41
EN
STARTING UP AND REGULATION WITH METHANE GAS
(FOR L.P.G. VERSION SEE THE RELATIVE CHAPTER)
NOTE: The burner in equipped with switch to change normally from 1st stage to 2
nd
stage.
1) Check that there is water in the boiler and that the system’s gate valves are open.
2) Check, with absolute certainty, that the discharge of combustion products can take place freely (boiler and chimney
lock-gates should be open).
3) Make sure that the voltage of the electric line to which the burner is to be connected corresponds to that required
by the burner and that the electrical connections (motor and principle lines) have been prepared to match the
voltage rating available. Cheek that all the electrical connections carried out on the spot are in accordance with our
electric wiring diagram. Open the 2nd flame thermostat circuit. Do not connect the thermostat when regulating the
let flame; in this way the 2nd flame will not be inserted.
4) Regulate the air for the ignition flame. The burner is fitted with an electric servomotor, which commands the air
shutter (see specific instructions for its regulation in the following pages).
5) By operating the, regulating devices of the gas valves open, to the amount considered necessary, the flow regulator
of the 1st flame (see instructions with regard to specific two-stage gas valve model fitted on the burner). Obviously,
if there is a flow regulator for the safety valve, it should be opened completely too.
6) With the switch on the burner’s control panel in the “0” position and the main switch inserted check, by manually
closing the relay, that the motor rotates in the right direction. If it does not exchange the places of the two cables of
the motor’s supply line in order to invert its sense of rotation.
7) Now insert the switch on the command panel. The control box receives voltage in this way and the programmer
turns on the burner as described in chapter “Description of Operations”. During the pre-ventilation phase check
that the air pressure switch effects a changeover (it should pass from a closed position without measurement of
pressure to a closed position with measurement of air pressure). If the air pressure switch does not measure
sufficient pressure (it will not effect the changeover) and neither the ignition transformer nor the gas valves will be
inserted and the control box will go to “shut down”. Successive “shut downs” can occur during the first ignition
phase due to the following reasons:
a) The gas pipeline has not been sufficiently expelled of air and therefore there is not enough gas present to permit
a stable flame.
1
BALL VALVE
2
VIBRATION DAMPER JOINT
3
GAS FILTER
4
PRESSURE REDUCER OR STABILIZER
5
PAIR OF FLANGES
6
MINIMUM AND MAXIMUM PRESSURE SWITCHES
7
RELIEF VALVE
8
SEAL CONTROL DEVICE AND RELATIVE DW
PRESSURE SWITCH
9
TWO STAGE MAIN FLAME VALVE
(CLOSED – 1
st
STAGE – 2
nd
STAGE)
10 AIR DAMPER CONTROL SERVOMOTOR
11 AIR PRESSURE SWITCH
12 COMBUSTION HEAD
13 AIR REGULATION DAMPER
14 IGNITION FLAME VALVE (PILOT) WITH SUPPLY
REGULATOR
D DISTANCE BETWEEN PRESSURE STABILIZER
AND FLANGES (about 1.5 – 2m).
SCHEMATIC DIAGRAM OF TWO-STAGE GAS
BURNER
N° 0002910630
Rev. 06/06/00
