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    Freeday's Avatar
    Freeday Posts: 6, Reputation: 1
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    #1

    Apr 15, 2010, 12:05 PM
    Heat pump condenser (outdoor unit) married to a gas furnace
    [I] have a Heat pump with A/c. We are changing the indoor air handler to a gas unit. Can the outdoor condensing unit be used with a new coil in this system?
    Joshdta's Avatar
    Joshdta Posts: 2,549, Reputation: 45
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    #2

    Apr 15, 2010, 12:14 PM

    Yes it should be able too. Why are you changing coils?
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    Freeday Posts: 6, Reputation: 1
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    #3

    Apr 15, 2010, 02:59 PM

    The coil on the original indoor piece is 25 years old, gigantic,and does not match the new furnace.
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    Joshdta Posts: 2,549, Reputation: 45
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    #4

    Apr 15, 2010, 04:33 PM

    Ah, OK. I would recommend you get a txv valve for your new coil. And get the exact match do not get a half size bigger. What size is your heat pump?
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    Freeday Posts: 6, Reputation: 1
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    #5

    Apr 15, 2010, 04:38 PM

    Josh, Thanks for the feedback. We got the system charged (no txv) and are getting a very high pressure on the liquid line. Would the lack of a txv cause this? I also read that the heat pump condensing units have back check or one way direction valves. What are we missing?
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    Joshdta Posts: 2,549, Reputation: 45
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    #6

    Apr 15, 2010, 04:40 PM

    What size coil did you install? Tonnage? And what size heatpump do you have? Did you change the piston in the coil or use the one that came with the coil?
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    Freeday Posts: 6, Reputation: 1
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    #7

    Apr 15, 2010, 04:41 PM

    I am told the serial number states the size of the unit. To the best of my knowledge it is a 3.5 ton.
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    Joshdta Posts: 2,549, Reputation: 45
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    #8

    Apr 15, 2010, 04:44 PM

    OK, is the new coil a 3.5 or a 4 ton? Was this unit charged in the heating mode or the ac mode? What was the suction and head presures you are getting?
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    Freeday Posts: 6, Reputation: 1
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    #9

    Apr 15, 2010, 04:44 PM

    We did not change anything in the coil.
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    Freeday Posts: 6, Reputation: 1
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    #10

    Apr 15, 2010, 04:47 PM

    4 ton coil. Charged in idle. Head pressure 75# and suction pressure pegged.
    Joshdta's Avatar
    Joshdta Posts: 2,549, Reputation: 45
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    #11

    Apr 15, 2010, 04:52 PM

    Outdoor fan is running normal? Did you try to turn it to heat and see what liquid pressure you were getting? 75 on the suction sound high also may be over charged how hot was it where you are today?

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