Finned copper tube gas boilers & water heaters – Boiler Manual
Finned copper tube gas boilers & water heaters – Boiler Manual
9
F
SIDE WALL VENT, POSITIVE PRESSURE,
CATEGORY IV – Figure 5
In this confi guration the boiler/water heater blower is used to push the fl ue
products horizontally to the outdoors, see Figure 5. Th e air for combustion
is taken from the space in which the unit is installed. Th e applicable instructions
under the “COMBUSTION AIR & VENTILATION” section must be
followed! Th e vent guidelines under the Horizontal Direct Vent Systems
section must also be followed.
Figure 5
Side Wall Venting
VERTICAL VENT, POSITIVE PRESSURE,
CATEGORY IV – Figure 6
(Vent pipe equivalent length up to
60 ft
,
18.3 m
maximum)
Masonry chimneys, when used, must be lined with a
metal liner certifi ed for Category IV venting.
A through 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.
1.5 FT
0.5 m
1/4 IN. PER F00T
20 mm/m
Figure 6
Vertical Venting with a Metal Chimney System
VERTICAL CHIMNEY VENTING NEGATIVE
PRESSURE — CATEGORY II (Common Venting)
Category II venting is required for multiple Fusion
boilers connected to a common vent. Common vent
systems cannot be pressurized.
Th e Fusion is listed as a Category II appliance when vented vertically
into a listed metal chimney system. Th e chimney must provide a
negative pressure not greater than
0.10 inch
,
2.5 mm
WC at the
boiler/water heater fl ue collar with the unit running.
When using a listed metal chimney system the chimney
system manufacturer’s instructions must be followed.
Masonry chimneys, when used, must be lined with a
metal liner certifi ed for Category IV venting.
10 FT.
3.1 m