Navien NFC-250/175H Installation Manual page 52

3.7.6 Wiring Diagram - the Navien SmartZone +
The Navien Smart Zone + controller may be used with NFC-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.
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 "11.5.2 Setting the Space Heating Operation" on page 112 for details.
52 Installing the System Piping
lLWCO
AC24VL
AC24VN
SUPPLY RETURN OUTDOOR T/S_ZONE3 T/S_ZONE2 T/S_ZONE1
TEMPERATURE SENSOR R W C R W C R W C
+
Navien Ready-Link Cable