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insTallaTion
Venting and Combustion Air Options, continued
1
Category II Requirements
In addition to the SVF boilers Category IV rating
(positive pressure, likely to condense), SVF boilers
are also approved for Category II (negative pressure,
likely to condense)
2
The vent system for a Category II SVF boiler is
considered a designed and engineered vent system
This system should be designed by a professional
while using accepted engineering practices in
accordance to local authority having jurisdiction The
Category II venting option requirements are as follows
3
• Vertical vent termination only
• Must not be installed into an existing common
vent system with other appliances
• Combustion air from the boiler room See Direct
Exhaust Combustion Air opening requirements in
Figure 23, page 36
4
• The vent shall consist of a 3 5 ft length piece of
4" diameter straight pipe directly after the vent or
air adapter, and before any diameter or direction
changes in the vent After at least 3 5 ft of piping,
installer can use a bushing up to an 6" diameter See
Figure 21 for an example See Table 10 for boiler-
specific vent data.
5
• The vent system should be designed so that
the pressure in the vertical vent pipe immediately
following the boiler is between the ranges provided
in Table 10 during all operating conditions (e g ,
High fire, Low Fire).
• Flue gas temperature should not exceed 210°F
6
The boiler will start to reduce the firing rate at a
flue temperature of 200°F, and it will shut down
once it exceeds 210°F. The flue gas temperature
standard is within 20°F and 30°F of the return water
temperature of the boiler If there is the potential for
a wide variation in return water temperatures, the
lowest possible temperature should be used for any
7
calculations
• The Stack/Vent Flow Rate for each individual
boiler model is listed in Table 10. This flow rate
is based on the unit running at 9% CO
maximum flue gas temperature of 200°F. The
values can vary depending on the location of the
8
installation and operating conditions
32
svf
500/600
Figure 21 Category II venting
Table 10
Boiler
Model
SVF 500
SVF 600
*The SVF boiler vent or air connection is sized for 4" DuraVent Fas-N-Seal,
DuraVent PolyPro, PVC, and CPVC venting Installer must provide the correct
adapters or reducers needed to connect to other approved vent manufacturer's
products See Table 8, page 29 for a list of adapters
• A carbon monoxide detector is required in the
boiler room for SVF boilers installed in a Category
and the
II configuration. The carbon monoxide detector
2
must be wired in the same electrical circuit as the
boiler Check your local codes for any additional
requirements of carbon monoxide detectors
series
boiler manual
1
Increase to
Increase to
a maximum
a maximum
6" diameter
6" diameter
for venting
for venting
4" diameter
4" diameter
straight pipe,
straight pipe,
minimum
minimum
3.5 feet height
3.5 feet height
Rating and vent data
Negative pressure
Stack/
maintained at vent
Input
Vent
connection of the
flow rate
boiler
Btuh
Scfm
Inches W C
500,000
105
-0 001 to -0 100
600,000
125
-0 001 to -0 100
230001
Connection/
Minimum
vent diameter
required for
Category II*
6"
6"
550-100-273/0523
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