5
FUTERA II INSTALLATION AND OPERATION INSTRUCTIONS
VENT SYSTEM OPTIONS
The Futera II may be vented the following ways:
1)
Direct Vent, Positive Pressure, Category III
uses a
vent system certified to UL 1738 for installations in
the United States, ULS636 for installations in Canada.
Combustion air is piped from the outdoors to the
blower inlet.
2)
Side Wall Vent, Positive Pressure, Category III
uses
a vent system certified to UL 1738 for installations in
the United States, ULS636 for installations in Canada.
Combustion air is obtained from the space in which
the unit is installed.
3)
Horizontal Vent, Negative Pressure, Category I
for
horizontal vent runs equivalent to more than
60 ft,
18.3 m (90 degree elbow = 10 equivalent feet). A
dedicated wall mounted power venter must be used.
The 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 60 equivalent feet (90
degree elbow = 10 equivalent feet). If this is the case, a
power venter must also be used.
If horizontal run is less than 60 equivalent feet, do not
use a barometric damper. Follow applicable instructions
under the “DIRECT VENT, POSITIVE PRESSURE”
section, page 6.
4)
Vertical/Chimney Vent, Negative Pressure,
Category I
uses an approved metal chimney system
or masonry chimney. Combustion air is obtained from
the space in which the unit is installed. A barometric
damper must be installed near the flue outlet when
venting vertically.
5)
Outdoor Installation
uses the outdoor option kit.
Barometric damper is not required.
NOTE: All venting, combustion air material supplied by
installer.
Intake Air Option – Horizontal Guidelines
The maximum equivalent length for the horizontal
combustion air pipe on installations that used the Direct
Vent option is
60 ft
,
18.3 m.
The maximum equivalent length
for the horizontal combustion air pipe on installations that
use the Horizontal Power Vent option is
100 ft
,
30.5 m. Each
90
°
elbow and the combustion air terminal are equal to
10
linear ft
,
3.1 m of pipe. If horizontal runs exceed
5 ft
,
1.5 m
they must be supported at
3 ft
,
0.9 m intervals with overhead
hangers. The certified combustion air terminal from RBI must
be used and installed as shown in Figures 3 and 4.
GENERAL VENTING GUIDELINES
WARNING: The 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 CAN/CGA 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 fire-stops must be used where required.
WARNING: Common vent systems must be
properly engineered and sized to provide a
negative draft of 0.01 to 0.08 in,
0.25 to 2.0 mm
W.C.
at the flue 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!
NOTE: A single acting
barometric damper
must be
installed directly to the boiler/water heater flue outlet, if
required. This does not apply to outdoor units or direct
vent positive pressure units.
NOTE: Some venting applications may require the stop
to be removed for smooth operation. The barometric
damper should be located after the flue 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.
In Canada, B149 (7.25 Draft Regulators) states the
damper shall be of double-acting type.
WARNING: To avoid spillage into the room of
dangerous flue gas containing carbon monoxide,
the opening in damper must never face against the
flow of flue gas.
