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Finned copper tube gas boilers & water heaters – Boiler Manual
5
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CHIMNEY & VENT PIPE CONNECTIONS
Th e vent installation must be in accordance with Part
7, Venting of Equipment, of the latest revision of the
National Fuel Gas Code, ANSI Z223.1/NFPA 54 or
applicable provisions of the local building codes.
Canadian installations must comply with CSA B149.1
or .2 Installation Code. Improper venting can result
in excessive levels of carbon monoxide which can result
in severe personal injury or death!
Chimney Inspection & Sizing
A thorough inspection of the masonry chimney must be
performed to ensure that the chimney is clean, properly constructed,
lined and sized. Exterior masonry chimneys should not be used
unless properly lined to prevent condensation and draft problems.
Table 4 lists the equivalent breeching and fl ue sizes required for
the boiler/water heater.
Table 4
Equivalent Breeching and Chimney Size
Model
Size
Size
in
Size
mm
100
5
127
150
6
152
200
7
178
250
8
203
300
8
203
350
9
229
400
10
254
Note: These sizes are based on a
20 ft
,
6.1 m
chimney height.
When more than one appliance is connected to the same chimney
fl ue, the fl ue must be large enough to safely vent the combined
output of all the appliances.
If an appliance using any type of a mechanical draft
system operating under positive pressure is connected
to a chimney fl ue, never connect any other appliances
to this fl ue. Doing so can result in the accumulation
of carbon monoxide which can cause severe personal
injury or death!
Vent Connections
Always use a type B or single wall galvanized metal vent
pipe the same diameter as the draft hood fl ue collar, Table 4. Use
the shortest, straightest vent system possible for the installation. If
horizontal runs exceed
6 ft
,
1.8 m
they must be supported at
6 ft
,
1.8 m
intervals with overhead hangers. Th e vent system should be
sloped up toward the chimney at a minimum rate of
1/4 in/ft
,
20 mm/m
and terminate fl ush with the inside of the chimney fl ue.
Fasten each connection with at least 3 corrosion resistant sheet
metal screws.
Never modify or alter any part of the boiler’s draft
hood. Th is includes the removal or alteration of any
baffl es. Never install a vent pipe of a diameter diff erent
than that of the boiler draft hood fl ue collar. Failure
to comply with this warning can result in severe
personal injury or death!
Always provide a minimum clearance of
6 in
,
152 mm
between
type C vent pipe and any combustible materials. Type B1 vent may
be used, clearance between it and any combustible material must
be as listed.
Failure to maintain minimum clearances between vent
connectors and any combustible material can result
in a fi re causing extensive property damage, severe
personal injury or death!
To determine the appropriate power venter for the boiler/water
heater, see Table 5, Power Venter Sizes. Follow the power venter
manufacturer’s installation instructions.
Table 5
Power Venter Sizes
Spectrum Power
Venter
Max. Pipe Length
Model
Model
ft
mm
100-250
HS-1
100
31
300-400
HS-2
100
31
COMMON VENT SYSTEMS
If an existing boiler/water heater is removed from a
common venting system, the common venting system may then
be too large for the proper venting of the remaining appliances
connected to it. At the time of removal of an existing boiler/water
heater, the following steps shall be followed with each appliance
remaining connected to the common venting system placed in
operation, while the other appliances remaining connected to the
common venting system are not in operation.
Au moment du retrait d’une chaudière existante, les mesures suivantes
doivent être prises pour chaque appareil toujours raccordé au système
d’évacuation commun et qui fonctionne alors que d’autres appareils
toujours raccordés au système d’évacuation ne fonctionnent pas:
système d’évacuation.
a) Seal any unused openings in the common venting system.
Sceller toutes les ouvertures non utilisées du sys-tème d’évacuation.
b) Visually inspect the venting system for proper size and horizontal
pitch and determine there is no blockage or restriction, leakage,
corrosion and other defi ciencies which could cause an unsafe
condition.
Inspecter de façon visuelle le système d’évacuation pour
déterminer la grosser et l’inclinaison horizontale qui conviennent
et s’assurer que le système est ex-empt d’obstruction,
d’étranglement de fruite, de corrosion et autres défaillances qui
pourraient présenter des risques.
