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  1. #1

    Dual 4 ton txv's on 7.5 ton coil- 1 icing, the other seems normal

    I have something i have not seen before. carrier 7.5 ton r-22 evap with 2 four ton txvs. One is icing at the manifold and the other is not. I replaced the icing valve and got same results. Anyone seen this before? Thanks. 5/8 liquid line splits into 2 1/2 inch lines, go into seperate txv and suction lines join at outlet of air handler to return to condenser in 1 1/8 line.

  2. #2
    Join Date
    Jan 2009
    Salisbury, Maryland
    Got any other data? OD temp, superheat, subcooling, pressures?

  3. #3
    Join Date
    Jan 2008
    Dallas ,Texas
    Maybe even equipment model #'s too. So we can get an idea of what you are working with.

  4. #4
    Sorry, Carrier 40rm012 air handler, 7.5 ton trane condenser, 85 oda 250 head/50 back 23 delta t on saturday, yesterday told it was 85oda, 30 back 210 head and 15 delta. Upper txv circuit icing. lower not.

  5. #5
    Join Date
    Nov 2009
    Central Virginia
    85 outdoor air and are you saying you had a 50psi suction pressure? Just wanna be sure Im reading that right.

    Sent from my SPH-D710 using Tapatalk 2
    If you don't know what you are doing.... ASK!! There is no such thing as a "Stupid" question.... Maybe.

  6. #6
    yes, 50 suction and 250 at liquid service port.

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