Rational SCC Series

115
Gas
Edition 10-2008a
Sequence of events of Steam / Hot Air Burner (SCC as well as CM)
If no flame detected => new ignition sequence. After 5
th
ignition without success => RESET
16 2419 2017 1810 11 14 15
Speed of burner blower motor in U/min
21 22 23 26 27678901 45
8 4 3 2 1
2512 13
F l a m e c u r r e n t in μA
Time 2 3
7 6 5
Flame monitoring
Energise Solenoids: Black coils ca 205V DC / orange coils ca 108V DC
Ignition box gets heat demand over the BUS cable
Ignition, ca 20KV
Burner blower motor
Gas valve
Heat demand
Start - pre purge
about. 4-5 sec
Pre purge, 4 sec
RPM monitored
Blower runs with Start RPM
RPM monitoring by ignition box
Blower runs with Max or Min RPM
RPM monitoring by ignition box
Flame monitoring within. 2 sec
C
continuous flame control
Start RPM
Max RPM
Min RPM
sec
RPM
I
gn
i
t
i
on,
5
secPre ignition, 1sec
Start up Pre purge
Pre ignition
Ignition Burner running
Flame
control
μA
Flame current
Sequence of events of Burner and Ignition control