LAARS Heating Systems
Page 14
All installations must be done following the vent
supplier’s recommended installation techniques. If
these are not available, refer to the Manufacturer
recommendations for the material used.
NOTE: For Category II and IV boilers, the
horizontal runs must be sloping upwards not less
than 1/4 inch per foot (21 mm/m) from the boiler to
the vent terminal, so as to prevent accumulation
of condensate and, where necessary, have the
means provided for drainage of condensate.
ATTENTION: Pour la catégorie II & IV, les
chaudières ont horizontal en pente vers le haut au
moins 1/4 de pouce par pied (21 mm/m) à partir
de la chaudière pour l’évent borne; être installé
de façon à éviter l’accumulation de condensats;
et, le cas échéant, ont des moyens prévus pour
l’évacuation des condensats.
The venting must be correct to allow the condensate
to run back to the unit to drain. Route the vent pipe
to the heater as directly as possible. Seal all joints.
Provide adequate hangers as required in the venting
system manufacturer’s Installation Instructions, or at
least every 4 feet.
The unit must not support the weight of the vent
pipe.
The maximum equivalent pipe length
allowed is 100 feet (30m).
Each elbow is
considered to be 5 feet (1.5m). The manufacturer
offers accessory kits to use with horizontal and
vertical exhaust vent systems, as shown in Table 9
3.D.1 Common Venting
This unit can be common vented, however, the
common venting must be a professionally designed
and approved system. See Document 1396.
Application Guide for Common Venting
(commercial condensing)
, available online.
Catagory II and IV units are never permitted to
share a vent with any Catagory 1 appliances.
3.D.2 Venting Requirements Unique to
Canada
These high efficiency boilers and water heaters
are Vent Category II and IV appliances. Per the
requirements of CAN/CSA-B149.1, only BH vent
systems can be connected to these units and
such vent systems, either ULC S636 certified
stainless steel or other ULC S636 certified BH
vent (eg. plastics) must be installed per the vent
manufacturer’s certified installation instructions.
It is the responsibility of the appropriately
licensed technician installing this unit to use ULC
S636 certified vent material consistent with the
requirements as described in the Venting and
Combustion Air section.
Class I venting systems are suitable for gas-fired
appliances producing flue gas temperature of more
than 135°C, but not more than 245°C.
Class II venting systems are suitable for gas-fired
appliances producing flue gas temperatures of
135°C or less.
Table 9. Vent Accessory Kits
(Place in section 3.1)
Model 1600 Model 2000 Model 2500 Model 3000 Model 3500 Model 4000
Screen for horizontal galvanized air pipe
D2012104
D2012101
D2012101
D2012102
D2012103
D2012103
Screen for horizontal PVC air pipe
CA012004
CA012001
CA012001
CA012002
CA012003
CA012003
Screen for horizontal polypropylene air pipe
CA012204
CA012201
CA012201
CA012202
CA012203
CA012203
Screen for vertical galvanized air pipe
D2012204
D2012201
D2012201
D2012202
D2012203
D2012203
Screen for vertical PVC air pipe
CA012404
CA012401
CA012401
CA012402
CA012403
CA012403
Screen for vertical polypropylene air pipe
CA012604
CA012601
CA012601
CA012602
CA012603
CA012603
Table 3a - Ducted Air Accessories
(Place in section 3.2)
Model 1600 Model 2000 Model 2500 Model 3000 Model 3500 Model 4000
Horizontal vent terminal for stainless steel
D2012004
D2012001
D2012001
D2012002
D2012003
D2012003
Screen for horizontal CPVC vent
CA012104
CA012101
CA012101
CA012102
CA012103
CA012103
Screen for vertical stainless steel vent
D2012304
D2012301
D2012301
D2012302
D2012303
D2012303
Screen for vertical CPVC vent
CA012504
CA012501
CA012501
CA012502
CA012503
CA012503
Table 3* - Vent Accessories
(Place in section 3.5)
Model 1600 Model 2000 Model 2500 Model 3000 Model 3500 Model 4000
Air intake screen for unit placed outdoors
CA0011904
CA011901
CA011901
CA011902 CA0011903 CA0011903
Vent terminal for unit placed outdoors
CA011803
CA011801
CA011801
CA011802
CA011803
CA011803
Table 3** - Air & Vent Accessories for Units Placed Outdoors
Installation Standards
Material
United States
Canada
Stainless steel
UL 1738
Venting must be ULC S636 certified for use as
venting material. The venting material class must
be chosen based upon the intended application
of the unit, and must be installed according to
the maximum flue gas temperature and the vent
manufacturer’s instructions.
CPVC, sch 40
ANSI/ASTM F441
Polypropylene
ULC S636 Class 2C
Table 10. Required Exhaust Vent Material
