Installation & Operation Manual
18
2
General
venting
Common venting CAT II:
Flues of multiple appliances may be combined by incorporating
a vent increaser to change the Category IV appliance to a
Category II vent system which can be common vented using
an engineered vent system. An increaser must be used and
the combined engineered vent system must be designed to
ensure that flue products will be properly exhausted from the
building at all times.
Failure to use the correct vent increaser
or a properly sized vent system may result in a hazardous
condition where flue gases spill into an occupied living
space.
Consult a vent designer to determine the diameter of
the common vent pipe required for combined vent installation.
It is recommended that all vent joints and seams are sealed
gastight. This vent system has specific vent material and
installation requirements. The negative draft in a conventional
vent installation must be within the range of 0.02 to 0.08 inches
w.c. to ensure proper operation. Make all draft readings while
the unit is in stable operation (approximately 2 to 5 minutes).
Model
Category IV
Standard Vent Size
Category II
Increaser Size
2500
9"
10'
3000
10"
12'
3500
10"
12'
4000
12"
14'
5000
14"
16'
Table 2D Category IV to Category II Conversion Chart
Removing from existing vent
Follow the instructions in Section 1, page 10 of this manual
when removing a boiler from an existing vent system.
Vent and air piping
Vent and air system:
Installation must comply with local
requirements and with the National Fuel
Gas Code, NFPA 54 / ANSI Z223.1 for U.S.
installations or CSA B149.1 for Canadian
installations.
You must also install air piping from outside to the boiler air
intake adapter. The resultant installation is direct vent (sealed
combustion).
You may use any of the vent/air piping methods covered in this
manual. Do not attempt to install the Power-fin using any other
means.
NOTICE
WARNING
When determining equivalent combustion air and vent length,
add 5 feet (1.5m) for each 90° elbow and 3 feet (.9 m) for each
45° elbow.
EXAMPLE:
20 feet (6 m) of pipe + (4) 90° (3) 45°
elbows = 49 equivalent feet (15 m) of piping.
DO NOT mix components from different
systems. The vent system could fail, causing
leakage of flue products into the living space.
Use only approved stainless steel pipe and
fittings.
Vent, air piping and termination:
The Power-fin vent and air piping can be installed through
the roof or through a sidewall. Follow the procedures in this
manual for the method chosen. Refer to the information in
this manual to determine acceptable vent and air piping length.
Air contamination
Pool and laundry products and common household and hobby
products often contain fluorine or chlorine compounds. When
these chemicals pass through the boiler, they can form strong
acids. The acid can eat through the boiler wall, causing serious
damage and presenting a possible threat of flue gas spillage or
boiler water leakage into the building.
Please read the information given in Table 1A, page 10,
listing contaminants and areas likely to contain them. If
contaminating chemicals will be present near the location of the
boiler combustion air inlet, have your installer pipe the boiler
combustion air and vent to another location, per this manual.
If the boiler combustion air inlet is located
in a laundry room or pool facility, for
example, these areas will always contain
hazardous contaminants.
WARNING
To prevent the potential of severe personal
injury or death, check for areas and products
listed in Table 1A, page 10 before installing
the boiler or air inlet piping.
If contaminants are found, you MUST:
• Remove products permanently.
—OR—
• Relocate air inlet and vent
terminations to other areas.
WARNING
