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Building Technologies Division Basic Documentation LME39… CC1P7106en
7 Functions 08.12.2017
7.4 Control sequence in the event of fault
If lockout occurs, the outputs for the fuel valves, the burner motor and the ignition
equipment immediately deactivated (<1 second).
Cause Response
Mains failure Safety shutdown, followed by restart on restoration of mains
voltage
Voltage below undervoltage threshold Safety shutdown
Voltage above undervoltage threshold Restart
Extraneous light during prepurge time Lockout, blink code 4
Extraneous light during waiting time Prevention of startup, lockout after approx. 30 seconds at
the
latest, blink code 4
No flame at the end of safety time
Factory setting:
Lockout at the end of safety time, blink code 2
Can be parameterized:
Max. 3 repetitions, followed by lockout at the end of safety
time, blink code 2
Loss of flame during operation
Factory setting:
Lockout, blink code 7
Can be parameterized:
Max. 3 repetitions, followed by lockout, blink code 7
Air pressure switch welded in working position Prevention of startup, lockout after approx. 65 seconds at
the latest, blink code 5
Air pressure switch welded in no-load position
- Failure during valve proving
(only in connection with LDU11...)
Lockout approx. 180 seconds at the end of specified time
blink code 3
Note!
Time may be extended by the actuator’s running ti
(t11), depending on the application.
No air pressure signal after completion specified time Lockout, blink code 3
CPI contact is open during waiting time Prevention of startup, lockout after approx. 60 seconds at
the
latest, blink code 14
Table 5: Lockout
In the event of lockout, the LME39… remains locked and the red fault signal lamp lights
up. The burner control can immediately be reset. This state is also maintained in the
event of mains failure.
7.5 Resetting the burner control
When lockout occurs, the burner control can immediately be reset. Keep the lockout
reset button depressed for about 1 second (<3 seconds). The LME39… can only be
reset when all contacts in the line are closed and when there is no undervoltage.
The burner control can also be reset via display and operation unit AZL2... or PC
software ACS410.
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