What is the first step when commissioning a gas-fired appliance?

The first step when commissioning a gas-fired appliance is to verify that the fuel corresponds to the name plate. This is crucial because every gas appliance is designed to operate with a specific type of gas, whether it be natural gas, propane, or another fuel. Using the wrong type of gas can lead to improper functioning, safety hazards, and potential damage to the appliance.

It is essential to ensure that the fuel source aligns with the manufacturer's specifications as indicated on the name plate before proceeding with any further setup or testing. This step ensures that the appliance will operate safely and effectively.

Once this verification is complete, other items like checking venting systems, gas line pressure, and inspecting for leaks can be done, but confirming the fuel type must come first to ensure safety and compliance with manufacturer guidelines. This foundational step helps to prevent accidents and system failures when the appliance is put into operation.