Columbia CEG-C, Инструкция по установке, эксплуатации и обслуживанию

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22
MAINTAINING YOUR BOILER
Skimming Off Impurities
• Some of the impurities in the boiler water will
fl oat on the water and must be skimmed off.
• With the boiler empty and cool, slowly begin to
add water. After water has entered boiler - never
before - turn “on” main gas burners and adjust
fl ame at main manual shut-off valve so that the
water being added is kept just below boiling
point. Avoid boiling and turbulence. Gradually
raise hot water level to skimming tee, see
fi gure 1, installed at the supply outlet piping
of the boiler being careful not to raise it above
the opening of the tee. Skim until there are no
impurities. Repeat the process if necessary.
• Water may be checked to make sure it is free
from oil by drawing off a sample at the skimming
tee. If the sample is reasonably free from oil, it
will not froth when boiled on stove. This test does
not indicate the amount of sediment which may
lay in the bottom of the boiler. It is therefore
necessary that the boiler be further cleaned by
“blowing down”.
Blowing Down Boiler
• Before blowing down the boiler, fi ll it to the water
line. Light burners and allow fi ve pounds of steam
pressure to build up. Run a temporary connection
from one of the drain valves to a nearby sewer.
Connect to a drain valve on the opposite end of
the boiler from feed water inlet, if possible. Shut
off the gas burners, open drain valve and blow
down the entire contents of boiler.
• Allow boiler to thoroughly cool and slowly re fi ll
to water line. Repeat step 2 as many times as
required until blow off water is clear. Owner
should blow down boiler at least once each month
of the heating season.
!
WARNING
Water will be boiling hot water.
Using Cleaning Compound
• If an exceptional amount of dirt or sludge seems
to be present in the boiler, a boiler cleaning
compound made by a reputable manufacturer
may be used according to the instructions of the
manufacturer of the compound. When any type of
cleaning compound is used, care must be taken to
thoroughly fl ush all traces of the compound out of
the boiler.
• Following blow down allow the boiler to cool. Add
fresh water slowly. Be certain to blow enough
times as required to remove compounds from
system.
Checking And Adjusting The Gas Ignition
Components
• The gas input to the boiler can be adjusted by
removing the protective cap on the pressure
regulator, see fi gure 8 or 9 , and turning
screw clockwise to increase input and
counterclockwise to decrease input.
• Natural gas manifold pressure should be set
at approximately 3.5 inches water column.
Propane gas manifold pressure should be set at
approximately 10 inches water column.
• Manifold pressure is taken at the pressure tap on
the outlet side of the gas valve, see fi gures 8 and
9.
• Burner ori fi ces should be changed if the fi nal
manifold pressure varies more than plus or
minus 0.3 inch water column from the speci fi ed
pressure.
• To check for proper fl ow of natural gas to
boiler divide the input rate on the rating plate
by heating value of the gas as obtained from
the local gas company. This will determine the
number of cubic feet of gas required per hour.
With all other gas appliances off, determine the
fl ow of gas through the meter for two minutes
and multiply by 30 to get the hourly rate. Make
minor adjustments to the gas input as described
above.
• Primary air adjustment is not necessary,
therefore air shutters are not furnished as
standard equipment. Air shutters can be furnished
on request when required by local codes or
conditions.
• A visual check of the main burners and pilot
fl ames should be made at the start of the heating
season and again at mid-season.
• The main burner fl ame should have a well de fi ned
inner blue mantel with a lighter blue outer
mantel. If the fl ame does not appear this way,
check the burner throats and burner ori fi ces for
lint or dust obstruction. See fi gure 14.
• The pilot fl ame should envelop 3/8 to 1/2 inch
of the tip of the pilot sensor. See fi gure 15.
To adjust the pilot fl ame, remove the pilot
adjustment screw and turn the inner adjustment
screw clockwise to decrease or counterclockwise
to increase pilot fl ame. See fi gures 8 and 9. Be
sure to replace cover screw after adjustment to
prevent possible gas leakage.