[DML] Re: R134 Freon @ $6.40 Per Can

["content22207" <brobertson@xxxxxxxxxxxx>]

Purists tend to argue against R134 on principle. I am very happy with all my conversions.

When I did locomotive maintenance we had some genset repowered units with A/C hoses that were at least 60 feet long. In that particular high impact environment hoses definitely hold up better than metal pipes -- where we usually had leaks were soldered joints inside the rooftop units.

The A/C lines on my school bus also are hoses, not pipe, and are quite lengthy too (I've got two ceiling mounted evaporator units -- one in front and one all the way in back -- a compressor on the engine, and a condensor under the floor -- *LOTS* of hose). 

Bill Robertson
#5939


--- In dmcnews@xxxxxxxxxxxxxxx, "Tom Niemczewski" <dmctom@...> wrote:
>
> Does anyone know why we have such long hoses? Is there any particular reason 
> for this?
> Since I have the body removed from the frame at the moment I'm thinking 
> about installing metal lines running from the condenser and evaporator all 
> the way back to the compressor and then use a short flexible hose to connect 
> to the compressor. Any thoughts?
> 
> BTW, the difference in pressure of R-12 versus R-134a is not that great. 
> Here are some temp-pressure points of both:
> Temperature (F) - R-12 (PSI) - R-134a (PSI)
> 0 - 9.2 - 6.5
> 50 - 46.7 - 45.3
> 100 - 117.2 - 123.6
> 150 - 234.6 - 261.4
> 
> At about 65 degrees F the pressures are the same and as temperature rises 
> the pressure of R-134a gets higher over R-12. Is it really that big of a 
> difference? At 150F it's less than 30PSI. R-12 will equal that pressure 15 
> degrees later. In my opinion this is not a factor for the hoses, the 
> compressor or cooling capacity.
> 
> Greetings from Poland!
> Tom Niemczewski
> Vin 6149 plus 2418, 3633, 5030, 16473, 17086
> Google earth: 52°25'17.66"N, 21° 1'58.40"E
> 




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