10
FUTERA II INSTALLATION AND OPERATION INSTRUCTIONS
SIDE WALL VENT,
POSITIVE PRESSURE, CATEGORY III
In this confi guration the boiler/water heater blower is used
to push the fl ue products horizontally to the outdoors, see
Figure 7. The air for combustion is taken from the space
in which the unit is installed. The applicable instructions
under the “COMBUSTION AIR & VENTILATION” section
must be followed! The vent guidelines under the Horizontal
Direct Vent Systems section must also be followed.
HORIZONTAL VENT,
NEGATIVE PRESSURE, CATEGORY I
In this confi guration a wall-mounted power venter must be
used to pull the fl ue products horizontally from the unit and
vent them to the outdoors, see Figures 3, 4 & 7A. The air
for combustion is taken from the space in which the unit is
installed, or from the outdoors. The applicable instructions
under the “COMBUSTION AIR & VENTILATION” section
must be followed!
To maximize the performance of single wall sheet metal
vent systems locate 90˚ elbows as far from the boiler as
possible and from one another. For best results, horizontal
vent systems should be as short and straight as possible.
When horizontal vent runs exceed 5 ft, 1.5 m they
must be supported at 3 ft, 0.9 m intervals with overhead
hangers. The vent system must be pitched down, toward
the vent terminal, 1/4 in/ft, 21 mm/m. If any part of a single
wall metal vent system passes through an unheated space
it must be insulated with insulation rated for 400˚F, 204˚C.
Horizontal vent systems shall terminate at least 4 ft,
1.2 m below, 4 ft, 1.2 m horizontally from or 1 ft,
0.30 m above any door, window or gravity air inlet
into any building. It must not ter minate less than
4 ft, 1.2 m horizontally from, and in no case above
or below, unless a 4 ft, 1.2 m horizontal distance
is maintained, from electric meters, gas meters, regulators
and relief equipment and not less than 7 ft, 2.1 m from
any adjacent public walkway.The bottom of the vent
terminal(s) shall be located at least 5 ft, 1.5 m above
the air intake terminal(s) unless there is a minimum 5 ft,
1.5 m horizontal separation between them. Avoid terminal
locations likely to be affected by winds, snowdrifts, people
and pets. Protect building materials and vegetation from
degradation caused by the fl ue gases.
To determine the appropriate power venter for the
boiler/water heater, see Table 3. Follow the power venter
manufacturer’s installation instructions.
Table 3 - Power Venter Sizes
VERTICAL/CHIMNEY VENT,
NEGATIVE PRESSURE, CATEGORY I
The Futera II is listed as a Category I appliance when
vented vertically into a listed metal chimney system or
properly sized masonry chimney, Figures 8 & 9. The
chimney must provide a negative pressure of 0.01 to 0.08
in, 0.25 to 2.0 mm W.C. at the boiler/water heater fl ue collar
with the unit running. A barometric damper must be
attached directly to the fl ue collar increaser as shown.
Multiple Futera II’s can be vented into a single vertical
chimney provided that the breeching and chimney are
properly sized per the latest revision of the National Fuel
Gas Code, ANSI Z223.1.
When more than one appliance is connected to the same
chimney fl ue, the fl ue must be large enough to safely vent
the combined output of all of the appliances.
WARNING: If an appliance using any type of a
mechanical draft system operating under positive
pressure is connected to a chimney fl ue, never
connect any other appliances to this fl ue. Doing
so can result in excessive levels of carbon
monoxide which can cause severe personal injury
or death!
Chimney Inspection & Sizing
A thorough inspection of the masonry chimney must be
performed to ensure that the chimney is clean, properly
constructed and properly sized. Exterior masonry chimneys
should not be used unless properly lined to prevent
condensation and draft problems. Table 3A lists the
equivalent breeching and fl ue sizes required for the boiler/
water heater.
Table 3A - Equivalent Breeching & Chimney Size,
Negative
Pressure
Model Size
Pipe Diameter
in mm
500
8 203
750, 1000
10
254
1250,
1500
12
305
1750,
1950
14
356
Note: These sizes are based on a 20 ft, 6.1m chimney height.
Vent Connections
Locate the boiler/water heater as close to the chimney as
possible. Use the shortest, straightest vent connector
possible for the installation. If horizontal runs exceed 5 ft,
1.5 m they must be supported at 3 ft, 0.9 m intervals with
overhead hangers. Use a type B, single wall stainless or
single wall galvanized steel vent pipe the same diameter
as the fl ue collar to connect the boiler/water heater to a
masonry chimney, see Figure 2. When using a listed metal
chimney system use the appropriate vent connector.
Futera II
Power Venter
Max. Pipe Length
Model
Model
FT
m
500 - 750
HS-3
100
31
1000-1250
HS-4
100
31
1500-1950
HS-5
100
31
