Went to our local ice-cream manufacturer today to check the cold stores, one at -27°C the other at -24°C.
On the whole not too bad, they had lost a controller due to recent power fluctuations but soon fixed.
The problem they have is with the evaporator fan motors freezing up during defrost, the bearings dry (frozen grease?) and the motors lock up.
Does anyone have any knowledge of using heaters to protect the motors and also the fan blades from sticking to the fan cowl.