Electrical Components
The principal electrical components of a mechanical refrigeration system include the following:
1. Electric compressor motor
2. Compressor contactor or relay
3. Compressor starter
4. Overload protector
5. Capacitor
6. Potential relay
7. Pressure switch
8. Evaporator fan motor
9. Condenser fan motor
10. Evaporator fan relay
The wiring diagram in Figure 9-9 illustrates the relationship of these various components. Switches, relays, and capacitors have already been described in considerable detail in Chapter 6 (“Other Automatic Controls”) in Volume 2.
The room thermostat is sometimes included when the electrical components of a refrigeration system are listed. The reader is referred to Chapter 4 (“Thermostats and Humidistats”) in Volume 2 for detailed information about thermostats.
