Installation Manual

Demand Duo™ H-Series Installation and Operation Manual 41
Commercial Hybrid Single Unit Circulation
Note:
Installation must conform to applicable code and all requirements listed in the installation manual. Balancing valves, equivalent piping, pressure
gauges, and temperature gauges are to be used as necessary to ensure proper flow between units.
Condensate piping shall be CPVC or PVC material and shall not be smaller than the drain connection on the appliance.
Components of condensate drainage shall be CPVC or PVC material. All components shall be selected for the pressure and temperature rating of
the installation.
Where the drain pipes from more than one unit are manifolded together for condensate drainage, the pipe or tubing shall be sized in accordance with
an approved method as dictated by local codes.
Condensate must be disposed of according to local codes.
Building Hot Water Supply Line
Condensate Drain Line
Pipe T&P to Open Drain
Building Circulation
Pump
Gas Supply
Building Hot Water
Return Line (Optional)
Cold Water Supply
Tank
T&P
Tankless
PRV
Figure 43