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7.2.5
Measuring the ionisation current
The burner is fitted with an ionisation system to check that a
flame is present.
The minimum current for control box operation is 4 µA. The oper-
ator panel displays "30%" (see "List of parameters" on page 46,
parameter no. 954).
The burner provides a much higher current, so controls are not
normally required.
However, if it is necessary to measure the ionisation current, dis-
connect the plug-socket on the ionisation probe cable and insert
a direct current microammeter with a base scale of 100 µA, as
shown in Fig. 36.
Carefully check the polarities!
WARNING
20076585
7.3
Checking the position of the rpm sensor
To calibrate the rpm sensor, proceed as follows:
loosen the screws 3) rest the sensor on the disc extension 2).
Take the scale 4) as a reference, pull back the rpm sensor by
about a notch so that the distance from the disc extension 2) is
about 2 mm.
Key (Fig. 38)
1 - Rpm sensor
2 - Disc
3 - Screw
4 - Scale
20081760
Maintenance
7.2.6
Checking the air and gas pressure on the
combustion head
To carry out this operation it is necessary to use a pressure gauge
to measure the air and gas pressure at the combustion head, as
shown in Fig. 37.
Checking
air pressure
20076586
Fig. 36
4
20082216
54
GB
Checking
gas pressure
3
1
3
Fig. 37
2
Fig. 38
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