Ladder Diagram - Navien NCB-700-2S+/42K Service Manual

4.6 Ladder Diagram

LIVE 240 VAC
EMI
FILTER
PWM
Transformer
DC12V
Flow Sensor
WPS
Fan
Hall Sensor
Vent
Separation
Detector
Exhaust
Thermistor
Inlet
Thermistor 1
Supply
Thermistor
Outlet
Thermistor 1
Return
Thermistor
Outlet
Thermistor 2
Outdoor
Thermistor
HTL switch
Buner
Low water
Pressure switch
42 System Details
NEUTRAL
DC15V
BLDC-FAN
Primary
Sencondary
Mixxing
DC30V
Valve
DC24V
DC 5V
Driving Circuit
MCU 1
Relay 1
Relay 2
Relay 3
Speed Control
NCB500/700 Combi
Serise Only
Water Adjustment
Valve
Flow Control
Flow Control
HTL switch
Heat Exchanger
WD-RSS
Communication
Interface
UART
FRONT
Communication
Interface
Igniter
Circulation Pump
3WAY
AC130 V
Flame rod
GAS V/V1
Relay 1
MCU 2
Relay 2
Relay 3
ROOM Controller
PANEL
Trans
DC 9V