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