Siemens LME7 Series - Function; 6.1 Preconditions for Burner Startup; 6.2 Undervoltage

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Building Technologies Basic Documentation LME7... CC1P7105enr
6 Function 17.04.2018
6 Function
6.1 Preconditions for burner startup
∂ Burner control must be reset
∂ All contacts in the line are closed, there is a request for heat
∂ No undervoltage
∂ Air pressure switch or POC must be in its no-load position, or Dbr1 is connected to
terminal X2-02 (depending on program sequence)
∂ Flame detector is darkened and there is no extraneous light
∂ All contacts in the safety loop are closed
6.2 Undervoltage
∂ Safety shutdown from the operating position takes place should mains voltage drop
below about AC 75 V (UN = AC 120 V)
∂ Restart is initiated when mains voltage exceeds about AC 100 V (UN = AC 120 V)
∂ Safety shutdown from the operating position takes place should mains voltage drop
below about AC 165 V (UN = AC 230 V)
∂ Restart is initiated when mains voltage exceeds about AC 195 V (UN = AC 230 V)
6.3 Controlled intermittent operation
Depending on program module, see User Documentations.
After no more than 24 hours of continuous operation, the burner control initiates automatic
controlled shutdown followed by a restart, against parameter 239.