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Page 14
4.4 Venting (Exhaust)
NOTICE
DO NOT COMMON VENT MASCOT ST UNITS.
Mascot ST units are never permitted to share a
vent with Category I appliances.
The flue temperature of the Mascot ST changes
dramatically with changes in operating water
temperature. Therefore, it is necessary to assess
the application of the water heater to determine
the required certified vent class. If the Mascot ST
is installed in an application where the ambient
temperature is elevated, and/or installed in a closet/
alcove, CPVC, polypropylene, or stainless steel
material is required. If the system temperatures
are unknown at the time of installation, stainless,
polypropylene or CPVC material is recommended.
The Mascot ST is a Category IV appliance and may
be installed with PVC, CPVC or polypropylene that
complies with ULC-S636, ANSI/ASTM D1785 F441
(see
Table 3)
or a stainless steel venting system that
complies with UL 1738 Standard.
WARNING
Use of cellular core PVC (ASTM F891), cellular core
CPVC, or Radel® (polyphenolsulfone) in venting
systems shall be prohibited.
WARNING
Failure to use the appropriate vent material, installation
techniques, glues/sealants could lead to vent failure
causing property damage, personal injury or death.
WARNING
All venting must be installed according to this manual
and any other applicable local codes, including but
not limited to, ANSI Z224.1/NFPA 54, CSA B149.1,
CSAB149.2 and ULC-S636. Failure to follow this manual
and applicable codes may lead to property damage,
severe injury, or death.
MATERIAL
Stainless Steel
PVC, sch 40
CPVC, sch 40
Polypropylene
Table 3.
Required Exhaust Vent Material.
VENTING INSTALLATION STANDARDS
UNITED STATES
UL 1738
ANSI/ASTM D1785
ANSI/ASTM F441
UL1738 or ULC-S636
AVIS
NE PAS ÉVENT COMMUNE MASCOTTE ST UNITÉS.
Mascotte ST unités ne sont jamais autorisés à
partager un évent Catégorie I avec les appareils.
INSTALLATIONS IN CANADA require the use of
venting material certified to ULCS636. All Gas vents
connected to the Mascot ST, plastic, stainless
steel or otherwise must be certified to this ULC
standard. Appropriate selection of vent material is
very important for proper performance and safe
operation of the Mascot ST.
The flue temperature of the Mascot ST changes
dramatically with changes in operating water
temperature. Therefore, it is necessary to assess
the application of the water heater to determine
the required certified vent class. If the Mascot ST
is installed in an application where the outlet water
temperature exceeds 145°F, and/or installed in a
closet, class IIB or higher vent material is required.
If the system temperatures are unknown at the time
of installation, class IIB or higher venting material
is recommended.
IN CANADA all venting used must meet the
following requirements:
1.
ULC-S636 certified and marked
2.
The first 3 feet of venting must be accessible
for visual inspection.
3.
All components used in the vent system must
be from a certified manufacturer.
4 . Vent system components must not be mixed
with alternate manufacturers certified
components and/or unlisted components.
5 . The venting must be installed according to the
vent manufacturers installation instructions.
The unit's vent can terminate through the roof, or
Venting must be ULC-S636 certified for use as
venting material. The venting material must be chosen
based upon the intended application of the water heater.
LAARS Heating Systems
CANADA
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