Industrial Maintenance Technician Practice Test 2025 - Free Maintenance Technician Practice Questions and Study Guide

In a condensing unit, the low voltage controlled contactor primarily functions to control the compressor and potentially other components based on signals received from the thermostat. When the thermostat calls for cooling, it sends a low voltage signal to the contactor, which then closes the circuit to energize the compressor and possibly the fan. This action helps regulate the temperature within the space by ensuring that the refrigerant cycle is active when required.

While the other options are related to the overall operation of the cooling system, they don't specifically revolve around the direct control of components by the contactor. Refrigerant flow and condenser pressure are influenced by the operation of the compressor, but they are not directly controlled by the contactor itself. Similarly, airflow is managed by fans, which may be energized by the contactor, but it is not the primary function of the contactor to control duct airflow directly. Therefore, the low voltage controlled contactor's key role is indeed related to the operation of the thermostat and controlling the compressor based on its signal.