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3
Common Vent
Common venting allows multiple Rinnai Tankless Water Heaters to share the same vent system.
Rinnai water heaters can only be common vented with Schedule 40 PVC/CPVC or with the Rinnai certified common
vent system.
Example: Rinnai Common Venting
General Guidelines
When installing Common Vent, follow these guidelines:
•
Use only the materials listed in this manual for vent,
air intake pipe, and fittings. Failure to comply with this
warning could result in property damage, personal
injury, or death.
•
When cutting vent components, ensure that the cuts
are straight.
•
Chamfer and deburr all edges before installing the
components.
•
Vent joints must not leak. Confirm gas tight
connections of every vent joint.
•
Before operating the water heater(s), ensure vent
system is clean and free of debris.
•
Vent system must be supported according to the vent
manufacture's installation instructions.
•
Venting should be as direct as possible with a
minimum number of fittings.
•
The common vent system must only be installed by a
trained and qualified professional.
COMMON VENT TERMINATION CLEARANCES
•
Vent termination per ANSI Z223.1/NFPA 54. For
clearances not specified in ANSI Z223.1/NFPA 54,
clearances are in accordance with local installation
codes and the requirements of the gas supplier.
•
Refer to section "3.5 Vent the Water Heater" for
additional clearance requirements specific to the
Rinnai Commercial Hybrid System Installation and Operation Manual
(Indoor Units Only. Direct Vent and Non-Direct/Room Air Vent)
Example: Schedule 40 PVC/CPVC
Common Vent
WARNING
DO NOT slope the combustion air pipe toward unit.
Failure to comply with this warning could result in
property damage, personal injury, or death.
DO NOT apply PVC/CPVC glues, solvents, or
cleaners to the tankless water heater's intake or
exhaust gasket connections. Failure to correctly
assemble the components according to these
instructions may result in property damage,
personal injury, or death.
DO NOT
DO NOT obstruct combustion air flow or exhaust
gas flow in the venting system.
DO NOT install the water heater in an area with
negative air pressure.
DO NOT combine the common vent system with
existing vents, chimneys, or vent pipes connected
to other water heaters, boilers or appliances.
DO NOT common vent different Rinnai models in a
single common vent system.
DO NOT use cellular core PVC/CPVC, Radel, ABS or
galvanized materials.
DO NOT combine vent components from different
manufacturers.
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