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drop the pressure setting until the boiler shuts down. This
will show that the pressure limit is operating properly
Refer to control manufacturer's instructions (enclosed} for
more information.
Check thermostat operation. When set above temperature
indicated on the thermometer, boiler should ignite. Make
certain the thermostat turns off the boiler when room
temperature reaches the selected setting and starts the boiler
operating when room temperature falls a few degrees.
Finally, set the thermostat for the desired temperature. Special
conditions in your home and the location of the thermostat
will govern this setting.
It is very important to clean a new steam boiler after it has
3/8" to 1/2"
been installed and put into continuous operation. This must
be done to remove any accumulation of oil, grease, sludge,
etc., that may have been present in the system. These
substances may cause the boiler water to foam and surge,
thus producing a very unsteady water line, throwing water
into the steam header, and possibly preventing steam
generation. Follow these steps in order to remove these
contaminants.
SKIMMING AND BLOWDOWN
New boilers must be skimmed at the time of installation to
remove threading oil and other impurities that float on the
surface of the water.
1. Remove the plug from the skimmer tapping and pipe to
a floor drain or bucket.
2. Raise the water level to the skimmer tapping.
3. Fire the boiler to maintain a water temperature of 180-
200 degrees.
4. Feed water to the boiler to maintain the water level. Adjust
the water feed rate to keep water continuously flowing
out of the skimmer tapping without the water level going
above or falling below the tapping. Cycle the burners to
prevent boiling.
5. Continue skimming until the water runs clear. This may
take several hours.
6. Float type low water cut offs must be blown down after
skimming. The float chamber of the low water cut off must
be flushed clean and maintained clear of sediment to allow
free movement of the float: This must be done frequently
during initial operation of the boiler, and at least once
a week thereafter. Follow the instructions on the tag
attached to the control.
Probe type low water cut offs require no maintenance
at this time.
7. After blowing down the low water cut off and before
blowing down the boiler, fill the boiler to the water line.
Fire the burners and allow normal steam pressure to build
up. Run a connection from the boiler blowdown valve to
a nearby sewer or floor drain or to a safe discharge point
outside. Shut off the gas burners, open the blowdown
valve, and allow all of the water in the boiler to drain out.
Close the b!owdown valve. Allow the boiler to cool
thoroughly and then slowly refill the boiler to the water
line. Repeat this step as many times as necessary until
the blowdown water is clear.
.
Following the final blow down, allow the boiler to thoroughly
cool, and then add fresh water slowly up to the normal
water line. Start the burners and maintain at least 180
degrees for 15 minutes to remove dissolved gasses from
the fresh water. Shut off burners.
Now, let the boiler steam for a few days, to give the majority
of the system dirt a chance to work its way back to the boiler.
Then check the water in the gauge glass. The gauge glass
should be dry above the water line. The water line should
not bounce more than one inch when the boiler is steaming.
If you see water droplets carrying over from the top of the
gauge glass, or excessive bouncing of the water line, the
boiler needs further cleaning. Take a water sample and boil
it on the stove, to see if it foams. If it does, this also indicates
the boiler needs to be cleaned.
If cleaning is necessary, repeat the skimming and blow down
procedure from above. Usually a long skim will be all you
need to clean the boiler.
In more troublesome cases it may be desirable to flush the
system as well. This is accomplished by closing the gate
valve in the Hartford Loop, and opening the drain(s) at the
end of the wet return(s). Run a hose from the drain valve
on the wet return to a nearby floor drain or bucket. Run
the boiler at two pounds of steam pressure. Feed just enough
water to compensate for the waste condensate going down
the drain, and to keep the boiler from going off on low water
cut off. Run the boiler until all waste condensate runs clear.
NOTE
Boiler cleaners and chemical cleaning additives are not
recommended. If used and not rinsed properly, they
will do more harm than good. The cleaning procedures
laid out above will clean out the typical oilsand impurities
found in new boilers and in residential heating systems.
The best thing for your boiler and heating system is
clean water with no additives.
In very extreme cases it may be necessary to chemically
clean and flush the heating system. Consult the boiler manu-
facturer before introducing any chemicals into the boiler.
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