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Posted by Noon-Air on June 1, 2008, 9:59 pm
>>
>> I need model and serial numbers.
>>
>>> According to the chart the head pressures were right on
>>> the money.
ummm...no.
>>> SP - 55 psi
>>> HP - 225 psi
>>> SH - 27 deg.
>>> SC - 20 deg.
>>> 86 DB outside temp
>>
>>
>> Something is not right.. need model and serial numbers.
>>
>>> 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.
>>
>> What are the model numbers for the heat pump and the air handler? The
>> coil
>> model number would be good too.
>>
>> As a rule, with Rheem stuff, you want 10 - 14 degrees of subcooling.
>>
>> My first impression is that its overcharged....and there may be an
>> airflow
>> restriction to complicate matters, and until I know what the model
>> numbers
>> are, I really can't tell you much else.
>
> Outside Model # RPNJ031JAZ
> I'll probably get the indoor model numbers tomorrow.
> I was in shorts & sandals & not about to go into the attic today.
> I just came back from walking my dog again & he said everything was
> working great. It's cold as ice in the house & it got to 90 degrees
> outside after I left.
> I might try another set of gauges tommorrow just to be sure but it has
> specific charging instructions on the unit inside cover. They say that the
> TXV used for cooling is non adjustible with a fixed 25 to 30 degree SH.
The correct TXV is non adjustable, and when properly installed, maintains
15 - 20 degree SH
> It doesn't have any subcooling specs but it gives specific head pressure
> readings under outside ambient conditions. The SH just doesn't make sense.
> My Suction line temp was 57 & air coming out was 68 which seems about
> right. According to what's written on the unit I'd need to have about
> 47 psi on the suction line to get a good temp drop across the coil.
> Most Rheems that I've worked on have a little higher than normal suction
> pressures because they run well over 400 cfm's per ton.
> Maybe this was one of Rheems experimental units.
> I can't find it listed in ARI at all.
Because its obsolete.
The RPNJ model was only made for about 5 years. It should be matched with an
RBHK-21 air handler (with ECM blower motor), and RCHJ-36A1 Multiflex coil.
According to the charging chart, at 80 degrees, your LLP should be right at
205psi with a 10 - 14 degree subcooling. Your SP is too low, your SH is too
high... is there a kink in the LL anywhere?? or dirty TXV screen, or did
somebody not properly install the TXV in the first place. When the TXV is
installed on those, the piston is changed to .120 along with installing the
TXV.(unless the coil/TXV were factory assembled). Just for grinns, when the
heat pump was installed, did the installer put in a filter/frier?? or did
the unit come with one internally??
I just had a thought(No, paul, it didn't hurt)... the problem with this
system...is constant?? or does it come and go??
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