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2 General Safety Instructions
2.6 Information about connecting the flame sensor
WARNING!
It is important that signal transmission be as free of interference and loss as possible
Do not lay the sensor lead with other leads – lead capacities decrease the size of the flame
signal – use a separate cable.
Observe the permitted length of the sensor leads.
The mains-operated ionisation flame sensor is not protected against contact but does
need to be protected against accidental contact.
Earth the burner as prescribed in the regulations – it is not enough to earth the boiler on
its own!
Position the ignition electrode and the ionisation flame sensor where the ignition spark
cannot arc over to the ionisation flame sensor (risk of electrical overloading)
Make sure that the functional earth ground (FPE) is connected properly. A missing or in-
correctly connected cable will not be able to protect the ionisation input in the event of a
malfunction or from external overvoltage and other EMC influences.
Depending on the flame sensor input, only one sensor each may be connected.
Please observe the requirements and specifications of the flame sensor manufacturer.
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