Dunkirk Q90-200 Installation, Operation & Maintenance Manual page 7

Advise owner of boiler to keep venting and combustion
6.
air intake passages free of obstructions. Both venting
and combustion air intake piping systems connected
to outdoors must permit fl ow through piping systems
without restrictions for boiler to operate.
Boiler shall be installed such that automatic gas
7.
ignition system components are protected from water
(dripping, spraying, rain, etc.) during operation and
service (circulator replacement, condensate trap,
control replacement, etc.).
Boiler must be located where ambient temperatures
8.
(minimum possible room temperatures where boiler
is installed assuming boiler is not in operation and
therefore contributes no heat to space) are always
at or above 32°F (0°C) to prevent freezing of liquid
condensate.
Combustion Air/Vent Pipe Requirements
Boiler requires dedicated direct vent system. In direct vent
system, all air for combustion is taken directly from outside
atmosphere, and all fl ue products are discharged to outside
atmosphere.
Combustion air and vent pipe connections must terminate
together in same atmospheric pressure zone, either
through roof or sidewall (roof termination preferred). See
Figures #1 and #2 for required clearances.
Figure 1 - Roof Vent / Intake Terminations
BEFORE INSTALLING THE BOILER
Figure 2 - Sidewall Vent/Intake Terminations
If concentric vent termination is being used, refer to
Figure #3 for proper setup.
Figure 3 - Concentric Vent Terminations
7
OVERHANG
12" MINIMUM
12"
MINIMUM
12"
MINIMUM
90°
VENT
3"
MAXIMUM
SEPARATION
15"
MAXIMUM
18"
MAXIMUM
Less Than 12" Clearance
LESS THAN 12" CLEARANCE
OVERHANG
12"
12" MINIMUM
MINIMUM
VENT
12"
12" SEPARATION
MINIMUM
BETWEEN BOTTOM OF
90°
COMBUSTION AIR INTAKE
BRACKET AND BOTTOM OF VENT
3" MAINTAIN 12" MINIMUM
CLEARANCE ABOVE HIGHEST
MAXIMUM
ANTICIPATED SNOW LEVEL OR
SEPARATION
GRADE
18"
MAXIMUM
12" or More Clearance
12" OR MORE CLEARANCE
12" SEPARATION
BETWEEN BOTTOM OF
COMBUSTION AIR INTAKE
AND BOTTOM OF VENT
MAINTAIN 12" MINIMUM
CLEARANCE ABOVE HIGHEST
ANTICIPATED SNOW LEVEL OR
GRADE