When the regulator receives a heat request, voltage is applied to the gas solenoid valve and the ignition control generates sparks via the DZÜ 2 ignition transformer. The ignition switches off immediately on receipt of the flame message, the starting gas solenoid valve remains open. If no flame is generated during the safety interval of 5 seconds (SZA), fault interlock is performed. If a flame occurs when the regulator is switched on, the program sequence is blocked . On flame loss during operation, the gas valve is switched off within 1 second (SZB).

 

Fault release: By means of an integrated button or externally via NOC from terminal 2 to 8.

 

The ignition control system is integrated on the PCB. Approximately 5 ignition sparks are created per second at 200 V by capacitor discharge via a thyristor on the primary coil of the ignition transformer. This is increased to 10-15 kV by the ignition transformer. Plug the DZU 2 directly into the electrode which carries out ignition and flame detection. Due to the direct connection between the ignition transformer and the ignition electrode, no high-voltage cable is required. Line loss and radio interference are minimized. The DGAI. 27F/3 can be operated with separated ignition and monitoring electrodes for end-point monitoring. Tie the black wire of DZU 2 to ground and connect the monitoring electrode to terminal 9.

 

Fuses: External protection of automatic burner control using a 6.3 medium time-lag back-up fuse or 10 A fast back-up fuse.

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