Lennox ROOFTOP FLEXY FCA Series Installation Operating & Maintenance Manual page 30

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IGNITION ELECTRODE
The following two checks can be made :
- Ensure that the electrode tip (1 – figure 25) is always sharp and oxide-free. Use some sand paper to clean it, if
necessary.
- The space between the tip and the air duct must be 3 mm approx. (2 – figure 26).
1
IONISATION SENSOR
- The sensor must be placed in the air duct at approximately 12.5 mm from the burner (3 – figure 27).
Check that the position is correct in the flame (see figure 28).
It must be placed just after the flame front.
There is no ionisation inside the blue cone. It reduces and reaches the end of
the flame afterwards.
Figure 25
2
3
Cône bleu
IOM / ROOF-TOP FLEXY™ Series - Page 29
Figure 26
Figure 27
Figure 28