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  1. 03-20-2013, 07:18 PM #1
    Trubbler
    Trubbler is offline Regular Guest
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    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.
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  2. 03-20-2013, 07:45 PM #2
    ClimateCntlJohn
    ClimateCntlJohn is offline Professional Member
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    Got any other data? OD temp, superheat, subcooling, pressures?
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  3. 03-20-2013, 07:48 PM #3
    Dallas Duster
    Dallas Duster is offline Professional Member*
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    Maybe even equipment model #'s too. So we can get an idea of what you are working with.
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  4. 03-20-2013, 08:13 PM #4
    Trubbler
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    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.
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  5. 03-20-2013, 08:21 PM #5
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    bullmoose
    bullmoose is offline Professional Member*
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    85 outdoor air and are you saying you had a 50psi suction pressure? Just wanna be sure Im reading that right.

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  6. 03-20-2013, 08:25 PM #6
    Trubbler
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    yes, 50 suction and 250 at liquid service port.
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