What does an HVAC technician need to check before starting a system?

An HVAC technician needs to check all electrical connections and leaks before starting a system to ensure safe and efficient operation. Properly functioning electrical connections are vital for the HVAC system to operate without risk of short circuits or malfunctions that could lead to equipment damage or hazards such as fires. Checking for leaks, especially in refrigeration systems, is also essential as leaks can reduce efficiency and impact the system's overall performance, leading to higher energy costs and potential environmental harm. This thorough inspection of both electrical components and the integrity of the system's seals helps guarantee that the unit is ready for operation and limits the risk of unexpected failures or unsafe conditions.

Other options such as simply checking thermostat settings or the external appearance do not encompass the critical checks necessary for safe startup and efficient operation, while monitoring maintenance frequency is useful for long-term upkeep but does not address immediate safety and functionality factors before starting the system.