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12.3 Ladder Diagram
LIVE
240 VAC
EMI
FILTER
PWM
Transformer
DC24V
DC12V
DC 5V
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
NEUTRAL
DC15V
BLDC-FAN
Primary
NCB500/700 Combi
Secondary
Series Only
Mixing
DC30V
Valve
Driving Circuit
MCU 1
Communication
Relay 1
Relay 2
Relay 3
Speed Control
Water Adjustment
Valve
Flow Control
Flow Control
Flame rod
HTL switch
Heat Exchanger
WD-RSS
GAS V/V1
Relay 1
Relay 2
Relay 3
Communication
Interface
UART
FRONT
PANEL
Interface
Igniter
Circulation Pump
3WAY
AC130
V
Trans
MCU 2
ROOM Controller
DC 9V
Appendices
91
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