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3 General venting (continued)
Removing from existing vent
Follow the instructions in Section 1, page 11 of this manual
when removing a boiler from an existing vent system.
Vent and air piping
Vent and air system:
Installation must comply with local
requirements and with the National Fuel Gas
Code, ANSI Z223.1 for U.S. installations or
CSA B149.1 for Canadian installations.
You must also install air piping from outside to the boiler air
intake adapter. The resultant installation is direct vent (sealed
combustion).
You may use any of the vent/air piping methods covered in this
manual. Do not attempt to install the Knight wall mount boiler
using any other means.
NOTICE
ƽ WARNING
VENT
3" S.S. INTERMEDIATE
(FOR SAF-T VENT ONLY)
3" S.S. ADAPTER
Figure 3-10 Near Boiler Stainless Steel Venting
Stainless steel air intake/vent
connections
1. Combustion Air Intake Connector (FIG. 3-10) - Used
to provide combustion air directly to the unit from
outdoors. A fitting is provided on the unit for final
connection. Combustion air piping must be supported
per guidelines listed in the National Mechanical Code,
Section 305, Table 305.4 or as local codes dictate.
2. Vent Connector (FIG. 3-10) - Used to provide a
passageway for conveying combustion gases to the
outside. A transition fitting is provided on the unit for
final connection. Vent piping must be supported per the
National Building Code, Section 305, Table 305.4 or as
local codes dictate.
Maximum allowable combustion air and
vent piping lengths are as follows:
Model 2" Max Vent/Air 3" Max Vent/Air
51 40 feet 100 feet
81 40 feet 100 feet
106 40 feet 100 feet
151 N/A 100 feet
211 N/A 100 feet
Increasing or decreasing the size of the
combustion air or vent piping beyond the
sizes listed in Table 3C is not authorized.
NOTICE
When determining equivalent combustion air and vent length,
add 5 feet for each 90° elbow, 3 feet for each 45° elbow, and 3 feet
for the concentric vent kit, see example below.
EXAMPLE: 20 feet of PVC pipe + (4) 90° elbows + (2) 45°
elbows + (1) concentric vent kit = 49 equivalent feet of piping.
Table 3C Maximum Combustion Air and Vent Piping
Lengths
Note: The minimum combustion air and vent piping length is
12 equivalent feet.
For 2" vent / air lengths greater than 40 feet,
consult the factory.
NOTICE
The Knight wall mount boiler uses model specific
combustion air intake and vent piping sizes as detailed in
Table 3C below.
Vent, air piping and termination:
The Knight wall mount boiler vent and air piping can be
installed through the roof or through a sidewall. Follow the
procedures in this manual for the method chosen. Refer to the
information in this manual to determine acceptable vent and air
piping length.
DO NOT mix components from different
systems. The vent system could fail, causing
leakage of flue products into the living space.
Use only approved stainless steel, PVC or
CPVC pipe and fittings. For PVC/CPVC use
with primer and cement specifically
designed for the material used.
19
Installation & Operation Manual