Rinnai Demand Duo CX Series Installation Instructions Manual page 24

Direct Vent
1
The water heater is equipped with a 2 in.
(51 mm) pipe connection. With the use of a
pipe reducer, installers can use a 3 in.
(76 mm) pipe for the
exhaust. In this case, a 2 in./3 in. pipe
reducer should be installed as close as
possible to the water heater.
WARNING
DO NOT apply PVC glues, solvents, or
cleaners to the water heater's intake air or
exhaust gasket connections. Failure to
correctly assemble the components
according to these instructions may result
in property damage, personal injury, or
death.
1. Remove and discard the screw from
the intake air vent
Figure 26
2. Remove and discard the
cap.
Figure 27
Demand Duo H-Series with SENSEI CX Installation Instructions
(Twin Pipe)
Intake air and
connection.
intake air vent
3. Install the intake air vent pipe. Ensure it
is properly seated.
Secure the intake air vent pipe to the
intake air vent connection with the
supplied screws.
Figure 28
Intake Air Vent Pipe
4. Install the exhaust vent pipe. Ensure it
is properly seated.
Secure the exhaust vent pipe to the
exhaust adapter ring with the supplied
screws.
Figure 29
Supplied
screws
Exhaust
Supplied
screws
24