Navien NHB H Series Installation And Operation Manual page 37

3.6.4 Wiring Diagram - Zone Pump System with DHW Tank
The NHB-H boilers can operate a heating system with up to 2 zones and 1 DHW Tank. The following is the wiring
diagram for a zone pump system with 2 zones and 1 DHW Tank.
Without 24VAC Connections
(250V 3.15A)
CNC1 CNC4
ZONE3 ZONE2
Thermostat 3 Thermostat 2
The C terminals are for optional connections with 24 V thermostat COMMON.
Note
●
If the DHW Tank is connected to the priority terminal, the T/S Zone 1 input is not available.
●
CNC5 CNC3
CNC6
ZONE1 DHW
LWCO
Thermostat 1
DHW Aquastat
(priority)
CNB1
CON1
L
ZONE3 Pump FUSE
(250VAC_10A)
ZONE2 Pump FUSE
(250VAC_10A)
CNV3 CNV2 CNV1
ZONE3 ZONE2 ZONE1
ZONE1 Pump FUSE
(250VAC_10A)
CNC2
Boiler Pump FUSE
(250VAC_10A)
Pump Ground
CNA1
CON2
N
Live
Neutral
OUT
Zone Pump 3
IN
(max. 2.5 A)
OUT
Live
IN
Neutral
OUT
Zone Pump 2
(max. 2.5 A)
IN
CNG1 CNF1
Live
CNP1
Neutral
DHW Pump
(max. 2.5 A)
OUT
Live
IN
Neutral
CNP2
Boiler Pump
(max. 2.5 A)
OUT
IN
Installing the System Piping 37