Install Instructions

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IV. Venting A. General Guidelines (continued)
ii. Vertical Roof Venting: Use straight
coupling on vent and two 90° elbows turned
downwards for combustion air as shown in
Figure 7A. and Figure 8).
iii. For Alpine boilers factory build prior to
January 2016, US Boiler provided PVC tees
(3” or 4” as applicable to specic boiler
model) to be used either as vent or air intake
terminals.
For Alpine boilers factory build after
January 2016, US Boiler provides PVC
coupling (2”, 3” or 4” as applicable to
specic boiler model) to be used as vent
terminal and PVC 90° elbow (2”, 3” or 4”
as applicable to specic boiler model) to be
used as air intake terminal.
Both above listed combinations of vent/air
intake terminations are approved/permissible
to use per Intertek Alpine Listing Report No.
3132672CRT-04.
b. Maintain correct clearance and orientation
between vent and combustion air terminals.
i. Space center lines of vent and combustion
air terminals minimum 12 in. (300 mm)
apart. Spacing of more than 12 in. (300
mm) is recommended.
ii. If possible, locate vent and combustion
air terminals on the same wall to prevent
nuisance shutdowns. If not, boiler may
be installed with roof vent terminal and
sidewall combustion air terminal.
iii. When installed on the same wall, locate
vent terminal at same height or higher than
combustion air terminal.
iv. When using tee terminals, do not locate vent
terminal directly above air intake as dripping
condensate may freeze on and block intake.
c. Locate bottom of vent and combustion air
terminals at least 12 in. (300 mm) [18 in. (460
mm) in Canada] above the normal snow line and
at least 12 in. (300 mm) above grade level.
d. Locate vent and combustion air terminals at
least 12 in. (300 mm) from any door, window, or
gravity inlet into the building.
e. Do not install vent terminal directly above
windows or doors.
f. Locate bottom of vent terminal at least 3 ft. (900
mm) above any forced air inlet located within 10
ft. (3.0 m).
g. If window and/or air inlet is within 4 ft. (1.2 m)
of an inside corner, maintain at least 6 ft. (1.8 m)
spacing between terminal and adjoining wall of
inside corner.
h. Locate bottom of vent terminal at least 7 ft. (2.1
m) above a public walkway.
i. Maintain minimum clearance of at least 4 ft.
(1.22 m) [6 ft. (1.83 m) in Canada] horizontally
from, and in no case above or below electric
meters, gas meters, regulators, and relief
equipment.
j. Do not locate the vent terminal under decks or
similar structures.
k. Top terminal must be at least 24 in. (609.6
mm) below ventilated eves, softs and other
overhangs. In no case may the overhang
exceed 48 in. (1219.2 mm). Where permitted
by the authority having jurisdiction and local
experience, the terminal may be located closer
to unventilated softs. The minimum vertical
separation depends upon the depth of the soft.
See Figure 4 for details.
l. Maintain minimum 12 in. (300 mm) horizontal
spacing between vent terminal and a building
corner.
m. Under certain conditions, water in the ue gas
may condense, and possibly freeze, on objects
around the terminal including on the structure
itself. If these objects are subject to damage by
ue gas condensate, they should be moved or
protected.
n. If possible, install the vent and combustion air
terminals on a wall away from the prevailing
wind. Reliable operation of this boiler cannot be
guaranteed if terminals are subjected to winds in
excess of 40 mph (64 km/hr).
o. Do not locate combustion air terminal in areas
that might contain combustion air contaminates,
such as near swimming pools.
p. For multiple boiler installations with horizontal
wall terminals, maintain minimum 12 in. (300
mm) horizontal distance between adjacent boiler
vent terminals. Maintaining greater spacing is
recommended to avoid frost damage to building
surfaces where vent terminations are placed.
q. For multiple boiler installations with vertical
roof terminals, maintain minimum 12 in. (300
mm) horizontal distance between adjacent boiler
vent terminals.