[AT] OT Hydrocarbon Refrigerant

[Chuck Saunders]

RV refrigerators are ammonia

On Thu, Jun 28, 2012 at 10:00 AM, charlie hill
<charliehill at embarqmail.com> wrote:
> Larry, a leak at the ice plant in a town near here was discovered about 2 AM
> Monday morning when a passing police officer smelled the ammonia.  Most of
> the old ice plants around here are still running ammonia systems.  I guess
> they are grandfathered in somehow as I doubt the government would let you
> build one today.  The one here in this town got in such bad shape a few
> years ago that they tore it down and didn’t replace it.  I suspect that
> might have had more to do with good highways and the economy of trucking
> than anything else.
>
> Charlie
>
> -----Original Message-----
> From: Larry Goss
> Sent: Thursday, June 28, 2012 10:33 AM
> To: Antique tractor email discussion group
> Subject: Re: [AT] OT Hydrocarbon Refrigerant
>
> Right.  You can use almost anything for refrigerant.  Some are better than
> others, and easier on the environment.  My father worked in refrigeration
> design for years.  His first patent was for the sintered bronze motor
> bearings that made hermetically-sealed refrigeration systems possible.  That
> was in 1928 when GE was getting geared up to produce the "monitor top"
> domestic refrigerator.  Many, many years later, I talked with him about the
> various things that could be used as a refrigerant.  He lamented the fact
> that the industry ever got away from ammonia systems. I complained and said,
> "But it stinks!"  He said, "Yeah, but you at least know when you have a
> leak, and it's a whole lot easier on the environment."
>
> In other news, I see this morning's headlines saying that GE is expanding
> refrigerator production in Louisville, and will be hiring 350 new employees.
>
> Larry
>
> ----- Original Message -----
> From: k7jdj at aol.com
> To: at at lists.antique-tractor.com
> Sent: Thursday, June 28, 2012 9:00:45 AM
> Subject: Re: [AT] OT  Hydrocarbon Refrigerant
>
> I know nothing about A/C but my son is using propane for refrigenant.  Works
> great.  I understand that propane is used in Europe.
>
> Gary
>
> Renton, WA
>
>
>
> -----Original Message-----
> From: Cecil R Bearden <crbearden at copper.net>
> To: Antique tractor email discussion group <at at lists.antique-tractor.com>
> Sent: Thu, Jun 28, 2012 5:19 am
> Subject: Re: [AT] OT  Hydrocarbon Refrigerant
>
>
>
> OK, I know this is off topic, but if I donh't have A/C in the tractors
> and trucks this summer, I won't be able to drive these antique tractors.
>
> I also have heard all the arguments about  HC refrigerants being unsafe
> and all that other crap.   I have tried to research the web about folks
> experience with these and every time I find something relevant the
> thread is hijacked by some all-knowing guru who keeps flaming the person
> for using something other that what the politicians and the Dupont owned
> EPA has dictated.   SO, Dont start with the safety etc CRAP.. I have
> heard and read it all.
>
> I have used Red Tek for years but it has been on capillary tube or
> orifice tube systems.   I recently had problems with my 94 Dodge Van
> with rear air not cooling.  It would get 70 deg, but not lower.  It used
> to blow 40deg air on 134A.    I pumped it down and added ES-12A, the
> same thing as Red Tek, and I would get a sweating suction line, but only
> 68deg air in a 98deg outside temp.   gauge readings were 175 to 200 high
> and 35 on the low.   I changed the expansion valve and drier and got the
> same  results.   I then changed the compressor and recharged without
> pumping down the system as was described in some notes on ES-12A
> (Envirosafe Website)  I got about 205 -210 high side and 35 to 40 low,
> with 100 deg outside air and working in the shade ( My outdoor shop).
> At 205 to 210 high side, the gauge needle was fluttering or vibrating
> madly from 195 to 215.  If I lowered the pressure by letting some
> refrigerant out, it would quit fluttering at 195.   I did not have any
> sweating on the suction line this time, and the air was 70 deg out the
> vent.  I might add that the vent temp was the same front and rear.   The
> systems are connected in parallel, so if one exp valve is bypassing,
> then that is probably the high pressure reached.   I varied the amount
> of refrigerant etc, but cannot get anything lower than 70 deg out the
> vent.   I have opened the evaporator box, and made sure I have a clean
> evaporator to get the max air flow.
>
> I contacted Enviro safe tech who suggested that the expansion valve was
> causing the flutter and allowing refrig to bypass at a lower pressure
> than needed to get a full refrigerant =coverage on the evaporator.
> Since the front and rear are connected in parallel, you cannot easily
> determine which valve is the problem.   I replaced the front.
>
> Any suggestions.    I used the ES-12A because the price of 134A has
> gotten expensive.
>
> Cecil in OKla
>
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