Keystone KS - Venting Requirements Unique to Canada

Keystone Boilers and Water Heaters
Page 13
IMPORTANT NOTE ABOUT COMMON VENTING:
A single vent that is shared by multiple Keystone 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 Keystone
units unless the vent system meets this
requirement. Keystone units are never permitted to
share a vent with Category I appliances.
A condensate drain trap is built into Keystone.
Connect a 3/4" PVC pipe between the drain
connection and a floor drain (or condensate pump if a
floor drain is not accessible).
The condensate drain must be installed so as to
prevent accumulation of condensate. When a con-
densate pump is not used, the tubing must continuously
slope downward toward the drain with no spiraling.
Consult local codes for disposal method.
Caution
Condensate is mildly acidic (pH
..
..
.5), and may harm
some floor drains and/or pipes, particularly those that
are metal. Ensure that the drain, drainpipe, and
anything that will come in contact with the
condensate can withstand the acidity, or neutralize
the condensate before disposal. Damage caused by
failure to install a neutralizer kit or to adequately
treat condensate will not be the manufacturer’s
responsibility.
3.2.1 Venting Requirements Unique to
Canada
Keystone 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 7) are
not to be used with Keystone
units for Canada (underlined):
A. exhaust vent terminal (not to be used)
B. air intake terminal
C. temperature/pressure gauge kit
D. circulator pump/wire harness (units with pump)
E. CPVC exhaust pipe section (199-500)
(not to be used)
F. outdoor/system sensor kit
G. flow switch kit (500-850)
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 Keystone unit to use ULC
S636 certified vent material consistent with the
requirements as described in the Venting and
Combustion Air section.
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
Keystone unit: within 2 feet of the flue connection.
There is no flue gas sampling port internal to the
Keystone, so one must be installed in the vent system
external to the Keystone 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, TriangleTube
suggests using a tee with the branch connection sized to
allow for insertion of a flue gas analyzer probe. The
branch connection must be resealable with a cap or
other by other means to ensure the vent system remains
sealed (Figure 10).
Consideration must be given to the placement and
orientation of the flue gas sampling port to ensure that
condensate is free to flow back into the Keystone unit
and not collect anywhere in the vent system - including
in the flue gas sampling port.
An exhaust vent terminal must be installed. If an
exhaust vent terminal is not available with the certified
vent system, TriangleTube suggests the use of a coupler
fitting from the certified vent system into which the vent
terminal screen, included with the Keystone and shown
in the Unpacking section of the Keystone Installation &
Operating Instructions, be installed. Be sure to install
and terminate both vent and combustion air pipes per
the Venting and Combustion Air section of the
Keystone instructions.
Figure 10. Test Port.