9
FUTERA III INSTALLATION AND OPERATION INSTRUCTIONS
WARNING: If an appliance using any type of a
mechanical draft system operating under positive
pressure is connected to a chimney flue, never
connect any other appliances to this flue. 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, lined and sized. Exterior masonry chimneys
should not be used unless properly lined to prevent
condensation and draft problems. Table 5 lists the
equivalent breeching and flue sizes required for the boiler/
water heater.
Table 5 - Equivalent Breeching & Chimney Size,
Negative Pressure
Model Size
Pipe Diameter
in
mm
500
6
152
750
6
152
1000
7
178
1250
8
203
1500
8
203
1750
10
254
2000
10
254
Note: These sizes are based on a
20 ft
,
6.1m chimney height.
Figure 5 – Side Wall Venting
SIDE WALL VENT,
POSITIVE PRESSURE, CATEGORY IV
In this configuration the boiler/water heater blower is used
to push the flue products horizontally to the outdoors, see
Figure 5. 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.
VERTICAL/CHIMNEY VENT,
NEGATIVE PRESSURE, CATEGORY II
The Futera III is listed as a Category II appliance when
vented vertically into a listed metal chimney system,
Figures 6 & 7. The chimney must provide a
negative
pressure not greater than
0.15 in
,
3.8 mm W.C. at the
boiler/water heater flue collar with the unit running. A
barometric damper must be installed between the flue
collar and the vent connector when negative pressures
exceed
0.15 in
,
3.8 mm W.C.
NOTE: When using a listed metal chimney system the
chimney system manufacturer’s instructions must be
followed.
When more than one appliance is connected to the same
chimney flue, the flue must be large enough to safely vent
the combined output of all of the appliances.
1.5 FT
0.5 m
1/4 IN. PER F00T
20 mm/m
4 FT
1.2 m
3 FT
0.9 m
24"
0.6 m