Unigas P20, Installation, Operation And Maintanance Manual

Page: 49 / 52

APPENDIX: COMPONENTS CHARACTERISTICS 49
Control program in the event of fault
!
If a fault occurs, all outputs will immediately be deactivated (in less
than 1s).
!
On restoration of power, a restart will be made with the full progra
sequence.
! If the operating voltage drops below the undervoltage thresold.
!
If there is a premature faulty flame signal during t1, a lockout
occurs.
! If the contact of air pressure monitor LP has welded in the working
position, prevention of startup and, after 8.5s: lockout.
!
If the contact of the air pressure monitor LP has welded in the idle
position: lockout at the end of t10.
!
If the burner doesn't ignite by the end of TSA: lockout
!
If flame is lost during operation: lockout
IMPORTANT:
!
The release of the equipment can be carried out after each stop
pressing the release button for 0.5- 3 seconds. Then the equipment
pulses to signal the happened release.
!
To control the stop cause it is necessary to wait for 10 seconds,
then press the release button for more than 3 seconds and count pul-
ses (the equipment repeats pulses at regular intervals).
Flame control device stopped
- Stop red lamp switched on.
Release of the flame control device
- Press the release button for 0.5 ÷ 3 seconds.
Diagnosis of troubles
- Wait at least 10s.
- Press the release button for >3s.
- Count the number of flashing of the green lamp and compare with
the “Diagnosis Table”
Internal diagram LMG21/25
Diagnosis table
Number of flashing
- Possible causes
2 flashing **
No flame at the end of the "Safety time":
- Detection electrode dirty
- Fuel valve faulty
- Gas doesn't reach the burner
3 flashing ***
The air pressure switch doesn't commute or is at rest:
- Pressure switch faulty
- The fan motor doesn't work
- Air lock servocontrol (where arranged) faulty
4 flashing ****
The air pressure switch is not commuted at rest as well as on air,
or it remains commuted on air:
- Pressure switch faulty
- The calibration of air pressure switch is too sensible
5 flashing *****
Foreign light
7 flashing *******
Lack of flame during working:
- Calibration of the burner not optimum
- Trouble or gag of the fuel valve
8 ÷ 17 flashing *** ÷ ****
Not used
18 flashing ******************
During pre-ventilation the oressure switch commutes and then
comes back to the rest:
- Air pressure switch faulty or calibration too high
19 flashing *******************
Trouble of contacts outlet:
- Errors of electric connection
- Anomalous voltage to outlet terminals
20 flashing ********************
Internal error of the flame control equipment
Internal diagram LMG22