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  1. 01-25-2013, 08:31 AM #1
    vahe501
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    Trane RTU IDFM keeps running?

    Morning guys, Trane package unit had me scratching my head.
    Trane 3ton RTU YCD036C4LOBE manufactured 1/2001

    Symptoms: IDFM keeps running, T-stat NOT calling for heat/cooling/fan

    Trouble shoot: Identical unit on the roof so I swapped out t-stat, control module, ignition module, inclosed IDFM contacter, removed spade connector to the high limit inside the heat exchanger and IDFM compartment.

    Any Ideas?
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  2. 01-25-2013, 09:29 AM #2
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    2sac
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    Common problem. Windings are shorted.
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  3. 01-25-2013, 09:41 AM #3
    vahe501
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    really??? when the IDFM contactor is de-energized by manually removing 24v leg, motor stops running.
    In other words IDFM contactor is constantly energized.
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  4. 01-25-2013, 09:42 AM #4
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    timebuilder
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    Get pro status and ask in Pro Commercial. We can tell you all about it.
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  5. 01-25-2013, 09:44 AM #5
    vahe501
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    Trying to get there, few more posts to go.
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  6. 01-25-2013, 02:20 PM #6
    TheDecline
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    Well the contactor can only be energized from a few sources. Either the secondary limit (TCO2) is energizing it; in which case the switch is either overheated or stuck; or the economiser is calling for fan for some reason, or the fan delay relay is stuck or incorrectly energized. I would bypass the economizer to rule it out and then see where your IDF contactor is getting energized from by checking for voltage through your TCO2 and FDR from terminals 1 and 2.
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  7. 01-25-2013, 04:13 PM #7
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    Quote Originally Posted by TheDecline View Post
    Well the contactor can only be energized from a few sources. Either the secondary limit (TCO2) is energizing it; in which case the switch is either overheated or stuck; or the economiser is calling for fan for some reason, or the fan delay relay is stuck or incorrectly energized. I would bypass the economizer to rule it out and then see where your IDF contactor is getting energized from by checking for voltage through your TCO2 and FDR from terminals 1 and 2.
    That's not the issue, but I don't discuss the tech stuff in the open forums.
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  8. 01-25-2013, 04:37 PM #8
    vahe501
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    Will try that and get back to you guys
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  9. 01-25-2013, 04:41 PM #9
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    IDF is indoor fan or induced draft fan???
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  10. 01-25-2013, 04:52 PM #10
    vahe501
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    Idfm, indoor fan motor
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  11. 01-25-2013, 05:23 PM #11
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    Well my bad then. I thought that stood for induced draft fan motor in your post.
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  12. 01-25-2013, 05:52 PM #12
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    Mine too.
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  13. 01-25-2013, 08:01 PM #13
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    is it on EMS?
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