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410 help needed!

Timco
Timco Member Posts: 3,040
in A-C, Heat Pumps & Refrigeration
Helping a friend diagnose 410 system but I've only done one.



Suction temp 68*, 78* day, liquid pressure 230, suction pressure 115, and top of coil is 68* or so and bottom of coil is 45*. Lots of air flow. TXV installed but non adjustable. Small Rheem system. Have not looked up the size but maybe 1.5 ton. Small.
Just a guy running some pipes.

Comments

  • Timco
    Timco Member Posts: 3,040
    Coil

    Liquid side of A coil sweats bad. Top clean.
    Just a guy running some pipes.
  • JStar
    JStar Member Posts: 2,752
    410

    Sounds undercharged. The liquid line is at saturation temperature. Superheat of 30 possibly too high.



    What was the indoor wet bulb?
  • Timco
    Timco Member Posts: 3,040
    Wet bulb

    67* in house.



    My liquid line was 300 psi. Coil sweats super bad.



    82* and 35% in the house. Bottom of coil super cold. Top hot.
    Just a guy running some pipes.
  • JStar
    JStar Member Posts: 2,752
    AC

    Undercharged. Low side pressure should be closer to 160 with about 20F superheat. Subcooling should be per manufacturer's guidelines or 8-15.
  • John Mills_5
    John Mills_5 Member Posts: 952
    Rheem chart

    1.5 ton ton 13 SEER chart with matching N coil...



    At 80 out, heat would run from 270 to 324, low side 105 to 165. Without knowing the load, no way to guess where in that range it would be. Usually with the house comfy, probably closer to 290 head, 140 suction. Like JStar said, 20 superheat really common out of a Rheem TXV setup, the RANL-018 calls for 11 subcool. By comparison, the cheapo cube calls for 7 subcool so look at the chart that came with the outdoor unit.
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