Navien NFC-175 Installation & Operation Manual page 33

3.6.4 System Application - Air Handler System
Pressure
Relief Valve
Air Vent
System application drawings are intended to explain the system piping concept only.
Note
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Install a NaviClean filter in the system return to remove foreign objects from the system. Foreign objects inside the system may
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result in abnormal system operation.
Refer to "3.4 Filling the System" on page 28 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 "3.7.8 Wiring Diagram - Air Handler" on page 45 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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NaviClean
Expansion Tank
Air Flow
Air Handler
Air Separator
Backflow preventer
Pressure reducing valve
Make-up Water
Installing the System Piping 33