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-   -   Low suction/low head pressures (http://www.diychatroom.com/f17/low-suction-low-head-pressures-104954/)

DougEFresh 05-19-2011 01:26 PM

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

hvactech126 05-19-2011 04:04 PM

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?

beenthere 05-19-2011 04:35 PM

At those pressures, its not a reversing valve problem.

Switch it to heat mode, I bet the head pressure sky rockets.

Hubcap626 05-19-2011 08:06 PM

Is that your discharge or liquid you are reading? The 110

DougEFresh 05-19-2011 08:26 PM

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.

beenthere 05-19-2011 08:32 PM

It isn't the RV.

You have a restriction elsewhere.

DougEFresh 05-19-2011 08:50 PM

Thanks, I'll look deeper into it.

plangill 11-15-2012 04:26 PM

Refrigerant restriction
 
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?

plangill 11-15-2012 04:29 PM

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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