During bottom blowdown, the boiler operator should hold the valve handle until the valve closes.

Heating units are designed to minimize heat loss from a building space.

A solution with a pH greater than ___ is alkaline.

When a flame safeguard programmer sequences burner function, ___ is the period of time during which the pilot and main burner must be lit.

Bypass feeders are commonly used on larger boilers in plants where the load varies and makeup water demand is high.

The combination gas/fuel oil burner has in integral gas burner that allows quick changeover from one fuel to another.

Proper control of draft maintains low combustion efficiency.

Proper control of draft maintains low combustion efficiency.

A furnace can be made hotter by ___.

The amount of draft determines the rate of combustion.