Unigas IDEA Series, Manual, Page: 18 / 48

PART I: INSTALLATION
18
MOD. LO400 SETTINGS
Priming the pump
Before carrying out the adjustment it is necessary to start up the fuel pump, proceeding as follows:
Prior to start up the burner, make sure that the return pipe to the tank is not obstructed. Any obstruction would
cause the pump seal to break.
Start the burner, light up the photoresistor after the opening of the solenoid valve and escape the air from the pressure port.
Fuel rate adjustment
The fuel rate is setting choosing properly sized nozzles and adjusting the fuel pressure at the pump inlet (see the diagram Fig.
37 and Fig. 38). To choose the nozzles refer to Tab. 3b and Tab. 1b; for pump pressure regulation see on pag. 23. For further
information on fuel pump see also the appendix.
Choosing the light oil nozzles
Tab. 3a - Single-stage LO400
Note: all pumps are set to 12 bar. The nozzle rate must be higher than the rate referred to the minimum burner
output.
Key
EV Fuel solenoid valve
EVG1 Fuel solenoid valve - low flame
EVG2 Fuel solenoid valve - high flame (only hi-lo
flame burners)
M Manometer
P Pump
Fig. 37 - Single stage burners
Fig. 38 - Double stage burners
PUMP PRESSURE (bar)
10 12 14
NOZZLE (G.P.H.) FUEL RATE kg/h
4,00 15,19 16,64 17,98
4,50 17,09 18,72 20,23
5,00 18,99 20,81 22,47
5,50 20,89 22,89 24,72
6,00 22,79 24,97 26,97
6,50 24,69 27,05 29,21
7,00 26,59 29,13 31,46
7,50 28,49 31,21 33,71
8,30 31,53 34,54 37,30
9,50 36,09 39,53 42,70
EVG
EVG1
P
M
EVG2