In HVAC systems, the primary objective of a load limiting mechanism is to:

The primary objective of a load limiting mechanism in HVAC systems is to control cooling capacity. This mechanism is essential for ensuring that the system operates efficiently and effectively according to the demand placed on it. Controlling cooling capacity allows the HVAC system to adjust its output based on real-time needs, rather than running at a maximum capacity regardless of the conditions.

When cooling demand is lower, the load limiting mechanism can reduce capacity by adjusting the amount of refrigerant used or altering the compressor's operation, preventing excess cooling and potential energy waste. This not only ensures comfort levels in the conditioned space but also helps maintain energy efficiency and reduces operational costs. In addition, it can protect the equipment from excessive wear and tear by avoiding operation at capacities that the system is not designed for under certain conditions.

Other options do not primarily address the core function of load limiting mechanisms. Increasing airflow is more relevant to system design rather than direct control by load limiting, maintaining a constant temperature is a broader goal of an HVAC system, and reducing refrigerant use may be an indirect benefit but is not the primary function of load limiting mechanisms.