Navien NaviCirc Installation And Operation Manual page 59

2.4.3.2 Wiring Diagram - External LWCO
T/S_ZONE3
C
W
The boiler supplies 24 VAC at the LWCO power terminals
Note
(CNC3).
For terminal type LWCO appliances, a typical wiring method is
shown below (same voltage for control and burner circuit):
T/S_ZONE2 T/S_ZONE1
R C R C
W W
Jumper
Neutral Line
To Boiler LWCO Terminals
LWCO
Line
lLWCO
AC24VL
AC24VN
Line
Neutral
LWCO
Terminals
LWCO
59
LWCO