Refrigeration cycle
The refrigeration cycle consists of the following phases
Compression of gas generating heat
Cooling of superheated vapors in the condenser
Steam -> liquid conversion in the condenser
Expansion of the liquid in the expansion valve
Complete evaporation of the liquid in the evaporator with consequent heat absorption
Functional diagram R290
Components of the actual product line are
1) Compressor
2) Condenser
3) Expansion valve
4) Evaporator
5) Pressure tap
6) Draier filter
7) Hot gas valve
8) Models 121 & 161 have a double circuit Condenser can be water cooled
9) Pressostatic valve
Functional diagram R452A
On units settled for R452A refrigerant you have also
1) Compressor
2) Condenser
3) Expansion valve
4) Evaporator
5) Liquid receiver
6) Heat exchanger (boosted only)
7) Pressure tap
8) High pressure switch
9) Draier filter
10) Liquid valve
11) Low pressure switch
12) Hot gas valve
13) Condensation evaporator