Hydrolevel Low Water Cut-Offs Are Electrically Operated. A Probe Is Installed In The Boiler Shell Or External Manifold And Is Connected To The Control Unit. Water Is Used As A Conductor To Complete The Circuit Between The Probe And The Boiler Shell. When Water Is In Contact With The Probe The Circuit Is Completed; When The Water Level Drops Below The Probe The Circuit Opens. Hydrolevel Controls Provide Contacts To De-Energize The Burner Circuit In A Low Water Condition.
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