When installing an A/C system filter without an orifice, it should be installed in which line?

When installing an A/C system filter without an orifice, it should be placed in the liquid line. The liquid line carries refrigerant that has been condensed and is typically at high pressure. Installing the filter in this line is crucial because it helps to trap debris and contaminants that could harm the expansion device and other components downstream.

Filters in the liquid line are essential for maintaining system efficiency and performance, as they prevent particles from entering the evaporator coil and other sensitive components. This strategic placement ensures that the refrigerant entering the evaporator is clean and helps to extend the life of the system.

Choosing to install the filter in the suction, discharge, or equalizer lines may not provide the same level of protection. The suction line carries low-pressure refrigerant vapor back to the compressor, while the discharge line carries high-pressure vapor from the compressor to the condenser. The equalizer line is typically associated with balancing pressures in the system. Placing a filter in these lines would not be effective in preventing contaminants from reaching critical components in the liquid flow path.