Venting Maintenance - A.O. Smith HW 300 Instruction Manual

VENTING MAINTENANCE

It is recommended that the heating surfaces and vent piping of
the boiler be checked every six months for dust, deterioration
and carbon deposits. Remove all soot or other obstructions
from chimney and flue which will retard free draft. Replace any
damaged or deteriorated parts of the venting system.
Qualified servicers should follow this procedure when the boiler's
external heating surfaces and vent pipe need cleaning.
1. Turn off the electrical power (main manual gas shutoff and
pilot valves, if applicable).
Allow boiler parts and vent to cool before disassembly.
2. Remove the boiler draft diverter and vent pipe running to
the chimney.
• Check parts and chimney for obstructions and clean as
necessary.
3. Remove burner from boiler and other metal parts as required
to clean and vacuum the heat exchanger and combustion
coils.
• Refer to parts list supplied with this manual for
disassembly aid.
4. Reinstall the parts removed in steps 2 and 3.
• Be sure the vent pipe has a minimum upward pitch
of one quarter inch per foot of length (21 mm/m) and is
sealed as necessary.
5. Restore electrical power and gas supply to boiler.
• Place boiler in operation by following the lighting
instructions in this manual.
• Check for gas leaks and proper boiler and vent
operation.
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