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Thread: TXV issue?

  1. #27
    Join Date
    Oct 2010
    Location
    Anderson, South Carolina, United States
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    7,446
    Is it a mobile home unit or a standard unit ducted into the mobile home ductwork?

  2. #28
    Join Date
    Jan 2006
    Location
    McQueeney, Texas
    Posts
    3,937
    The head psi problem went right over my head.

    I'm betting it was the low psi switch too.

    The gauges tell a lot.

  3. #29
    It is a mobile home furnace in a mobile home. Coil cabinet at bottom of furnace

  4. #30
    Thanks for all of your replies. Turns out it was the bulb upside down. After I turned it over it has been working fine for five days and counting! Hope this experience helps someone else too.

  5. #31
    Well, I thought turning the bulb over fixed it. Now it's 7 days later and the customer called back saying the coil iced up again. This is the first time in 7 days. He said the outdoor temp was 71 and they were trying to pull the house temp down to 69. The coil iced up and condenser unit tripped out. Probably low pressure switch. If it's the txv valve why is it doing this sporadically? If it's the air flow across the coil- why is it doing this sporadically? It is a new r-410a straight cooling system with a mortex evap coil and rheem classic condenser. Could the blower motor be failing? The supply ducting in the crawlspace also has air leaks all over but the old system operated under these same conditions and didn't ice up. New unit is same size as old unit. Any ideas?

  6. #32
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,311
    When you checked it the first time. What was the suction saturation temp?
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  7. #33
    Join Date
    Jul 2009
    Location
    South Carolina
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    3,260
    We still don't know what the pressure readings were at any point. Everything points to low airflow so that's why pressure & temp readings would help. A faulty TXV is always suspect nowadays since they're so common too. If the airflow is O.K. & pressures & temps are O.K. then two other possible things could be the blower motor cutting out(circuit board , relay, motor, even loose wire) or the outside contactor is sticking intermittently.
    Gary
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  8. #34
    Join Date
    Aug 2008
    Location
    San Clemente, CA
    Posts
    1,224
    Need to check furnace to see if blower is rated for a/c tonage? Sometimes the furnace blower has to be changed out to a larger assembly for proper air flow. Jumper duct under coach needs to be installed and connected. Check air flow from all s/a registers.

    Post size of system, model numbers of equipment both indoor and out. Model number of indoor coil. And as asked is this a downflow system or upflow?

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  9. #35
    Down flow. I only have temp and pressure readings from when the system was functioning properly. I will get the equipment info and post tomorrow.

  10. #36
    Join Date
    Sep 2012
    Location
    New York
    Posts
    175
    I agree i would check your airflow, also inspect the blower wheel, ive seen it where the blower wheel is caked up with junk that it doesn't move enough air across the coil. Inspect the coil too there is a chance its covered in junk too. Are we overlooking the possibility of low airflow and low charge possible? What are the pressures when the system is "working fine"?

  11. #37
    I don't remember my pressures but I'm thinking 243 high side and over 100 on low side but I'm not exactly sure it was last Friday that I did it.

  12. #38
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,758
    Quote Originally Posted by bjonesplumb View Post
    To get back to the beginning, are we all in agreement that this ice up issue could be caused by the txv bulb being mounted upside down?

    Over the years, I have seen and have installed TEV bulbs in some difficult locations without regard for location of the capillary tubing.

    I can't say that I have ever been able to track a problem, icing or otherwise down to simply bulb positioning or orientation.

    Ehh. Maybe floodback to a few broken bulb straps, but that's understandable and logical.

  13. #39
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,311
    So maybe 103PSIG which is 33°F for R410A. Just barely above freezing. Good chance its a low air flow issue.
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