Navien NHB-055 Installation & Operation Manual page 30

3.5.5 System Application - DHW System with Indirect Tank
Make-up Water
Backflow preventer
Pressure reducing valve
DHW Inlet
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 24 for make-up water connections and refer to the requirements of your local codes
to ensure compliance.
Use a pump with an integral check valve or install a check valve at the pump outlet.
Refer to the "3.6.7 Wiring Diagram - DHW System with Indirect Tank" on page 34 for wiring connections.
30 Installing the System Piping
System Pump
Expansion Tank
DHW Outlet
Anti-scald mixing valve
Indirect Tank
Air Separator
Return filter
Boiler Pump
DHW Pump