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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. 25 - 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.
3.7 Condensate drain connection
The unit's condensate drain must be connected to a suitable disposal system. Carefully
comply with the specific local and national regulations on discharging condensate water
into the waste water disposal system. For boilers not using exclusively low-sulphur gas
oil (S content<50 ppm) make sure to provide for a suitable condensate neutralisation de-
vice.
Connect the condensate drain pipe located on the back of the boiler (ref. A - fig. 26) to
the waste water system neutralisation device. The condensate discharge pipes must be
acidproof and installed sloping at least 3° towards the drain, without any constrictions
and occlusions.
48
EN
ATLAS D32 CONDENS K130 UNIT
A
A
cod. 3541G840 - Rev. 01 - 10/2016
B
IMPORTANT. Fill the trap with water before starting the unit.
ATTENTION: The unit must never be operated with the trap empty!
Periodically check the water in the trap.
fig. 26 - Condensate drain
3.8 Conversion of boiler with burner to sealed chamber
B
ATTENTION: The connection with separate pipes indicated here can be done
only and exclusively with the sealed chamber kit.
A kit is available on request for converting the boiler with burner to sealed chamber. This
conversion allows the air necessary for combustion to be sucked directly from the out-
side.
For installation, refer to the instructions contained in the kit.
fig. 27 - Sealed chamber conversion kit
After installation, the unit becomes a "C type" with sealed chamber and forced draught.
The air inlet and fume outlet must be connected to one of the extraction/suction systems
specified below. The unit is approved to operate with all the Cxy flue configurations given
in these instructions. Some configurations may be expressly limited or not permitted by
law, standards or local regulations. Before proceeding with installation, check and care-
fully observe the above instructions. Also, comply with the provisions on the positioning
of wall and/or roof terminals and the minimum distances from windows, walls, ventilation
openings, etc.
Only use ducts in stainless steel, suitable for use with oil-fired condensing heat
A
generators.
A
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