more complete profile on yourself, including the most important part - an email address.
    Instead of learning the tricks of the trade, learn the trade.

  6. #6
    Join Date
    Nov 2006
    Location
    Southeastern Pa
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    32,179
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    While the pro membership and post count are excellent ideas, lets back up for a moment.

    At this point, no amount of posting in an internet forum is going to make you prepared to work on this unit, this week. The Voyager series has a very large book that explains its theories of operation, and it can take years to fully digest that info.

    I follow up on guys who have been sent out to work on equipment they have never before seen, and the outcome is not good.

    Here is my suggestion. Find a friend or a coworker, a guy who can stand in front of this unit with you, and step by step, point out the unique aspects of the Voyager design, answer your questions, and suggest a repair strategy for this situation. You will get up to speed much faster, and your customer will get the experienced service that they deserve as well.

    Start by asking your boss to send someone with you to go over this machine.

    What is a C20 contractor? Is that Canada, or California? What does the "20" indicate?

    How long have you been in the business as a tech?

    When did you start learning? How? School? OJT?

    Describe how you found yourself in front of this machine. Were you asked by a building owner who knows you, or were you sent out by your company? What kind of systems do you usually service? What brands?

    As mentioned above, we need a better profile, since this is the stage where we get to know who and what you are, so we are cautious. I'm sure you can appreciate the need for that caution.

    When you submit your docs and get approved for pro status, an entire world of well informed, experienced people can help you in very nuts and bolts ways. Here in the open, an unknown person (to us) mandates a slow walk toward being an insider here.

    I know you will get a lot out of this once you are vetted. Welcome, and we will help you as soon as we can.
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist
    Member, IAEI

    AOP Forum Rules:







  7. #7
    Join Date
    Nov 2006
    Location
    Southeastern Pa
    Posts
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    I just noted the username, "baja mechanical," so yeah...it must be CA for California. My bad.
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist
    Member, IAEI

    AOP Forum Rules:







  8. #8
    Join Date
    Apr 2010
    Location
    California
    Posts
    660
    Post Likes
    Quote Originally Posted by Baja Mechanical View Post
    I have been requested to fix an existing Trane, nominal 10-ton rooftop packaged unit.

    Model # YCH120C3LOAA
    Serial # N12102596D

    manufactured 3/ 1998 (yes, 20+ years old)

    This is an existing HVAC unit, of course I recommended replacement, but no money for that.

    Problem: The thermostat is dead (blank, no power to stat)

    The unit has 24-volt power, and it has a weird control terminal strip with the numbers 1-20 on it. Apparently 13 or 14 of the terminals are not used.

    No R, Y, C, W, G, W2 or Y2 terminals (just the numbers 1 - 20). There are 2 "Test" terminals at the top, and if you jumper those together, it runs through a test cycle (fan, cool 1, cool 2, heat), then repeats until the power is shut down and then on again.

    There are conventional R (red), G (green), Y (yellow), W (white) thermostat wires connected to random numbers, but nothing is labeled.

    Any ideas on how to wire this up for a conventional thermostat?

    Thanks!

    Andrew (newbie)

    I am licensed, CA C-20 contractor (not a DIY).
    Check for 24 volts at the thermostat. If you have 24 volts, replace the stat. If you do not have 24 volts, go to the transformer and check for 24 volts output. If you have 24 volts output, you have an open stat wire. Either replace, and or wire around it. If you do not have 24 volts, check the primary line voltage to the transformer. If you have line voltage, you have a bad transformer, replace it.

  9. #9
    Join Date
    Nov 2006
    Location
    Southeastern Pa
    Posts
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    We try to keep most of the directed diagnostics in the Pro member area, per our site rules.

    Thanks.
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist
    Member, IAEI

    AOP Forum Rules:







  10. #10
    Join Date
    Jan 2010
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    I would not want to learn a Voyager on my own even with a forum to turn to.

  11. #11
    Join Date
    Nov 2006
    Location
    Southeastern Pa
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    With the proliferation of personal digital devices, I am surprised that we have not yet heard back from the OP.....
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist
    Member, IAEI

    AOP Forum Rules:







  12. #12
    Join Date
    Mar 2008
    Location
    kansas
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    Quote Originally Posted by lzenglish View Post
    Check for 24 volts at the thermostat. If you have 24 volts, replace the stat. If you do not have 24 volts, go to the transformer and check for 24 volts output. If you have 24 volts output, you have an open stat wire. Either replace, and or wire around it. If you do not have 24 volts, check the primary line voltage to the transformer. If you have line voltage, you have a bad transformer, replace it.
    Not to sound like a d*ck but have you even seen a voyager series Trane? Because your way off base
    Honeywell you can buy better but you cant pay more

    I told my wife when i die to sell my fishing stuff for what its worth not what i told her i paid for it

  13. #13
    Join Date
    Apr 2010
    Location
    California
    Posts
    660
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    Quote Originally Posted by crazzycajun View Post
    Not to sound like a d*ck but have you even seen a voyager series Trane? Because your way off base
    Yes i have seen, and worked on them. When i realized what the OP had, i tried to delete my advice, but it would not let me. I was thinking old school before microprocessors, my bad.

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