PART I: INSTALLATION MANUAL
15
BURNER IGNITION PROCEDURE
Oil pump
!
Check that mains voltage corresponds to the voltage indicated on the rating plate.
!
Check oil pressure in the feeding hydraulic circuit (about 2 bars at 50°C).
!
Check that the oil supply cocks are open.
!
Check that the motor rotates anticlockwise looking at the motor from the cooling cover.
!
Manually operate the burner motor command contactor until the pre-heating tank and entire burner oil circuit is full.
Factory settings during burner testing
Refer to the hydraulic diagrams on page 9 - page 10 and Fig. 14. Also see Fig. 10 on page 11.
After filling the pre-heating tank, the burner is ready for operation.
Turn on the main switch on the burner switchboard. This starts pre-heating of the oil until the temperature set on thermostat
TCN is reached. The resistors remain on until the temperature set on thermostat TR is reached.
When the contact of thermostat TCN closes, the fan motor starts up and the pre-washing phase begins. During this phase, the
oil is sucked up by the pump (24), passes through the filter (20) and is introduced into the tank (26) where it is pre-heated.
On leaving the pre-heating tank, the oil crosses the check valve (32) and reaches the nozzle U (normally closed by pin S). It
crosses the normally open valve EN1 and returns to the oil buffer tank (19); at this stage, the pressure may vary from 3 to 10
bar.
The pre-washing phase is necessary to remove possible fuel residues accumulated during the period of inactivity and comple-
tely free the piping and nozzle assembly of obstacles. During this phase, the flow of oil to the nozzles at the ideal temperature
for combustion is guaranteed.
At the end of pre-washing, the temperature at the nozzles is the same as the temperature in the pre-heating tank. The servo
control supplies the EVN1 valve, the pressure in the circuit equals the one set in the pump working on the pin causing it to move
back and allowing the oil to flow freely to the nozzle. This principle is valid for all models.
COMBUSTION HEAD SETTING
The burner is adjusted by the factory with the combustion head in the "MAX." position, corresponding to the maximum output.
To operate at a reduced power, move back the combustion head progressively, towards the "MIN." position, by means of the
screw VRT. (Fig. 14).
NOTE: Unloose the screw VB before start the setting and tight it at the end of setting.
Oil viscosity
3 ÷ 5°E (N-)
15 ÷ 50°E (D-, E-)
Burner head position: fully forward (maximum opening position)
-
-
Oil pressure measured at solenoid valve distribution block
25 bar
25 bar
Oil enabling thermostat TCN calibration
90°C
100°C
Oil thermostat TR calibration
120°C
130°C
Resistor safety thermostat TRS calibration
170°C
190°C
Plant enabling thermostat TCI (only dense oil burners)
-
80°
Thermal cutout calibration
according to motor rating plate
Fig. 14
U
S
VB
VRT
