Navien NFB-175 Mode D'emploi page 32

3.5.4 System Application - Air Handler System
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.
Air handlers with an internal pump shall be piped either with a crossover pipe at the AHU or in a primary/secondary
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configuration with the boiler.
Refer to the "3.6.9 Wiring Diagram - Air Handler" on page 43 for wiring connections.
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You can use a secondary piping configuration for the air handler system to maintain optimal flow and heat capacity.
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32 Installing the System Piping
System Pump (Boiler Pump)
Expansion Tank
Return filter
Air Separator
Air Flow
Air Handler
Make-up Water
Backflow preventer
Pressure reducing valve