Air Pressure Switch; Burner Start-Up Cycle - Riello RDBS0.1 Manuel D'entretien

4.7 AIR PRESSURE SWITCH

Adjust the air pressure switch after having performed all other burner adjustments starting with the air pressure
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 subsequently 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 ad-
justment 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 exam-
ple 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
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.
2925
2,5s 2s
37s 3s
Lock-out, due to light failure
400 ms 2,5s
11 GB
A
2s 400 ms
3s
D4245
36s