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Building Technologies CC1N7130en
15.03.2018
Electrical connection of the flame detectors
It is important to achieve practically disturbance- and loss-free signal transmission:
∂ Never run the detector cable together with other cables
– Line capacitance reduces the magnitude of the flame signal
– Use a separate cable
∂ Observe the maximum permissible lengths of the detector cables (refer to
«Technical data»)
∂ Earth the burner in compliance with the relevant regulations; earthing the boiler
alone does not suffice
Commissioning notes
When commissioning the plant or when doing maintenance work, make the following
safety checks:
Safety check Anticipated response
a) Burner startup with flame detector darkened Non-alterable lockout at the end
of the safety time (TSA)
b) Burner startup with flame detector exposed
to extraneous light
Non-alterable lockout within 40
seconds
c) Burner operation with simulated loss of
flame; for that purpose, darken the flame
detector during operation and maintain that
state
Repetition followed by the non-
alterable lockout at the end of
safety time (TSA)
Installation notes
∂ Always run the high-voltage ignition cables separately while observing the greatest
possible distances to the unit and to other cables
∂ Install switches, fuses, earthing, etc., in compliance with local regulations
∂ Ensure that the maximum permissible amperages will not be exceeded (refer to
«Technical data»)
∂ Do not feed external mains voltage to the control outputs of the unit. When testing
the components controlled by the burner control (fuel valves, etc.), the LMO may
never be plugged in
∂ Do not mix up live and neutral conductors
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