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Posted by Don Ocean on May 17, 2009, 2:38 am
Stormin Mormon wrote:
> How are you charging R134A?
>
> CY: I havn't yet used 134a on the restaurant cooler. I'd
> like to, it's so much easier to charge.
I would not consider that the best alternative.
>
> As for dispensing any mixed gas.. send as a
> liquid to the gauges and then use an inexpensive device on
> your gauges
> to transfer it to a gas as it is charging.
>
> CY: I've got one of those "chargefaster" orifice gadgets.
> I'm not all impressed. Tends to freeze over, and shut the
> flow down.
That is because you are charging too fast.
>
> In many cases you can charge
> by liquid by carefully charging slightly over the target
> pressure. 20
> lbs over in automotive seems to work for
> residential/commercial as well.
> Weighing it in is the best. It is time you learned to charge
> with liquid
> etc.
>
> CY: I do have a scale, and do try to charge by weight. With
> a sight glass in my gages, I can feed liquid, hold the gages
> on their side, and the vapor goes into the blue line. It's a
> bit of a PIA compared to open the tank and stand back and
> watch.
Keep in mind for those small jobs that a charging cylinder works just
fine for measured amounts. I still use one of mine on occasion.
>
>
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Posted by Don Ocean on May 14, 2009, 11:14 pm
Stormin Mormon wrote:
> Last couple days, I've had the chance to work on a reach in
> cooler, at a restaurant. Under a counter. The old guy who
> runs the place says it needs freon every six months. The
> aluminum evaporator gets wet, and probably has a lot of
> pinhole leaks. I checked all the fittings, and find no leaks
> at fittings or braze joints. Metering device is TXV, and the
> system has a receiver.
>
> The system is probably 30 plus years old. The evaporator is
> above the compressor. About 8 inches higher, and maybe six
> feet to the side.
>
> Since the evaportator his higher, perhaps oil return isn't
> an issue. Since it runs off a TXV, maybe it will adjust to
> the lower heat capacity of 134a. Has anyone else tried such
> a conversion? I'd much rather be feeding it 134a, compared
> to some other gas or blend.
If its an R12 unit.. Use R409, R414B, R416A or a dozen other
alternatives. Slip in an ounce or so of Pag oil per manufacturers
specs. Go to Atofina,Icor, or other pertinent Websites.
>
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Posted by Stormin Mormon on May 15, 2009, 9:47 am
Looks like that's going to have to be the best answer. I put
in 409A the last time, see how long that charge lasts. It is
looking like I'd best to plan on adding several ounces of
409A every couple of months. Since the charge weight is well
under 50 pounds, it's legal to keep topping it off.
--
Christopher A. Young
Learn more about Jesus
www.lds.org
.
If its an R12 unit.. Use R409, R414B, R416A or a dozen other
alternatives. Slip in an ounce or so of Pag oil per
manufacturers
specs. Go to Atofina,Icor, or other pertinent Websites.
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Posted by Steve on May 15, 2009, 3:24 pm
> Looks like that's going to have to be the best answer. I put
> in 409A the last time, see how long that charge lasts. It is
> looking like I'd best to plan on adding several ounces of
> 409A every couple of months. Since the charge weight is well
> under 50 pounds, it's legal to keep topping it off.
Just because its "legal", doesn't make it right.
--
Steve @ Noon-Air Heating & A/C
"Stop calling me for freebies Satan,
I'll fix your air conditioner when you pay me, Cheapskate!"
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Posted by on May 15, 2009, 4:14 pm
wrote:
>Stormin Mormon wrote:
>> Last couple days, I've had the chance to work on a reach in
>> cooler, at a restaurant. Under a counter. The old guy who
>> runs the place says it needs freon every six months. The
>> aluminum evaporator gets wet, and probably has a lot of
>> pinhole leaks. I checked all the fittings, and find no leaks
>> at fittings or braze joints. Metering device is TXV, and the
>> system has a receiver.
>>
>> The system is probably 30 plus years old. The evaporator is
>> above the compressor. About 8 inches higher, and maybe six
>> feet to the side.
>>
>> Since the evaportator his higher, perhaps oil return isn't
>> an issue. Since it runs off a TXV, maybe it will adjust to
>> the lower heat capacity of 134a. Has anyone else tried such
>> a conversion? I'd much rather be feeding it 134a, compared
>> to some other gas or blend.
>If its an R12 unit.. Use R409, R414B, R416A or a dozen other
>alternatives. Slip in an ounce or so of Pag oil per manufacturers
>specs. Go to Atofina,Icor, or other pertinent Websites.
>>
PAG oil if for automotive use. POE oil is the correct oil for 134a in
refrigeration.
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>
> CY: I havn't yet used 134a on the restaurant cooler. I'd
> like to, it's so much easier to charge.