Ferroli SUN M 50 Mode D'emploi, Installation Et Entretien page 46

Min. gas pressure switch setting
The purpose of the min. gas pressure switch is to prevent the burner starting or to stop it if operating.
If the gas pressure is not the required minimum, it must be set 40% lower than the gas pressure value
in operation with max. delivery.
Ionisation current check
The minimum value of 1 A must be respected without wide fluctuations.
Supervision of the flame with ionisation is obtained through the effect of conductivity and rectification
of the flame. The flame signal amplifier only responds to the flame signal DC component. A short circuit
between the ionisation probe and earth causes shutdown of the burner.
Key
C Electrolytic capacitor 100...470 F; DC 10...25 V
ION Ionisation probe
M Microammeter, Ri max. 5000 W
46
fig. 9
Measurement circuit
1
LME...
fig. 10
Cod. 35447686 - 04/2008 (Rev. 00)
SUN M50 - M70
M
C
ION
GB