Vaillant ecoTEC plus SERIES, Instructions For Installation And Servicing

Page: 22 / 52

Installation and Servicing ecoTEC plus
22
Fig. 4.8 Mains Supply Connection
Fig. 4.7 Mains Supply Connection
4.4.1 Connection to the main supply
• Lower the electronics box, see fig. 4.7.
Opening the electronics box
• Unclip the bottom of the electronics box cover and
hinge back to reveal the connection plugs.
• Feed the power supply flex into the appliance
and the electronics box through the cable clamps
provided.
4.4.2 Wiring system
• Connect the flex to the L, N and earth terminal
block, see fig 4.8.
Green/yellow (earth) wire – boiler terminal Earth
sign Blue (neutral) wire – boiler terminal N
Brown (live) wire – boiler terminal L
Caution!
Do not connect any mains 230V power to the
connections 7-8-9 or BUS (+,-).
Note!
Ensure that the wires are securely fixed in the
terminal block.
• Refit the electronics box cover by pushing
into place until it clips back into position.
• Raise the electronics box.
• Check the electrical installation by carrying out
short circuit, earth continuity and resistance to earth
tests and a check for correct polarity.
4 Boiler installation sequence
UNCLIP
ELECTRONICS BOX
fuse T2E
250 Volts
Pump
connection
Mains supply
connection
9 8 7 + - 4 5 3
230V 24V BUS
N L N L
N L
I
X2
X20
9 4 5 3 N L I