134a discharge pressures

Posted by Stormin Mormon on September 19, 2009, 11:25 pm

Not seen those. Never know, might be a good idea. Or, more
gadgets to haul around. Offhand, I think it's bad idea for
techs like me.

Thinking some more about 134a. When I start up the box, the
inside can be 70F or hotter. The system is designed for
evaporator temps more like 30F. So, the supeheat is way off
the charts. Helps explain the high discharge temps.

--
Christopher A. Young
Learn more about Jesus
www.lds.org
.

Stormin Mormon wrote:

> I'm sure 134a works a LOT better at medium and high temp
> applications. Well, it keeps ice cubes cold enough. Sure
> was
> simpler when we only had four or five common gasses. Now,
> we've got a real nightmare.

Have you seen the new square and triangular shaped snap on
connectors for the new refrigerants? The manufacturers are
trying to make sure new and old refrigerants don't get mixed
up.

TDD

Posted by The Daring Dufas on September 19, 2009, 11:36 pm

Stormin Mormon wrote:

> Not seen those. Never know, might be a good idea. Or, more
> gadgets to haul around. Offhand, I think it's bad idea for
> techs like me.
>
> Thinking some more about 134a. When I start up the box, the
> inside can be 70F or hotter. The system is designed for
> evaporator temps more like 30F. So, the supeheat is way off
> the charts. Helps explain the high discharge temps.
>

In hot kitchens or in older stressed equipment, I
charge them with R-416a. It runs a lower head
pressure than R-12 or R-134a and can be used in
place of either. I've had very good luck with it.

http://www.refimax.com/Page/5681/Products_-_R-416A.aspx

TDD

Posted by Stormin Mormon on September 20, 2009, 12:03 am

Thanks for the ideas, and information. One parts house near
me has that. I've used 409a with great success. Advertised
as a direct drop in for R12, with same mineral oil. But the
416a is noticably cheaper. I'll try that next time.

--
Christopher A. Young
Learn more about Jesus
www.lds.org
.

In hot kitchens or in older stressed equipment, I
charge them with R-416a. It runs a lower head
pressure than R-12 or R-134a and can be used in
place of either. I've had very good luck with it.

http://www.refimax.com/Page/5681/Products_-_R-416A.aspx

TDD

Posted by The Daring Dufas on September 20, 2009, 5:29 pm

Stormin Mormon wrote:

> Thanks for the ideas, and information. One parts house near
> me has that. I've used 409a with great success. Advertised
> as a direct drop in for R12, with same mineral oil. But the
> 416a is noticably cheaper. I'll try that next time.
>

Johnstone stocks it in 25lb cylinders and in the small 9.6oz
cans. The screw on can adapter has left hand threads if I'm
remembering correctly. I have a 25lb cylinder and haven't
used the small cans in a long while.

TDD

Posted by Lp1331 1p1331 on September 20, 2009, 6:37 pm

I used a small can of one of the R12 replacements that was specifically
sold for use in household ref/freezer applications. I'm thinking it was
414A, but I wouldn't swear to it. Anyway, I just used a side puncture
can tap and it worked fine. If you bought a jug of every single R12
supposedly drop-in that is on the market, you'd be hard pressed to fit
them all in an empty service van-- definitely wouldn't fit in a Pinto,
even a wagon. Larry

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134a discharge pressures - Page 3