Giersch GL20-Z-L-LN, Техническая информация Инструкции по установке

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Checking the operation of the flame monitor control unit
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12. Checking the operation of the flame monitor control unit
The DKO control unit uses a microprocessor-based programming sequence to produce extremely stable tim-
ings independent of fluctuations in the line voltage and ambient temperature. The built-in visual information sys-
tem allows continuous progress monitoring and provides information on the causes of a fault shutdown.
The last cause of fault is stored in the appliance and can even be reconstructed when restarting the appliance
after a power failure. The control unit is protected against under voltage. A restart takes place in all cases fol-
lowing a mains power failure.
Information system
The information system displays information on the processes in connection with burner control and monitoring.
In addition to monitoring the program, it allows faults to be localised immediately during the program sequence
or operation without the need for auxiliary devices.
The troubleshooting button has an LED. The LED is used to indicate status information and faults. The status
messages are intended for output to Satro Com and Satro Pen, and cannot be interpreted by operators due to
the rapid flashing sequence. Status messages are translated to plain text by the Satro Com and Satro Pen
devices. Faults are transferred at a slower flashing speed and can therefore be interpreted by users.
Program sequence DKO 972 Mod.22
The built-in microprocessor controls both program sequence and the information system. The individual phases
of the program sequence are indicated as flash codes.
Fault cause diagnosis
In the event of a fault, the LED remains continuously lit. Every 10 seconds, this is interrupted by the flashing code
indicating the fault that has occurred. This results in the following sequence repeats itself continually until the
fault is acknowledged, i.e. the appliance is reset.
Sequence:
Message Flashing Code
Wait until the release thermostats are closed
Pre-ignition phase
Safety and post-ignition times
Operation
Mains undervoltage
Waiting for RT or pcb fuse defective
Failure message Flashing Code Cause of fault
Fault shutdown No flame detection within the safety interval
Extraneous light
fault External light during monitored phase, sensor possibly defective
Thermostat time-out FT contact does not close within 400 sec.
LED continuously ON
Dark phase
lasting 10 secs.
lasts 0.6 secs.
Dark phase
lasting 1.2 secs.
Flashing Code
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= short pulse
= long pulse
= short interval
= long interval
Description: