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Cast Iron Condensing Boilers – Installation Manual
FlexCore Stainless Steel Condensing Boilers – Installation Manual
All joints in metal intake air systems must be
secured using corrosion resistant fasteners
and sealed using a suitable Silicone caulk. If
PVC or CPVC is used, the joints must be
cleaned with a suitable solvent and connected
using a solvent based PVC cement. The
intake air system MUST be supported by the
building structure not the boiler.
Direct Intake Air Option - Vertical
The maximum equivalent length for the vertical intake
air pipe is
100 ft, 30.5 m. Each 90° mitered elbow and
the intake air cap are equal to
10 ft, 3.3 m of straight
pipe. If 90° long sweep elbows are installed use the
manufacturers recommended equivalent length.
A listed, nonrestrictive intake air cap must be used. The
intake air cap must terminate as shown in Figure 4. The
penetration point in the roof must be properly flashed
and sealed.
Direct Intake Air Option - Horizontal
The maximum equivalent length for the horizontal
intake air pipe is
100 ft, 30.5 m. Each 90° mitered elbow
and the intake air terminal are equal to
10 ft, 3.3 m of
straight pipe. If 90° long sweep elbows are installed use
the manufacturers recommended equivalent length.
Horizontal runs that exceed
5 ft, 1.5 m must be
supported at
3 ft, 0.98 m intervals with overhead
hangers. The intake air terminal must terminate as
shown in Figures 2, 3 or 5.
GENERAL VENTING GUIDELINES
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 CSA B149.1
or .2 Installation Code. See Figure A for
added clarity. Improper venting can result in
excessive levels of carbon monoxide which
can result in severe personal injury or death!
Boiler shall not be connected to a chimney
flue serving a separate appliance, designed
to burn solid fuel.
All vent systems must be fully supported by the building
structure and not by the boiler. Appropriate thimbles and
fire-stops must be used where required.
Improper installation of common positive
pressure vent systems can result in excessive
levels of carbon monoxide which can cause
severe personal injury or death!
For Category II and IV appliances the vent
shall not terminate:
1) over public walkways; or
2) near soffit vents or crawl spaces or other
areas where condensate or vapor could
create a nuisance or hazard or cause
property damage; or
3) where condensate vapor could cause
damage or could be detrimental to the
operation of regulators, relief valves, or other
equipment.
A barometric damper or blast gate as
required, must be installed if a Category II
vertical vent system produces a negative
draft in excess of
0.10 in, 2.5 mm WC at the
flue outlet. Size the vent system per local
codes and the vent pipe manufactuers
requirements, using generally accepted
engineering practices.
For instructions utilizing the non-metallic vent
option, see Addendum (F-PVS-IOM-1) for
PVC and (F-DVS-IOM-1/FCR-PPVCT-1) for
Polypropylene.
VENT SYSTEM OPTIONS
The FlexCore may be vented the following ways:
1)
Direct Vent (individual venting only) (page 11
& 12) - Positive Pressure, Category IV uses a
stainless steel vent system certified to UL 1738 for
installations in the United States, and a stainless
steel vent system certified to ULC S636 for
installations in Canada. Combustion air is piped
from the outdoors to the blower inlet.
2)
Side Wall Vent (individual venting only) (page
13) - Positive Pressure, Category IV uses a
stainless steel vent system certified to UL 1738 for
installations in the United States, and a stainless
steel vent system certified to ULC S636 for
installations in Canada. Combustion air is obtained
from the space in which the unit is installed.
To ensure proper operation, boilers that are
sidewall vented and use room air must not
be fired less than 33% input.
3)
Vertical Vent (individual venting only) (page
13) - Positive Pressure, Category IV uses a
stainless steel vent system certified to UL 1738 for
installations in the United States, and a stainless
steel vent system certified to ULC S636 for
installations in Canada. Combustion air is obtained
from the space in which the unit is installed.
