3342
10
GB
4.5.2 LOCKOUT DUE TO FIRING FAILURE
LOCKOUT TYPES AND TRIGGERING TIMES IN CASE OF BURNER MALFUNCTION
DESCRIPTION OF FAULT TYPES
LOCKOUT
Flame detected when burner is started or
switches off
After max. 30 seconds (after
TL
)
Flame detected during pre-purging
Within 1 second
Flame detected during post-purging
After max. 30 seconds
Ignition failure at the end of the safety time ≈ts∆
After max. 3 repeated attempts, within 1 second
Flame loss during operation
After max. 3 repeated attempts, within 1 second
Incorrect fan motor speed (rpm)
Within ≈t3a∆ and/or ≈t3b∆
4.5.3 LOCKOUT DUE TO DETECTION OF FLAME
OR FLAME SIMULATION DURING PRE-
PURGING
D7253
Red
Red
Lockout
D7254
KEY
I
- Ignition transformer
LED
√ Reset button LED indicating operating
status
M
√ Fan motor
SO
√ Ionization probe
TL
√ Limit thermostat
V
√ Gas valve
Red (LED lights)
Green (LED lights)
Purging motor at max. rpm
Purging motor at START rpm (t3b)
Green
Green
OPERATING TIMES
Time expressed in seconds
t1
t1I
t2
t2l
t3
t3a
t3b
t3l
ts
t4i
t4l
t6
t6l
max.
max.
-
max.
-
-
-
max.
-
-
max.
max.
max.
1
30
3
30
40
8
5
1
3
3
1
360
30
Lockout at 4
th
restart
Red (LED lights)
Green (LED lights)
Purging motor at max. rpm
