8/13
Building Technologies Division
CC1N7130en
Infrastructure & Cities Sector
22.08.2013
Function
x
Burner control is reset
x
Reset button
«EK1»
or
«EK2»
not used
x
All contacts in the line are closed and there is demand for heat
x
No undervoltage
x
Flame detector is darkened and there is no extraneous light
x
Safety shutdown from the operating position takes place should mains voltage drop
below about AC 165 V (U
N
= AC 230 V) or AC 75 V (U
N
= AC 120 V)
x
Restart is initiated when mains voltage exceeds about AC 175 V (U
N
= AC 230 V)
or AC 95 V (U
N
= AC 120 V)
If the oil preheater’s release contact does not close within 10 minutes, the burner control
will initiate lockout.
After no more than 24 hours of continuous operation, the burner control will initiate
automatic controlled shutdown followed by a restart.
If lockout occurs, the outputs for the fuel valves, the burner motor and the ignition
equipment will immediately be deactivated (<1 second). In the event of lockout, the
LMO... remains locked and the red signal lamp (LED) will light up. The burner control can
immediately be reset. This state is also maintained in the case of mains failure.
Cause
Response
Mains failure
Restart
Voltage has fallen below the undervoltage
threshold
Safety shutdown, followed by restart
Extraneous light during prepurge time (t1), 5
s before fuel valve (BV1) release
Lockout at the end of prepurge time (t1)
Extraneous light during waiting time (tw)
Prevention of startup, lockout after 40
seconds at the latest
No flame at the end of safety time (TSA)
Lockout at the end of safety time (TSA), blink
code 2
Loss of flame during operation
Max. 3 repetitions, followed by lockout
Oil preheater’s release contact does not
close within 10 minutes
Lockout
When lockout occurs, the burner control can immediately be reset. To do this, press the
lockout reset button for about 1 second (<3 seconds). The LMO... can only be reset when
all contacts in the line are closed and when there is no undervoltage.
If the flame is lost during
safety time (
TSA), the burner will be reignited, but only until the
end of
safety time
(TSA). This means that several ignition attempts can be made during
safety time
(TSA) (see
Control sequence
).
If the flame is lost during operation, a maximum of 3 repetitions can be made. If the
flame is lost for the fourth time during operation, the burner will initiate lockout. The
repetition count is restarted each time controlled switching on by control thermostat or
pressurestat (R) takes place.
Preconditions for
startup
Undervoltage
Time supervision
oil preheater
Controlled intermittent
operation
Control sequence in
the event of fault
Resetting the
burner control
Ignition program with
LMO14.11
3
x2 and
LMO24.11
3
x2
Limitation of repetitions
