Vent The Water Heater - Rinnai Sensei CU199i Installation And Operation Manual

4.5 Vent the Water Heater

4.5. 1 Guidelines
• Internal water heaters can be installed as
direct vent or non-direct vent applications.
• When installed as Direct Vent, refer to the
"Direct Vent Approved Vent Manufactur-
ers and Products" section (within section
"4.5.4. 1. Direct Vent") for a complete list of
approved vent manufacturers and prod-
ucts.
• When installed as Non-Direct Vent (Room
Air), the vent must be Category IV, listed
by a national recognized testing agency or
schedule 40 PVC when accepted by local
codes.
• Exhaust must be directly vented to the
outside. Combustion air can be provided
from outside (Direct Vent) or from room air
(Non-Direct Vent).
• If using room air (non-direct vent) for
combustion, ensure the required volume
of indoor air is available according to the
National Fuel Gas Code, ANSI Z223.1/
NFPA 54.
• Avoid dips or sags in horizontal vent runs
by installing supports per the vent manu-
facturer's instructions.
• Support horizontal vent runs every 4 ft
(1.2 m) and all vertical vent runs every 6 ft
(1.83 m) or as per vent
manufacturer's instructions or local code
requirements.
• Venting should be as direct as possible
with a minimum number of pipe fittings.
• For manufactured vent systems, vent con-
nections must be firmly pressed together
so that the connections form an air tight
seal. Follow the venting manufacturer's
instructions.
• Refer to the PVC/CPVC manufacturer for
appropriate fittings, solvents or joining
methods.
• The vent piece connected to the water
heater must be secured with 1 self-tapping
screw.
• Refer to the instructions of the vent system
Rinnai Tankless Water Heater Installation and Operation Manual
manufacturer for component assembly
instructions.
• If the vent system is to be enclosed, it is
suggested that the design of the enclosure
shall permit inspection of the vent system.
The design of such enclosure shall be
deemed acceptable by the installer or the
local inspector.
• Any issues resulting from improper vent
installation will not be covered by warranty.
WARNING
• DO NOT use cellular core PVC/CPVC.
• DO NOT use Radel or galvanized material
to vent this appliance.
• DO NOT cover non-metallic vent pipe and
fittings with thermal insulation.
• DO NOT combine vent components from
different manufacturers.
• DO NOT reduce the vent diameter. Vent
diameter cannot be less than 2 in. (51
mm).
• DO NOT connect the venting system with
an existing vent or chimney.
• Do not common vent with the vent pipe of
any other manufacturer's water heater or
appliance. Rinnai water heaters can only
be common vented with Schedule 40 PVC/
CPVC or with a Rinnai certified common
vent system.
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