Re: R404a to R407a Retrofit
Is R407a the best choice ?
Some alternatives maybe... http://bit.ly/2eswIeT
Re: R404a to R407a Retrofit
Hi Jurgen
You've probably done this now, but I would have used R442a...
Unlike most of the other replacements, this is more efficient than R404a
https://www.boconline.co.uk/internet...9184.pdf?v=1.0
Re: R404a to R407a Retrofit
I have been using R448A and R449A for retrofitting from R404a and this has been the far simplest change out process with these two refrigerants.
Always change the oil!
Re: R404a to R407a Retrofit
If I may know, the difference between refrigerant 404a and a [advert removed] is better suited for air conditioning engines.
Re: R404a to R407a Retrofit
We are using R448a when changing from R404a new filters and adjust the suction target. We have one site using R449a it's a pain as this gas is not readily available in large quantities we usually need 100kg per brake down and takes the supplier 12hrs to get enough up to us.
Re: R404a to R407a Retrofit
In the past I have used 422 d and 407c to replace r 22, someone had been before me and retrofitted r 404a but they didn't change the oil and it wouldn't hold temperature, and the running costs had increased. R 422 d is an interim replacement and will probably be phased out after 404 a.
I heard today from a colleague that BOC are buying reclaimed 404 a, so I need to check with them to see if its true. I only reclaim if the system has a bad leak, although I am slowly realising that recharging a system with a fresh charge is probably like giving caviar to a pig, as it will be a banned substance.
Its probably more economical in the long run to retro fit, than to fully reclaim and recharge due to the short time it will be allowed to be in the system. Retro fitting is probably a better option than topping off a fractionated leftover charge, any drop in efficiency probably won't compare.
Re: R404a to R407a Retrofit
I have been using R422A for retrofitting, mainly in ice machines, however before this I used R448A, however the supply vs demand seems to be lacking and locally the prices have been starting to rise as a result of this.