System diagram: 7 compressor,  11 evaporator

2, 16 evaporator  1, 20 condenser,  23 heat exchanger (water-cooled condenser or evaporator), 

13, 18, 21 expansion valve,  19 capillary,  3 collector,

8, 30 pressure controller,  14 suction gas controller,

22, 26 flow meter,  29 filter,  25 water tank,  31 circulation pump, T₁-T₁₀ thermometer,  S sight glass,  V₁-V₁₁ manually operated valve, M motor, p₁-p₂ manometer, RV return valve