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Posted by Bubba on June 22, 2008, 9:04 pm
wrote:
>
>>
>>>Bubba wrote:
>>>> Has anyone been seeing new TXV problems?
>>>> Ive recently installed a Tempstar 5 ton 14 SEER condenser with an
>>>> Aspen TXV coil. (Sorry, the Tempstar matching coil had NO WAY fo
>>>> fitting in that space.) Ran fine about a month. Customer called
>>>> saying it wasnt cooling and was making a ton of noise outside. I get
>>>> there turned it on and watched it run perfectly and flawlessly for
>>>> about 1/2 hr. Subcooling was perfect. Went to the truck to do some
>>>> paperwork and customer came out and told me the noise started again.
>>>> Sure enough the Internal relief valve opened up in the compressor.
>>>> Shut the unit off and back on and it ran for almost 2 weeks fine
>>>> again. Same problem yesterday. Gotta change out the TXV this week
>>>> which is evidentially closing intermittently.
>>>> Had a Trane dealer close to me tell me the same exact scenario about a
>>>> week ago of a new Trane system he installed.
>>>> Anyone else found this lately?
>>>> Bubba
>>>
>>>Check the mesh screen in the liquid line connection at the valve. Also,
>>>install a new liquid filter drier in the liquid line before the valve. If
>>>the valves thermal diaphram is failing, it may be a "bad" liquid charge on
>>>the thermal bulb. A failing thermal bulb will close the valve.
>>
>> Thanks for the info Zyp but these are the factory installed cheap
>> expansion valves. You know, the ones those Tiwanese or Koreans or
>> whoever is shipping this cheap junk. No serviceable screens, parts or
>> adjustments. The bulb charge is not bad as that would shut the valve
>> and keep it shut. This is a very intermittent problem. It has occured
>> twice in about a 2 to 3 week period.
>> Im thinking there may be a lot of this showing up shortly.
>> As always, I always install a new drier at the indoor coil.
>> Hoping I find others that are running into this problem.
>> I just dont want to change the valve with another valve that has the
>> same problem.
>> Bubba
>
>Is it possible that the bulb is not attached correctly or if its R-22, I
>would also be wondering if there is some moisture in the system, or non
>condensibles that make it *seem* like the valve is closing.
>
Sorry about that. This is Strictly R-410a systems. NO R-22. Bulb is in
the 10 oclock position on a horizontal run and insulated. No moisture
unless the new drier and 400 microns I pulled on it and held with my
JB Vac pump and digital guage lied to me. :-)
Bubba
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