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ELECTRICAL CONNECTIONS
The electric lines should be at an adequate distance from hot parts. It is advisable to make all connections with
flexible electric wire. Minimum section of conductors 1.5 mm
DESCRIPTION OF OPERATIONS
Switch off the general switch, if the thermostats are off, and voltage goes to the command and control device which a
short interval (9 seconds), will start up the burner according to the set program.
The air gate servomotor switches and goes into 2nd flame position; than the fan motor goes into operation and makes
the combustion chamber preventilation. At the end of the preventilation phase the combustion air gate is reset in the
1st flame position. The ignition procedure will then start and, after 3 seconds, the safety valve and "first flame" (pilot
light) valve will open up. A flame will then appear, which will be detected by the flame control device, thus completing
the ignition procedure. The air shutter control servo will then be switched on, which will move to the second flame
setting, as set by the operator in each specific case, and at the same time an auxiliary contact on the servo will activate
the second flame valve. If the flame does not light, the burner will go into the "safety shutdown" state, 3 seconds after
the opening of the gas valves (pilot and safety). If a "safety shutdown" occurs, the gas valves will be closed immedi-
ately. To go out of the shutdown state, press the red button on the burner unit.
NATURAL GAS STARTING UP AND REGULATION
(for LPG operation see the relative chapter)
Before starting up, if the burner is three-phase, check that the direction of rotation of the motor is correct.
If not already done when connecting up the burner to the gas pipes, it is essential at this point to bleed off the air in the
pipes, taking all the necessary precautions and with the doors and windows open.
Open up the pipe connection nearest to the burner and then open the gas cut-off cocks a little.
Way until there is the characteristic smell of gas, and then shut off the cock.
Wait for an appropriate time, according to the particular circumstances, until the gas has dispersed out of the room,
and then re-connect the burner to the gas pipe.
Then proceed by the following steps :
1)
Check that the combustion residue products are discharged without any kind of restriction (exhaust
pipe shutter open) and that there is water in the boiler.
2)
Open the combustion air regulator to the appropriate level (see BT 8914 "air servo regulation, type SQN 30",
according to the specific case) and open the air passage between the head and the flame disk (diffuser) to
about a third (see burner head regulation).
3)
Adjust the regulators on the safety and "first flame" valves so that the gas delivery (ignition flow rate) is at the
appropriate level.
N.B.
Refer to the specific description of the operations necessary for setting the gas delivery rate
according to the type of valves fitted to the burner (see last page).
4)
N.B.
On some burner models, the thermostat of the 2nd flame must be at 2 contacts (in exchange); please
do refer to the electric diagram of the specific burner, in case you haven't the thermostat in exchange
at two contacts, please do refer to the diagram n° 0002050151.
Switch off the second flame thermostat and send current to the burner by switching on the general switch. The
burner will thus be switched on and the pre-ventilation will be performed.
If the air pressure control manostat detects a pressure that is greater than its set value, the ignition transformer
will be activated, followed by the gas valves (safety and first flame).
The valves will open fully, and the gas delivery rate will be limited to the level that has been set, manually, on the
flow-rate regulator in the first flame (pilot) valve.
A number of "shutdowns" may occur during the first ignition, due to the following reasons:
a)
The gas pipes have not been sufficiently bled of air, so that the quantity of gas is insufficient for a
stable flame.
2
. (CEI 64/8 3.I.07).
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