3425
9
GB
4.6
OPERATING PROGRAMME
4.6.1
NORMAL OPERATION
t
3
i
t
3
t
4i
t
s
t
4L
TL
M
I
V
SO
LED
LED
P
M
.
SO
t
1
+t
2
D8476
Red
MV = idle
Lockout
Flame loss during operation (Recycle max 3 attempts)
Green
KEY TO LAYOUT
I
– Igniter
LED
– Reset button LED indicating
operating status
M
– Fan motor
SO
– Ionisation probe
TL
– Limit thermostat
V
– Gas valve
t1
Standby time pending an input signal to control box:
reaction time, the control box stands still for the time
t1
.
t3r
A recycle is carried out if the motor rotation drops below
520rpm during pre-purging and pre-ignition: after 3 recy-
cle attempts, there is a lockout
t1I
Flame or flame simulation detected before demand for
heat: if the presence of light lasts for the
t1l
time, a block
follows.
ts
Safety time:
if, at the end of the time
ts
there is no flame, the start-up
cycle is repeated. After 3 firing attempts, there is lock-
out.
t2
Wait time after a request for heat:
the control box remains idle for the
t2
time.
t4i
Post-ignition time of the igniter: the igniter works during
the safety time.
t2a
Check whether the motor rotation is already present at
the moment of request for heat: the control box remains
in standby status, then there is a lockout if the number of
rotations is greater than, or equal to, 520rpm.
t4a
Time for checking rotation during the safety time ts, or in
normal operation: if the number of rotations drops below
520rpm, the control box goes immediately into lockout.
t4I
Flame loss in operation: valve drop maximum reaction
time, lockout occurs after 3 recycle attempts.
t2I
Flame or flame simulation detected before during
standby time: lockout occurs if flame or flame simula-
tion persists for time
t2l
.
t3
Pre-purging time: start of the fan motor.
t6
Post-purging time: additional purging time on the open-
ing of the heat limit thermostat (
TL
).
t3a
Time for checking the motor rotation during pre-purging:
if the number of rotations is less than 520rpm, after t3a
there will be a lockout
t6I
Flame or flame simulation detected during post-purging:
lockout occurs if flame or flame simulation persists for
time
t6l
.
t3I
Flame or flame simulation detected during pre-purging
and pre-ignition: immediate lockout.
rpm = rotations per minute
t3i
Pre-ignition time of the igniter.
OPERATING TIMES (expressed in seconds)
t1
t1I
t2
t2a
t2l
t3
t3a
t3l
t3i
ts
t4i
t4a
t4l
t6
t6l
max
-
-
-
-
-
-
max
-
-
-
max
max
max
-
1
30
3
120
30
5
15
1
20
3
3
1
1
360
30
Red (LED lights)
Green (LED lights)
No signal needs to
be received
