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6.5
Operation sequence of the burner
6.5.1
Regular operation
P
TL
t
2
t
1
M
M
I
V
SO
LED
Flame loss during operation (Recycle max. 3 attempts)
MV = idle
SO
LED
Operating times (in seconds)
t1, t3l, t4l, t4a
max
1
t1
Standby time pending an input signal to control box: re-
action time, the control box remains idle for the time t1.
t1I
Flame or flame simulation detected before demand for
heat: the control box remains idle.
t2
Standby time after a heat request: the control box re-
mains idle for the t2 time.
t2a
Check whether the air pressure switch has already been
moved to the work position before the required heat: the
control box remains in standby status, a lockout follows
if the air pressure switch remains switched for the T2a
time.
t2I
Flame or flame simulation detected before during stand-
by time: lockout occurs if flame or flame simulation per-
sists for time t2l.
t3
Pre-purge time: start of the fan motor.
t3a
Time for checking the switching of the air pressure
switch in the operating position during the pre-purging
time: if the pressure switch does not switch within t3a a
lockout follows.
t3I
Flame or flame simulation detected during pre-purging:
immediate lockout.
Start-up, calibration and operation of the burner
t
3
t
4i
t
s
Green
Green
t2l
t2, t4i
max
-
30
3
Key (Fig. 19)
I
LED
M
SO
TL
V
t
4L
.
Lockout
D7393
t2a
t3
-
-
max
120
40
t3r
A recycle attempt is made if there is a pressure drop dur-
ing the pre-purging stage:
there is then a lockout in the event of a second loss of
air pressure between the 16th second and the 29th; is a
loss of pressure between the 30th second and the 40th,
the device goes immediately into lockout mode.
ts
Safety time: if at the end of the ts time there is no flame,
a lockout follows.
t4a
Air pressure drop checking time during the ts time and
the normal operation:
the control box locks out immediately.
t4i
Transformer ignition time: total ignition time.
t4l
Loss of flame during operation: maximum reaction time
for dropped valve - after 3 recycle attempts there is a
lockout.
t6
Post-purge time: additional purging time on the opening
of the heat limit thermostat (TL).
21
GB
Ignition transformer
Reset button LED indicating operating status
Fan motor
Ionisation probe
Limit thermostat
Gas valve
Red (LED signalling)
Green (LED signalling)
No signal needs to be received
t3a
t3r
max
15
70
Fig. 19
ts
t6
-
max
3
360
Tab. H
Tab. I
20063692
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