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Fig 14 - Functional Wiring Diagram
Fuse F1
ST 12 Pin L
(2A Slow)
LIVE
IN
ST 12 Pin N
ST 23
Brown
X2
Pin 1
REL 1
Electronics
X3
Pin 1
ST 15
Pin L
Brown
Brown
CH
DWH
Pump
Pump
Mains
Indicator
Green
Electronics
Room
On/Off
Thermostat
Switch
ST8
(Ls)
From Main
Control Board
X1
Grey
Pin 1
Relay
REL 3
Electronics
ST1
Centre
Pin
HIGH
White
LOW
PUMP
CONTROL
Fan
BOARD
(2 speed)
Spark
Electrodes
Spark
Fuse F2
(1.25A Slow)
Transformer
Convert AC to low
voltage electrics
ST8
(Ns)
ST8
(Lr)
Optional Link
REL 4
Electronics
ST 1
Pin L
Red
11
CH
DHW
Flame
Demand
Demand
Detect
Indicator
Indicator
Indicator
Red
Red
Red
Indicators
MAIN CONTROL
BOARD
Electronics/
microprocessor
(Safety Low Voltage)
Settings
DHW Control Knob
CH Control Knob
CH pressure adjust pot
Gas Valve Mode
Reset Button
N
N
Regulator Valve
Main Valve
Main Valve
Pump Control
Board
Flow Switch
CH Sensor
DWH Sensor
Air Pressure
Switch
Flame Sense
Over-Heat
Cut Off
24V Programmer
Water Pressure
Switch
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