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Building Technologies Basic Documentation LMV5... CC1P7550en
4 Burner control 22.05.2018
4.1.5 Digital inputs
4.1.5.1 Safety loop / burner flange (X3-04 pin 1 / X3-03 pin 1)
Β
Note!
All digital inputs are safety-related inputs. Using a contact feedback network (CFN),
these contacts are read back by the microcomputers and checked for their correct
positions.
This input serves for including the safety loop. The special feature of this input is that all
signal source contacts connected in series here directly switch off the power supply to the
fuel valves and ignition.
Typically, the following contacts are included in the safety loop:
∂ External burner switch ON/OFF
∂ Safety limit thermostat / safety pressure limiter (SLT / SPL)
∂ External temperature limiter / pressure switch, if required
∂ Water shortage switch
Caution!
Temporarily switching contacts (<1 s, push-buttons or similar) must not be
included in the safety loop!
∂ End switch burner flange (component of safety loop)
For diagnostics, the signal source contacts are combined for delivering the Safety loop
message. If no signal is received, the burner will at least be shut down. What follows is
a number of repetitions that can be parameterized.
Parameter SafetyLoop
FLANGE
X3-03 pin 1
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