Navien NHB H Series Installation And Operation Manual page 41

3.6.6 Wiring Diagram - the Navien Smartzone+
The Navien Smartzone+ controller may be used with the NHB-H 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.
Fuse
(250V 3.15A)
CNC1 CNC4 CNC5 CNC6
ZONE3 ZONE2 ZONE1 DHW
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
Note
communication. Refer to "11.8 Setting the Space Heating Operation" on page 104 for details.
CNB1
CNC3 CNV3 CNV2 CNV1
LWCO ZONE3 ZONE2 ZONE1
CNG1
CNC2
+
Navien Ready-Link Cable
CNF1
Installing the System Piping 41