Unigas N18, Manual For Installation, Operation And Maintenance

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8
Fig. 5
SINGLE PIPE INSTALLATION
The burners come from the factory prepared for a twin-pipes operation, however the single-pipe operation is possible. See the
appendix for further details.
Starting up the burner
After the filling of the pre-heating tank, the burner is ready for operation.
Operate on the mains switch on the burner’s elecreical board; the pre-heating time starts until the appropriate temperature is
reached (fix it by means of the thermostat TCN).
The pre-heating resistors will continue to operate until the temperature fixed by the thermostat TR is reached.
When the thermostat TCN operates, the motor starts, activating the fan and the oil pump, starting this way the pre-purgue
phase. During this phase the heavy oil flows through the filter (1), is sucked-up by the pump (2) and introducted in the burner
pre-heating tank (3) where it is warmed up.
The heavy oil flows then through the antigas valve (7), to the nozzle (10), which is obstructed by the pin (12), flows through
the normally open valve (9) and returns to the tank.
The pre-purgue phase is needed to eliminate fuel residues remained from previous operations and to free the pipes and the
atomizer block from any kind of waste.
At the end of the pre-purgue phase, the atomizer and the burner pre-heating tank are at the same temperature.
The flame control device energizes the antigas valve (7) and the fuel pressure forces the pin (12) to move back, allowing the
fuel flowing to the nozzle (10). This way to operate is the same for all heavy oil burners.
1 Heavy oil filter
2 Heavy oil pump
3 Burner pre-heating tank
4 Heavy oil pre-heating resistor
5 Group of resistors thermostats (TR) and fuel consent thermostats (TCN)
6 Thermometer
7 Antigas valve
8 Nozzle support
9 Normally open valve
10 Nozzle
11 Manometer point
12 Nozzle obstruction pin
INSTALLATION MANUAL