Navien NHB H Series Installation And Operation Manual page 40

With 24VAC Connections
(250V 3.15A)
CNC3 CNV3
LWCO ZONE3
CNC6
DHW
Zone valve 3 Zone valve 2
(max. 1A) (max. 1A)
CNC1 CNC4
ZONE2
ZONE3
Thermostat 3 Thermostat 2
NO (Normal Open): Power is supplied when the zone valve is operating, and power turns off when
Note
●
the zone valve stops.
NC (Normal Close): Power is supplied when the zone valve stops, and power turns off when the
●
zone valve is operating.
COM: 24 V AC COMMON
●
The boiler has an internal 24V transformer that is rated for 75VA. This transformer provides power
●
to the zone valve, low water cut-off (LWCO) and thermostat terminals.
If the total power consumption of all 3 zone valves exceeds 72VA, an external zone valve controller
●
must be used.
40 Installing the System Piping
CNB1
CNV2 CNV1
ZONE2 ZONE1
CNG1
CNC2
Zone valve 1
(max. 1A)
CNC5 CNC3
CNC6
ZONE1 DHW
LWCO
Thermostat 1
DHW Aquastat
(priority)
CNB1
CNF1
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
Live
N
Neutral
OUT
System Pump
IN
(max. 2.5 A)
OUT
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