Where should a filter drier be placed in relation to the TXV?

The filter drier should be placed ahead of the TXV to ensure that the refrigerant is filtered and any moisture is removed before it enters the expansion valve. This is important because the TXV regulates the flow of refrigerant into the evaporator, and contaminants or moisture could cause it to malfunction, leading to inefficient operation or potential damage to the system.

By positioning the filter drier before the TXV, the system benefits from clean, dry refrigerant, which optimizes the performance of the TXV and the overall HVAC system. This placement helps maintain the efficiency and longevity of the components involved in the refrigeration cycle.