Connection To The Main Supply - Vaillant ecoTEC plus 612 Instructions For Installation And Servicing

4 Boiler installation sequence
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 controls 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
2
0.75 to 3 x 1.5 mm ) should be used.
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 any power voltage to the con-
nections 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 conductor
should the supply cord slip from the cable clamp.

4.14.2 Connection to the main supply

Fig. 4.13 Opening the electronics box
24
• 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.
Fig. 4.14 Wiring system
• Connect the flex to the L, N and earth plug to the ter-
minal block.
Green/yellow (earth) wire – boiler terminal Earth sign
Blue (neutral) wire
Brown (live) wire
Note
Do not connect any power voltage to the con-
nections 7-8-9 or BUS (+,-).
Note
Ensure that the wires are securely fixed in the
terminal block.
• Refit the terminal box cover by pushing into place
until it clips back into position.
• Raise the control panel.
Instructions for installation and servicing ecoTEC / 839592_09
- + 7 8 9 L N 3 4 5
- + 7 8 9 L N 3 4 5
– boiler terminal N
– boiler terminal L