Some automatically fired auxiliary boilers...

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Question 1 of 205eccefa3bacbc34ba4d47c40

Some automatically fired auxiliary boilers are equipped with the water level electrode assembly shown in the illustration. In this type of water level control, the burner circuit is completed through the __________. See illustration MO-0047.

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🔍 Key Concepts

• Conductive-type water level controls used on automatically fired auxiliary boilers • How electrode probes use the boiler water and boiler shell (metal body) to complete an electrical circuit • The difference between a physical conductor (metal or water path) and a magnetic or "neutral" reference

💭 Think About

• Look at the illustration: trace the wiring from the terminals at the top down through the electrodes and then to the boiler shell. What actually allows current to flow when the water is touching the probe tips? • Ask yourself: when the water level rises high enough to cover a given electrode, what exactly changes in the electrical path that lets the burner control relay energize? • Which of the answer choices describes a complete circuit path that depends on the presence of water in the drum, rather than just a particular wire or a magnetic effect?

✅ Before You Answer

• Identify what part of the assembly is grounded to the boiler shell and how that shell relates to the liquid in the drum. • Confirm which option involves electrical continuity through the fluid between metal parts, not just within a single metal leg or a magnetic field. • Eliminate any option that does not require the actual boiler water level to change in order to open or close the control circuit.

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