Instruction manual

31
8.2 - Venting
systems
WARNING!!! The vent installation
must be in accordance with Part 7,
Venting of Equipment, of the latest
edition of the National Fuel Gas
Code, ANSI Z223.1/NFPA 54 or
section 7, Venting Systems and Air
Supply for Appliances, of the CAN/
CSA B149.1, Natural Gas and
Propane Installation code or
applicable provisions of the local
building codes. Improper venting
can result in excessive levels of
carbon monoxide which can result
in severe personal injury or death!
WARNING!!! Under certain
operating conditions the
temperature of the boiler’s flue
gases may reach 230
°F, (110 ° C). Use
only the polypropylene vent piping
supplied with the boiler or a vent
system listed by a nationally
recognized testing agency for the
application. Improper venting can
result in excessive levels of carbon
monoxide which can result in
severe personal injury or death!
Horizontal vent runs must be sloped
upwards not less than 1/4 in/ft (21
mm/m), from the boiler to the vent
terminal.
The vent system shall be installed
so as to prevent the accumulation of
condensate. When horizontal vent
runs exceed 5 ft (1.5m), they must
be supported at 3 ft (0.98 m),
intervals with overhead hangers.
Horizontal vent systems shall
terminate at least 4 ft (1.22 m)
below, 4 ft (1.22 m) horizontally
from, and in no case above or below
any door, window or gravity air inlet
into any building. It must not
terminate less than 4 ft (1.22 m)
horizontally from, and in no case
above or below, unless a 4 ft (1.22
m), horizontal distance is
maintained, from electric meters,
gas meters, regulators and relief
equipment and not less than 7 ft
(2.3 m) from any adjacent public
walkway. The bottom of the vent
terminal(s) shall be located at least
5 ft (1.5 m) above the air intake
terminal(s). Avoid terminal locations
likely to be affected by winds,
snowdrifts, people and pets. Item
unique to CANADA: vent system
shall terminate at least 6 ft from
electrical and gas meters.
Due to the high efficiency of the
boiler it may discharge what looks
like white smoke especially when
the outside air temperature is cold.
This is a simply water vapor, a
purely natural phenomenon and not
a reason for concern.
Figure 23 - Relation between Power input and Vent system length
The minimum clearance
measurement between two vent end
terminations of this kind of boilers
shall be not less than 2 ft (0.6 m).
WARNING!!! The exhaust vent and
the air inlet lines (also in the
coaxial version) must be supported
to prevent sagging. To do this, use
a suitable pipe clamp to support
the lines. Pipe clamps shall support
the line every 3 ft (1 m). Pipe clamp
shall be fixed in correspondance of
a wall stud. Improper supporting
can result in excessive levels of
carbon monoxide which can result
in severe personal injury or death!
8.3 - Design of the
venting system
This boiler can be fitted with a very
long venting system. However there is
a relationship between the length of the
venting system and the power input of
the boiler. Figure 23 shows this relation
which and installer must consider
when in the designing stage of the
venting.
The maximum length of the Split 80/
80PP vent system is 300 ft (Air intake
plus flue exhuast).
The maximum length of the concentric
60/100PP system is 70 ft.
Each 45° elbow inserted in the
concentric or split venting system, has
a loss of pressure equivalent to 2.5 ft of
linear pipe.
Each 90° elbow inserted in the
concentric or split venting system, has
a loss of pressure equivalent to 5 ft of
linear pipe.
Boilers model 45WE and 45AE can be
fitted only with coaxial venting system
(see section 10.1)
8 - INSTALLATION - Vent & combustion air