Gas Heat ESCO Practice Exam

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At what gas pressure will redundant gas valves on gas furnaces shut down?

10.5 in W.C.
12.5 in W.C.
13.5 in W.C.
15.5 in W.C.

The correct answer is: 10.5 in W.C.

Gas furnaces are typically equipped with redundant gas valves to ensure safety in case of pressure-related issues. These redundant gas valves are designed to shut down at a specific gas pressure to prevent any potential hazards. In this case, the correct answer is 10.5 in W.C. (Water Column). At this pressure point, the redundant gas valves will automatically shut down, indicating a system malfunction or potentially dangerous situation. It is crucial for HVAC technicians to be aware of these safety features to properly diagnose and address any issues related to gas pressure in gas furnaces. Options B, C, and D are incorrect as they do not correspond to the typical gas pressure at which redundant gas valves are designed to shut down in gas furnaces.