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Rinnai Tankless Water Heater Installation and Operation Manual
4.5 Vent the Water Heater
4.5.1 Guidelines
•
This water heater is a direct vent water
heater and therefore is certified and listed
with the vent system. You must use vent
components that are certified and listed
with this water heater model.
•
The vent system must vent directly to the
outside of the building and use outside air
for combustion.
•
Refer to Table 9: Approved Vent
Products for the certified and listed vent
components.
•
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.
•
The vent piece connected to the water
heater must be secured with 1 self-tapping
screw.
•
Refer to the instructions of the vent system
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 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 PVC, CPVC, ABS or
galvanized material to vent this appliance.
•
DO NOT combine vent components from
different manufacturers.
•
DO NOT reduce the vent diameter.
•
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.
If reusing existing venting it should be
inspected for damage and to ensure it
is appropriate (approved) for this water
heater. To ensure safe and proper operation,
damaged vent components MUST be replaced
before operating the water heater.
IMPORTANT
WARNING
