78
GB
Flame detection
- Flame detection takes place via photoresistance with the following features:
Lighting levels:
Lux
Volt
DCFlame detection threshold:
>3.5
<1,5
Flame switch-off threshold:
<2.5
>1,8
Parasite flame threshold:
>1.5
<2,3
Maximum length of flame detection cable: 1.5 m
Repetition of the cycle in case the flame switches off in normal working position:
If the flame goes out in normal working position, the appliance repeats the start-up cycle (max 3 cycle repetitions);
the fourth consecutive time the flame goes out in normal working position causes a block shutdown.
Every 510 seconds an additional flame is allowed to go out, always up to a maximum of 4 consecutive.
Start-up prevented in presence of parasite flame:
If the system detects the presence of a parasite flame signal it signals the anomaly and if this anomaly lasts for
more than 10s the block shutdown occurs.
No flame signal detection at the end of the safety time:
If the appliance does not detect flame signals at the end of the safety time, a block shutdown is carried out.
Monitoring of functioning
The board provides the continuous monitoring of the functioning status of the motor and solenoid valves.
MOTOR
If there is no monitor signal or incorrect signal presence, at least 3 attempts are made to perform the start-up
cycle. If this anomaly persists, the board will carry out a block shutdown (burner control anomaly).
SOLENOID VALVES
If there is no monitor signal, at least 3 attempts are made to perform the start-up cycle. If this anomaly persists,
the board will carry out a block shutdown (burner control anomaly).If there is an incorrect monitor signal, the board
performs an immediate block shutdown (burner control anomaly).
Block shutdown and rearm
The button allows the reset of the appliance if it is in the block state.The appliance is released when the button
is pressed and then released (button on board or external release button).The appliance can be released by the
button on the board of the external release button.
For the appliance to be released, the button must be pressed for a period of time exceeding 0.2s but less than 4s.
In the case of block shutdown with manual rearm, 5 consecutive rearm operations are possible.
After which rearm is possible again:
- after 1 h ( n° 1 additional rearm is allowed every hour).
- removing the mains power supply.
The rearm operation is only possible if the appliance is supplied with mains voltage.Intermittent service
The board performs a regulation shutdown with self-diagnosis at least every minimum 18h - maximum 24h.
Summary of Contents for LMB LO 300 2ST
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