2750
10
GB
The sequence of pulses issued by the control box identifies the possible types of malfunction, which are
listed in the table below.
5.
WARNINGS TO AVOID BURNOUT OR BAD COMBUSTION OF THE BURNER
1
–
When the burner is stopped, the smoke pipe must be opened and effect a natural draught in the
combustion chamber. If the smoke pipe is closed, the burner must be drawn back till the extraction
of blast tube from the furnace. Before operating in this way take the voltage off.
2
–
The place, where the burner works, must have same openings suitable for the passage of air
necessary for combustion. To be sure about this, you have to control CO2 and CO in the exhaust
gases with all the windows and doors closed.
3
–
If in the place, where the burner works, there are air-breathings, check the existence of air-input
openings with dimensions suitable for the necessary air-exchange. In any case check that, when
the burner is stopped, the air-breathings do not draw warm smokes from pipes through the burner.
6.
MAINTENANCE
The burner requires periodic maintenance carried out by a qualified and authorised technician
in conformity
with legislation and local standards
.
Maintenance is essential for the reliability of the burner, avoiding the excessive consumption of fuel and
consequent pollution.
Before carrying out any cleaning or control always first switch off the electrical supply to the
burner acting on the main switch of the system.
THE BASIC CHECKS ARE:
Leave the burner working without interruption for 10 min., checking the right settings of all the components
stated in this manual. Then carry out a combustion check verifying:
CO
2
( %) content
Smoke temperature at the chimney
CO content (ppm).
SIGNAL
PROBABLE CAUSE
2 pulses
The flame does not stabilise at the end of the safety time:
– faulty ionisation probe;
– faulty or soiled gas valves;
– neutral/phase exchange;
– faulty ignition transformer
– poor burner regulation (insufficient gas).
3 pulses
Minimum air pressure switch does not close:
– make sure VPS trips to produce lockout;
– air pressure switch faulty;
– air pressure switch incorrectly regulated;
– fan motor does not run;
– maximum air pressure switch operating.
4 pulses
Min. air pressure switch does not open or light in the chamber before firing:
– air pressure switch faulty;
– air pressure switch incorrectly regulated.
7 pulses
Loss of flame during operations:
– poor burner regulation (insufficient gas);
– faulty or soiled gas valves;
– short circuit between ionisation probe and earth.
10 pulses
– Wiring error or internal fault.
