KCM Series Manual 13
Venng Guidelines
Do not use cellular core PVC/CPVC.
Do not use Radel, ABS, or galvanized material to
vent this appliance.
Do not cover non-metallic vent pipe and ngs
with thermal insulaon.
Do not combine vent components from dierent
manufacturers.
Vent diameter must not be reduced.
Do not connect the venng system with an
exisng vent or chimney.
Do not common vent.
This water heater is a direct vent water heater and
therefore is cered and listed with the vent
system. You must use vent components that are
cered and listed with the water heater model.
The vent system must vent directly to the outside
of the building and use outside air for combuson.
Avoid dips or sags in horizontal vent runs by
installing supports per the vent manufacturer’s
instrucons.
Support horizontal vent runs every four feet and
all vercal vent runs every six feet or in
accordance with local codes.
Venng should be as direct as possible with a
minimum number of pipe ngs.
Vent connecons must be rmly pressed together
so that the gaskets form an air ght seal.
The vent piece connected to the water heater
must be secured with one self-tapping screw.
Refer to the instrucons of the vent system
manufacturer for component assembly
instrucons.
If the vent system is to be enclosed, it is suggested
that the design of the enclosure permit inspecon
of the vent system. The design of such enclosure
shall be deemed acceptable by the installer or the
local inspector.
If it becomes necessary to access an enclosed vent
system for service or repairs, Rinnai is not responsible
for any costs or dicules in accessing the vent
system. The warranty does not cover obtaining
access to a vent system in an enclosed environment.
Concentric OFF
Twin Pipe ON
Prior to the installaon of the vent system, the dip
switches on the PCB board must be properly set for
the venng conguraon selected for the applicaon.
(Unit comes defaulted for concentric applicaons)
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