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4
Venting
(continued)
Les chaudières de catégories I, II et IV
doivent présenter des tronçons horizontaux
dont la pente montante est d'au moins 1/4
po par pied (21 mm/m) entre la chaudière et
l'évent.
e. If possible, slope horizontal combustion
air pipe minimum 1/4 in/ft. (21 mm/m)
downward towards terminal. If not, slope
towards boiler.
f. Use noncombustible ¾ in. pipe strap to
support horizontal runs and maintain vent
location and slope while preventing sags
in pipe. Do not restrict thermal expansion
or movement of vent system. Maximum
support spacing 4 ft. (1.2 m). Avoid low
spots where condensate may pool. Do not
penetrate any part of the vent system with
fasteners.
Les instructions d´installation du système
d´évacuation doivent préciser que
les sections horizontales doivent être
supportées pour prévenir le fléchissement.
Les méthodes et les intervalles de support
doivent être spécifiés. Les instructions
divent aussi indiquer les renseignements
suivants:
les chaudières de catégories II et IV
doivent être installées de façon à empêcher
l´accumulation de condensat: et
si nécessaire, les chaudières de catégories
II et IV doivent être pourvues de dispositifs
d´évacuation du condensat.
18
Figure 4-6: Direct Vent - Sidewall Standard Terminations
APEX
Installation, Operating, & Service Instructions
g. For multiple boiler installations with vertical
roof terminals, separate vent pipes from
multiple boilers may be piped through a
common conduit or chase so that one roof
penetration may be made.
3. Vent/Combustion Air Terminals
Install venting system components on exterior of
building only as specifically required by these
instructions (refer to Figure 4-5).
a. Use only listed vent/combustion air
terminals.
i.
Horizontal Sidewall Venting: Use
coupling for vent and 90° elbow pointed
down for combustion air as shown in
Figure 4-6 or Figure 4-7. If using room
air for combustion, use 90° elbow or tee
for vent. Alternate low profile termination
is shown in Figure 4-8.
ii.
Vertical Roof Venting: Use coupling
on vent and two 90° elbows turned
downwards for combustion air as shown
in Figure 4-9 and Figure 4-10.
b. Maintain correct clearance and orientation
between vent and combustion air terminals.
i.
Space centerlines of vent and
combustion air terminals minimum 12
in. (300 mm) apart. 36 in. (915 mm)
spacing is recommended.
ii.
If possible, locate vent and combustion
air terminals on the same wall to prevent
106308-05 - 3/23
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