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Was R134a on the plate, charge and all stamped. One of my engineers, decanted and recharged to the correct charge, again with R134a, still wouldn,t come down in temp.
I was on site, looked at it, compressor was R404a, the pressure switch for bringing on the cond pump was even set for 12 bar. I said to try recharging with R404a, as the compressor was fit for it.
The things a bloody blast freezer now
No disrespect but on the data plates they also include the type of gas which is used in the insulation of the panels/sides which as it happens is R134a