Behind the bar
Back-bar and underbar coolers run in heat and steam, packed tight, opened constantly. Their small condensing units overheat first: high head pressure, a compressor cycling on its overload, a start relay that finally fails. The mechanic tests start components and measures head pressure and condensing temperature, and repairs what the heat has damaged. Draught systems and keg coolers are serviced as refrigeration: the cooler, its coil and its controls.

