Bradford White UCG100H270 Installation And Operation Manual page 14

For installations in Canada, field supplied vent piping must comply with CAN/CGA B149.1 (latest edition) and be certified to the
Standard For Type BH, Class II, 65°C, Gas Venting Systems, ULC S636. Components of this listed system shall not be interchanged
with other vent systems or unlisted pipe/fittings. All components and specified primers and cements of the certified vent system must
be from a single system manufacturer and not intermixed with other system manufacturer's vent system parts. The supplied vent
connector and vent termination are certified under ULC S636 and are also certified as part of the water heater. Refer to the following
tables for approved venting materials, primers, and cements. All approved primers and cements are to be used within their marked
time limitations.
For installations in the US only
• PVC Sch. 40, 80 (ASTM D-1785)
• PVC DWV (ASTM-D2665)
• CPVC Sch. 40, 80 (ASTM-F441)
• CPVC (ASTM D2846)
• ABS Sch. 40 DWV (ASTM D2661)
For installations in the US only
• PVC and CPVC Primer (ASTM F-656)
• PVC Cement (ASTM D-2564)
• CPVC Cement (ASTM F493)
• ABS Primer and Cement (ASTM D-2235)
Use of cellular core PVC (ASTM F891). Cellular core CPVC, or Radel® (polyphenosulfone) in non-metallic venting systems is
prohibitied, and covering non-metallic venting with thermal insulation is prohibited.
Before beginning installation of any vent pipe, read the vent pipe manufacturer's installation instructions.
Do not install the water heater in any location where the ambient temperature may fall below freezing. Water heater must be
protected from freezing downdrafts during shutdown periods.
The vent shall terminate a minimum of 12 inches above expected snowfall level to prevent blockage of vent termination.
The horizontal centerline of the exhaust vent terminal (if applicable) must not be located lower than the horizontal centerline of the
air intake terminal if vented through the same wall.
A service drain loop must be installed in the drain tubing to serve as a condensate trap to prevent flue gases from escaping into the
room.
NEVER locate the air intake where exhaust gases from other appliances can be introduced into the intake.
Check to make sure flue gases do not recirculate into the air intake terminal when using direct venting. If the water heater is having
service issues, flue recirculation may be a contributing factor. Even when the minimum vent terminal separation distances are
followed, recirculation may still occur depending upon the location outside the building, the distance from other buildings, proximity to
corners, weather conditions, wind patterns, and snow depth. Periodically check to make sure that flue recirculation is not occurring.
Signs of flue gas recirculation include frosted or frozen intake terminals, condensate in the intake terminal and venting system,
oxidation or white chalk material on the flame sensor or igniter shield. Correction to flue recirculation may involve relocating the air
intake to another side of the building, or using inside air for combustion. Check to be sure the intake is not obstructed, especially
during periods of below freezing weather.
High levels of dust and debris such as road and construction dust, insects, and tree pollen may clog the burner resulting in poor
performance and damage to the water heater. Avoid air intake locations where debris can be created such as exhaust ventilation
hoods, gravel parking lots, and near outdoor spotlights that attract bugs. For these installations, an air intake filter kit, part number
239-47330-00A, is available as an accessory service part from the installer of this water heater. The air intake filter kit is not designed
to filter out airborne contaminants or chemicals that may damage the water heater.
NOTICE
Approved Venting Materials
Approved Primers and Cements
NOTICE
NOTICE
CAUTION
CAUTION
For installations in CANADA
• ULC S636 approved CAN-COM VENTING SYSTEM
schedule 40 PVC for flue gas venting rated Class II,
65°C (components provided with water heater)
• IPEX ULC S636 approved schedule 40 PVC (all other
vent pipe/ fittings)
For installations in CANADA
• IPEX ULC S636 approved PVC Primer and Cement for
flue gas venting rated Class II, 65°C
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