Navien NFB Series User Manual

About the Boiler 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.
NC
NC
COM
NC
NC
COM
LWCO
AC24VL
AC24VN
NC
NC
COM
ZONE1ZONE2ZONE3
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 Smartzone+ 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 86 for details.

Navien NFB Series Specifications

General

Type	Condensing Boiler
Fuel Type	Natural Gas or Propane
Heat Exchanger	Stainless Steel
Vent Type	Direct Vent
Vent Diameter	2" or 3"