Navien NHB Series, Installation & Operation Manual

Page: 34 / 135

34 Installing the System Piping
3.5.3 System Application - Air Handler System
Air Flow
Air Handler
Make-up Water
Air Separator
Expansion Tank
Backflow preventer
Pressure reducing valve
Return filter
Pressure
Relief Valve
Air Vent
Air Vent
Bushing
Return
Auto Air
vent
Pressure
Relief Valve
Air Vent Busing
Double Nipple
Tee
Supply
<Alternate Top Connections>
Note Ɣ
System application drawings are intended to explain the system piping concept only.
Ɣ Install a filter in the system return to remove foreign objects from the system. Foreign objects inside the system may result in
abnormal system operation.
Ɣ
Refer to “3.3 Filling the System” on page 29 for make-up water connections and refer to the requirements of your local codes
to ensure compliance.
Ɣ
Air handlers with an internal pump shall be piped either with a crossover pipe at the AHU or in a primary/secondary
configuration with the boiler.
Ɣ
Refer to the “3.6.7 Wiring Diagram - Air Handler” on page 42 for wiring connections.
Ɣ
You can use a secondary piping configuration for the air handler system to maintain optimal flow and heat capacity.
Ɣ
Depending on the installation environment, the supply top and return top piping option can be applied.