22
In order to obtain the best combustion performance and efficiency, and for respect of the environment, checks
and adjustment of the combustion must be carried out, and with appropriate tools.
Basic values to be considered are:
— CO
2
indicates the amount of excess air during combustion; if air is increased, CO
2
% values
decrease, and if combustion air is decreased, CO
2
% values increase.
— SMOKE SCALE (Bacharach) indicates that solid un-burnt particles are present in the smoke. If N°
2 on the BH scale is exceeded the nozzle must be checked for faults and that it is adapt to the burner
and boiler (trade, type, pulverization angle).
Usually the BH scale number tends to decrease, increasing pump pressure, in this case keep the
increasing combustion levels under control.
— SMOKE TEMPERATURE is a level which indicates heat loss through the chimney; higher the
temperature, greater is the loss and lower combustion efficiency. If the temperature is too high the
quantity of burned light oil needs to be lowered.
IMPORTANT
Existing laws in some countries can require a different adjustment to that given here and may also have
different parameters. AZ burners are designed to meet the toughest international laws on energy saving and
respect of the environment.
COMBUSTION CONTROL
LMO EQUIPMENT
The release pushbutton on the equipment is the main component for accessing all the diagnostic func-
tions (activation and deactivation) as well as for releasing the control and checking device.
The release pushbutton has a multicoloured led which indicates the state of the control and checking
device during operation and when the diagnostic function is in use.
EQUIPMENT STATE INDICATORS
Description
Condition
Colour sequence
Standby, other intermediate states
No light
Fuel preheating “on”, waiting time 5s.max
Yellow
Ignition stage
Yellow, flashing
Correct operation
Green
Incorrect operation, current level of
flame detector below permitted minimum
Green, flashing
Drop in voltage
Alternating yellow red
Burner lock out
Red
Fault (see table on page 8)
Red, flashing
Stray light before burner ignition
Alternating green red
Rapid flashing for diagnostics
Red, rapid flashing
If the burner is locked out, there will be a steady red light on the lock out pushbutton.
By pressing the transparent pushbutton, the control and checking device will be released.
By pressing it for more than 3 seconds, the diagnosis stage will be activated (red light flashes rapidly).
The table below describes the causes of the lock out or fault in relation to the number of flashes (always red).
The diagnosis function is interrupted by pressing the release button for at least 3 seconds.
