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 31
Tank T&P
Tankless PRV
Pipe T&P to Open Drain
Aquastat
10°F < Water Heater
Circulation
Pump
Demand Duo™ R-Series (REC) Installation and Operation Manual
Hot Water Supply Line
Building
Circulation
Pump
A
Return Line (Optional)
Set Point
Expansion
Tank
Cold Inlet (Optional)
Building Hot Water
Check
Ball
Valve
Valve
6 inch. B-Vent
Gas Supply
Cold Water Supply
Drain
Union
35