Navien NFC-175, Installation & Operation Manual

Page: 43 / 124

About the Boiler 43
3.7.5 Wiring Diagram - the Navien Sma
The Navien Smart Zone + controller may be used with NFC boilers to operate a heating system with more than 3 zones.
When Navien boilers are used with a Navien Sm 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.
AC24VN
AC24VL
lLWCO
R
W
C
T/S_DWH
R
W
C
R
W
C
T/S_CH_ZONE1
T/S_ZONE2
SUPPLY
TEMPERATURE SENSOR
RETURN OUTDOOR T/S_ZONE3
R
W
C
Navien Smartzone
Zone Pump Controller
+
Navien Ready-Link Cable
Refer to the user manual that is supplied with the Navien Sm zone pump controller for details.
Note
The Navien Zone Controller setting must be enabled when using the Ready-Link cable for communication. Refer to “11.3.3 Setting
the Space Heating Operation” on page 89 for details.