Navien NFB-175 Mode D'emploi page 33

3.5.5 System Application - DHW System with Indirect Tank (Primary/Secondary Piping)
System application drawings are intended to explain the system piping concept only.
Note
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Install a filter in the system return to remove foreign objects from the system. Foreign objects inside the system may result in
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abnormal system operation.
Refer to "3.3 Filling the System" on page 27 for make-up water connections and refer to the requirements of your local codes
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to ensure compliance.
Use a pump with an integral check valve or install a check valve at the pump outlet.
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Refer to the "3.6.10 Wiring Diagram - DHW System with Indirect Tank" on page 43 for wiring connections.
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Return filter
Boiler Pump
DHW Pump
System Pump
Air Separator
Anti-scald mixing valve
Indirect Tank
DHW Inlet
DHW Outlet
Make-up Water
Backflow preventer
Pressure reducing valve
Expansion Tank
Installing the System Piping 33