Controls and Other Circuit Components

9.1 I NTRODUCTION

A refrigeration system can be built with only the four essential components:

1. Evaporator

2. Compressor

3. Condenser

4. Expansion valve

Other system controls and components will, however, be necessary for safety, maintenance and control purposes. Figure 9.1 shows components associated with the compressor and Figure 9.2 shows some of the frequently used circuit components. Any pressure vessel in the circuit, depending on its size, may require a safety pressure relief device.

Suction Pressure Gauge

Discharge Pressure Gauge 5

High-pressure Cut-out

Discharge stop valve

Low-pressure

I cut-out

IP1

Oil pressure switch

Oil pressure

115

Figure 9.1 Components associated with compressor

Figure 9.2 Components for direct expansion circuits

Posted in Refrigeration and Air Conditioning