High suction, low discharge

[michigan1]

So I just installed a complete Rheem 5 ton, 14ajm series system ast november. HO tells me its not cooling as good. I arrive to find a loud compressor, 200 psi suction and 275 head. First thing that comes to mind is bad valves. A few minutes later the compressor cuts off on internal overload. I take a hose and cool it off. 10 min later, compressor kicks back on and pressures now seem normal (130/325) 13 subcool , 19 delta t. So I let it run for 20 minutes and take off. An hour later , HO called back and outdoor unit has stoppes running again. Bad txv?

[Six]

Why would you leave with a compressor running 225/200 without resolving the issue ?

Of course its going to trip again.

[lolson]

Overfeed. possible loose bulb or poorly insulated, over sized.
Suction pressure high, head pressure low, superheat low, subcooling low, amp low.
I don't see any superheat or subcooling

[michigan1]

Why would you leave with a compressor running 225/200 without resolving the issue ?

Of course its going to trip again.

I was planning on going back to replace the txv. Just wanted some feedback

[GrumpyPawPaw]

Is the suction line very cold? If not I would suspect the internal releif valve in the compressor.

[GrumpyPawPaw]

My above question applies when the unit is malfunctioning. I'm assuming the condenser fan was running? Condenser fan shutting off, when your not there? Check fan amps and the cap.

[Six]

I was planning on going back to replace the txv. Just wanted some feedback

Ah...ok.

Well someone mentioned a week internal relief that sounds reasonable.

Even if your txv was wide open you wouldnt be equalizing like that.

It almost sounds like its a scroll running backwards.

[cboe]

bad valves or internal releaf open

[GrumpyPawPaw]

If bad valves, it wouldn't have returned to normal pressures.

[michigan1]

If bad valves, it wouldn't have returned to normal pressures.

Exactly

[michigan1]

Is the suction line very cold? If not I would suspect the internal releif valve in the compressor.

Ok this makes sense. IRV pops, compressor gets hot, then goes off on internal overload? Ive never had one do that but logical...

[SoFlaDave]

Sounds like a scroll running backwards to me as well. I was working on unit the other day and we had a little power brown out and the neighbors rheem unit started running backwards. I reset the breaker and it started up fine. Maybe they have a bad connection or floatswitch that is causing the unit to short cycle. Install a time delay and check your wiring inside and and out.

[michigan1]

Sounds like a scroll running backwards to me as well. I was working on unit the other day and we had a little power brown out and the neighbors rheem unit started running backwards. I reset the breaker and it started up fine. Maybe they have a bad connection or floatswitch that is causing the unit to short cycle. Install a time delay and check your wiring inside and and out.

Its single phase. You mean its running backwards on overload?