Connection To The Main Supply - Vaillant ecoTEC PLUS SERIES Installation And Maintenance Manual

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.
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.

4.13.2 Connection to the main supply

• Remove the front case and lower the control panel.
Fig. 4.13 Opening the electronics box
• Unclip the bottom of the terminal box cover and hinge
back to reveal the connection plugs.
• Pull out the power L, N and earth plug.
• Feed the power supply flex into the appliance and the
control panel through the cable clamps provided and
tighten.
Installation and maintenance manual ecoTEC
Boiler installation sequence 4
Fig. 4.14 Wiring system
• Connect the flex to the L,N and earth plug, reconnect
plug to terminal 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.
• Refit the terminal box cover by pushing into place until
it clips back into position.
• Raise the control panel.
- + 7 8 9 L N 3 4 5
- + 7 8 9 L N 3 4 5
– boiler terminal N
– boiler terminal L
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