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Head and air shutter
Adjust the head and air flow rate according to the burner power as indicated in fig. 29
Turn the head adjustment screw B (fig. 30) clockwise or anticlockwise until the mark on
rod A (fig. 30) coincides with the pointer.
fig. 29 - Burner adjustments graph Prodotto_Gr1
A
Power
B
Adjustment pointer
C
Oil flow rate
"L" head (mm)
Air
To adjust the air flow, turn screw C (fig. 30) after loosening nut D. After making the ad-
justment, tighten nut D.
fig. 30 - Burner adjustment
Position of electrodes - baffle
After fitting the nozzle, check correct positioning of the electrodes and baffle, according
to the values given below. It is advisable to check the values after every operation on the
head.
3
L
1
fig. 31 - Electrode - baffle position
4.2 Commissioning
B
Checks to be made at first lighting, and after all maintenance operations involv-
ing disconnection from the systems or an operation 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 sys-
tem has been vented by opening the air vent valve on the boiler and any vent valves
on the system.
46
EN
ATLAS D CONDENS UNIT
•
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
Start-up
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 trans-
former 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 noz-
zle, where it is finely sprayed.
Its contact with the discharge between the electrode tips creates the flame.
The safety time begins simultaneously.
Unit cycle
R-SB-W Thermostats/Pressure switches
OH
OIl pre-heater
OW
Operation enabling contact
M
Burner motor
Z
Ignition transformer
BV
Electromagnetic valve
FR
Photoresistance
A'
Starting with pre-heater
A
Starting 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
Pre-heating time
Output signals from the unit
Necessary input signals
cod. 3541B625 - Rev. 03 - 03/2015
VE
P
VE
P
fig. 32 - Starting
t3n
tw
t1
t3
TSA
fig. 33 - Unit cycle
G
G
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