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Thread: R12 to R134a
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19-07-2006, 08:32 AM #1
R12 to R134a
FIrst would like to say what a great forum,
This is my first entry, so sorry if i mess up !
ex Hotpoint engineer of 24 years, always done fridges/freezers,
but only the electrical side of things till last year for which i now involve myself in the refrigerant cycle.
Im converting a fridge/freezer that is R12 to R134a,
Thats a new R134a compressor and dryer.
The unit.. R12 specifies 280grams, not sure how much R134a to charge ????
Thanks for all info.
fireblade
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19-07-2006, 12:18 PM #2
Re: R12 to R134a
One way is to charge it till the low pressure pipe starts sweating....Thats the line back to the compressor.
Ensure no liquid gets back into the compressor, watch the "ice line"
Will take a little time to charge it correctly.........called " critical charge"
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19-07-2006, 10:42 PM #3
Re: R12 to R134a
Use R49 instead and reduce charge by 8 - 10%.
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20-07-2006, 10:04 AM #4
Re: R12 to R134a
A good starting point here is to charge 280g of 134a. if it goes BANG you were wrong. i dont think this is at all likely though.
Takes a licking, keeps on ticking.
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20-07-2006, 11:23 AM #5
Re: R12 to R134a
Just use same charge as the "OLD GAS " if the compressor is a ball of ice after its down to temp you have overcharged it and adjust accordingly .
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20-07-2006, 11:49 AM #6
Re: R12 to R134a
Thanks for the info guys
will let u know the outcome
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20-07-2006, 12:00 PM #7
Re: R12 to R134a
Please use MP39 or similar.
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25-07-2006, 12:10 AM #8
Re: R12 to R134a
I reckon you will need about 250g of R134a
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28-07-2006, 01:25 AM #9
Re: R12 to R134a
you do realize that you need to change the oil to POE right?
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13-08-2006, 11:46 AM #10
Re: R12 to R134a
Originally Posted by The MG Pony
new compressor comes with new oil.
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15-08-2006, 07:39 AM #11
Re: R12 to R134a
Originally Posted by Langer
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15-08-2006, 12:57 PM #12
Re: R12 to R134a
Originally Posted by Andy W
need to do anything else. Just fit the 134a pot in, you're not going to flush out a Domestic and change the cappillary line.
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16-08-2006, 10:16 PM #13
Re: R12 to R134a
Originally Posted by Langer
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17-08-2006, 07:36 PM #14
Re: R12 to R134a
Originally Posted by Andy W
'Tis only a domestic after all.
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18-08-2006, 11:01 PM #15
Re: R12 to R134a
Originally Posted by Langer
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19-08-2006, 09:02 PM #16
Re: R12 to R134a
If a job is worth doing it is worth doing right, if not then why do it at all?
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