Functions; Preconditions For Burner Startup; Undervoltage; Controlled Intermittent Operation - Siemens LME39 Series Basic Documentation

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Building Technologies Division
7

Functions

7.1 Preconditions for burner startup


Burner control must be reset

All contacts in the line are closed, request for heat

No undervoltage

Air pressure switch or CPI must be in its no-load position, or DBR2 is connected

Fuel valve 1 is connected

Fan motor or AGK25 is connected

Flame detector is darkened and there is no extraneous light

7.2 Undervoltage


Safety shutdown from the operating position takes place should mains voltage drop
below about AC 75 V (at UN = AC 120 V)

Restart is initiated when mains voltage exceeds about AC 95 V (at UN = AC 120 V)

Safety shutdown from the operating position takes place should mains voltage drop
below about AC 165 V (at UN = AC 230 V)

Restart is initiated when mains voltage exceeds about AC 175 V
(at UN = AC 230 V)

7.3 Controlled intermittent operation

After no more than 24 hours of continuous operation, the burner control initiates
automatic controlled shutdown followed by a restart.
Basic Documentation LME39...
7 Functions
CC1P7106en
08.12.2017