Navien NFC-250/175H Installation Manual page 39

3.6.5 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 result in abnormal system operation.
Refer to "3.4 Filling the System" on page 32 for make-up water connections and refer to the
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requirements of your local codes to ensure compliance.
Air handlers with an internal pump shall be piped either with a crossover pipe at the AHU or in a
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primary/secondary configuration with the boiler.
Refer to the "3.7.9 Wiring Diagram - Air Handler" on page 54 for wiring connections.
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You can use a secondary piping configuration for the air handler system to maintain optimal flow
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and heat capacity.
Expansion Tank
Air Flow
Air Handler
Air Separator
Make-up Water
preventer
Pressure reducing
Installing the System Piping
Backflow
valve
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