Internet Version for Reference Only
Bradford White
Page 8
Copper Brute II
Page 9
2.2 Venting
2.2.1 Vent Categories
Depending upon desired Copper Brute II venting,
it may be considered a Category I or a Category III
appliance. In general, a vertical vent system will
be a Category I system. However, in rare instances,
a Copper Brute II vertical vent system may be
considered Category III. In the U.S., the National Fuel
Gas Code (ANSI Z223.1-Latest Edition), or in Canada
the CSA B149.1 (latest edition), defines a Category
I vent system, and includes rules and tables to size
these vent systems. If the Copper Brute II vertical
vent system does not satisfy the criteria for Category I
venting, it must be vented as a Category III system.
All Copper Brute II vent systems which
discharge horizontally (without the use of a power
venter) are considered Category III vent systems.
2.2.2 Category I Vent
When vented as a category I appliance, the
vent system must conform to the National Fuel Gas
Code (ANSI Z223.1-Latest Edition) in the U.S., or
in Canada, to CSA B149.1 (latest edition). The vent
system must be sized and installed for a Category I
Fan-Assisted Appliance.
If chimney height is greater than 25 feet, or
if multiple units are vented into the same vertical
vent, a barometric damper must be installed on each
appliance, such that the flue draft does not exceed
(negative) 0.1" w.c.
If using a power venter for any type of Category
I venting, the draft should be set between (negative)
0.01 and 0.10" w.c.
2.2.3 Common Venting Systems
Copper Brute II heaters are Category I fan-
assisted when vented vertically and adhering to all
applicable codes. Copper Brute II heaters are not
allowed to be vented into a common horizontal vent
system, unless a properly sized vent fan is used, and
the common vent system is properly designed by the
vent fan manufacturer or a qualified engineer. When
common venting Copper Brute II fan-assisted unit
with other appliances through one shared vertical duct
called a “common vent”, special care must be taken by
the installer to ensure safe operation. In the event that
the common vent is blocked, it is possible, especially
for fan-assisted devices, to vent backwards through
non-operating appliances sharing the vent, allowing
combustion products to infiltrate occupied spaces.
If the appliances are allowed to operate in this
condition, serious injury or death may occur.
WARNING
Operation of appliances with a blocked common
vent may lead to serious injury or death. Safety
devices must be implemented to prevent blocked
common vent operation. If safe operation of all
appliances connected to a common vent cannot
be assured, including prevention of spillage of flue
gasses into living spaces, common venting should
not be applied, and appliances should each be
vented separately.
It is for this reason that, in addition to
following proper vent sizing, construction and safety
requirements from the National Fuel Gas Code,
ANSI Z223.1 or in Canada, from CSA B149.1 as
well as all applicable local codes, it is required that
installers provide some means to prevent operation
with a blocked common vent. It is suggested that a
blocked vent safety system be employed such that if
the switch from one appliance trips due to excessive
stack spill or back pressure indicating a blocked vent
condition, that all appliances attached to the vent be
locked out and prevented from operating. Note that
the Copper Brute II is equipped with a blocked vent
safety (pressure) switch, as shipped. However, this
safety switch has only been designed and tested to be
effective in installations where the Copper Brute II
is vented separately and NOT common vented with
other appliances. As an additional precaution, it is
recommended that a Carbon Monoxide (CO) alarm be
installed in all enclosed spaces containing combustion
appliances. If assistance is required in determining
how a blocked vent safety system should be connected
to a Bradford White product, please call the Bradford
White Service Department at (800) 334-3393. Refer
to the installation and operating instructions on all
appliances to be common vented for instructions,
warnings, restrictions and safety requirements. If safe
operation of all appliances connected to a common
vent cannot be assured, including prevention of
spillage of flue gasses into living spaces, common
venting should not be applied, and appliances should
each be vented separately.
2.2.4 Category III Vent
When the Copper Brute II is vented with
horizontal discharge, it must be installed per
this installation manual and the venting system
manufacturer’s installation instructions. The vent
system must be sealed stainless steel, per Table 5.
Route the vent pipe to the heater as directly as
possible. Seal all joints and provide adequate hangers
as required in the venting system manufacturer’s
Installation Instructions. Horizontal portions of the
venting system must be supported to prevent sagging
and may not have any low sections that could trap
condensate. The unit must not support the weight of
