Install Instructions

17
2 General venting (continued)
Installation & Service 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 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.
Minimum / Maximum allowable
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
The appliance output rating will reduce
by up to 1.5% for each 25 feet of vent
length, except when using the alternative
3" vent for the Shield 286-125 model
which may de-rate by up to 4% for each
25 feet of vent length.
NOTICE
Table 2B Concentric Vent Kit Equivalent Vent Lengths
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
NOTICE
Model Air Intake Vent
126-065 -- 201-100 3 inches 3 inches
286-125 -- 501-125 4 inches 4 inches
Model
Kit
Number
Equivalent
Vent Length
126-065 -- 201-100 CVK3003 3 feet
286-125 CVK3007 3 feet
401-125 CVK3007 5 feet
501-125 CVK3007 30 feet
Increasing or decreasing combustion air
or vent piping sizes is not authorized.
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.
When using the alternative 3" vent and
combustion air piping with a Shield
286-125 model, the maximum allowable
combustion air and vent piping lengths
are limited to 60 equivalent feet each.
The minimum allowable combustion
air and vent pipe lengths remain 12
equivalent feet each.
NOTICE