10
420010355103
Max P15-25 / P15-25 AB
EN
NOZZLE CLEANING AND REPLACEMENT
Use only the suitable box wrench provided for this operation to remove the nozzle, taking care to not damage
the electrodes. Fit the new nozzle by the same care. Note: Always check the position of electrodes after having
replaced the nozzle (see illustration). A wrong position could cause ignition troubles.
VERIFY:
- That piping system is perfectly sealed.
- That the use of hoses is avoided whenever is possible (use copper pipes preferably).
- That depression is not greater than 0,45 bar, to avoid pump’s cavitation.
- That check valve is suitably designed for the duty.
The pump pressure is set at a value of 12 bar during the testing of burners. Before starting the burner, bleed the air
in the pump through the gauge port. Fill the piping with light-oil to facilitate the pump priming. Start the burner
and check the pump feeding pressure. In case the pump priming does not take place during the first prepurging,
with a consequent, subsequent lock-out of the burner,
rearm the burner’s lock-out to restart, by pushing the
button on the control box. If, after a successful pump
priming, the burner locks-out after the prepurging, due
to a fuel pressure drop in the pump, rearm the burner’s
lock-out to restart the burner. Do
never allow the pump working
without oil for more than three
minutes. Note: before starting the
burner, check that the return pipe is
open. An eventual obstruction could
damage the pump sealing device.
1 - HOSE
2 - OIL FILTER
3 - OIL COCK
BURNER START-UP AND ADJUSMENT
Once having installed the burner, check the following items:
- The burner power feeding and the main line protection fuses
- The correct length of pipes and that the same are sealed.
- The type of fuel, which must be suitable for burner.
- The connection of boiler’s thermostats and all the safeties.
When all the above mentioned conditions are checked and accomplished, it is possible to go on with burner’s
tests. Power the burner. The control box feeds the ignition transformer and the burner’s motor at the same
time, which will run a prepurging of the combustion chamber for about 20 sec.
At the end of prepurging, the control box opens the fuel pump and the 1st stage (Low flame) solenoid valves,
the ignition transformer produces a spark and the burner ignites. After a safety interval of 5÷10 seconds and a
correct ignition, the control box turns off the ignition transformer and, 10 seconds later, sets the air damper
to its maximum opening and opens the 2nd stage solenoid valve (High flame). In case of faulty ignition, the
control box switches the burner into safety condition. In order to obtain an optimal combustion, it is neces-
sary adjust the LOW - HIGH flame air flow, according to the instruction given further on. The fuel pump
feeding pressure, must remain around 12 bar.
3
2
1
1
3
2
1
1
6 mm
4 mm
6 mm
4 mm
MAX 25 AB
