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ATLAS D 50 UNIT
3.5 Electrical connections
Connection to the electrical grid
B
The unit's electrical safety is only guaranteed when correctly connected to an
efficient earthing system executed according to current safety standards. Have
the efficiency and suitability of the earthing system checked by professionally
qualified personnel. The manufacturer is not responsible for any damage
caused by failure to earth the system. Also make sure that the electrical system
is adequate for the maximum power absorbed by the unit, as specified on the
boiler dataplate.
The boiler is prewired and provided with a Y-cable and plug for connection to the elec-
tricity line. The connections to the grid must be made with a permanent connection and
equipped with a bipolar switch whose contacts have a minimum opening of at least 3
mm, interposing fuses of max. 3A between the boiler and the line. It is important to re-
spect the polarities (LINE: brown wire / NEUTRAL: blue wire / EARTH: yellow-green
wire) in making connections to the electrical line. During installation or when changing
the power cable, the earth wire must be left 2 cm longer than the others.
B
The user must never change the unit's power cable. If the cable gets damaged,
switch off the unit and have it changed solely by professionally qualified person-
nel. If changing the electric power cable, use solely "HAR H05 VV-F" 3x0.75
mm2 cable with a maximum outside diameter of 8 mm.
Room thermostat (optional)
B
IMPORTANT: THE ROOM THERMOSTAT MUST HAVE VOLTAGE-FREE
CONTACTS. CONNECTING 230 V TO THE ROOM THERMOSTAT TERMI-
NALS WILL PERMANENTLY DAMAGE THE ELECTRONIC BOARD.
When connecting time controls or a timer, do not take the power supply for
these devices from their breaking contacts Their power supply must be by
means of direct connection from the mains or with batteries, depending on the
kind of device.
Accessing the electrical terminal block
Undo the two screws "A" located on the top part of the control panel and remove the
cover.
fig. 22 - Accessing the terminal board
3.6 Connection to the flue
The unit must be connected to a flue designed and built in compliance with current reg-
ulations. The pipe between the boiler and flue must be made from material suitable for
the purpose, i.e. heat and corrosion resistant. Ensure the seal at the joints and insulate
the entire pipe between boiler and flue, to prevent the formation of condensate.
4. SERVICE AND MAINTENANCE
All adjustment, conversion, commissioning and maintenance operations described be-
low must only be carried out by Qualified Personnel (meeting the professional technical
requirements of current regulations) such as the personnel of the Local After-Sales
Technical Service.
FERROLI declines any liability for damage and/or injury caused by unqualified and un-
authorised persons tampering with the unit.
4.1 Adjustments
TEST mode activation
Press the heating buttons (details 3 and 4 - fig. 1) together for 5 seconds to activate the
TEST mode. The boiler switches on irrespective of the system or DHW request.
The heating symbol (detail 24 - fig. 1) and DHW symbol (detail 12 - fig. 1) flash on the
display.
To deactivate the Test mode, repeat the activation sequence.
The TEST mode is automatically disabled in any case after 15 minutes.
Burner adjustment
The burner is factory-set as given in table 2. The burner can be set to a different power
output by adjusting the pump pressure, nozzle, head or air adjustment as described in
the following sections. In any case, the new power setting must come within the boiler's
nominal working range. After making any adjustments, use a combustion analyser to
check that the CO
Table. 2 - Burner adjustment
Boiler
Heating
model
capacity
kW
ATLAS D 50
56.6
UNIT
Oil nozzle flowrate table
The oil flow rates (in kg/h) according to the variation in pump pressure and nozzles are
given in table 3.
N.B. - The values given below are approximate, since the nozzle deliveries can vary by
± 5%. Also, for burners with a preheater, the fuel flow rate decreases by approx. 10%.
Table. 3
Pump pressure (bar)
NOZZLE
G.P.H.
0.40
0.50
0.60
0.65
0.75
0.85
1.00
1.10
1.20
1.25
1.35
cod. 3541I330 - Rev. 00 - 04/2016
fig. 23 - TEST mode
% in the fumes is between 11% and 12%.
2
Burner
Burner
Nozzle
model
flow rate
US
kg/h
Angle
Fault
Gall/h
SUN G10
4.48
1.1
60°
35601280
9
10
11
1.44
1.52
1.59
1.80
1.90
1.99
2.16
2.28
2.39
2.34
2.47
2.59
2.70
2.85
2.99
3.06
3.23
3.39
3.61
3.80
3.99
3.97
4.18
4.38
4.33
4.56
4.78
4.50
4.75
5.00
4.87
5.13
Delivery at nozzle outlet in kg/h
Pump
Head
Air
pressure
adjustment
adjustment
Bar
L
Notch
12
16
6
12
13
14
1.67
1.73
1.80
2.08
2.17
2.25
2.50
2.60
2.70
2.71
2.82
2.92
3.12
3.25
3.37
3.54
3.68
3.82
4.16
4.33
4.50
4.58
4.77
4.95
5.00
43
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