Ladder Diagram - Navien NPN Installation & Operation Manual

6.4 Ladder Diagram

HOT NEUTRAL
120 V AC
EMI
FILTER
PWM
Transformer
DC 24 V
DC 12 V
5 V
Flow Sensor
APS
Fan
Hall Sensor
Water Leakage
Detection
Antifreeze
Thermistor
Outlet
Thermistor 1
Outlet
Thermistor 2
Inlet
Thermistor 1
HTL switch
Heat Exchanger
58 Appendixes
HOT
DC 15 V
Primary
Sencondary
FAN
Mixing Valve
Flow Control
Modulation
GV
MCU 1
Relay 2
Relay 4
UART
Communication
Interface
Main GV
Relay 1
SGV 1
Relay 2
SGV 2
Relay 3
SGV 3
Relay 4
SGV 4
Relay 5
Igniter
Relay 6
Pump
Relay 7
Relay 8 Anti Freeze heater
Speed Control
Water Adjustment
Valve
Flow Control
Flame rod
WD-RSS
Communication
Interface
Relay Power Supply
Driving Circuit
Relay 1
Relay 3
Relay 5
Relay 6
Relay 7
Relay 8
FRONT
PANEL
NEUTRAL
AC 130 V
Trans
DC 9.1 V
MCU 2
Ready Link
Ready Link
Interface