Burnham V11 Series Installation, Operating And Service Instructions page 12

WARNING
When a V11 gas fired boiler is connected to
a venting system that is designed so that
it will operate under a positive pressure,
manufactured vent systems, designed and
approved for positive pressure application per
UL8, must be used (for example, Van-Packer
model CS, Protech Model FasNSeal / FasNSeal
W2, Heatfab Saf-T-Vent or equivalent).
When a V11 oil fired or combination gas/oil
fired boiler is connected to a venting system
that is designed so that it will operate un-
der a positive pressure, manufactured vent
systems, designed and approved for posi-
tive pressure application, must be used (for
example, Selkirk Metalbestos Model PS / IPS,
Van-Packer Model ES or equivalent).
The V11 Series boiler is designed for forced draft
firing and may be used with a conventional natural
draft stack (15' minimum height) or a stub vent,
sometimes called a diesel stack (see Figure 3a). See
Table I for the proper vent outlet size. For low
silhouette vent terminations, see Figure 3b. Draft
controls are not normally required, although they
may be used on installations where a natural draft
stack is used or on multiple boiler installations
with a common stack. The boiler is provided with
a breeching damper, which should be adjusted to
maintain a positive pressure of 0.1" W.C. in the vent
connector box during burner high fire operation (see
breeching pressure sensing port in Figure 1).
Venting instructions are recommendations only. Consult a venting expert on the design of a specific
vent system for your application. The ASHRAE Venting Guide and The National Fuel Gas Code, NFPA 54
should be considered in all venting systems.
Conventional vent material may not e suitable for the application. Flue gases can leak carbon monoxide
from the joints on these materials and can result in severe personal injury or death.
Installations having long horizontal runs or an excessive amount of tees or elbows will restrict the flow
of combustion gases and can result in condensation, flue gas leakage of carbon monoxide, resulting in
severe personal injury or death.
Figure a: Typical Arangement For Stub Vent
If the venting system is designed for positive or forced
draft venting, the boiler, vent connector and stack will
operate under positive pressure. Gas tight vent systems
designed for pressure systems must be used to prevent
flue by-product leakage. The vent height is usually
limited to prevent negative draft, typically three (3)
feet above the roof line (see Figure 3a). The damper
shall be adjusted to maintain a positive pressure of 0.1"
W.C. in the vent connector box during burner high fire
operation (see breeching pressure sensing port in Figure
1).
If the venting system is designed for negative pressure
(natural draft), the boiler still operates with positive
pressure in the chamber and up to the fixed damper on
the flue collar. However, if the venting system is larger
than what is required, the stack will provide a surplus
draft (or negative pressure) that may require the use of
a barometric damper to maintain the positive 0.1" W.C.
pressure at the flue outlet. Multiple forced draft boiler
stacks should always be designed as negative to ensure
the products of combustion do not exit a boiler that is
not firing.
WARNING
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