Re: Tempstar, TXV, R-410a,compressor, etc problem

Posted by lp13-30 on June 26, 2008, 1:07 am

It is really wierd that it would do that immediately upon startup. FWIW,
I have seen factory installed TXVs with the bulb mounted in about every
position you can imagine, some insulated and some not. I doubt if that
is going to make much difference. With insulation the valve should
actually close down a little more and give slightly higher superheat
than if it was not insulated. One more thing-- we have made it standard
on all 410 systems to install a sight glass-- not so much for the charge
itself, but for the moisture indicator. So far all have stayed clean and
green. Did you replace the drier when you recharged the unit? Well, I
guess if you got it to 500 microns and it held, moisture wasn't the
problem anyway. Larry

Posted by Noon-Air on June 26, 2008, 8:43 am

> It is really wierd that it would do that immediately upon startup. FWIW,
> I have seen factory installed TXVs with the bulb mounted in about every
> position you can imagine, some insulated and some not. I doubt if that
> is going to make much difference. With insulation the valve should
> actually close down a little more and give slightly higher superheat
> than if it was not insulated. One more thing-- we have made it standard
> on all 410 systems to install a sight glass-- not so much for the charge
> itself, but for the moisture indicator. So far all have stayed clean and
> green. Did you replace the drier when you recharged the unit? Well, I
> guess if you got it to 500 microns and it held, moisture wasn't the
> problem anyway. Larry

Sight glass for R410a?? I didn't know they had them on the street yet for
the higher pressures. What make/part number are you using??

Posted by Bubba on June 26, 2008, 9:24 am

On Thu, 26 Jun 2008 00:07:50 -0500, LP1330@webtv.net (lp13-30) wrote:

>It is really wierd that it would do that immediately upon startup. FWIW,
>I have seen factory installed TXVs with the bulb mounted in about every
>position you can imagine, some insulated and some not. I doubt if that
>is going to make much difference. With insulation the valve should
>actually close down a little more and give slightly higher superheat
>than if it was not insulated. One more thing-- we have made it standard
>on all 410 systems to install a sight glass-- not so much for the charge
>itself, but for the moisture indicator. So far all have stayed clean and
>green. Did you replace the drier when you recharged the unit? Well, I
>guess if you got it to 500 microns and it held, moisture wasn't the
>problem anyway. Larry

They didnt say why to change the charge but Im guessing that means
there was a bad batch of factory charged units. (Thats my guess).
I dont use sight glasses except on commercial stuff. Supposedly, the
sight glass is not a good indicator of charge anymore on the high
efficiency stuff? I didnt change the drier on the change-out of the
refrigerant. Just recovered it, evacuated to 500 (which took over 2
hrs) and then recharged it.
I have the old stuff and just checked it at 78 degrees. It should
register 233 psi and it shows 231 psi so I think even the slightest
gauge error puts that batch in the good category.
I havent a clue now but I havent heard from the
customer.............yet. :-)
Bubba

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