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  1. #1
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    Mar 2018
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    Trane Rooftop unit

    Trying to see why trane would put like this or if im missing something.
    Trane MN TEF420B4BH0B1BC1A000000H0000000
    This unit has three condenser fan motors. Two of the fans have louvers on top, the third fan does not. My thinking is that the fan without the louvers would be the first fan to start as they stage up with demand as the louvers would prevent air bypassing the coil. and after watching unit during start up I found the louver fans started first. I verified wire numbers to wiring diagram to see if someone had miss wired during repairs and all wire numbers matched with diagram. so long story short has anyone else seen this and/or can anyone tell me why this would be correct. once again thanks for time and knowledge.

  2. #2
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    Jul 2018
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    The dampers should modulate

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  3. #3
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    Mar 2018
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    Florida
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    Thread Starter
    they are not mechanical but just sit to were if fan is running the air will push them open and if that fan is not running and say another fan is running the louvers will rest closed preventing the air from pulling in thru the fan cavity thus bypassing the condenser coil.

    so to me they should be last to start but they were first to start.

  4. #4
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    Jul 2018
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    Wisconsin
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    Never seen that. Maybe a anti-windmill as your thinking. I've seen a few of the mechanical damper for Head pressure control. Maybe someone else will know. Do you have a picture?

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  5. #5
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    Sep 2007
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    edmonds wa
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    I am thinking along your way it should operate, it would need some type of NO liquid line switch on each circuit to stage it that way i would think. What turns on the non louvered fan now?
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  6. #6
    Join Date
    Feb 2010
    Location
    montreal
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    It's for head pressure control. Instead of cycling the fan, you reduce airflow.
    When head pressure raise you open the damper.
    If it drop damper close

  7. #7
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    Nov 2011
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    Are you sure that model number is correct? I can't find any trane literature that lists a TEF.

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  9. #8
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    Feb 2017
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    New York
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    Is there a small box off to the side where an actuator is hiding?

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  10. #9
    Join Date
    Nov 2006
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    Southeastern Pa
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    The intellipaks use dampers on the condenser fans with an actuator..... but the ones I've looked at are probably close to 20 years old ....so I'm not sure if they're still doing that.
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  11. #10
    Join Date
    Jan 2010
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    Quote Originally Posted by 71CHOPS View Post
    Are you sure that model number is correct? I can't find any trane literature that lists a TEF.

  12. #11
    Join Date
    Jul 2007
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    Quote Originally Posted by 71CHOPS View Post
    Are you sure that model number is correct? I can't find any trane literature that lists a TEF.
    Quote Originally Posted by VTP99 View Post
    It exists. I have the Parts List and IOM, but neither show, or discuss, the louvers on the condenser fans the OP is talking about.
    Instead of learning the tricks of the trade, learn the trade.

  13. #12
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    Jan 2010
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    Is it some special package unit ?

  14. #13
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    Jul 2007
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    Quote Originally Posted by VTP99 View Post
    Is it some special package unit ?
    Yes, one of those "Big as a House" package units - see attachment.
    Attached Images Attached Images
    Instead of learning the tricks of the trade, learn the trade.

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