176. Which of the following actions takes place in the control circuit of a semi-automatic (manual ignition) fired auxiliary boiler when the desired steam pressure is obtained?

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secures the burner circuit and prevents manual re-starting of the burner until the steam pressure falls below the set cut-in pressure.

176. Which of the following actions takes place in the control circuit of a semi-automatic (manual ignition) fired auxiliary boiler when the desired steam pressure is obtained?

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