freezer room comp frost

[devlin maguire]

What is the most likely reason for frosting back to the compressor, cap system, R404a.
LS .8 barg, gas weighed out gas weighed in .660Kilo, pulls to -10c then frost appears,
Dev

[troymedhurst]

Have you checked your superheat?
If the charge is right and you have very low superheat, I would say that your airflow has been reduced and you are unable to boil off the refrigerant.
What was the air off temp when you were checking you suction press/temp?
Also is the sution return lagged? As at the outlet of the evaporator even with 5k superheat it will still be around -25oc, is it just normal temps?
hope this helps!

[devlin maguire]

Hi and thanks,This a freezer monobloc in a 10m3 I had an issue with the evap fan some one had changed it for one going round the wrong direction, but you mentioned air flow this may be a issue as perhaps the factory spec one had a greater air throw by an greater RPM any way I have fitted a 18W stock motor and reversed the direction to get it running, I think I will need to speak to Rivacold re the motor spec SH I cant check but I have weighed in the correct charge SC I checked with the air TD only,any ideas would be great
Dev