How does the service person check gas pressure to the manifold of a gas burner?

• A. With a manometer attached to the gauge opening on the outlet of the pressure regulator with the burner on
• B. By measuring flame color
• C. By listening for a hissing sound
• D. By measuring the gas temperature

Answer: (A)

Checking manifold pressure means measuring the actual gas pressure delivered to the burner while it’s firing. The proper way is to attach a manometer to the test connection on the regulator’s outlet and have the burner on. This setup reads the pressure the burner sees under operating conditions, usually in inches of water column (in. wc). Compare the reading to the appliance’s spec for the gas type and model. If the pressure isn’t within spec, adjust the regulator or gas valve and recheck until it matches. This direct pressure measurement is reliable because it reflects what the burner actually experiences, unlike other indicators. Flame color isn’t a precise gauge of pressure and can be misleading, a hissing sound only shows that gas is flowing, not the exact pressure, and gas temperature doesn’t indicate manifold pressure.