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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 may this appliance vent gases into a masonry chimney. The internal safety
system shuts down the boiler in case the temperature of the flue gasses 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 air tight 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 building-up on surrounding
parts/structures, because the condensate will freeze. This risk must be taken into account during
NOTICE
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 (See also warnings below).
9.1.1
V
.
ENT SIZING
Boiler
Intake Air and Exhaust
VGH 299, 399
VGH 500
Table 9-1
Increasing or decreasing combustion air or vent piping sizes is not permitted.
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 per the National Building Code, Section
305, Table 305.4 or as local codes dictate.
Connections vent gas (vent) and air supply:
32
4"
6"
AIR INTAKE
E93.1601EN032.C VGH installation manual
VENT
(FLUE GAS)
Figure 9-1
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