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2
General venting
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 3" Concentric Vent Kit available from Lochinvar (see
Section 3 – Sidewall Termination – Optional Concentric
Vent) and the 3" Concentric Vent Kit available from IPEX
are both approved for use on the Shield water heater. Both
kits are listed to the ULC-S636 standard for use in Canada.
Sizing
The Shield water heater uses model specific combustion air
intake and vent piping sizes as detailed in Table 2A below.
Table 2A Air Intake/Vent Piping Sizes
Model
SNR150-100 -- SNR200-100
SNA285-125 -- SNA500-125
Increasing or decreasing combustion air
NOTICE
or vent piping sizes is not authorized.
(continued)
Air Intake
Vent
3 inches
3 inches
4 inches
4 inches
Installation & Service Manual
TM
Minimum
/
Maximum
combustion air and vent piping lengths
are as follows:
Combustion Air = 12 equivalent feet minimum / 100
equivalent feet maximum
Vent = 12 equivalent feet minimum / 100 equivalent feet
maximum
When determining equivalent combustion air and vent
length, add 5 feet for each 90° elbow and 3 feet for each 45°
elbow.
EXAMPLE: 20 feet of PVC pipe + (4) 90° elbows + (2) 45°
elbows + (1) concentric vent kit (CVK3003) = 49 equivalent
feet of piping.
The appliance output rating will reduce
NOTICE
by up to 1.5% for each 25 feet of vent
length.
Table 2B Concentric Vent Kit Equivalent Vent Lengths
Model
SNR150-100 -- SNR200-100 CVK3003
SNA285-125
SNA400-125
SNA500-125
allowable
Kit
Equivalent
Number
Vent Length
3 feet
CVK3007
3 feet
CVK3007
5 feet
CVK3007
30 feet
17
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