Blodgett SB-16SC - Manual (Page 12)

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4.0 PERIODIC MAINTENANCE
CAUTION: Protect yourself. When flushing control, hot water
and steam will flow out of the drain.
Be sure to flush your boiler water level control daily. Failure to follow this procedure can
cause the control to malfunction resulting in serious boiler damage.
The Boiler Water Level Control installed on your boiler requires periodic maintenance.
As boiler water circulates into the float chamber, sand, scale and other sediment may be
deposited in the float chamber. While the chamber has been designed with a large
accumulation bowl, it is necessary to flush the sediment from the chamber by blowing
down the control so that the accumulation of sediment does not interfere with the
movement of the float in the control. Control must be flushed at least once a day.
When flushing control, note water level in gauge glass, allow the boiler to fill if
necessary, and also to come up to temperature.
Before flushing control, note that water level in gauge glass is within operating range and
the boiler pressure is at least 6 psi. While the boiler is being operated, open blowdown
valve at bottom of control by rotating the handle counterclockwise about 1/4 turn to fully
open the valve. Opening the blowdown valve also checks the cut-off operation. Float
should drop shutting steam off, hot water and steam will flow out the drain flushing away
sediment.
CAUTION: If steam supply does not shut off during blowdown,
immediately discontinue use of appliance and call for service.