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Building Technologies Basic Documentation LMV5... CC1P7550en
4 Burner control 22.05.2018
4.1.3 External flame supervision (LMV50 / LMV52)
Flame supervision can be performed by means of an external, approved (failsafe / self-
checking) flame safeguard.
The external flame safeguard must issue the flame signal (mains voltage ON/OFF) via
a switching contact.
The flame signal is evaluated at LMV5 input X6-01 pin 3 (HeavyOilDirStart ). To do this,
the input must be configured to ext.FlameGd.
A mains voltage signal at the input results in a flame signal.
The entire system is then only suitable for continuous operation if the external flame
safeguard being used has been approved for continuous operation.
Parameter HeavyOilDirStart (ext.FlameGd) (deactivated / activated)
If necessary, a second switching contact (redundancy contact) can also be used for the
external flame safeguard.
This must always be inverse to the first switching contact:
- Mains voltage present = no flame
- Mains voltage not present = flame
This contact can be connected to input X6-01 pin 1 (start release oil) if the input has
been parameterized to HT/FG-RedCo.
Parameter StartReleaseOil (HT/FG-RedCo) (deactivated / activated)
Setting and determination of safety time during operation is defined in the section
Reaction time for loss of flame / safety time in operation.
Attention!
∂ Please be aware that the reaction time of the external flame safeguard and
that of the LMV5 must be added together. The reaction time of the LMV5 is
minimum 1.2 seconds.
A extinction safety time during operation in accordance with EN 676 of a
maximum of 1 second is therefore not possible with an external flame
safeguard
∂ When using an external flame safeguard, no flame detector must be
connected to X10
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