[AT] OT Hydrocarbon Refrigerant

[Ivan]

Cecil , I have started using stuff  called enviro safe , R 22A  in my 
motorhome and in the house . Some kind of propane blend too .  I had to 
top  off the motorhome again tonight so went back to double check the 
instructions .  They say to charge to ambient temp minus 10 above 70 
degrees and lower than that to only 5 below . But in no conditions to go 
over 85 psi  !   So its charged to 85 on the low side and the line is 
sweating a little . Inside the unit is blowing 58 degree air out of the 
vents with inside temp of 81 .  It is slightly overcharged but since its 
leaking it'll only work for a week or so , hopefully till we get back 
from down south . I got faith in the winnebago , theres three cans plus 
the gauges .
   I used to be able to get my old truck down to 38 degrees out of the 
vent with R134 but since I changed trucks no way .          Ivan

  On 6/28/2012 8:10 AM, Cecil R Bearden wrote:
> 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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