UTICA BOILERS UB90125 Installation, Operation And Maintanance Manual page 7

5. Equipment shall be installed in a location which fa-
cilitates the operation of venting and combustion air
intake piping systems as described in this manual.
6. Advise owner of boiler to keep venting and combus-
tion air intake passages free of obstructions. Both
the venting and combustion air intake piping sys-
tems connected to the outdoors must permit flow
through the piping systems without restrictions for
the boiler to operate.
7. The boiler shall be installed such that the automatic
gas ignition system components are protected from
water (dripping, spraying, rain, etc.) during opera-
tion and service (circulator replacement, control
replacement, etc.).
8. The boiler must be located where ambient tempera-
tures (minimum possible room temperatures where
boiler is installed assuming boiler is not in opera-
tion and therefore contributes no heat to the space)
are always at or above 32°F to prevent freezing of
liquid condensate.
coMBustIon aIR/VEnt pIpE REQuIREMEnts
This boiler requires a dedicated direct vent system.
In a direct vent system, all air for combustion is taken
directly from outside atmosphere, and all flue products
are discharged to outside atmosphere.
RooF VEnt / IntaKE tERMInatIons
8" MINIMUM
VERTICAL SEPARATION
BETWEEN COMBUSTION
AIR INTAKE AND VENT
MAINTAIN 12" MINIMUM
CLEARANCE ABOVE HIGHEST
ANTICIPATED SNOW LEVEL
Combustion air and vent pipe connections must termi-
nate together in the same atmospheric pressure zone,
either through the roof or sidewall (roof termination
preferred). See Figures #1 and #2 for required clear-
ances.
V. BeFore iNstalliNg tHe Boiler
Figure #1
15'' MAXIMUM
3'' MAXIMUM
SEPARATION
sIdEWall VEnt/IntaKE tERMInatIons
If the concentric vent termination is being used, refer
to Figure #3 for proper setup.
concEntRIc VEnt tERMInatIons
12''
MIMIMUM
COMBUSTION
AIR
7
Figure #2
12"
MINIMUM
12"
MINIMUM
VENT
less than 12" clearance
MAXIMUM
OVERHANG
SEPARATION
12"
12" MINIMUM
MINIMUM
18"
VENT
MAXIMUM
12"
MINIMUM
90°
LESS THAN 12" CLEARANCE
BRACKET
3"
MAXIMUM
SEPARATION
12" or More clearance
18"
MAXIMUM
12" OR MORE CLEARANCE
Figure #3
OVERHANG
12" MINIMUM
90°
3"
15"
MAXIMUM
12" SEPARATION
BETWEEN BOTTOM OF
COMBUSTION AIR INTAKE
AND BOTTOM OF VENT
MAINTAIN 12" MINIMUM
CLEARANCE ABOVE HIGHES
ANTICIPATED SNOW LEVEL
GRADE