When servicing or replacing components, be
absolutely certain that the following conditions are
met:
• Water, gas and electricity are off.
• The boiler is at room temperature.
• There is no pressure in the boiler.
I. Check flueways and burners for cleanliness and clean
if necessary. Use the following procedure if cleaning
is required:
a. Refer to the Operating Instructions in Figures 24
to properly turn off the gas to the boiler.
b. Turn off all electrical power to the boiler.
c. Remove burners and brush gas outlet ports
lightly using a soft bristle brush.
d. Remove the vent pipe from fan adapter, top
jacket panel, flue collector/fan assembly and flue
baffles.
e.
f.
g.
Brush flueways with wire brush.
To the extent possible, inspect inside of vent pipe
for obstructions. Remove or replace as necessary.
Re-install baffles. When replacing the flue
collector/fan assembly, be certain that the blanket
seal between the flue collector and top section
makes a tight seal to prevent leakage of the
products of combustion.
h. Re-install the top jacket panel and vent pipe.
i. Re-install burners.
Figure 27: intermittent Pilot and Main
Burner Flame
PILOT
LAMES
2. inspect entire venting system for corrosion, support
and joint integrity. Repair as necessary, inspect vent
termination for any obstruction that may hinder
proper venting.
3. Check the pilot and main burner flame. See Figure
27. The pilot should provide a steady flame
enveloping 3/8" to 1/2" of the flame sensor. If
required, adjust the pilot as stated in the gas valve
manufacturer's instructions. The main burner flame
inner cone should be approximately 1-1/2" high and
should have a very sharp, blue color characteristic.
31
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