Bentone BG 450, Installation And Maintenance Instruction

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Bentone
7.5 Flame monitoring and ionisation
current check
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 AC 330 V
!
Protect the ionisation electrode from
electric shock!
Short-circuit current Max 0,5mA
Min. current for flame
detection Min 3 μA
Required current to ensure
detection Min 3 μA
Possible detection current Max 20 μA
172 615 69 20-10-15
7.6 UV-5 detector
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%.
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