Determining Vent Configuration - Rinnai RUCS65i Installation And Operation Manual

Venting Guidelines
DO NOT

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 fittings
with thermal insulation.

Do not combine vent components from different
manufacturers.

Vent diameter must not be reduced.

Do not connect the venting system with an
existing vent or chimney.

Do not common vent.
MUST DO

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 the water heater model.

The vent system must vent directly to the outside
of the building and use outside air for combustion.

Avoid dips or sags in horizontal vent runs by
installing supports per the vent manufacturer's
instructions.

Support horizontal vent runs every four feet and
all vertical vent runs every six feet or in
accordance with local codes.

Venting should be as direct as possible with a
minimum number of pipe fittings.

Vent connections must be firmly pressed together
so that the gaskets form an air tight seal.

The vent piece connected to the water heater
must be secured with one self-tapping screw.
INFORMATION

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 permit inspection
of the vent system. The design of such enclosure
shall be deemed acceptable by the installer or the
local inspector.
NOTICE
If it becomes necessary to access an enclosed vent
system for service or repairs, Rinnai is not responsible
for any costs or difficulties in accessing the vent
system. The warranty does not cover obtaining
access to a vent system in an enclosed environment.

Determining Vent Configuration

Prior to the installation of the vent system, the dip
switches on the PCB board must be properly set for
the venting configuration selected for the application.
(Unit comes defaulted for concentric applications)
Venting Dip Switch Settings
Venting Style
Concentric
Twin Pipe
KCM Series Manual
SW4 in DIPSW 2
OFF
ON
DIPSW 1
DIPSW 2
SW4
OFF-Concentric
ON-Twin Pipe
13