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6
Boiler Assembly
The combustion air damper opening shall be located as
follows: top louver shall began within 12" of the ceiling
and the bottom louver within 12" of the floor as
prescribed in NFPA 54.
Combustion Air from an Adjacent Room
Where combustion air is to be used from within the
building, air must be provided into the equipment room
through two permanent openings into the interior
building. Each opening must have a minimum free area
of 1 square inch for each 1,000 Btuh of the total input
rating of all fuel burning equipment in the space. The
louvers shall be located as follows: top louver shall start
within 12" of the ceiling and the bottom louver within 12"
of the floor as prescribed in NFPA 54.
Exhaust Vent Systems
Positive-Pressure - The vent system is designed to be
under positive pressure at all firing rates. The minimum
vent size is 14" diameter. Horizontal vent pipe should be
supported at least every 6 feet and vertical vent should
be support to prevent excessive weight on the horizontal
runs.
A WARNING!
Use only an approved vent starter coupling and
approved vent pipe from the same
manufacturer for Buderus SB boilers. Do not
mix components from different systems. The
vent system could fail, causing flue gas spillage,
resulting in severe personal injury or death.
We reserve the right to make any changes due to technical modifications!
22
Permissible Equivalent Venting Length
Configurations for SB735 Boilers
Permissible Equivalent Venting Length
Configurations for SB735 Boilers
Model
790
970
1200
A NOTICE!
Table. 6 Maximum venting length for SB735 boilers
Above lengths represent total equivalent vent
length combining horizontal and vertical runs
and any elbow. For each 45° elbow, deduct 4 ft,
for each 90° elbow, deduct 7 ft.
A positive breeching draft is not to exceed
positive + 0.2 Inches WC.
Condensate Removal
The exhaust vent pipe must be pitched at least ¼" per
foot of length back to the boiler. This will allow
condensate to drain back to the unit to be disposed. Low
spots in the venting where condensate may collect
should be avoided. A plastic hose or PVC drain pipe
may be used to remove discharge to a floor drain. Care
should be taken to avoid kinks and from raising the drain
line above the trap assembly. If the condensate must be
lifted above trap assembly to a drain, it should be drain
into a sump so that it can pump away to a drain.
Buderus Heiztechnik GmbH • http://www.heiztechnik.buderus.de
Boiler Installation and Maintenance Manual SB735 • Issue 10/2003
(in ft)
Nom. Vent
12"
Size
14"
165
14"
130
14"
-
14"
195
180
165
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