Instruction manual
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GENERAL VENTING GUIDELINES
e vent installation must be in accordance with Part
7, Venting of Equipment, of the National Fuel Gas
Code, ANSI Z223.1/NFPA 54-latest revision or
applicable provisions of the local building codes.
Canadian installations must comply with CSA B149.1
or .2 Installation Code. Improper venting can result
in excessive levels of carbon monoxide which can result
in severe personal injury or death!
All vent systems must be fully supported by the building structure
and not by the boiler/water heater. Appropriate thimbles and re-
stops must be used where required.
Common vent systems must be properly engineered
and sized to provide a negative dra of 0.01 to 0.08
in, .25 to 2.0 mm WC at the ue outlet! Common
positive pressure vent systems are not to be used.
Improper installation can result in excessive levels of
carbon monoxide which can cause severe personal
injury or death!
A single acting barometric damper must be
installed directly to the boiler/water heater ue
outlet to ensure proper operation. is does not apply
to outdoor units or direct vent positive pressure units.
Some venting applications may require the stop to be
removed for smooth operation. e barometric
damper should be located a er the ue collector, refer
to Figures 2, 7A and 8 for proper location. Be sure that
the damper is mounted horizontally (never vertically).
Carefully follow the instructions provided with the
barometric damper. Check with local codes for speci c
requirements.
In Canada, B149 (7.25 Dra Regulators) states the
damper shall be of double-acting type.
To avoid spillage into the room of dangerous ue gas
containing carbon monoxide, the opening in damper
must never face against the ow of ue gas.
VENT SYSTEM OPTIONS
e LCD may be vented the following ways:
1) Vertical/Chimney Venting, Negative Pressure, Category
I - uses an approved metal chimney system or properly lined
masonry chimney. Combustion air is obtained from the space
in which the unit is installed or from outdoors. A barometric
damper must be installed near the ue outlet when venting
vertically. See Figures 6 and 7. is also applies to any fan-assisted
chimneys or vents.
2) Direct Vent, Positive Pressure, Category III - for
horizontal vent runs equivalent to 35 , 10.8 m or less.
A stainless steel vent system certi ed to UL 1738 for
installations in the United States. ULC S636 for
installations in Canada must be used when combustion air is
ducted from outdoors, from the same wall.
3) Horizontal Vent, Negative Pressure, Category I -
for horizontal vent runs equivalent to more than 35 ,
10.8 m (90° elbow equals 10 equivalent ). A dedicated wall
mounted power venter must be used. e vent system can be
single wall galvanized steel or type B vent pipe. Combustion
air is obtained from the space in which the unit is installed or
from the outdoors.
A barometric damper must be installed when the horzontal run
is longer than 35 equivalent feet. (90° elbow = 10 equivalent
). If this is the case, a power venter must also be used.
If horizontal run is less than 35 equivalent , do not use a
barometric damper. Follow applicable instructions under the
“COMBUSTION AIR & VENTILATION” section.
4) Outdoor Installation - uses the outdoor option kit. Barometric
damper is not required.
All venting, combusiton air material supplied by
installer. All venting material must be approved for the
application. Consult the vent manufacturer’s product
literature