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5 Operating Control and Displays
NOTICE!
During multi-stage operation, the following points are available:
Ignition point ,
1 (first stage),
1 2 (valve switch-on point, second stage),
1 2 (valve switch-off point, second stage)
2 (second level),
2 3 (valve switch-on point, third stage),
2 3 (valve switch-off point, third stage),
3 (third stage)
NOTICE!
Pre-ventilation starts as soon as the damper reaches pre-ventilation position and - if you use
a VSM - the last but one point of the fuel/air ratio curve is passed.
NOTICE!
The points are approached from above by using the overshoot-function. If you use the over-
shoot-function in operatio, you must program all points from above. Only if you do so, the re-
quired position will match the actual position.
NOTICE!
The channels’ position in the last but one curve point must be lower than at the last curve point.
Fig. 5-40 3-staged operation
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