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TX valve with Amana/Goodman heat pump and ARI ratings

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TX valve with Amana/Goodman heat pump and ARI ratings spearingusenet 08-19-2006
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Posted by Murdentech on August 20, 2006, 12:24 pm

> On Sat, 19 Aug 2006 09:28:25 -0400, "Murdentech" <j. murden@ insight
> bb.com> wrote:
>
> Jeff,
> Just curious. I havent seen the problem with a TXV being more
> difficult to adjust the charge?in fact, seems a lot easier. Quite
> frankly, with 13 SEER here now, I think the piston flow rater crap
> needs to disappear. What problems have you found with adjusting the
> charge on a TXV?
> Bubba :-)

I should have said... can be more difficult to diagnose a charge / low
charge condition.... We were on a job where the house would not dehumidify
adequately and it seemed the TXV was not responding properly. Pressures were
fine but the coil would not sufficiently flood. The house would cool fine,
but the darn unit just wouldn't pull the humidity. Finally took the bulb
loose, did the ice water / hot water trick and let it hang. After that the
coil flooded nicely and was nice and cold all the way across.

Had another job on a 7.5 ton commercial heat pump, where the little pinion
rods in the valve were stuck solid at the indoor coil.... took the TXV apart
and had to pull the rods out with a channel lock... replaced the TXV head
and rods and the unit ran like "40 going north".... that unit had a previous
compressor replacement and some other hack work done to it over the years.

I hate following up someone else's sloppy work !!
I have enough of a time fixing my own messes ;-)






AppliancePartsPros.com, Inc.
Posted by on August 19, 2006, 9:35 am
spearingusenet@gmail.com wrote:

>I am going to be ripping out my oil furnace and installing a heat pump
>and am about to pull the trigger on an Amana (Goodman) 3.5 ton and
>variable speed AHU. From what I can tell, they come with a flowrater
>instead of a TX valve. Three items I hope someone can help with:
>
>1. Can someone confirm that the "flowrater" is not a TX valve and is
>just an orifice arrangement in place of the TX valve? What do they do?
>
>2. A majority of the Amana ARI ratings say " + TXV " in the AHU
>column. I assume this means that a TX valve was installed in the AHU
>for the test. Why would they do this when the standard unit comes with
>a "flowrater"? Will it improve both heating and cooling performance?
>
>3. If I go with a unit with a factory flowrater, should I insist that
>they install a TX? I would use the unit 93% of the time for heat.
>What does the TX improve and how? Any downsides to a TX (moving parts,
>longevity, etc.)?
>
>Thanks for any help!
>
>S

Insist on an evaporator coil with a factory installed txv, and NOT
the flowrater crap. Then insist on ARI certified matched coils.
Who's money are we spending anyway?

Posted by udarrell on August 19, 2006, 1:19 pm
gofish@gonefishin.net wrote:

> spearingusenet@gmail.com wrote:
>
>
>
>>I am going to be ripping out my "oil furnace" and installing a heat pump
>>and am about to pull the trigger on an Amana (Goodman) 3.5 ton and
>>variable speed AHU. From what I can tell, they come with a flowrater
>>instead of a TX valve.
>>3. I would use the unit 93% of the time for heat.
>>
Where do you live? Sounds like you need a furnace, not just a heatpump.

>Insist on an evaporator coil with a "factory installed txv," and NOT
>the flowrater crap. Then insist on ARI certified matched coils.
>Who's money are we spending anyway?
>
>
If it gets cold at night & you use the A/C the that day, then it needs a
crankcase heater on the compressor!
In cooler climates for many reasons, a TXV is a must! Read & learn.

Oil furnaces can result in airflow problems with the addition of A/C or
heatpumps.
http://www.udarrell.com/oil_furnace_heating.html

http://www.udarrell.com/oil_furnace_heat_exchanger.html


--
Air Conditioning's Affordable Path to the "Human Comfort Zone Goal"
http://www.udarrell.com/air-conditioning-total-heat-enthalpy-latent-heat.html
HVAC Techs:
http://www.udarrell.com/ac-trouble-shooting-superheat-subcooling.html

Posted by udarrell on August 19, 2006, 1:49 pm
gofish@gonefishin.net wrote:

> spearingusenet@gmail.com wrote:
>
>
>
>>I am going to be ripping out my "oil furnace" and installing a heat pump
>>and am about to pull the trigger on an Amana (Goodman) 3.5 ton and
>>variable speed AHU. From what I can tell, they come with a flowrater
>>instead of a TX valve.
>>3. I would use the unit 93% of the time for heat.
>>
Where do you live? Sounds like you need a furnace, not just a heatpump.

>Insist on an evaporator coil with a "factory installed txv," and NOT
>the flowrater crap. Then insist on ARI certified matched coils.
>Who's money are we spending anyway?
>
>
If it gets cold at night & you use the A/C the that day, then it needs a
crankcase heater on the compressor!
In cooler climates for many reasons, a TXV is a must! Read & learn.

Oil furnaces can result in airflow problems with the addition of A/C or
heatpumps.

http://www.udarrell.com/oil_furnace_heating.html

http://www.udarrell.com/oil_furnace_heat_exchanger.html

- udarrell
--
Air Conditioning's Affordable Path to the "Human Comfort Zone Goal"
http://www.udarrell.com/air-conditioning-total-heat-enthalpy-latent-heat.html
HVAC Techs:
http://www.udarrell.com/ac-trouble-shooting-superheat-subcooling.html

Posted by on August 19, 2006, 11:33 pm
udarrell wrote:
> gofish@gonefishin.net wrote:
>
> > spearingusenet@gmail.com wrote:
> >
> >
> >
> >>I am going to be ripping out my "oil furnace" and installing a heat pump
> >>and am about to pull the trigger on an Amana (Goodman) 3.5 ton and
> >>variable speed AHU. From what I can tell, they come with a flowrater
> >>instead of a TX valve.
> >>3. I would use the unit 93% of the time for heat.
> >>
> Where do you live? Sounds like you need a furnace, not just a heatpump.

I live on southern Vancouver island and there are very few days below
zero here. Our house is close to the ocean (~300 ft) which further
moderates temperatures on colder days and lots of nice breezes to cool
the house. The third reason that I am not putting the furnace in is
that we have an air tight wood stove that we like to use. We really
like the heat it gives off.

>
> >Insist on an evaporator coil with a "factory installed txv," and NOT
> >the flowrater crap. Then insist on ARI certified matched coils.
> >Who's money are we spending anyway?

Does anyone know if any of or which of the Amana or Goodman outdoor
units units have a factory TXV? I don't want this to turn into a brand
discussion but if the Amanas don't do this at all then is there anyone
else who makes a lower cost unit with tx in the outdoor unit?

Also, should I insist that they insulate both the supply and return
outside the house?


s.


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