Ladder Diagram - Navien NCB300-28K 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
36 System Details
NEUTRAL
DC15V
BLDC-FAN
Primary
NCB300 Combi Series
Secondary
Mixing
DC30V
Valve
DC24V
DC 5V
Driving Circuit
MCU 1
Relay 1
Relay 2
Relay 3
Speed Control
Only
Water Adjustment
Valve
Flow Control
Flow Control
HTL switch
Heat Exchanger
WD-RSS
GAS V/V1
Relay 1
Relay 2
Relay 3
Communication
Interface
UART
FRONT
Communication
PANEL
Interface
Igniter
Circulation Pump
3WAY
AC 130V
Trans
Flame rod
MCU 2
ROOM Controller
DC 9V