Venting - Primera 400B Installation & Maintenance Manual

NOTE: This unit may be installed with an optional remote air intake system which uses a make-up air duct to draw
combustion air directly from outdoors. (See Vertical and Horizontal Remote Air Section).
WARNING – Adequate clean combustion air must be provided to the appliance. Under no circumstances
should the appliance ever be under a negative pressure. Particular care should be taken when exhaust fans,
compressors, air handling units, etc. may rob air from the appliance. The combustion air supply must be
completely free of any chemical or fumes, which may be corrosive to the boiler. Some common chemical
fumes to avoid are fluorocarbons and other halogenated compounds, most commonly present as refrigerants
or solvents, such as Freon, trichloroethylene, perchlorethylene, chlorine, etc. These chemicals, when in
contact with the equipment or when burned, form acids which quickly attack the tubes, flue collector, stack
and other appliance and auxiliary equipment. The result of inadequate clean combustion air or negative
pressure can be premature unwarranted product failure or unsafe operation producing carbon monoxide that
could escape into the building. Exposure to carbon monoxide can lead to injury or death.

VENTING

For appliances connecting to gas vents or chimneys, vent installation must be in accordance with Part 7, "Venting of
Equipment," of the latest edition of the National Fuel Gas Code, ANSI Z223.1 or, in Canada, Section 7, "Venting
Systems and Air Supply for Appliances" of the latest edition of the CAN/CSA B149 Installation Codes, or applicable
provisions of the local building codes.
Do not connect vent connectors serving appliances vented by natural draft to any portion of a mechanical draft system
operating under positive pressure.
A barometric damper (draft control) is supplied for use on conventional vented installations. A properly installed and
adjusted barometric damper helps stabilize draft and regulate high updraft. Conventional vented multiple unit
installations with combined venting require barometric dampers to regulate draft at each unit. Adjust the barometric
damper to 0.04 inches water column updraft, when used. Follow the barometric damper manufacturer's installation
instructions.
VENT AND COMBUSTION AIR CONNECTION SIZES (nominal sizes in inches)
MODELS
400
540
750
1000
1200
1600
2000
Locate units as close as possible to chimney or gas vent. For conventionally vented installations, the connection from
the vent to the stack or vent termination outside the building must be made with listed Type "B" double wall (or
equivalent) vent connectors and must be direct as possible with no reduction in diameter.
Support horizontal portions of the venting system to prevent sagging. Horizontal runs must slope upwards not less
than 1/4 inch per foot (21 mm/m) from the boiler to the vent terminal. Follow manufacturer's instructions.
The Following Categories Apply To This Product For Venting Purposes:
Category I An appliance that operates with a non-positive vent static pressure and with a vent gas temperature that
avoids excessive condensate production in the vent.
Category III An appliance that operates with a positive vent static pressure and with a vent gas temperature that
avoids excessive condensate production in the vent.
VENTING OPTIONS
Gas vents and combustion air ducts connected to PRIMERA
through the side wall. The product may also be equipped with an optional venting system suitable for outdoor
installation.
Conventional Vertical Vent Termination (Category I)
The vent terminal should extend at least 3 ft (.09 m) above the highest point where it passes through the roof of a
building and at least 2 ft (.06 m) higher than any portion of a building within a horizontal distance of 10 ft. (3.0 m).
VENT CONNECTION SIZE
6"
6"
8"
8"
10"
12"
12"
6
COMBUSTION AIR PIPE SIZE
6"
6"
8"
8"
10"
12"
12"
®
products may terminate either above the roof surface or
34-50 04/02/2010