ATLAS D 25 K 100 UNIT
EN
fig. 26 - Ring feed
3.5 Electrical connections
Connection to the electrical grid
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.
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)
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. 27 - Accessing the terminal board
3.6 Connection to the flue
The unit must be connected to a flue designed and built in compliance with the current
regulations. 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.
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.
fig. 28 - TEST mode
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. It is possible to set the burner to a different
power output by means of pump pressure adjustment, nozzle, head and 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 combus-
tion analyser to check that the CO
2
% in the fumes is between 11% and 12%.
Table. 2 - Burner adjustment
Oil nozzle delivery table
table 3 indicates the oil deliveries (in kg/h) as the pump and nozzle pressure changes.
N.B. - The values given in the table are approximate, since the nozzle deliveries can vary
by ± 5%. Also, for burners with a preheater, the fuel flow rate decreases by approximately
10%.
Table. 3
A
A
Heating
capacity
Burner
model
Burner
capacity
Nozzle
Pump
pressure
Head
adjustment
Air
adjustment
kW
kg/h
US
Gall/h
Angle
Code
Bar
L
Mark
28.3
SUN G6
2.24
0.60
60°
35601540
9
19
8
Pump pressure kg/cm
2
NOZZLE
G.P.H.
8
9
10
11
12
13
14
0.40
1.36
1.44
1.52
1.59
1.67
1.73
1.80
0.50
1.70
1.80
1.90
1.99
2.08
2.17
2.25
0.60
2.04
2.16
2.28
2.39
2.50
2.60
2.70
0.65
2.21
2.34
2.47
2.59
2.71
2.82
2.92
0.75
2.55
2.70
2.85
2.99
3.12
3.25
3.37
0.85
2.89
3.06
3.23
3.39
3.54
3.68
3.82
1.00
3.40
3.61
3.80
Delivery at nozzle outlet in kg/h
eco
comfort
m
o
d
e
r e s et
eco
bar
cod. 3541I100 - Rev. 02 - 10/2016
