Rinnai Commercial Hybrid System Installation and Operation Manual
15
Venting
5
Venting Guidelines
•
When installed as direct vent, the vent system
certified and listed with the appliance. You must use
vent components that are certified and listed with
the water heater model.
•
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.
•
Engineered vent systems 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.
•
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.
•
Refer to the instructions of the vent system
manufacturer for component assembly instructions.
WARNING
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.
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 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.
NOTICE
For venting information not specified in this section, refer to the Installation and Operation Manual for Commercial
CU199 Condensing Tankless Water Heaters (supplied with each tankless water heater). This manual includes complete
venting information, including approved vent manufacturers and terminations.
NOTICE
