Vent The Water Heater - Rinnai SENSEI RSC160i 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 applica-
tions.
• When installed as Direct Vent, refer to
the "Direct Vent Approved Vent Manufac-
turers and Products" section (within sec-
tion "4.5.4 1. Direct Vent") for a complete
list of approved vent manufacturers and
products.
• 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 ac-
cepted 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
manufacturer'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
connections must be firmly pressed
together so that the connections form an
air tight seal. Follow the venting manu-
facturer's instructions.
• Refer to the PVC/CPVC manufacturer
for appropriate fittings, solvents or join-
ing methods.
• The vent piece connected to the water
heater must be secured with 1 self-tap-
ping screw.
• Refer to the instructions of the vent sys-
tem manufacturer for component assem-
bly instructions.
26
• 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 trained and
qualified professional or the local inspec-
tor.
• Any issues resulting from improper vent
installation will not be covered by warranty.
• 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.
Rinnai Tankless Water Heater Installation and Operation Manual
WARNING