Installation Manual

Demand Duo™ R-Series Installation and Operation Manual 16
• This water heater must be vented vertically to
the outside of the building or structure.
• This water heater is not designed or certified
for side wall horizontal vent terminations.
• All installations must be vented in accordance
with National Fuel Gas Code, ANSI Z223.1/
NFPA 54 - latest edition and the requirements
of state or local codes. In Canada, the water
heater must be vented in accordance with the
National Standard of Canada, and CAN/CSA
B149.1 - latest editions and amendments and
the codes of the local utility or other authority
having jurisdiction.
To prevent possible
personal injury or death
due to asphyxiation, common venting with other
manufacturer’s induced draft appliances is not
allowed.
WARNING
Devices attached to the
vent system intended to
increase system efficiency by reducing the heat
loss of the vent system MUST not be used on this
water heater. Rinnai accepts no liability for
damage or injury if such devices are installed on
the vent system with this appliance.
WARNING
Vent Pipe Assembly: To
avoid damage to the vent
and intake filter exhaust connector (IFEC), pre
drill holes with a 1/8 in. drill bit. Attach the vent to
the vent adapter with #8 screws. Refer to the
“Vent Pipe Assembly” section on the following
page for more information.
WARNING
• All vent (Category I) passing through a
concealed space, an attic or floor, MUST be
Type B double-wall vent and/or Type B
double-wall vent connectors.
• This appliance CANNOT be vented into any
chimney serving an open fireplace or any
other solid fuel burning appliance.
• Use the same diameter Category I connector
or vent as permitted by NFPA 54/ANSI
Z223.1 venting tables.
• The vent must be 6 in. or larger in diameter. It
is not permitted to reduce vent diameter (6
in.).
• Vertical Category I vent or vent connector
runs must be as short and direct as possible.
• Vertical outdoor runs of type B or ANY single
-wall vent below the roof line are NOT
permitted.
• All horizontal vent runs to be sloped up away
from this appliance a minimum of ¼ in. (6
mm) per foot (21 mm per meter). See Figure
8 under “Vent Connectors” section.
Poison carbon
monoxide gas hazard.
If this appliance is replacing a previously
common vented water heater, it may be
necessary to resize the existing chimney liner or
vent to prevent over sizing problems for the other
remaining appliance(s). See codes and/or
standard having jurisdiction. Failure to properly
vent this water heating appliance or other
appliance(s) can result in death, personal injury
and/or property damage.
WARNING
Topics in this section
• Venting Requirements
• Combustion Air Requirements
• Venting Installation Checklist
NOTE
The maximum horizontal length of a
single-wall connector shall be 75% of
the height of the chimney.