Navien NCB-180 Installation & Operation Manual page 31

3.6.4 System Application - Air Handler System
Air Separator
Expansion Tank
Air Flow
Air Handler
30 Installing the System Piping
The boiler performs automatically System
Note
●
application drawings are intended to
explain the system piping concept only.
Refer to 3.4 System Fill Connection on
●
page 25 for make-up fill connections
and refer to the requirements of your local
codes to ensure compliance.
Boiler side piping to the air handler
●
which exceeds the capabilities of the
internal boiler circulator requires primary/
secondary piping configuration with a
separate system circulator.
Air handlers with an internal circulator
●
shall be piped either with a crossover pipe
at the AHU or in a primary/secondary
configuration with the boiler.
Wiring Diagram
<Air Handler>
CN23 CN10
Thermostat
<NCB>
CN24 CN25
Common Hot