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7.8
Electronic start delaying device
This electronic start delaying device (Fig. 27) can be wired to a
nd
2
stage thermostat; in this case it performs two functions:
1
Delay of 5 - 6 seconds in the intervention of the 2
st
valve against 1
stage valve.
2
In relation of the position of the plug A (Fig. 27), it deter-
mines the type of required operation:
A
II - I
I
II
II - I
I
II
II - I
I
II
7.9
Burner start-up cycle
Normal
Thermostat
Motor
Ignition transformer
Valve
Flame
Lock-out lamp
Start-up, calibration and operation of the burner
Position I - II
st
Burner operation in 1
nd
stage on request of the 2
thermostat.
Position II
Burner operation only in 2
stage - compulsorily.
Position I
Burner operation only in 1
stage - compulsorily.
~ 12s
nd
stage
nd
or 2
stage
nd
st
Fig. 26
Lock-out due to failure to light
21
GB
S7355
~ 12s
~ 5s
Fig. 27
D5229
Fig. 28
2903397
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