Installation / Operation Instruction Manual

Page 25
Brute HIGH EFFICIENCY COMMERCIAL BOILERS AND VOLUME WATER HEATERS
®
Figure 18. Test Port - ULC-S636 system
internal to the unit, so one must be installed in the vent
system external to the unit. A ue gas sampling port
available as a component of the ULC S636 certied vent
system is preferred. However, if one is not available with
the certied vent system, the manufacturer suggests
using a tee with the branch connection sized to allow
for insertion of a ue gas analyzer probe. The branch
connection must be resealable with a cap or other by
other means to ensure the vent system remains sealed.
(See Figure 18)
Consideration must be given to the placement and
orientation of the ue gas sampling port to ensure that
condensate is free to ow back into the unit and not
collect anywhere in the vent system - including in the
ue gas sampling port.
An exhaust vent terminal must be installed. If an
exhaust vent terminal is not available with the certied
vent system, the manufacturer suggests the use of a
coupler tting from the certied vent system into which
the vent terminal screen, included with the unit and
shown in the Unpacking section, be installed. Be sure to
install and terminate both vent and combustion air pipes
per the Venting and Combustion Air section of the unit’s
instructions.
3.D Common Venting
High e󰀩ciency boilers and water heaters up to
500 MBTU/H may be common vented using Non-Return
Valve kits and Centrotherm InnoFlue polypropylene
venting. Go online to the manufacturer’s website and
refer to the Common Venting Installation Instructions,
document number 1427, for instructions on sizing and
installing a common venting system.
If common venting is required on larger model sizes or
with di󰀨erent venting materials, it MUST be engineered
by a competent venting specialist, and involves the
selection of draft inducing equipment, hardware and
controls to properly balance ue gas pressures. Do
not common vent these units unless the vent system
meets this requirement. High e󰀩ciency class IV units
are never permitted to share a vent with Category I
appliances.
3.E Locating Vent and Combustion Air
Terminals
Side Wall Vent Terminal
The appropriate side wall vent terminal must be used.
The terminal must be located in accordance with
ANSI Z223.1/NFPA 54 and applicable local codes. In
Canada, the installation must be in accordance with
CSA B149.1 or .2 and local applicable codes. Consider
the points listed on the following page when installing
the terminal.
1. Figure 20 shows the requirements for mechanical
vent terminal clearances for the U.S. and Canada.
The outdoor models must be installed at least 10
ft (the vent pipe) from any door or window that
can be opened. The exhaust vent shall not be
under any overhang or roof. Use only the vent
components included with the boiler.
2. Vent terminals for condensing appliances or
appliances with condensing vents are not
permitted to terminate above a public walkway,
or over an area where condensate or vapor could
create a nuisance or hazard.
3. Locate the vent terminal so that vent gases
cannot be drawn into air conditioning system
inlets.
4. Locate the vent terminal so that vent gases
cannot enter the building through doors, windows,
gravity inlets or other openings. Whenever
possible, avoid locations under windows or near
doors.
5. Locate the vent terminal so that it cannot be
blocked by snow. The installer may determine
that a vent terminal must be higher than the
minimum shown in codes, depending upon
local conditions.
6. Locate the terminal so the vent exhaust does
not settle on building surfaces or other nearby
objects. Vent products may damage surfaces or
objects.
7. If the boiler or water heater uses ducted
combustion air from an intake terminal located on
the same wall.
If the vent termination is located in an area exposed to
high winds, an optional PVC tee (the same diameter as
the vent pipe) may be used. The tee’d vent termination
o󰀨ers greater protection from wind related operating
issues.