[DougEFresh]

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]

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]

At those pressures, its not a reversing valve problem.

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

 

[Hubcap626]

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

 

[DougEFresh]

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]

It isn't the RV.

You have a restriction elsewhere.

 

[DougEFresh]

Thanks, I'll look deeper into it.

 

[plangill]

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]

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