An overcharge of refrigerant generally causes which of the following?

An overcharge of refrigerant leads to increased head pressure within the system. When there is too much refrigerant in the system, it can create excessive pressure in the condenser as the refrigerant is being compressed and circulated. The head pressure is the pressure in the condenser that must be overcome to allow the refrigerant to flow through the system; thus, more refrigerant means more pressure is required.

Higher head pressure can also lead to a variety of inefficiencies and potential problems, such as reducing the system's efficiency and causing it to overheat. Additionally, it can lead to liquid refrigerant entering the compressor, which can damage the compressor and further disrupt the cooling process. Understanding the relationship between refrigerant charge levels and head pressure is critical for maintaining system efficiencies and avoiding expensive repairs in HVAC systems.