5
FUTERA III INSTALLATION AND OPERATION INSTRUCTIONS
VENT SYSTEM OPTIONS
The Futera III may be vented the following ways:
1)
Direct Vent, Positive Pressure, Category IV
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 IV
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)
Vertical/Chimney Vent, Negative Pressure, Category II
uses an approved metal chimney system.
NOTE: All venting, combustion air material supplied by
installer.
CAUTION: A combustion air damper interlocked with
the unit should be installed in the intake air pipe when
the infiltration of subfreezing air could occur, otherwise
the unit could freeze up voiding the warranty!
Intake Air Option – Vertical Guidelines
The maximum equivalent length for the vertical intake
air pipe is
60 ft
,
18.3 m. Each 90˚ elbow and the intake
air terminal are equal to
10 linear ft
,
3.0 m of pipe, see
Table 3.
An approved, nonrestrictive intake air terminal must be
used. The intake air terminal must terminate as shown in
Figure 3. The penetration point in the roof must be properly
flashed and sealed.
Intake Air Option – Horizontal Guidelines
The maximum equivalent length for the horizontal intake
air pipe is
60 ft
,
18.3 m. Each 90˚ elbow and the intake air
terminal are equal to
10 linear ft
,
3.0 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 intake
air terminal from RBI must be used, see Figures 1, 2
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 0.1 in,
2.5 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!