Bradford White Brute BNTH Installation And Operation Instructions Manual page 15

Brute
BOILERS AND VOLUME WATER HEATERS
IIb, or a stainless steel venting system that complies with
UL 1738 Standard. (See Table 5.)
The unit's vent can terminate through the roof, or through
an outside wall.
When using PVC/CPVC for vent material, venting must
be connected to the CPVC section included with Brute
sizes 80-850. The CPVC vent section included with the
Brute may be broken by CPVC fittings if necessary, but
never reduced in total length. See Table 2 to select the
appropriate vent pipe diameter. When using polypropylene,
all vent material must be produced by the same
manufacturer, and have a ULC-S636 rating.
All installations should be done following the vent supplier's
recommended installation techniques. If manufacturer's
instructions are not available for the material used, follow
the Bradford White recommendations.
The vent pipe must pitch upward, toward the vent terminal,
not less than 1/4" per foot, so that condensate will run
back to the Brute to drain. Route 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 the vent pipe. Please see
Table 2 for proper diameter vs. length allowed.
IMPORTANT NOTE ABOUT COMMON VENTING: A
single vent that is shared by multiple Brute units MUST
be engineered by a competent venting specialist, and
involves the selection of draft inducing equipment,
hardware and controls to properly balance flue gas
pressures. Do not common vent Brute units unless
the vent system meets this requirement. Brute units
are never permitted to share a vent with Category I
appliances.
Venting Requirements Unique to Canada
Brute boilers and water heaters are Vent Category IV
appliances. Per the requirements of CAN/CSA-B149.1,
only BH vent systems can be connected to these units
and such vent systems, either ULC S636 certified
stainless steel or other ULC S636 certified BH vent (eg.
plastics) must be installed per the vent manufacturer's
certified installation instructions.
As a result, two items listed in the Unpacking section
(Figure 8) are not included with Brute units for Canada
(underlined):
A exhaust vent terminal (not included)
B. air intake terminal
C. temperature/pressure gauge kit
D. circulator pump/wire harness (units with pump)
E. CPVC exhaust pipe section (80-500) (not
incl.)
F. outdoor/system sensor kit
G. flow switch kit (399-850)
H. alternate size vent/terminal screens
J. exhaust vent adapter CPVC/ST ST (750-850)
It is the responsibility of the appropriately licensed
technician installing this Brute unit to use ULC S636
certified vent material consistent with the requirements
as described in the Venting and Combustion Air section.
Class I venting systems are suitable for gas-fired
appliances producing flue gas temperature of more than
135°C, but not more than 245°C.
Class II venting systems are suitable for gas-fired
appliances producing flue gas temperatures of 135°C or
less.
Class II venting systems are further classified into four
temperature ratings as follows:
A Up to and including 65°C
B Up to and including 90°C
C Up to and including 110°C, and
D Up to and including 135°C
IMPORTANT! It is also the responsibility of the installer
to ensure that a flue gas sampling port is installed in
the vent system. This flue gas sampling port must be
installed near the flue connection of the Brute unit:
within 2 feet of the flue connection. There is no flue
gas sampling port internal to the Brute, so one must
be installed in the vent system external to the Brute
unit. A flue gas sampling port available as a component
of the ULC S636 certified vent system is preferred.
However, if one is not available with the certified vent
system, Bradford White suggests using a tee with the
Figure 12. Test Port - ULC-S636 system
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