Unigas PBY93, Manual For Use, Installation And Maintenance

Page: 47 / 134

47
Checking the detection current
.To check the detection signal follow the scheme in the picture below. If the signal is less than the value indicated, check the position of
the detection electrode or detector, the electrical contacts and, if necessary, replace the electrode or the detector.
Extraneous light
Extraneous light during standby (phase 12) leads to start prevention, followed by a restart.
Extraneous light during the prepurge phase leads to immediate lockout.
If extraneous light occurs during the shutdown phase, the system switches to the safety phase.
One repetition is permitted. This means that if the error occurs again the next time the system is shut down, the unit initiates lockout.
Seasonal stop
To stop the burner in the seasonal stop, proceed as follows:
1
turn the burner main switch to 0 (Off position)
2 disconnect the power mains
3 close the fuel valve of the supply line
Burner disposal
In case of disposal, follow the instructions according to the laws in force in your country about the “Disposal of materials”.
Device
Flame detector
Minimum detection signal
Siemens LMV2x/3x
QRA
70 µA (intensity of flame >24%)
Ionization probe 4 µA (values on display: 30%)
QRB
<230 k Ω (intensity of flame >16%)
QRA... (-)
QRA... (+)
1
2
X10-06
+
QRB4 Flame intensity (parameter 954) >16%
1
2
3
4
5
Protective earth PE
Ionization probe (ION)
QRB.../ QRC... signal voltage
QRB... GND
L
X10-05