1 condenser with fan,  2 normal cooling compartment ("cooler"),  3 inlet pressure control,  4 deep-freezing compartment ("freezer"),  5 expansion valve,  6 solenoid valve,  7 temperature display with selector switch,  8 filter/drier,  9 system diagram, 10 fault switch,  11 pressure gauge,  12 pressure switch,  13 power meter,  14 compressor,  15 collector