Navien NFB-175 Mode D'emploi page 41

3.6.6 Wiring Diagram - the Navien SmartZone +
The Navien Smart Zone + controller may be used with the NFB Boilers to operate a heating system with more than 3 zones.
When Navien boilers are used with a Navien Smartzone+ zone pump controller, an RS-485 data communication link is established through the
Ready-link connection. This allows the controller and the boiler to share operational information and to control the zones more efficiently by
minimizing unnecessary pump operation. The communication link also provides an optimal control environment for freeze protection.
Navien Smartzone
Zone Pump Controller
Refer to the user manual that is supplied with the Navien Smartzone+ zone pump controller for details.
The Navien Zone Controller setting must be enabled when using the Ready-Link cable for communication. Refer to "11.3.3 Setting
Note
the Space Heating Operation" on page 86 for details.
NC
NC
NC
COM
NO
NC
COM
NC
NC
COM
NO
NC
COM
NC
NC
COM
NO
LWCO
COM
AC24VL
LWCO
AC24VN
AC24VL
AC24VN
C
W
R
C
W
R
C
W
R
C
W
SUPPLY RETURN OUTDOOR DHW TANK
R
+
Navien Ready-Link Cable
About the Boiler 41