With high-efficiency condensing boilers, the stack temperature may be as low as ___°F.

The ASME Boiler and Pressure Vessel Code allows ___ valve(s) to be placed between a boiler and a safety valve or between a safety valve and the point of discharge.

Return steam traps discharge condensate directly back to the boiler.

To prevent air pressure from building up in a boiler when filling it with water, the ___ must be open.

A low water condition is caused by an excessive amount of water in a boiler as indicated by the gauge glass.

The internal mechanism of a low water fuel cutoff should be removed from the bowl at the recommended intervals to check and ___ the float ball.

The ASME Boiler and Pressure Vessel Code allows ___ valve(s) to be placed between a boiler and a safety valve or between a safety valve and the point of discharge.

___ are pollution standards for six priority pollutants set by the Environmental Protection Agency through the Clean Air Act.

A variable-speed drive (VSD) is a motor controller used to vary the frequency of the electrical signal supplied to an AC motor in order to control its rotational speed.

___ states, “The training requirements contained in this section apply to employees who face a risk of electric shock that is not reduced to a safe level by the electrical installation.”