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Thread: Refrigerant charge
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04-06-2006, 07:48 PM #1
Refrigerant charge
Hello, Is there any way of finding the charge/volume of a system?, say there's been a leak, it's been fixed, and now you want to top it up.
Cheers,
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04-06-2006, 07:51 PM #2
Re: Refrigerant charge
try and find an Info plate, if no info plate then ya got me, I have the same problem with a twist lol.
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04-06-2006, 10:55 PM #3
Re: Refrigerant charge
Top up until reaching spec subcooling.
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05-06-2006, 08:44 AM #4
Re: Refrigerant charge
no.....
untill you get 3-5 c super heating
afeef
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05-06-2006, 10:46 AM #5
Re: Refrigerant charge
Superheating can be varied depending on the TXV adjustment. Refrigerant charge must be checked against subcooling, not superheating.
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05-06-2006, 11:12 AM #6
Re: Refrigerant charge
but the most important term is the superheating ,
the effecincy of system is depend upon it , the life of compressor depending upon it also
thanks no neck name
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05-06-2006, 11:32 AM #7
Re: Refrigerant charge
How many kW on which evaporation temperature?And type of machine also?Which refrigerant you use?
Renato
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05-06-2006, 02:26 PM #8
Re: Refrigerant charge
Originally Posted by afeef
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05-06-2006, 05:56 PM #9
Re: Refrigerant charge
1. check the compressor current of a good equipment ( the same working conditions)
2. take it as reference and charge the problem equipment.
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05-06-2006, 09:15 PM #10
Re: Refrigerant charge
This was already on this forum but charging by current is completely wrong.
I should say, first subcooling and cross-check also superheat.
But you can't predict this on forehand.It's better to keep your mouth shut and give the impression that you're stupid than to open it and remove all doubt.
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05-06-2006, 10:07 PM #11
Re: Refrigerant charge
Keep adding gas untill the sight glass fills up (or your bottle runs out..lol)
If your comp gets covered in ice then start to runnnnnn.
ChillinIF AT FIRST YOU DON`T SUCCEED.
DESTROY ALL EVIDENCE THAT YOU TRIED!
and go get a cuppa
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05-06-2006, 11:36 PM #12
Re: Refrigerant charge
My vote is on sight glass, I winged it and did just that on my totally pieced together from archaic parts system and bang, hit -34 under load using R-290 and a 1/2ton R-12 TXV under load, and interestingly enough didn't take much extra gas to get it full
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06-06-2006, 05:48 AM #13
Re: Refrigerant charge
Originally Posted by The MG Pony
but not to determine the exact refrigerent needed .
afeef
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06-06-2006, 07:01 AM #14
Re: Refrigerant charge
Ya I know that, but for a good fast fix it does the job marvellously
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07-06-2006, 02:08 PM #15
Re: Refrigerant charge
Hi Nui
If in doubt than go back to basic.Check on the spec or info on the nameplate of the unit like a few of our members recommended. Reclaimed the refrigerant performing liquid transfer, weigh the charge and add the necessary amount short.
Good luck mate.
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11-06-2006, 05:26 AM #16
Re: Refrigerant charge
My vote is on sight glass, I winged it and did just that on my totally pieced together from archaic parts system and bang, hit -34 under load using R-290 and a 1/2ton R-12 TXV under load, and interestingly enough didn't take much extra gas to get it full"If Hannah was an air handler, I would be a condensing unit so I could open her TXV and pump my refrigerant through her coils." - a HVAC friend of mine
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12-06-2006, 11:23 PM #17
Re: Refrigerant charge
Why not?, in reality the whole thing is a real hack job of a unit that I build whilst I am building the "real" system.
"The real" System I'm making will be using R-134a, I may use a mix or R-134a and R-600 to improve its efficiency.
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12-06-2006, 11:51 PM #18
Re: Refrigerant charge
You could be very technical about the situation and work out the total volume of the different phases!
:0j p g
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