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I was on an ac call at a restaurant, when the owner had mentioned that the draft beer was warm, and he did not think the refrigeration system was working. The unit is a Nordic beer system model# 301 A power pack where the pump and the motor sit on top of the unit. It is an r22 unit that contains 15 oz. of refrigerant. The motor which is brand new, was hot to touch, and the compressor was off on overload. I opened the top of the unit where the evaporator, and fluid is and it was frozen soild. I normally just do HVAC, and had not worked on one of these systems before. I am assuming that the fluid is not circulating and that may be the reason for the freeze up, and the compressor going off on overload.
any assistance would be much appreciated, and also does anyone know the typical pressures and superheat that these units normally run at?. thanks to all