I have been to a few jobs recently involving hydrocarbons [R290 R1270] in multi deck chiller intregals in supermarkets. Cabinets have been only reaching 6 degrees, checked suction pressures which were 1 - 2 bar above normal operating pressures. Cleaned condensers, no difference made. Went down the road of removing refrigerant, purging system with nitrogen, replacing drier, vacuuming out and recharging system. This fixed the problem. My own theory to why these faults occur is that the refrigerant is affected when high head pressures occur when the condenser is choked or a condenser fan motor fails. Has anybody got any other ideals ?
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