|
Posted by on May 15, 2008, 2:50 pm
>
> On May 15, 10:49 am, .p.jm@see_my_sig_for_address.com wrote:
>
>
>
>
>
> > >richard...@yahoo.com wrote:
> > >> Most of my work has been new construction and very little service tec=
h
> > >> so forgive me if this is too simple. My ex-wife called me a few days
> > >> ago and said her heat pump wasn't cooling. She said someone replaced
> > >> the compressor, which made it much better, but it's still not cooling=
> > >> like it should. So I thought that unless I want to give her even more=
> > >> of my hard earned money, I better load up the truck and head over.
>
> > >> Here's what I found. It's a 3 ton 10 seer HEIL split system heat pump=
> > >> with a TXV. New copeland recip compressor and new dual cap. Coils
> > >> are clean, filter is clean. I put the guages on and that's when I got=
> > >> a little confused.
>
> > >> outside air temp - 81
> > >> inside air temp =3D 78
> > >> Outdoor humidity: ~70%
>
> > >> Suc Pressure - 64
> > >> Suc temp - 80
>
> > >> Liq Pressure - 200
> > >> Liq temp - 87
>
> > >> Condenser TD - 13
> > >> Evaporator TD - 14
>
> > >> My handy Trane charging chart shows it being slightly overcharged....=
> > >> but shouldn't be enough to give me such a low TD across the evap.
> > >> Rather than just start fiddling with the charge I thought I might wan=
t
> > >> to actually try to figure out what's wrong with it.
>
> > >> The only other thing out of the ordinary is the condenser fan was
> > >> replaced with one that's 75 rpm faster. It calls for a 1075 rpm and
> > >> has a 1150. In my brief experience I believe that won't have a big
> > >> effect.
>
> > >> any ideas?
>
> > >I'm thinking your TXV isn't opening enough to fill the coil completely
> > >with
> > >refrigerant, hence a low TD across the evaporator with a high
> > >superheat....
> > >[low performance.]
>
> > >All other signs seem normal, except that since the evaporator isn't
> > >getting
> > >enough refrigerant, I'd see a low head pressure because the system isn'=
t
> > >picking up enough heat......
>
> > >Thinking about Noon-air's recommendation, I'd likely go his route but
> > >install a new TXV while I'm there cleaning / checking the screen before=
> > >the
> > >valve.
>
> > Check that the bulb is properly mounted and insulated.
>
> > --
> > Click here every day to feed an animal that needs you today
> > !!!www.theanimalrescuesite.com/
>
> > Paul ( pjm @ pobox . com ) - remove spaces to email me
> > 'Some days, it's just not worth chewing through the restraints.'
> > 'With sufficient thrust, pigs fly just fine.'
> > HVAC/R program for Palm PDA's
> > Free demo online atwww.pmilligan.net/palm/
> > Free 'People finder' program now atwww.pmilligan.net/finder.htm-Hide
> > quoted text -
>
> > - Show quoted text -
>
> That brings up a good question. =A0Some of the guys I work with insist
> on mounting it on a horizontal line, offset 45 degrees, and downstream
> of the pressure tap.... unless the manufacturer specifies otherwise.
> Others mount it vertically upstream and say there's no difference. =A0I
> side with the first group. =A0I cleaned and re-insulated/taped the bulb.
>
> comments?
>
> Yeah, Why didn't you answer my questions?- Hide quoted text -
>
> - Show quoted text -
Didn't see your post. You clearly don't know anything about Texas
divorce law. The law is.... she gets everything. But that's a
different story for a different group.
How long is the lineset and where is its location? Lineset about
40'. As far as location... I'm not sure what you're asking. I'm not
trying to be smart but the only way I know to answer that is, it's in
the attic and in the wall between the evap and condenser.
Have you checked for proper indoor fan speed? Yes, it's fine. I was
always taught to check that and clean it.
The system is NOT overcharged or you would have a higher Subcooling
reading.
| 
Yahoo! 
Google 
Windows Live 
del.icio.us 
digg 
Netscape 
XML Sitemap