When performing a start-up, what is the first step?

When performing a start-up, what is the first step?

• A. Turn on the gas valve first
• B. Inspect ductwork
• C. Verify power supply and ensure all safety devices are in place; confirm thermostat settings and gas connections are secure.
• D. Check refrigerant charge

Answer: (C)

The first step is to verify power supply and ensure all safety devices are in place; confirm thermostat settings and gas connections are secure. This upfront check keeps everyone safe and sets the system up for a controlled, reliable start. Turning on the gas valve or trying to start the system without confirming power, safety interlocks, and proper gas connections could lead to unsafe ignition, gas leaks, or electrical hazards. Inspecting ductwork or checking refrigerant charge are important parts of system service and performance, but they don’t establish a safe, proper starting condition and are typically addressed after the initial startup checks. Once power is confirmed and safety components, thermostat, and gas connections are verified, you can proceed with the ignition sequence and system commissioning.

The first step is to verify power supply and ensure all safety devices are in place; confirm thermostat settings and gas connections are secure. This upfront check keeps everyone safe and sets the system up for a controlled, reliable start. Turning on the gas valve or trying to start the system without confirming power, safety interlocks, and proper gas connections could lead to unsafe ignition, gas leaks, or electrical hazards. Inspecting ductwork or checking refrigerant charge are important parts of system service and performance, but they don’t establish a safe, proper starting condition and are typically addressed after the initial startup checks. Once power is confirmed and safety components, thermostat, and gas connections are verified, you can proceed with the ignition sequence and system commissioning.