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Installed on the inlet side of the pump. When water is drawn into the pump, the diaphragm of the switch falls and the contacts the switch close completing the circuit to the burner. When the flow stops, the switch opens and shuts the burner off.
Installed on the inlet side of the pump. When water is drawn into the pump, the diaphragm of the switch falls and the contacts the switch close completing the circuit to the burner. When the flow stops, the switch opens and shuts the burner off.