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16) (Steam Boilers) - Verify low water cutoff operation while the boiler is running. Slowly open drain valve and drain
boiler until the water level drops below low water cutoff line. Water still should be visible in the gauge glass
when the low water cutoff shuts down the main burners. The pilot burner and main burners should stop firing.
Make sure pressure limit, thermostat or other controls have not shut off the boiler. Upon test completion refill
the boiler to the normal water level.
17) (Steam Boilers) - Check pressure limit control operation. When steam pressure is registered on pressure gauge,
lower pressure limit setting below gauge reading. The pilot burner and main burners should stop firing. Raise
pressure limit setting above gauge reading. The pilot burner and main burners should relight.
18) (Steam Boilers) - Replacement of a steam boiler tends to break loose accumulated scale from the system. During
the first week of operation, blow down any float type water cut-offs at least three times following the blow down
instructions provided by the low water cut-off manufacturer.
19) (Steam Boilers) - After the new boiler has been installed and put into continuous operation for several days, clean
the boiler of oil, grease, sludge, and other contaminants that may have been present in existing piping. This will
prevent unsteady water line and water carry over into supply main. The boiler boil-out should be done as follows:
a. Turn off gas supply to boiler per the appropriate Lighting and Operating instructions on pages 54 and 55.
b. Drain water from boiler until about one inch of water is visible in gauge glass.
c. Run a hose or temporary piping from the boiler drain valve to a location where hot water can be safely
discharged. Drain approximately five gallons of water from the boiler and mix-in an appropriate amount of an
approved boil-out compound. Refill the boiler with prepared solution through funnel inserted into the surface
skimmer tapping. Run a temporary drain line made of hose or piping from the surface skimmer tapping to a
location where hot water can be safely discharged.
d. Light off the boiler per the appropriate instructions on pages 54 and 55. Run boiler for several hours, boiling
the water, without generating steam pressure. Open the water feed valve sufficiently to allow a slight overflow
of water through the temporary drain line attached to the surface skimmer tapping. Continue boiling until
water coming out is clear.
e. Turn off gas supply to boiler per the appropriate Lighting and Operating instructions on pages 54 and 55.
Drain hot water from boiler through boiler drain valve to a location where hot water can be safely discharged.
Refill the boiler to normal water line level. If water in the gauge glass does not look clear, repeat above boil-
out procedure again until water is clears.
f. Close the surface skimmer tapping.
g. Conduct pH and Alkalinity test of water in the system. The pH reading should be in 7 to 11 range.
20) (All Boilers) - Inspect the vent system for flue gas leaks. Repair any leaks found before leaving the boiler in
operation.
21) (All Boilers) - After the boiler has operated for approximately 30 minutes, check the boiler and heating
system piping for leaks. Repair any leaks found at once.
NOTE
When substantial amount of make-up water is used due to lost condensate, or when make-up water is hard or corrosive,
water treatment is required. Contact qualified water treatment company for recommended water treatment compounds
and procedures.