22
CONTROL UNIT OPERATION PROGRAM
The control unit is the most important element of control system. The control unit
allows the operation of the burner in accordance with control signals provided by the
control circuitry.
The LM0 44 is an electro-magnetic unit.
LM0 44 : CONTROL SEQUENCE, OPERATION AND TIMING
tw
Waiting time
5 sec.
t1
Prepurge time
25 sec.
t1
ı
Purge time
26 sec.
t3
Pre-ignition time
25 sec.
t3n
Post-ignition time
5 sec.
t4
Interval from flame signal
to release <<BV2>>
5 sec.
TSA Ignition safety time
5 sec.
TSA
t3n
t4
t1
t3
tw
A'
t1'
A
B
C
D
1
2
A
ı
Beginning of the start up sequence
with burners using an <<OH>>
A
Beginning of start up sequence with
burners using no <<OH>>
B
Time of flame establishment
C
Operating position
D
Controlled shutdown by <<R>>