1 displays and control panel,  2 pressure controller,  3 manometer,  4 solenoid valve for bypass,  5 compressor,  6 pressure sensor,  7 sight glass,  8 filter/drier,  9 collector,  10 system diagram,  11 temperature sensor,  12 air-cooled condenser, 13 heating (heat load),  14 refrigerating chamber with transparent door, 15 thermometer,  16 flow meter,  17 expansion valve