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10.9 Flame monitoring and ionisation current
check (Continuous operation)
The standard version of the burner is monitored according to the ionisation
principle. The ionisation current should be checked on initial start-up and at
each service visit.
The cause of low ionisation current can be leakage current, poor connection
to earth, fouling, or the angle of the ionisation electrode may need to
be adjusted. Occasionally, an incorrect gas/air mix may result in poor
ionisation current. Ionisation current is measured using a micro ammeter
(µA) connected in series with the ionisation electrode and gas burner
control. Connect the µ ammeter according to the diagram. The minimum
required ionisation current is shown in the table. In practice, this current
must be significantly higher, preferably more than 10 µA. Connection of the
µA instrument is made easier by the fact that all gas burners are equipped
with a divisible ionisation cable.
Technical data
For continuous operation!
Idle voltage at ION-terminals
!
Protect the ionisation electrode from
electric shock!
Short-circuit current
Min. current for flame
detection
Required current to ensure
detection
Possible detection current
10.10 UV-5 (only intermittent operation)
This should not be exposed to temperatures higher than 60°C. The signal
running through the UV probe when it is illuminated cannot be measured.
To check the flame, perform the following:
The LEDs can show the flame strength in Control mode by pressing the
reset button for 3 seconds when the Flame LED flashes during start-up. In
Control mode, the Status LED shines yellow, the Fan LED flashes, and LEDs
2-6 show the flame signal strength. Each LED corresponds to 20% of the
total flame signal. 5 lit LEDs correspond to 100% and 2 LEDs correspond to
40%.
AC 330 V
BP...
Max 0,5mA
Min 3 μA
Min 3 μA
Max 10 μA
24
BENTONE
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