Siemens LMO14 Series Installation Instructions Manual page 14

Function
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
LMO14.113x2 and
LMO24.113x2
Limitation of repetitions
12/18
Building Technologies
∂
Burner control is reset
∂
Reset button
«EK1»
∂
All contacts in the line are closed, heat demand
∂
No undervoltage
∂
Flame detector is darkened and there is no extraneous light
∂
Safety shutdown from the operating position takes place should mains voltage drop
below about AC 165 V (with U
∂
Restart is initiated when mains voltage exceeds about AC 175 V (with U
V) or AC 95 V (with U
'
If the oil preheater s release contact does not close within 10 minutes, a non-alterable
lockout takes place.
After no more than 24 hours of continuous operation, the burner control will initiate
automatic controlled shutdown followed by a restart.
If a non-alterable lockout occurs, the outputs for the fuel valves, the burner motor and the
ignition equipment are always immediately deactivated (<1 second).
In the event of a non-alterable lockout, the LMO remains locked and the red signal lamp
(LED) lights up permanently.
The burner control can immediately be reset.
This state is also maintained in the case of mains failure.
Cause
Mains failure
Voltage below undervoltage threshold
Extraneous light during prepurge time (t1), 5
s before fuel valve (BV1) release
Extraneous light during waiting time (tw)
No flame at the end of safety time (TSA)
Loss of flame during operation
Oil preheater's release contact does not
close within 10 minutes
After a non-alterable lockout, a reset can be carried out immediately. Press and hold the
lockout reset button for about 1 second (<3 seconds). The LMO can be reset only when
all contacts in the line are closed and there is no undervoltage.
If the flame is lost during the safety time (TSA), the burner will be reignited before the
end of the safety time (TSA).
This means that several ignition attempts can be made during
Control sequence).
If the flame is lost during operation, a maximum of 3 repetitions can be carried out. If
the flame is lost for the fourth time during operation, the burner will initiate a non-
alterable lockout.
The repetition count is restarted each time controlled switching on by control thermostat
or pressurestat (R) takes place.
or not used
«EK2»
= AC 230 V) or AC 75 V (with U
N
= AC 120 V)
N
Response
Restart
Safety shutdown, followed by restart
Non-alterable lockout at the end of the
prepurge time (t1)
Start prevention, a non-alterable lockout
occurs after a maximum of 40 seconds
Non-alterable lockout at the end of the
safety time (TSA), blink code 2, see
Control sequence
Maximum of 3 repetitions, then a non-
alterable lockout occurs
Non-alterable lockout
= AC 120 V)
N
= AC 230
N
safety time (TSA) (see
CC1N7130en
15.03.2018