Siemens LMO14 Series Manual page 8

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
LMO14.113B2 and
LMO24.113B2
Limitation of repetitions
8/12
Siemens Building Technologies
HVAC Products
·
Burner control is reset
·
All contacts in the line are closed and there is demand for heat
·
No undervoltage
·
Flame detector is darkened and there is no extraneous light
·
Safety shutdown in the operating position takes place should mains voltage drop
below about AC 165 V (U
·
Restart is initiated when mains voltage exceeds about AC 175 V (U
If the oil preheater's release contact does not close within 10 minutes, the burner control
will initiate lockout.
After 24 hours of continuous operation at the latest, the burner control will initiate auto-
matic controlled shutdown followed by a restart.
If lockout occurs, the outputs for the fuel valves, burner motor and ignition equipment
will immediately be deactivated (< 1 second).
Cause
Mains failure
Voltage has fallen below the undervoltage
threshold
Extraneous light during «t1»
Extraneous light during «tw»
No flame at the end of «TSA»
Loss of flame during operation
Oil preheater's release contact does not
close within 10 minutes
In the event of lockout, the LMO... remains locked and the red signal lampLED will light
up. The burner control can immediately be reset.
This state is also maintained in the case of mains failure.
Whenever lockout occurs, the burner control can immediately be reset. To do this, press
the lockout reset button for about 1 second (< 3 seconds).
If the flame is lost during «TSA», the burner will be reignited, but only until the end of
«TSAmax».
This means that several ignition attempts can be made during «TSA» (refer to «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 «R-W-SB» takes
place.
= AC 230 V)
N
Response
Restart
Restart
Lockout at the end of «t1»
Prevention of startup, lockout after 40 sec-
onds at the latest
Lockout at the end of «TSA»
Max. 3 repetitions, followed by lockout
Lockout
= AC 230 V)
N
CC1N7130en
15.10.2002