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Fig.10. Boiler wiring diagram
Flame
Sense
Electrode
Spark
Electrode
Gas Valve
Air pressure
switch
Overheat
Thermostat
Fan
Control Board
X1
X2
X3
X4
X5
X6
1
orange
1
1
X7
User control
potentiometer/switch
black
white
brown
grey
violet
red
violet
red
black
orange
brown
grey
white
NC
NO
COM
Temperature
sensor
Pump Live
Pump Neutral
Permanent Neutral
Permanent Live
Switched Live (Boiler Demand)
earth
Installer
Connections
blue
brown
*
*
*
Polarity of these connections is not
important.
*
3 pin header