17
3
General
venting
(continued)
Installation & Operation Manual
Requirements for installation in
Canada
1. Installations must be made with a vent pipe system
certified to ULC-S636.
2. The first three (3) feet of plastic vent pipe from the
appliance flue outlet must be readily accessible for visual
inspection.
3. The components of the certified vent system must not be
interchanged with other vent systems or unlisted
pipe/fittings. For concentric vent installations, the inner
vent tube must be replaced with field supplied certified vent
material to comply with this requirement.
4. The 4" Concentric Vent Kit available from Lochinvar (see
Section 4 –
Sidewall Termination – Optional Concentric
Vent
) and the 4" Concentric Vent Kit available from IPEX
are both approved for use on the Knight XL (400 - 500
models only) boiler. Both kits are listed to the ULC-S636
standard for use in Canada.
Sizing
Increasing or decreasing combustion air
or vent piping sizes is not authorized.
NOTICE
Model
Air Intake
Vent
400 - 500
4 inches (102 mm)
4 inches (102 mm)
650 - 800
4 inches (102 mm)
6 inches (152 mm)
1000
6 inches (152 mm)
6 inches (152 mm)
The Knight XL uses model specific combustion air intake and
vent piping sizes as detailed in Table 3A below.
Table 3A
Air Intake/Vent Piping Sizes
Model
Kit Number
Equivalent
Vent Length
400
100140484
30 Feet (9 m)
500
100140484
30 Feet (9 m)
Table 3B
Concentric Vent Kit
Equivalent Vent Lengths
Minimum
/
Maximum
allowable
combustion air and vent piping lengths
are as follows:
Combustion Air
= 12 equivalent feet (3.7 m) minimum / 150
equivalent feet (30.5 m) maximum
Vent
= 12 equivalent feet (3.7 m) minimum / 150 equivalent
feet (30.5 m) maximum
When determining equivalent combustion air and vent
length, add 5 feet (1.5m) for each 90° elbow and 3 feet (.9 m)
for each 45° elbow.
EXAMPLE:
20 feet (6 m) of PVC pipe + (3) 90°
(3) 45° (1) concentric vent kit (100140484) = 49
equivalent feet (15 m) of piping.
Model
Air Inlet
Vent
Input De-Rate
per 25 Feet
of Vent
Air Intake
Diameter
Air Intake Min.
Length
Air Intake Max.
Length
Vent Diameter
Vent Min.
Length
Vent Max.
Length
400
4"
12'
150'
4"
12'
150'
0.78%
500
4"
12'
150'
4"
12'
150'
0.83%
650N*
4
"
12'
80'
4"
12'
80'
0.29%
650L*
4
"
12'
30'
4"
12'
30'
0.81%
650
4"
12'
150'
6"
12'
150'
2.00%
650
6"
12'
150'
6"
12'
150'
0.60%
800
4
"
12
'
100
'
6
"
12
'
100
'
0.63%
800
6"
12'
150'
6"
12'
150'
0.38%
1000
6"
12'
150'
6"
12'
150'
1.00%
*When using 4” vent for the 650 model, the allowable vent length for propane models is different from the allowable vent length for natural
gas models.
Model
Vent
Input De-Rate
per 25 Feet
of Vent
Vent
Diameter
Vent Min.
Length
Vent Max.
Length
400
4"
12'
150'
0.56%
500
4"
12'
150'
0.50%
650N*
4
"
12'
80'
0.30%
650L*
4
"
12'
30'
0.82%
650
6"
12'
150'
0.10%
800
6"
12'
150'
0.50%
1000
6"
12'
150'
0.66%
*When using 4” vent for the 650 model, the allowable vent length for
propane models is different from the allowable vent length for natural
gas models.
Table 3D
Direct Vent Minimum/Maximum Allowable Air/Vent Lengths
Table 3C
Room Air Minimum/Maximum Allowable Vent
Lengths
