Because of the solvent action of R-12, any particles of grit, scale, dirt, or metal that the system may contain are readily circulated through the refrigerant lines. As a precaution against damage to the compressor from foreign matter, a strainer is installed in the compressor suction connection.

LIQUID STRAINER

A liquid strainer of the type shown in figure 16-17 is installed in the liquid line leading

Figure 16-17.-Liquid refrigerant strainer.

to each evaporator. These strainers protect the solenoid valves and the TXV.