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Old 05-19-2011, 01:26 PM   #1
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Low suction/low head pressures


Hi,
I'm having problems with a 3t HP. My suction is running at 45psi and head is at 110psi. I checked evap coil and filter and both were clean, so I figured it was low on R22. I added 7 lbs. (factory charge is 7.25 lbs) and pressures did not change. The suction line is frosting up to the compressor. I'm starting to think I have a bad reversing valve. Any help will be great. Thanks

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Old 05-19-2011, 04:04 PM   #2
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Low suction/low head pressures


have your tried switching the reversing valve to see if it switches? what are your temps entering and leaving the reversing valve? Where are you hooking your gauges up at?

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Old 05-19-2011, 04:35 PM   #3
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Low suction/low head pressures


At those pressures, its not a reversing valve problem.

Switch it to heat mode, I bet the head pressure sky rockets.
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Old 05-19-2011, 08:06 PM   #4
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Low suction/low head pressures


Is that your discharge or liquid you are reading? The 110
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Old 05-19-2011, 08:26 PM   #5
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Low suction/low head pressures


Yes I powered the reversing valve 3 or 4 times, thouht it would loosen up if it was stuck part way, and yes the head pressure went up. The 110 psi was on the discharge side.
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Old 05-19-2011, 08:32 PM   #6
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Low suction/low head pressures


It isn't the RV.

You have a restriction elsewhere.
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Old 05-19-2011, 08:50 PM   #7
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Low suction/low head pressures


Thanks, I'll look deeper into it.
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Old 11-15-2012, 04:26 PM   #8
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Low suction/low head pressures


beenthere: Where would I find the restriction, most likely? I have a HP with same problem as the other guy. I took the piston metering device off and it looks good. Shouldn't I have another metering device? Would it be at the evap, connected to the dist tubes?
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Old 11-15-2012, 04:29 PM   #9
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Low suction/low head pressures


I also had the same prob on another unit and the TXV powerhead lost charge. Replaced and fine. This unit has no TXV.

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