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1.
INSPECT CHIMNEY - verify chimney construction
conforms with requirements of authority having
jurisdiction or in absence of such requirements ANSI
Z211�1, NFPA 211�
• Boiler must be installed into chimney which has
masonry or metallic chimney liner�
• An unlined chimney will have leaks that will cause
poor chimney performance (NO DRAFT), and could
result in positive pressure in combustion chamber�
• Horizontal portions of venting system should
not exceed 10 feet in length� Horizontal lengths
over 10 feet will have negative effect on chimney
performance�
• Chimney should extend at least 2 feet above any
portion of building within 10 feet� See Figure #16�
It should produce negative draft of �06 to �08 inches
of water column, (W�C�), as measured with draft
gauge between boiler and barometric draft control
while maintaining �02 inch W�C� negative draft in
combustion chamber� See chart "Chimney or Vent
Sizes" for recommended chimney or vent sizes�
• Inadequate draft will cause improper combustion,
resulting in dirty flue ways and high fuel bills.
2.
CONNECT FLUE PIPE - same size as boiler outlet to
chimney, sloping upward continuously toward chimney
approximately ¼" per foot� Bolt or screw joints
together to avoid sag�
If oil fired water heater is vented into same flue
as boiler, provide separate hole into chimney
whenever possible� When not possible, use "Y"
connection in flue pipe, using separate draft
regulator for each unit�
When chimney will not provide adequate draft
to handle input from water heater and boiler
simultaneously, wire units so that only one will
operate at a time, favoring water heater�
9 - VENTING SYSTEM INSPECTION & INSTALLATION
Figure #16
17
P/N 240009735, Rev. G [09/30/2016]
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