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A ___ is a burner accessory that opens when energized by contacts in the programmer to allow fuel oil to flow to a burner nozzle.

A boiler must be taken off-line before it can be inspected.

Gate valves offer no restriction to flow when wide open.

Under all circumstances, electrical equipment should never be de-energized before maintenance work is performed.

Under all circumstances, electrical equipment should never be de-energized before maintenance work is performed.

In low pressure steam boilers, the lowest visible part of the gauge glass must be placed a minimum of 1″ above the lowest permissible water level.

Flame failures in gas-fired boilers are commonly caused by ___.

If the stack height is over ___’ or if an extremely large breeching and stack combination causes excessive draft, a damper can be located in the breeching close to the stack.

If the stack height is over ___’ or if an extremely large breeching and stack combination causes excessive draft, a damper can be located in the breeching close to the stack.

A flame scanner proves the main flame only.