14
Cast Iron Condensing Boilers – Installation Manual
Cast Iron Condensing Boilers – Installation Manual
Figure 8 - Vertical Venting with a Metal Chimney System
The vent system should be sloped up toward the
chimney at a minimum rate of
1/4 in/ft
, 2 cm/m.
Always provide a minimum clearance of
6 in
, 152 mm
between single wall vent pipe and any combustible
materials.
Failure to maintain minimum clearances
between vent connectors and any
combustible material can result in a fire
causing extensive property damage, severe
personal injury or death!
Exit cones are favorable when used
to increase the velocity of the flue
gas exiting the stack and, may also
help, in cold climates, to reduce ice
build-up. Exit cone terminations must
be supplied by others, installed per
manufacturer’s instructions, and meet
local and federal code.
generic exit cone
Note:
1) All building
structural
modifications
by others.
2) Firestopping per
local building
codes.
VERTICAL VENT (Optional)
NEGATIVE PRESSURE - CATEGORY II
The KN+ is listed as a Category II appliance when
vented vertically into a listed metal AL294C S.S.
chimney system, Figure 8. The chimney system must
provide a negative pressure of
0.02 to 0.10 in
, 0.51 to
2.5 mm WC at the boiler flue collar with the unit running.
When using a listed metal chimney system
the chimney system manufacturer’s
instructions must be followed.
Multiple boiler vent systems must be
designed and verified by a qualified
professional and stack manufacturer. The
vent system must prevent backflow of
exhaust gas through idle boilers.
When more than one appliance is connected to the same
chimney system the system must be large enough to
safely vent the combined output of all of the appliances.
Table 5 lists the mimimum riser sizes required for the
KN boiler - Category II.
If an appliance using any type of a
mechanical draft system operating under
positive pressure is connected to a chimney
flue, never connect any other appliances to
this flue. Doing so can result in excessive
levels of carbon monoxide which can cause
severe personal injury or death!
Table 5 - Mimimum Riser Connection, Negative
Pressure - Category II
Vent system must be sized per an engineered
system
Vent Connections
Locate the boiler as close to the chimney system as
possible. Use the shortest, straightest vent connector
possible for the installation. If horizontal runs exceed
5 ft
, 1.5 m they must be supported at
3 ft
, 0.9 m
intervals with overhead hangers. Use the appropriate
vent connector of the same diameter as the flue collar
to connect the boiler to a listed metal chimney system.
Follow the chimney system manufacturer’s instructions
for proper assembly.
2 FT [.6 m]
10 FT
[3.1 m]
(IN)
(FT)
[mm]
[m]
Model
Size
Diameter
in
mm
6+
8
203
10+
8
203
16+
10
254
20+
10
254
26+
12
305
30+
12
305
40+
14
356
Summary of Contents for KN Series
Page 45: ...45 Cast Iron Condensing Boilers Installation Manual Figure 24 KN6 10 16 20 26 30 and 40 ...
Page 46: ...46 Cast Iron Condensing Boilers Installation Manual Figure 25 KN6 10 16 20 26 30 and 40 ...
Page 47: ...47 Cast Iron Condensing Boilers Installation Manual Figure 26 Gas Train Drain Pan ...
Page 55: ...55 Cast Iron Condensing Boilers Installation Manual ...
