Results 1 to 12 of 12
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22-06-2013, 10:04 AM #1
Can i use R404a in a R290 system?
Hi Folks
Quick question, i have a R290 freezer thats under performing and i need to weigh out the contents to ascertain weather it is low charge / possible leakage that is causing poor performance.
I however do not have any R290 to refill with but do have R404a,
can i use 404 in this 290 system or not?
Many thanks for your help
Pat..
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22-06-2013, 11:46 AM #2
Re: Can i use R404a in a R290 system?
I don't think you can interchange between 404a and r290, what are the symptoms of the freezer and what are you working on? Chest freezer/static shelf etc...
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22-06-2013, 12:21 PM #3
Re: Can i use R404a in a R290 system?
Oil be wrong! R22 would be nearer but why not get a can of R290, they sell it in 500g bottles.
Mostly found in Oxfordshire, UK :)
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22-06-2013, 12:26 PM #4
Re: Can i use R404a in a R290 system?
Thanks for the reply, its a foster eco pro 600 top mount cab first generation (2010/11) pull down is poor, and is effected by rising ambient temp, item is outside in a out building and the owner (friend) has a extractor fan running to remove excess warmth from the outhouse, takes around six hours to get back to -20 during the day it apparently struggles to achieve -13.
i suspect low charge, as the condenser etc is spotless, fan is working at a correct speed, internal has no air flow restrictions.
I have check the parameters on the lae controller and all are as per foster recommendations.
However without the appropriate gas to re-charge to correct quantity it is difficult to rule out the refrigerant as the culprit.
internal temp has been crossed with a freezer thermometer which reports the same as the display.
In the absence of R600 hence the question of ok to fill with 404a, which would in theory prove out the charge question.
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22-06-2013, 12:29 PM #5
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22-06-2013, 12:37 PM #6
Re: Can i use R404a in a R290 system?
Assuming its a capilliary system ,i couldnt see it working as monkey said oil would be wrong type and condenser would struggle with higher pressures of 404,Generally capilliaries are sized for specific gas type and dont work well with anything else
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22-06-2013, 01:17 PM #7
Re: Can i use R404a in a R290 system?
Mostly found in Oxfordshire, UK :)
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22-06-2013, 01:39 PM #8
Re: Can i use R404a in a R290 system?
I've seen people use 134a before and although it may not be correct, the systems have worked. ..... Now ill get my coat>>>>>>>
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22-06-2013, 03:00 PM #9
Re: Can i use R404a in a R290 system?
thanks for the help, will try d&w as i have an account with them, i have done the relevant training, i just concentrate on the transport side of things, and not bother with commercial / domestic much, hence no gas, just did not want to buy a cylinder for 150 grams of gas, so hopefully they have the cans.. cheers
pat..
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22-06-2013, 11:35 PM #10
Re: Can i use R404a in a R290 system?
Health and safety first..........unless I'm in a hurry.
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03-11-2013, 07:37 PM #11
Re: Can i use R404a in a R290 system?
Propane damages chloroprene rubber.
HFCs swell nitrile that propane is resistant to.
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17-11-2013, 12:53 AM #12
Re: Can i use R404a in a R290 system?
i think that is correct 134 will be better in this case .
cooled things come to those who wait...