Vaillant ecoMAX 646 Installation And Maintenance Manual - page 15
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Installation and maintenance manual ecoMAX 646 / 0020020158_02
Refer to ‘BS 6798 Specification for installation of gas–
fired boilers of rated input not exceeding 70 kW net’ for
further information. Before operating the boiler the con-
densate trap (1) must be filled with water as described in
relevant section.
4.8 Electrical
connection
Danger!
Electrocution caused by touching live parts can
be fatal. Before working on the appliance, turn
off the power supply and secure against restart.
Danger!
This appliance must be earthed.
Danger!
Mains connection terminals L and N remain live
even when the boiler on/off control is switched
off.
Note!
Do not connect 230 V mains to the connections
7-8-9 or BUS (+,-).
Note!
Ensure that all cords pass through the cable
clamps in the rear of the control box and are
securely fixed. Ensure that the power supply is
connected such that the current carrying con-
ductors become taut before the earth conduc-
tor should the supply cord slip from the cable
clamp.
All electrical work shall be carried out by a competent
person and shall comply with BS 7671 (IEE Regulations).
In the Republic of Ireland, reference should be made to
the current edition of the ETCI (Electro-Technical Council
for Ireland) rules. The boiler is supplied for connection to
230 V, ~ 50 Hz supply fused at 3 A rating. Connection to
the mains supply shall be made via a fused 3 pin plug to
an unswitched shuttered socket, both complying with the
requirements of BS 1363.(Alternatively, connection may
be made via a 3 A fused double pole isolator having a
contact separation of at least 3 mm in all poles and sup-
plying the boiler and con-trols only). The point of connec-
tion to the mains supply must allow complete electrical
isolation of the boiler and its ancillary controls. It should
be readily accessible and adjacent to the boiler. A 3 core
flexible cord according to BS 6500 tables 6, 8 or 16 (3 x
0.75 to 3 x 1.5 mm2) should be used.
4.8.1 Mains
connection
• Remove the front case and lower the control panel.
• Unclip the bottom of the terminal box cover and hinge
back to reveal the connection plugs.
• Feed the power supply flex into the appliance and the
control panel through the cable clamps provided and
tighten
• Connect the flex to the L, N and earth plug to the
ProE connector.
Caution!
Supplying power to the wrong plug terminals of
the Pro E system can destroy the electronics.
Only connect a 230 Vac live supply to boiler
terminal connections marked LNE.
The rated voltage of the mains must be 230 V; at rated
voltages above 253 V and under 190 V, functional im-
pairments are possible.
The mains supply must be connected via a fixed connec-
tion and a separator with a contact opening of at least
3 mm (e.g. fuses, circuit breakers).
4.8.2 Connecting
controllers
Mounting is to be carried out as stated in the relevant
installation manual. The necessary connections to the
boiler‘s electronics (e.g. when using external controllers,
external sensors or similar devices) are to be performed
as follows:
• Remove the front casing of the appliance and lower
the control panel.
• Unclip the back cover (2) of the electronic box from
its fixings (3) and lift it up.
• Feed the connecting cables of each of the component
to be connected through the cable clamps (4) located
on the bottom of the appliance to the left.
4
2
1
3
Fig. 4.13 Opening the rear of the electronics box
Installation 4