Rinnai Demand Duo R Series Installation And Operation Manual page 35

Single Unit Circulation
Note:
Installation must conform to applicable codes and all requirements listed in this manual. Balancing valves, equivalent piping , pressure gauges,
and temperature gauges are to be used as necessary to ensure proper flow between units.
All components shall be selected for the pressure and temperature rating of the installation.
Figure 32
Tank T&P
Pipe T&P to Open Drain
Demand Duo™ R-Series Installation and Operation Manual
Hot Water Supply Line
Tankless PRV
Building
Circulation
Pump
6 inch. B-Vent
Building Hot
Water
Return Line
(Optional)
Gas Supply
Cold Water Supply
35