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9 FLUE GAS AND AIR SUPPLY SYSTEM
General venting
The boiler has a positive pressure vent system.
The boiler is for either direct vent installation or for installation using indoor combustion air, category IV: appliance
with sealed combustion requiring certain venting systems. All combustion air is drawn from outdoors or indoor. All
products of combustion are vented directly outdoors. The vent, and if applicable air-intake piping, must be piped
to the outdoors. Under no conditions should this appliance vent gases into a masonry chimney. The internal safety
system shuts down the boiler in case the temperature of the flue gases becomes too high, after which the appliance
will not run until manually restarted. Installations must comply with CSA B149.1 and local requirements.
The front cover creates an airtight enclosure making sure air is only supplied by the vent air intake. Therefore,
make sure the front cover always has been placed in its position during operation of the appliance.
• Install all horizontal vent components with a minimum angle of 3° downwards in the direction
of the boiler (roughly equal to 1/4 inch per foot or 5 cm per meter). When not installed
accordingly, it may result in condensate building-up in the vent gas tube, eventually causing
component failure.
• When using a wall terminal, there is the possible risk of ice buildup on surrounding
parts/structures, because the condensate will freeze. This risk must be taken into account
NOTICE
during the design phase of the heating installation.
• Because the flue gases can have a low temperature, the boiler needs to have a high efficiency
approved stainless steel or plastic vent system. These materials, including the gaskets, must
be usable for positive pressure vent gas systems.
These parts must be certified for use at temperatures of minimal 70°C / 158°F.
V
ENT SIZING
Boiler type
VGH-80-CH / VGH-90-CO / VGH-100-CH / VGH-120-CH VGH-150-CO /
VGH-150-CH / VGH-180-CH / VGH-200-CO
Table 9.1
Only 2" and 3" venting listed in this manual is permitted for use with the boiler.
NOTICE
Vent connector: used to provide a passageway for conveying combustion gases to the outside. A connector is
provided on the unit for final connection. Vent piping must be supported as per the National Building Code, Section
305, Table 305.4 or as local codes dictate.
Connections vent gas (vent) and air supply:
52
E93.1901EN032 Installation and Service Manual SlantFin VGH-CH / CO
VENT
(FLUE GAS)
Intake Air and Connection
3"
AIR
INTAKE
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