Miele T 980x - Figure 031-3: Drying Process, after Gas Has Started to Flow; Figure 031-4: Drying Process, Flowing Gas Ignites the Flame

Technical Information
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T 980x/T 982x
At the start of the drying process, flame sensor B1/16 is in a cool state and is
closed. Gas solenoid valve Y57/2 is not carrying voltage and is therefore
closed. At the demand for heating, both heater relays 1K1/1 and 2K1/1 close.
Maintaining and booster coils of gas solenoid valve Y57/1 carry voltage so
gas solenoid valve Y57/1 opens; igniter electrode E1/1 receives voltage and
slowly starts to glow. Since both gas solenoid valves Y57/2 and Y57/1
switched in sequence are not open, gas does not yet flow.
Figure 031-3: Drying Process, After Gas Has Started to Flow
Once the heat radiance on flame sensor B1/16 is strong enough, the thermostat
opens. Now igniter electrode E1/1 no longer carries voltage. However, now gas
solenoid valve Y57/2 is receiving voltage (via low-ohmic igniter electrode E1/1), so
it opens. Since gas solenoid valve Y57/1 is still open via its maintaining coil, gas
now flows into the burner and ignites at red-hot igniter electrode E1/1.
Figure 031-4: Drying Process, Flowing Gas Ignites the Flame
The flame is on. The flame keeps flame sensor B1/16 open and at temperature.