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4.7 AIR PRESSURE SWITCH
Adjust the air pressure switch after having performed all other burner adjustments starting with the air pres-
sure switch set to the start of the scale. With the burner operating at the required power, slowly turn knob
clockwise until burner locks out. Then turn the knob anti-clockwise by about 20% of the set point and sub-
sequently check to see if burner has started correctly. If the burner locks out again, turn the knob anti-
clockwise a little bit more, then obstruct the air intake and make sure the unit locks out.
NOTE: With the burner operating at minimum output, the pressure switch must be adjusted to 5 mbar and
you must obstruct the air intake and make sure the unit locks out.
Attention: As a rule, the air pressure switch must prevent the air pressure from lowering below 80 % of the
adjustment value as well as preventing CO from forming in the flue gases. Typical normal operating values
would be below 100 ppm. However to check the operation of the air pressure switch, the air intake can be
slowly blocked off until the burner locks out. The CO concentration in the flue gases must not exceed (1%)
10,000 ppm. To check this, insert a combustion analyser into the chimney, slowly close the fan suction inlet
(for example with cardboard) and check that the burner locks out, before the CO in the fumes exceeds 1 %.
4.8 BURNER START-UP CYCLE
Normal
Thermostat
Motor
Ignition transformer
Valve
Flame signal
Lock-out signal
Remote reset signal
Air pressure switch
2,5s
A
Lock-out is indicated by a lamp on the control box (5, fig. 1, page 1).
When the flame-failure occurs during working, shut down takes place within one second.
4.9 NORMAL OPERATING DIAGNOSTICS - FLAME DETECTION TIME
The control box has a further function by means of which it is possible to check the correct running of the burner
(signal: GREEN LED permanently lit up). In order to use this function, it is necessary to wait at least ten seconds
from the firing up of the burner and press the button of the control box for a minimum of three seconds.
Once the button has been released, the GREEN LED will start to flash, as illustrated in the diagram below.
GREEN LED on
wait at least 10s
The pulses of the LED constitute a signal spaced by approximately 3 seconds. The number of pulses will iden-
tify the SENSOR TIMING of the probe from opening of the gas valve, according to the table below.
SIGNAL
1
2
7
3217
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2s
400 ms
37s
3s
Press button
for > 3s
FLAME SENSOR
TIMING
ð 0.4s
ð 0.8s
ð 2.8s
Lock-out, due to light failure
2,5s
Interval
Signal
3s
Each time the burner is operated, this information is up-
dated. Once the reading has been taken, by pressing
the button on the control box briefly, the burner repeats
the start cycle.
WARNING
If a timing of > 2 seconds occurs, delayed start-up is
present. Check the setting of the hydraulic brake in the
gas valve and the setting of the air gate valve and the
combustion head.
11 GB
A
2s
400 ms
3s
D4245
36s
Signal
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