Ferroli ATLAS 25 SI UNIT Instrucciones De Uso, Instalación Y Mantenimiento página 45

ATLAS 25 SI UNIT
4.2 Commissioning
Checks to be done at first lighting, and after all maintenance operations that involved dis-
connection from the systems or work on safety devices or parts of the boiler:
Before lighting the boiler
• Open any on-off valves between the boiler and the systems.
• Check the tightness of the fuel system.
• Check the pre-filling of the expansion tank
• Fill the water system and make sure that all air contained in the boiler and the system has
been vented by opening the air vent valve on the boiler and any vent valves on the system.
• Make sure there are no water leaks in the system, hot water circuits, connections or boiler.
• Make sure the electrical system is properly connected and the earth system works properly.
• Make sure there are no flammable liquids or materials in the immediate vicinity of the boiler.
• Fit the pressure gauge and the vacuum gauge on the pump (remove after starting) of the
burner.
• open the gate valves along the diesel pipe
Lighting
A
P
B
P
A
When the thermostatic line closes, the burner motor starts turning together with the pump: all the
oil sucked is sent to the return. The burner blower and the ignition transformer are also working,
therefore the following stages are carried out:
• firebox preventilation.
• prewash of a part of the oil circuit.
• preignition, with discharge between electrode tips.
B
At the end of prewash, the unit opens the electromagnetic valve: the oil reaches the nozzle, where
it is finely sprayed.
Its contact with the discharge between the electrode tips creates the flame.
The safety time begins simultaneously.
Unit cycle
A
R
SB
W
M
t1
Z
t3
BV
FR
fig. 30 - Unit cycle
R-SB-W Thermostats/Pressure switches
M Burner motor
Z Ignition transformer
BV Electromagnetic valve
FR Photoresistance
A' Beginning of ignition with pre-heater
A Beginning of ignition without pre-heater
B Flame present
C Normal operation
D Adjustment stop (TA-TC)
t1 Pre-ventilation time
TSA Safety time
t3 Pre-ignition time
t3n Post-ignition time
tw Preheating time
Output signals from the unit
Necessary input signals
VE
G
VE
G
fig. 29 - Starting
B C
t3n
TSA
Checks during operation
• Ignite the appliance as described in sec. 2.3.
• Check that the fuel circuit and water systems are airtight.
• Check the efficiency of the flue and air-fume ducts while the boiler is working.
• Check that the water is circulating properly between the boiler and the systems.
• Check the proper ignition of the boiler by performing various tests, turning it on and
off with the room thermostat or remote control.
• Check that the burner door and fume chamber are tight.
• Check that the burner works properly.
• Analyse the combustion (with the boiler unit stable) and check that the content of
CO in the fumes is between 11% and 12%.
2
• Check the parameters are programmed correctly and perform any required custom-
ization (compensation curve, power, temperatures, etc.).
4.3 Maintenance
Periodical check
To ensure correct operation of the unit over time, have qualified personnel carry out a
yearly check, providing for the following:
• The control and safety devices must function correctly.
• The fume exhaust circuit must be perfectly efficient.
• Check there are no obstructions or dents in the fuel supply and return pipes.
• Clean the filter of the fuel suction line.
• Measure the correct fuel consumption
• Clean the combustion head in the fuel outlet zone, on the swirl disc.
• Leave the burner running at full rate for approximately ten minutes, then analyse
the combustion, checking:
- All the elements specified in this manual are set correctly
- Temperatures of the fumes at the flue
- CO2 percentage content
• The air-fume end piece and ducts must be free of obstructions and leaks
• The burner and exchanger must be clean and free of deposits. For possible clean-
ing do not use chemical products or wire brushes.
• The gas and water systems must be airtight.
• The water pressure in the cold water system must be approx. 1 bar; otherwise, bring
it to that value.
• The circulating pump must not be blocked.
• The expansion tank must be filled.
• Check the magnesium anode and replace it if necessary.
The boiler casing, control panel and aesthetic parts can be cleaned with a soft
and damp cloth, if necessary soaked in soapy water. Do not use any abrasive
detergents and solvents.
Boiler cleaning
1. Disconnect the power supply to the boiler.
2. Remove the front top and bottom panel.
3. Open the door by undoing the knobs.
4. Clean the inside of the boiler and the entire path of exhaust fumes, using a tube
brush or compressed air.
5. Then close the door, securing it with the knob.
To clean the burner, refer to the Manufacturer's instructions.
Burner disassembly
• Remove the cover (B) by undoing the screw (A), thereby making all the accessories
accessible.
• Undo the nut (C) and position the burner so as to access the nozzle.
D
A
C
cod. 3541I320 - Rev. 01 - 10/2016
B
fig. 31 - Burner disassembly
EN