Start-Up Problems - Riello MG569-BWZG Installation, Use And Maintenance Instructions

4.1

Start-up problems

Faults
The burner does not start when
the heat request thermostat
closes.
Burner runs normally in pre-
purging and ignition cycle and
locks out after the safety time.
Burner starts with an ignition
delay.
The burner does not switch to
the 2nd stage.
The burner locks out after the
pre-purge phase due to flame-
failure.
The burner locks out during the
pre-purge phase.
The burner continues to re-
peat the starting cycle without
going on lockout.
Faults - Possible causes - Solutions
Possible Causes
Lack of electrical supply.
Lack of gas.
The gas pressure switch does not close its
contact.
The connections in the control box are wrongly
inserted.
The air pressure switch is changed over to the
operational position.
The phase-neutral connection is inverted.
The earth connection lacks or is inefficient.
The ionisation probe is earthed or not in con-
tact with the flame, or its wiring to the control
box is broken, or there is a fault on its insulation
to the earth.
The ignition electrodes is wrongly positioned.
Air flow rate is too high.
Valve brake is too close with insufficient gas
output.
The air damper opener is jammed.
The 2nd stage gas valve does not energise.
The solenoid valves is passing too little gas.
The solenoid valves are defective.
The ignition arc is irregular or has failed.
The pipe has not been purged from the air.
The air pressure switch does not change over
to the operational position.
The flame exists.
The gas pressure in the gas-mains lies very
close to the value to which the gas pressure
switch has been set.
The sudden drop in pressure when the valve is
opened provokes the opening of the pressure
switch itself, so the valve closes again immedi-
ately and the motor stops.
The pressure then starts to increase again, the
pressure switch closes, the start-up cycle be-
gins again and so on.
Solution
Check presence of voltage in the L1-N clamps of
the 7 pin plug.
Check the conditions of the fuses.
Check that safety thermostat (TS) is not in lockout.
Check the gate opening.
Check that the valves charge over to the opening
position and there are not short circuits.
Adjust them.
Check and connect completely all the
plugs.
Replace the pressure switch.
Invert them.
Make the earth connection efficient.
Check the right position and if necessary set it ac-
cording to the instructions of this manual.
Reset the electrical connection.
Replace the faulty connection.
Adjust it according to the instructions of this man-
ual.
Set the air output according to the instructions of
this manual.
Adjust it.
Check that it is working properly.
Check the precise electrical connection.
Valve broken: replace it.
Check the air damper opener works properly.
Check the pressure in the network and/or adjust
the solenoid valve according to the instructions of
this manual.
Change them.
Check the right insertion of the connectors.
Check the right position of the electrode according
to the instructions of this manual.
Carry out a complete breathing of the line of gas-
supply.
The pressure switch is faulty, replace it.
The air pressure is too low, (the head is bad adjust-
ed).
Faulty valves: replace them.
Lower and set the pressure switch.
21 GB
Tab. I
20142714