Additional Programmable Control Box Functions; Post-Purging Function; Continuous Purging Function; Long Pre-Purging Function - Riello BG5 Instrucciones De Instalación, Uso Y Mantenimiento

4.7

ADDITIONAL PROGRAMMABLE CONTROL BOX FUNCTIONS

4.7.1 POST-PURGING FUNCTION (t6)
Post-ventilation is a function that maintains air ventilation even after the burner is switched off. The burner
switches off when the limit thermostat (TL) opens, cutting off the fuel supply to the valves.
To use this function the reset button must be pressed when the limit thermostat (TL) is not switched over
(burner switched off). Post-ventilation time can be set to a maximum of 6 minutes. Proceed as follows:
Press and hold the reset button for at least 5 seconds till the LED indicator changes to red.
Set the desired time pressing the button repeatedly: once = post-ventilation for 1 minute.
After 5 seconds the control box automatically shows the minutes set by the red LED flashing:
1 pulse = post-ventilation for 1 minute.
To reset this function, press and hold the button for at least 5 seconds, till the LED indicator changes to red then
release it without carrying out any operation, then wait for 20 seconds for the burner to start.
If during post-purging there is a new request for heat, post-purging time is halted and a new operating cycle
starts when the limit thermostat (TL) switches over.
If there is extraneous light during post-purging, the burner locks out after 30 seconds.
The control box leaves the factory with the following setting: 0 pulses = no post-purging.
4.7.2 CONTINUOUS PURGING FUNCTION, (only for applications where this is an option)
Continuous purging is a function that keeps air purging on regardless of whether burner ignition is being
requested. As soon as this mode is set, the motor keeps running both when the limit thermostat (TL) is not
switched (burner off) and when the burner is locked out.
Only when the limit thermostat (TL) switches will the motor stop for the standby time of 4 seconds (standby posi-
tion = t2 + t1).
The function can be set with the reset button, when the limit thermostat (TL) is not switched (burner off),
following the procedure in section 4.7.1 post-purging function, by pressing the button 7 times = continu-
ous purging active. To reset this function, simply hold the button down for 5 seconds until the indicator
LED goes red and release it without performing any operation, then wait at least 20 seconds to allow the
burner to restart. If there is extraneous light when the limit thermostat (TL) switches, the motor stops for as
long as the extraneous light persists, after which there is a lockout.
The control box's factory setting is as follows: 0 pulses = no continuous purging.
4.7.3 LONG PRE-PURGING FUNCTION (t7)
Long pre-purging is a feature that can be used to lengthen the air purging period to 2 minutes from when the
limit thermostat (TL) switches to when the flame ignites. The function can be set with the reset button, when the
limit thermostat (TL) is not switched (burner off), following the procedure in section 4.7.1 post-purging function,
by pressing the button 8 times = long pre-purging active.
To reset this function, simply hold the button down for 5 seconds until the indicator LED goes red and release it
without performing any operation, then wait at least 20 seconds to allow the burner to restart.
The control box's factory setting is as follows: 0 pulses = no long pre-purging.

4.7.4 FUNCTION SETTING PROCEDURE USING RESET BUTTON

Control box
function
Reset
Visual diagnostics of lockout causes
(5.1)
Post-purging (4.7.1)
Continuous purging (4.7.2)
(only for applications where this is an
option)
Long pre-purging (4.7.3)
Resetting set functions
Resetting operation parameters
3402
Action with
reset button
1 to 2 seconds
3 seconds
5 seconds then
press once = 1 minute
5 seconds then
press 7 times = continuous purging
5 seconds then
press 8 times = long pre-purging
5 seconds
5 seconds
14 GB
Reset button
in enabled status
After control box lockout
After control box lockout
W i t h l i m i t t h e r m o s t a t ( T L ) n o t
switched (burner off)
With limit thermostat (TL) not
switched (burner off)
With limit thermostat (TL) not
switched (burner off)
With limit thermostat (TL) not
switched (burner off)
With limit thermostat (TL) switched
during pre-purging