HVAC Contractor Practice Exam Prep: Practice Test & Study Guide

In the context of installing a reversing valve on a heat pump, the correct number of brazed joints is four. This configuration accounts for the connections needed to facilitate the proper flow of refrigerant in both heating and cooling modes.

Reversing valves have multiple paths for refrigerant to follow, allowing the heat pump to switch between delivering heat and cooling. Typically, there are three ports involved: the inlet from the compressor, the outlet to the indoor unit (evaporator), and the outlet to the outdoor unit (condenser). Each of these connections requires a brazed joint for secure and effective operation.

In addition to these three ports, there's also a fourth joint associated with the service or equalization line, which helps maintain pressure and ensures the valve operates correctly under varying conditions. This fourth connection is essential for the reversing valve to function as intended and prevents refrigerant leakage.

Taking all these factors into account, the total number of brazed joints required during the installation of a reversing valve on a heat pump is indeed four.