41
Installing the System Piping
3.7.3 Wiring Diagram - Zone Pump System
NCB-H boilers can operate a heating system with up to 3 zones. The following is the wiring diagram for a zone
pump system with 3 zones.
Without 24VAC Connections
N
A/H
DHW
PRI
L
N
L
N
L
N
L
N
L
Z3
Z2
Z1
SUPPLY
TEMPERATURE SENSOR
RETURN
OUTDOOR
T/S_ZONE3
R
W
C
T/S_ZONE2
R
W
C
T/S_ZONE1
R
W
C
AC24VN
AC24VL
lLWCO
R
W
C
T/S
_R
ecir
COM
NO
NC
ZONE
_V
/V3
COM
NO
NC
ZONE
_V
/V2
COM
NO
NC
ZONE
_V
/V1
SUPPLY
TEMPERATURE SENSOR
RETURN
OUTDOOR
T/S_ZONE3
R
W
C
T/S_ZONE2
R
W
C
T/S_ZONE1
R
W
C
Thermostat 3
Thermostat 2
Thermostat 1
N
A/H
DHW
PRI
L
N
L
N
L
N
L
N
L
Z3
Z2
Z1
Zone pump 1
(max. 2.5 A)
Zone pump 2
(max. 2.5 A)
Zone pump 3
(max. 2.5 A)
Pump Ground
Note
●
If you have a 24 V thermostat, connect it to the R & C terminals on the boiler’s PCB.
●
The C terminals are for optional connections with 24 V thermostat COMMON.
Summary of Contents for NCB-190/060H
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