The Modulatic is a once-through waterube boiler
with a positive displacement pump to provide a constant flow of
feedwater. The water by-pass regulator continuously regulates the
amount of feedwater that is sent to the coils in response to changes
in steam pressure. By-passed water is returned to the feedwater
tank.
The servo control changes the amount of fuel and combustion air
in direct proportion to the flow of water being sent to the coils.
90% of the water is converted into steam in the coils. Dry steam
is then produced in the steam separator. The water remaining is
removed by a steam trap..
