Working Of The Burner - elco LO/HO-Tron 2.930 Z Instrucciones De Manejo

CHECKS TO BE MADE TO ENSURE A PROPER INSTALLATION:
Before proceeding with the filling of the fuel system and subsequent burner start up, it is advisable to carry out the
following checks:
- Power line must be adequate to system's adsorbed load
- Fuses must be adequate to the system's load
- Boiler's thermostats must have been properly connected
- Voltage and frequency must be within the specified limits
- Fuel type must be the one specified by the burner manufacturer
- Feed piping section must be adequate to the requested fuel flow rate
- Filters, cocks as well as fittings must have been properly installed
- Blast tube length must be the one specified by the boiler manufacturer
- Nozzle's flow rate of the burner must be adequate to boiler's output
BEFORE PROCEEDING WITH THE FILLING OF THE OIL SYSTEM, CHECK THE FOLLOWING POINTS:
- Motor's direction of rotation (with 3phase version)
- There must be fuel in the tank.
- Fuel cocks must be open.
- Fuel return piping must be free from obstructions.
After having checked all the above items, proceed as follows:
- Connect a fuel pressure gauge.
- Disconnect the resistors power cable from the motor's remote control switch, and insulate it
temporarily.
- Unplug the safety box.
- To press manually with a screwdriver on the pump motor's remote control switch,
until the oil system is filled up(fig.B).
Note: the oil system can be considered filled when pressure gauge will show
a constant reading.
When done, restore initial conditions.
When all the controls, as shown in previous paragraphs, have been accomplished, it will be possible to proceed with the
burner start up.
- Switch-on the burner. When reaching the preset temperature on the working thermostat, and with boiler's thermostat
closed, the control box starts the fan, the fuel pump and the ignition transformer. At the same time, the balancing
resistors are activated, to keep fuel temperature into the heater at a constant value.
- It begins, in this way, the combustion chamber prepurging, as well as the fuel circulation in the whole circuit, so as to
obtain an uniformity of temperature which allows a correct flowing of the same. The fuel pressure, during prepurging,
shall be around 16÷18 bar. If not, adjust the pressure to the specified value through the regulator "D", purposely
installed on the heating circuit (see figure).
- At the end of the prepurging, the control box shut off the solenoid valve "O" while opening the 1st stage valve (for
example valve "A"), allowing the burner ignition in Low Flame. Afterwards, it will be opened the 2nd stage valve "B"
which, while allowing the fuel flowing through both nozzles, permit the burner's High Flame ignition, i.e. at the full
power.
- In order to have a correct combustion, adjust the combustion air flow for both Low and High flame. During flow rate
adjustement, it is possible to manually switch from Low Flame to High Flame and viceversa, through the LOW/HIGH
manual switch. When all adjustments are made, leave the switch in II (HIGH) position.
- The fuel pressure during burner's working shall be set to 23 bars.
I - Low Flame
II - High Flame (with possible HIGH/LOW automatic switching through a second thermostat connected to
terminal board, as for scheme).

WORKING OF THE BURNER

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420010270104 LO/HO-Tron 2.930 / 3.2100 Z
fig. B
EN