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6.7.23 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
delay 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 stage valve).
6.7.24 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 32).
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 27).
6.7.25 Logging of burner operating parameters
The control box allows you to log the operating time of the
opening of the 1st stage valve.
That way, you can determine how much fuel has been
consumed during 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
minutes 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 operating hours.
Together with the operating hours also the number of the
burner's 1st stage valve openings is saved.
In the menu (see paragraph "Programming menu" on
page 32) it is possible to independently reset both the operating
hours meter and the meter for the number of openings of the 1st
stage valve that occurred.
The number of openings of the 1st stage valve is a maxi-
mum of: 16.777.215 (after which it is reset).
The meter for the number of openings of the first stage valve
20138077
Start-up, calibration and operation of the burner
is a maximum: 65,535 days (after which it is reset).
To display these parameters it is necessary to connect the PC
DGT1000 diagnostic software kit.
6.7.26 Admissible lengths of the external
connections to the burner
Outlet cables of the burner
Mains electric power supply
Heat request thermostat
Hour counter
External lockout indicator
Remote reset
In the event of burner applications with remote
control commands greater than those indicated in
Tab. M, insert the relay command devices
(230Vac) with contacts placed near or not more
WARNING
than the maximum indicated lengths.
6.7.27 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).
30
GB
Maximum
length
Identification
permitted
(metres)
L1 (L), N
20
TL (T1,T2)
20
B4
3
S3
20
R (RS)
20
Tab. M
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