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Thread: Mitsubishi lineset sweating in bedroom

  1. #21
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    Jan 2008
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    Other will disagree with my basic check out procedures but, with a multiple zone unit I turn all units to max cooling and high fan.
    Look at all of the lines at the condenser, both lines should be cold and sweating because the EXV is in the condenser.
    If all lines are cold there is no need to normally attach gauges because the is no exact way to check charge short of weighing it back in.
    This is just a quick way to check the charge condition of the unit. Follow what Jacob is saying to verify that the interconnect wiring is landed properly.
    These are some of the possible reasons for freezing lines.

    Sent from my ASUS_P00J using Tapatalk

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  3. #22
    Join Date
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    Wow hope you can access that from the front panel.

  4. #23
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    Sep 2002
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    Thread Starter
    Quote Originally Posted by VTP99 View Post
    I could see that happening if whoever ran the control wiring didn't identify them or check upon start-up.
    Wouldn't the other unit create the same problem unless the line length was short.
    Mmmmm Hmmmm good question

  5. #24
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    Thread Starter
    Quote Originally Posted by chander View Post
    Are both lines sweating?
    honestly I didnt pay that close attention because I didnt know both lines got cold until you mentioned the valve was in the OD unit

  6. #25
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    I'm thinking a automatic expansion valve to control capacity.

  7. #26
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    Dec 2005
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    Quote Originally Posted by Snapperhead View Post
    Mmmmm Hmmmm good question
    Depends on if the unit is off or not.

    Alot of times it happens to unit that they turn to off.

    If you just have it in cool and walk away, the blower is always spinning. It just kinda causes it to overshoot the room.

    Best way to describe figuring out if you have crossed heads, is treat that multi head if it were just 4 condensers.

    Turn all off, turn one on at a time and make sure the right one gets cold.
    Don't trust noise, because on startup you eevs are still spinning down.

    If your insulation is sweating through BOTH lines, your not moving enough air.
    Your eev can only bog so far down.
    Alot of these units run a straight 0 to 2 superheat, and then separate liquid in the receiver.

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  9. #27
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    Sep 2002
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    Thread Starter
    Ok so its been a few days and the only thing I did was remove the fancy covering

    No more sweating since ....

  10. #28
    Join Date
    Aug 2002
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    Quote Originally Posted by Snapperhead View Post
    Ok so its been a few days and the only thing I did was remove the fancy covering

    No more sweating since ....
    You effectively raised the Dew Point!

    Warm moist air is getting in there from the outside penetration.

    Once armor flex gets wet its shot and must be replaced!

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