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Posted by new jersey on June 6, 2008, 9:40 pm
>I just came back from my neighbors unit, its a 14 SEER Rheem R22 split HP.
> We walk our dogs together so he asked me if I could look at it tomorrow.
> He said it wasn't cooling when he got home yesterday so he shut off
> all night. I went & get my tools & checked it for him today. Water had
> been
> coming out of his secondary overflow at the eave so I figured it was
> probably the attic float switch. I used a wet vac on the secondary &
> primary & the system started up O.K. Here's where things get screwy.
> I checked the pressures & the system has fixed 25-30 degree
> superheat(TXV) on the plate.
> According to the chart the head pressures were right on
> the money.
> SP - 55 psi
> HP - 225 psi
> SH - 27 deg.
> SC - 20 deg.
> 86 DB outside temp
> 80 DB inside temp
>
> Temp across indoor coil 12 deg.
>
> I originally thought the charge was low but I always check the unit specs
> when available first.
> Any other unit I would say would have a restriction
> with high SH & SC but I've never seen a TXV that calls for such high SH.
> It doesn't even have a subcooling reference at all.
> Its pouring water out of the drain so its obviously doing some
> dehumidifying. I'm going back to check in the morning when I'll actually
> feel like working but curious if any one familiar with Rheem has ever run
> into this funky TXV 25-30 deg. SH spec. on a residential unit.
As I said before system is undercharge not much but undercharge.
There also could be which you guys perhaps never in counter before
and that is liquid flash off in liquid line which would be very rare
condition
on AC systems, this condition will act same as unit being undercharge.
As stated that unit started to work on it's own that is exact what unit will
do
I made comments to check system when it get little warmer and sooner it
get warmer unit will start to work like no problem ever existed.
Tony
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