What component ensures there is adequate flow to prevent damage by shutting down boiler operation when flow is too low?

What component ensures there is adequate flow to prevent damage by shutting down boiler operation when flow is too low?

• A. Low water cutoff switch
• B. Flow switch
• C. High limit controls
• D. Pressurization

Answer: (B)

Flow switch. The idea is to keep enough water moving so heat can be carried away and the boiler won’t overheat. A flow switch sits in the water path and monitors how fast the water is circulating. If the flow drops below the safe level, it immediately signals to shut down the burner, preventing damage to the heat exchanger and other components. This is different from a low water cutoff, which protects against the boiler running with too little water in the tank; High limit controls respond to temperature, not flow; and pressurization isn’t a flow-detection device.

Flow switch. The idea is to keep enough water moving so heat can be carried away and the boiler won’t overheat. A flow switch sits in the water path and monitors how fast the water is circulating. If the flow drops below the safe level, it immediately signals to shut down the burner, preventing damage to the heat exchanger and other components. This is different from a low water cutoff, which protects against the boiler running with too little water in the tank; High limit controls respond to temperature, not flow; and pressurization isn’t a flow-detection device.