Chimney And Chimney Connections - Lennox COWB3 Installation Instructions Manual

For oil fired boilers for connections to vents or chimneys,
vent installations shall be in accordance with requirements
of authority having jurisdiction, or in the absence of such
requirements
• United States. NFPA 31: Installation of Oil Burning
Equipment
• Canada. CSA B139: Installation of Oil Burning
Equipment
NOTICE
Fresh air (ventilation) is important to proper
venting. Ventilation and venting are two parts of the
same system. Inadequate ventilation will result in
inadequate venting. Always be sure to have enough
ventilation to support proper venting.
Inspect chimney. Verify construction in accordance with
requirements of authority having jurisdiction, or in the ab-
sence of such requirements
• United States. ANSI/NFPA 211: National Standard for
Chimneys, Fireplaces, Vents and Solid Fuel Burning
Appliances.
• Canada. National Building Code of Canada, or CAN/
BSA A405.
FIRING RATE
(gph)
0.60 1.30
1.31 1.80
1.81 1.75
For elevations above 2,000 feet above sea level, add 3 feet to the chimney heights.

CHIMNEY AND CHIMNEY CONNECTIONS

RECOMMENDED MINIMUM CHIMNEY SIZES
CHIMNEY NOMINAL
HEIGHT (ft) CHIMNEY
15 8" x 8"
15 8" x 8"
20 8" x 8"
!
WARNING
Fire Hazard. Maintain minimum vent pipe clearance
of 18" from surface of vent to wood and other
combustible materials. Failure to comply may result
in death or serious injury.
Chimney Connector And Draft Regulator
• Venting the boiler requires 6" diameter chimney con-
nector pipe and use of manufacturer provided draft
regulator.
• Regulator, when properly installed, automatically con-
trols the draft.
• Install in horizontal section of pipe, may also be in-
stalled in angled or vertical section of pipe.
• Verify "top" of regulator is at the top and short pipe
section which holds the vane is horizontal.
• Even though locating draft regulator close to chimney
reduces noise, install draft regulator as close as
practicable to the boiler.
• Install chimney connector, start at boiler with vertical
pipe, elbow, then install draft regulator horizontally.
• When regulator is in place, start at chimney and work
back to the regulator.
• Join the two sections with draw-band.
• Horizontal pipe must slope up toward the chimney at
least 1/4 inch per linear foot of venting.
• Chimney connector must not leak and must be firmly
supported.
• Join each section with at least two sheet metal screws.
Support every second section with a stovepipe wire.
• Install Vent Safety Switch. Follow instructions included
with kit. See Figure 12.
ROUND
LINER INSIDE
6"
7"
8"
16
SQUARE
LINER INSIDE
6 ¾" x 6 ¾"
6 ¾" x 6 ¾"
6 ¾" x 6 ¾"