43
Installing the System Piping
3.6.6 Wiring Diagram - the Navien Sma
The Navien Smart Zone + controller may be used with the NFB-H 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.
NC
NC
COM
NC
NC
COM
LWCO
AC24VL
AC24VN
NC
NC
COM
ZONE1
ZONE2
ZONE3
COM
NO
NC
ZONE1
COM
NO
NC
ZONE2
COM
NO
NC
ZONE3
AC24VN
SUPPLY
RETURN
OUTDOOR
DHW TANK
AC24VL
LWCO
R
W
C
R
W
C
R
W
C
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 “11.5.2 Setting the Space Heating Operation” on page 101 for details.
Summary of Contents for NFB-175H
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