What are the correct terminals to measure voltage to the main gas valve?

The correct measurement terminals for checking the voltage to the main gas valve are the MV and C terminals. In this context, "MV" stands for the main valve terminal, which connects to the gas valve that controls the flow of gas to the burner. The "C" terminal typically refers to the common terminal, which acts as a reference point for voltage measurement. When you measure the voltage across these two terminals, you can determine if the gas valve is receiving the appropriate voltage signal to open or close, thereby ensuring proper operation of the heating system.

This choice is significant because understanding how to correctly identify and measure across these terminals is critical for troubleshooting issues related to gas supply and valve operation in heating systems. Proper voltage measurement ensures that the components are functioning as intended, thus maintaining system safety and efficiency.