A.O. Smith Boiler VB/VW- 750 User Manual

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17
VENTING SUPPORTS
Care must be taken in the installation of the venting system that
adequate support is maintained throughout the installation process.
Whenextendingmorethan10feet(3.0m)vertically,verticalsupport
kitsarerequiredonceevery10feet(3.0m)ofverticalrun.Vertical
supportisalsorequiredimmediatelyafteranytransition(elbow,
tee,etc.)toverticalofover10feet(3.0m)ofrunandafterany
offset in the vertical run.
Thesupportbrackets(suppliedintheVerticalSupportKit)aretobe
secure ly fastened to a solid vertical member of the building using the
appropriate fasteners; i.e., wood screws for wood framing, machine or
tapping screws for structural steel or masonry anchors for solid masonry.
The bracket should be located so that it will not interfere with any joints of
the venting system. The bottom most support bracket should be located
directlyabovethersttransitionfromhorizontaltovertical,seeFigure
10. Refer to Figures 12, 12A, 12B and 12C.
If a means of support for the brackets are not available and
horizontal vent sections are present, install hanger straps
(madefromnon-combustiblematerial)asclosetothepointsof
transition as possible. If the horizontal portions of the vent and/or
ventconnectorarelongerthan6feet(2.0m),theninstallhanger
strapsevery6feet(2.0m)tosupporttheconnector.
DO NOT rivet or screw the straps to the conduit or other wise
puncture the conduit wall. Instead, wrap an extra loop of strap
around the conduit to hold it in position, or attach the strap to
the center screw of the double wall AL 29-4C
®
vent coupling, if
applica ble.
VERTICAL INSTALLATION REQUIREMENTS
1.The vent system must terminate at least 3 feet (1.0m)
andno morethan6feet (2.0m)abovetheroof lineand
no closer than 10 feet (3.0m) from any wall or vertical
structure. If the exhaust vent terminal is within 10 feet
(3.0m)ofawallorparapet,itmustextendaminimumof
2feet (610mm)abovethe wallorparapet, seeFigures
11 and 12A.
2. For direct vent installations, the total distance of the vent system
from the boiler vent connector to the vertical vent termination shall
notexceed70equivalentfeet(21.3m).Amaximumofthree90°
elbows can be used. Minimum vertical vent is 7 equivalent feet
(2.1m)fordirectventinstallations.Standardminimumverticalvent
lengthis7feet(2.1m),plusBoot-Tee.SeeFigures11,12A,12B,and
12C for differences between standard and direct vent installations.
3. An AL 29-C
®
Vent Vertical Vent Terminal must be used at
the termina tion.
4.Maintainaminimumof6feet(2.0m)separationbetween
the air intake and the exhaust terminals.
HORIZONTAL INSTALLTION REQUIREMENTS
1. The vent system must terminate with a AL 29-4C
®
Vent
Through-the-Wall Termination (TWT). Plan the terminal
location based on the dimensions shown in Figure 9. Do
not locatethe terminal within 8feet (2.5m) ofan inside
corner of a building or adjacent to outside walls, shrubs or
other such objects that may cause adverse wind conditions
in the immediate area.
2.TheTWTshallbelocatednotlessthan12inches(305mm)
above grade or, in geographical areas where snow
accumulates,nolessthan12inches(305mm)abovethe
antici pated snow line. Ensure that the TWT is protected
against blockage which may occur during ice build up or
snowstorms.
The TWT shall terminate at least 3 feet (1.0m) above
any forced airinlet within 10 feet(3.0m), except when
the forced air inlet is the combustion air intake of a
direct vent appliance. The TWT shall terminate at least
4feet (1.2m)below, 4feet(1.2m)horizontally fromor
1 foot (305mm) above any door, window or gravity air
inlet into any building as provided in the current edition
of the NATION AL FUEL GAS CODE ANSI Z223.1, see
Figure 9.
In addition, a minimum clearance of 4 feet (1.2m) hori-
zontally from, and in NO CASE ABOVE OR BELOW,
unless the 4 feet (1.2m) of horizontal distance is main-
tained from electric meters, gas meters, regulators and
relief equipment.
3. This horizontal exhaust vent system must pitch upward toward
theterminationat1/4inchperfoot(21mmpermeter).
4. The TWT is designed such that the building is protected
from degradation by flue gas and condensate. Howev er,
if additional protection is desired, install against the wall
a non-corrosive metal sheet under the TWT.
5. Due to the normal formation of water vapor in the combus-
tion process, horizon tal terminations must not be located
over areasof pedestrian orvehicular traffic,(i.e., public
walkways or over areas where condensate could create
a nuisance or hazard). This is especially true in colder
climates where ice buildup is likely to occur. A.O. Smith
Corporation will not be held liable for any personal injury
or property damage due to any dislodg ing of ice.

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