Navien NCB-240/110H User Manual

132 Appendixes
12.3 Ladder Diagram
UART
Communication
Interface
CASCADE
(RS-485)
Front Panel
Communication
Interface
Air Handler
Output
DHW Priority
Terminal Board
Relay 9
Output
Relay 10
Zone2 Thermostat
R,W,C
R,W,C
LIVE NEUTRAL
DC24V
DC12V
DC5V
H.T.L 1
Fan
Speed Control
Primary
WPS
Fan
Hall Sensor
OUTLET2
Thermistor
Exhaust
Thermistor 1
Heating Supply
Thermistor
PWM
SMPS
Primary
Secondary
Dip Switch
Zone1 Thermostat
R,W,C
LWCO
Flame Rod
Linear
Trans
AC 24V
AC INPUT(AC 120V)
3.15A
Relay 4
Boiler Pump
Relay 1
10A
10A
10A
ZONE1 Pump
Relay 3
ZONE3 Pump
Relay 2
ZONE2 Pump
WD-PSS
Heating Return
Thermistor
System Return
Thermistor
INLET
Thermistor
System Supply
Thermistor
Outdoor
Thermistor
1 2 3 4 5 6
O
N
O
N
1 2 3 4 5 6 7 8
APS
H.T.L 2
MGV1
MGV2
Relay 1
Relay 2
Relay 3
Relay 4
Relay 5
Relay 6
Relay 7
Relay 8
Relay 9
Relay 10
MCU 1 MCU 2
Terminal Board
LIVE NEUTRAL
AC INPUT(AC 120 V)
10A
Relay 5
Recirculation Pump
Dual Venturi
Relay 6
Relay 7
Ignitor
Relay 8
3-Way Valve
DC15V
Zone3 Thermostat
R,W,C
External R/C Thermostat
Mixing Valve 1
Mixing Valve 2
Flow Sensor
AWS Valve
3-Way
Valve
Vent Installation Detector
OUTLET
Thermistor
20A
EMI
FILTER
Relay 11
Relay 12
Relay 13
Zone Valve 3
Zone Valve 2
Zone Valve 1

Navien NCB-240/110H Specifications

General

Brand	Navien
Model	NCB-240/110H
Category	Boiler
Language	English