Rinnai CU199i - Page 30

30 Rinnai Tankless Water Heater Installaon and Operaon Manual
Twin Pipe Installaon Instrucons
DO NOT apply PVC glues, solvents, or cleaners to the water heater’s combuson air or exhaust
gasket connecons. Failure to correctly assemble the components according to these instrucons
may result in property damage, personal injury, or death.
WARNING
The water heater is equipped with a 2 in. (51 mm) pipe connecon. With the use of a pipe reducer, installers can use a
3 in. (76 mm) pipe for the combuson air and exhaust.
Remove and discard the screw from the
combuson air vent connecon.
Remove and discard the combuson
air vent cap.
Install the combuson air vent pipe.
Ensure it is properly seated.
Secure the combuson air vent pipe to the
combuson air vent connecon with the
supplied screw.
Install the exhaust vent pipe. Ensure it is
properly seated.
Secure the exhaust vent pipe to the exhaust
adapter ring with the supplied screw.
Combuson Air Vent Pipe
Supplied screw
Exhaust Vent Pipe
Supplied screw
Direct Vent (Twin Pipe)
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1
2
3
4