Navien NHB Series Installation & Operation Manual page 35

3.5.4 System Application - DHW System with Indirect Tank (Primary/Secondary Piping)
System Pump
Air Separator
Return filter
Make-up Water
Backflow preventer
Pressure reducing valve
Expansion Tank
Anti-scald mixing valve
Indirect Tank
Boiler Pump
DHW Pump
DHW Inlet
DHW Outlet
System application drawings are intended to explain the system piping concept only.
Note
Install a filter in the system return to remove foreign objects from the system. Foreign objects inside the system may result in
abnormal system operation.
Refer to "3.3 Filling the System" on page 29 for make-up water connections and refer to the requirements of your local codes
to ensure compliance.
Refer to the "3.6.8 Wiring Diagram - DHW System with Indirect Tank" on page 43 for wiring connections.
Installing the System Piping 35