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3.7.22 Long pre-purging
If the long pre-purging is enabled an initial pre-purging of 1 min
and 45 seconds beyond the default pre-purging time is carried
out (15 sec).
In recycles due to flame loss when operating, the long pre-purg-
ing is not carried out but only the pre-purging with the default time
(15 sec).
3.7.23 Post-purging
Post-purging is a function that allows you to maintain the air purg-
ing even after the burner is switched off in the absence of the heat
request for a pre-set time.
The burner switches off the flame when the heat request thermo-
stat opens, cutting off the fuel supply to the valves.
The post-purging function is not performed:
after a lockout of the motor or valves;
if the heat request is interrupted during pre-purging.
Post-purging occurs:
if the heat request is interrupted during the safety time.
if the heat request is interrupted during normal operation.
After a lockout due to a parasite flame in pre-purging.
After a lockout due to a lack of flame at the end of the Ts.
After a lockout due to the finishing of the number of recycles
due to flame loss.
After a short-circuit 1st stage valve lockout.
NOTE:
If during post-purging there is an extraneous light or a parasite
flame the burner goes into lockout after 25 seconds.
If during post-purging there is a new heat request, the post-purg-
ing time is halted, the fan motor stops and a new burner operating
cycle starts.
3.7.24 Continuous purging
Continuous purging is a function that maintains the air ventilation
independently of the request for burner ignition.
From the moment when it is set, the motor remains in operation
both when the limit thermostat (TL) is not switched over (burner
switched off), and when the burner is in lockout.
When the limit thermostat (TL) switches the motor stops for the
stand-by time of 2 seconds and a new burner operating cycle
starts.
If during continuous purging when there is no heat request a
parasite flame is detected, the motor stays on and a fault is
signalled. The burner reaches the lockout condition after 25
seconds.
If during continuous purging a parasite flame is detected, the
motor stays on but if a heat request occurs the motor is
switched off, the motor is not started after the standby (2sec)
if the parasite flame persists; the burner reaches the lockout
condition after 25 seconds. After the lockout has been reset
the motor is restarted.
The motor stays on even in a lockout.
The continuous purging is interrupted if an internal fault is
detected that brings the burner to the lockout condition
(eeprom, motor, 1st and 2nd stage valves).
3.7.25 Lockout log
The control box allows the logging of the type and number of lock-
outs that have occurred and keeps them even without the electri-
cal power supply. The logs of the lockouts allows you to access
the last 10 lockouts (see paragraph "Programming menu" on
page 15).
Electrical data and operating times
Once the programming menu page has been reached by press-
ing the reset button the last lockout is displayed, pressing 10
times displays the least recent lockout (each time the burner
reaches the lockout condition the oldest one is removed).
5 seconds after the last pressing of the buttons, the type of lock-
out is displayed, see paragraph "Fault diagnostics - lockouts"
on page 10).
3.7.26 Logging of burner operating parameters
The control box allows you to log the operating time of the open-
ing of the 1st stage valve.
In this way it is possible to establish how much fuel has been con-
sumed during the operation.
The frequency of the count is 1 second.
Saving to memory (eeprom) of the data occurs every 30 minutes
if the burner is on.
Saving to memory is carried out even if in the previous 30 min-
utes the control box was operating only for a short period of time.
If the control box is cut off from the mains power supply between
one saving and the next (after 30 minutes) the information about
this interval is lost.
If in the interval between one saving and the next a lockout is set,
there is writing to memory that involves also the logging of the op-
erating hours.
Together with the operating hours also the number of the burner's
1st stage valve openings is saved.
In the menu (see paragraph "The deactivation of the automatic
pre-heating is not lost if the switching off test is activated or
if the heat request thermostat opens." on page 14) it is possi-
ble to independently reset both the operating hours meter and the
meter for the number of openings of the 1st stage valve that oc-
curred.
The number of openings of the 1st stage valve is a maxi-
The meter for the number of openings of the first stage valve
To display these parameters it is necessary to connect the PC
DGT1000 diagnostic software kit.
13
GB
mum of: 16.777.215 (after which it is reset).
is a maximum: 65,535 days (after which it is reset).
20138365
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