Riello 40 FS8 Instrucciones De Instalación, Uso Y Mantenimiento página 29

CONTINUOUS PURGING FUNCTION,
Continuous purging is an operation that maintains the air purging regardless of whether there is a request for burner
ignition or not. From the moment it is set, the motor keeps running whether the limit thermostat (TL) has not been
switched (burner off), or when the burner is locked out.
When the limit thermostat (TL) is switched the motor is stopped for the standby time of four seconds (standby
position = t2 + t1), the subsequent check of the air pressure switch and beginning of a new burner operation cy-
cle.
The function can be set from the reset button when the limit thermostat (TL) is not switched (burner off), by
following the procedure in the post-purging function paragraph pressing the button 7 times = continuous
purging.
To reset this function, press and hold the button for at least 5 seconds at least, 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 again.
The control box's factory settings are as follows: 0 minutes = no continuous post-purging.
FUNCTION SETTING PROCEDURE USING RESET BUTTON
Control box
function
Reset
Visual diagnostic of the causes of the
lockout
Post-purging
Continuous purging (only for required
applications)
Resetting set functions
Resetting operating parameters
MAINTENANCE
Before cleaning or performing checks, switch off the burner's power supply with the system's main
switch and close the gas shutoff valve.
The burner requires periodic maintenance carried out by a qualified and authorised technician in conformity
with legislation and local standards.
Periodic maintenance is essential for the reliability of the burner, avoiding the excessive consumption of fuel
and consequent pollution.
THE BASIC OPERATIONS ARE:
 Checking that there are no obstructions or kinks in the supply or return oil pipes, in the air intake regions
and the combustion product discharge tubes.
 Checking that the burner and gas train electrical connections are correct.
 Checking that the gas train is suitable for the burner's power, the type of gas used and the mains gas
pressure.
 Checking the proper positioning of the combustion head and its fixing to the boiler.
 Checking the proper positioning of the air damper.
 Checking the proper positioning of the ionisation probe and electrode.
 Checking the adjustment of the air pressure switch and the gas pressure switch.
Let the burner work at full speed for approximately ten minutes, correctly adjusting all the elements indicated
in this manual. Then carry out the analysis of the combustion by checking:
Percentage of CO (%);
2
Ionisation current (μA);
3389
(only for applications in which this is provided for)
Actions on the reset
button
1 - 2 seconds
3 seconds
5 seconds then press
once = 1 minute
5 seconds then press
7 times = continuous purging
5 seconds
5 seconds
CO Content (ppm);
Flue gases temperature at the flue.
11 GB
Possible Reset button
use 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)
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)
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) switched
during pre-purging
NOx content (ppm);