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6.11
Burner operation
6.11.1 Burner starting
0s:
Load control TL closes.
Fan motor starts.
6s:
Servomotor starts: 90° rotation to right, until contact is
made on cam 1)(Fig. 24 at page 27).
The air gate valve is positioned to MAX. output.
35s:
Pre-purge stage with air delivery at MAX. output.
Duration 31.5 seconds.
66.5s: Servomotor rotates to left up to the angle set on cam
3)(Fig. 24 at page 27) (between 3 and 10°).
94s:
The air gate valve and the gas butterfly are positioned to
MIN. output. (with cam 3)(Fig. 24 at page 27) at 3°).
97s:
Ignition electrode strikes a spark.
103s: Safety valve YS and adjustment valve YR (rapid stroke)
open. The flame is ignited at a low output level (point A).
Delivery is then progressively increased, with the valve
opening slowly up to MIN output, point B.
106s: The spark goes out.
127s: The control box starting cycle ends.
6.11.2 Burner flame goes out during operation
If the flame should accidentally go out during operation, the burn-
er will lock out within 1s.
20036762
Start-up, calibration and operation of the burner
32
GB
NORMAL FIRING
NO FIRING
D3235
Fig. 34
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