Rinnai RUCS65i series Installation And Operation Manual page 25

Installation of PVC/CPVC Vent and Intake Air Piping:
Adapter Installation Configurations:
Note the correct position of the combustion air inlet and gas flue outlet, as these are NOT interchangeable. For
the correct position and design of the twin pipe gas flue outlet and combustion air inlet refer to the installation
instructions in this manual.
DO NOT apply PVC glues, solvents, or cleaners to the water heaters intake or exhaust gasket connections.
The RUCS series units do not require additional parts to be used with standard 3" 3rd party solid core PVC/
CPVC pipes; refer to figure below for required parts for 3" PVC/CPVC assembly configuration.
3" SCH 40 PVC/CPVC Elbows
(female unthreaded socket ends)
Components by others
(displayed as example),
not included with unit
Included with
(To be removed and discarded
for twin pipe configuration)
Conversely, the RUCS series units require 2 additional (4"x 3" Flush – Schedule 40 PVC) bushing to be used with
4" SCH 40 PVC/CPVC Elbows
(female unthreaded socket ends)
Components by others
(displayed as example),
not included with unit
Included with
(To be removed and discarded
for twin pipe configuration)
Failure to correctly assemble the components according to these instructions may result in property damage,
personal injury, or death.
WARNING
Required Parts For 3" PVC/CPVC Assembly Configuration
Combustion Air
Intake Cap
Required Parts For 4" PVC/CPVC Assembly Configuration
4" PVC/CPVC assembly configuration (refer to figure below).
Combustion Air
Intake Cap
WARNING
KCM Series Manual
Exhaust
3" standard - wall white
PVC/CPVC unthreaded pipe
(SCH 40 sold core)
Exhaust Adapter Ring
(To remain, required for
twin pipe configuration)
Exhaust
4"X 3" flush bushing
(SCH 40 PVC/CPVC) or any other
reducer type fitting
3" standard - wall white
PVC/CPVC unthreaded pipe
(SCH 40 sold core)
Exhaust Adapter Ring
(To remain, required for
twin pipe configuration)
25