So what have I sucked up first. The R134 or the Propane.
I could always add more propane to get it to work better eh?
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So what have I sucked up first. The R134 or the Propane.
I could always add more propane to get it to work better eh?
That definitely won't work for i capillery system.....................Quote:
Originally Posted by 123rover50
.
Where most of the 'drop in' replacements for the good old R12 designed systems, fall down, is at low temp,such as domestic refrigerators & any type of freezer.
R409a is one of the exceptions mainly because it has a lot of R22 in it.The more 134a you have in the replacement refrigerant,the worse it is at low temps.
At medium temp they aren't to bad
At high temp it they also aren't to bad,but they must have a well sized condenser.
easy to work out...
in an enclosed room crack open the bottle and hold a lit match to the nozzle.
IF you drop dead of phosgene poisoning it was the R134
If you die from an explosion and subsequent burns it was the propane.
You will never know.Quote:
Originally Posted by 123rover50
It will never be as good as when it had R12,as r413a has too much r134a in it.
I have inadvertantly charge refrigerants as a vapour when should have been charged as a liquid & never had a problem,but the systems have been larger than yours.
Anyway,once the Carbon levey comes in,no one will be able to afford the stuff anyway:mad:
R134a when burns causes phosgene,didn't think it had chlorine in it?Quote:
Originally Posted by Blknight.aus
If it does,i could go back to the old reliable leak lamp.....
I could try the test,but with all the rules,i would lose my license & probably end up in jail;)
Its a eutectic plate freezer so its low temps I am after. Its not capillary tube, I put in 1 ton TX valves. I have two in parallel with line valves to select in case of a blockage. Big roof mounted condenser and also use it as aircon in the cab by selecting which of the two liquid line valves I open. Thought I may be able to use both but does not work that way.Quote:
Originally Posted by scarry
Its one or the other but of course the aircon gives higher head pressures so dont use it as the freezer was the primary reason for building it.
Reminds me of the days i used to do trawlers!:eek:Quote:
Originally Posted by 123rover50
IT doesnt. But the end result of breathing oxidised R134a causes symptoms near enough to the same...Quote:
Originally Posted by scarry
From this site
Untitled Document
comes this
http://www.refrigerants.com/msds/r134a.pdf
a very generic MSDS for the gas (theres literally hundreds of "varients" on the gas)
if you drop in on the site theres a bunch of MSDS's for the more common refrigerants including 6 versions of R134......
but the real trick remains getting R134A to burn, its not flamable under normal atmospheric conditions and a match isnt enough heat to light it off anyway (unless your definition of a match is nearer to "roadflare" than "redhead")
For the older engel fridges I use HR-12 as a drop in replacement for R 12 as it uses the same oil and at the time I was choosing my gasses for some jobs had the nearest compatability for pressure/temp/quantity. The engel I first charged with it quite happilly freezes everything at setting 2.....