Connection To The Main Supply; Wiring System - Vaillant ecoTEC plus Instructions For Installation And Servicing

4 Boiler installation sequence
preferably adjacent to the appliance. It should be
identified as to its use.
• Alternatively connection can be made through an un-
switched shuttered socket and 3A fused 3-pin plug both
to the current issue of BS 1363 may be used, provided
they are not used in a room containing a bath or shower.
• A 3 core flexible cord according to BS6500 tables 6,
8 or 16 (3 x 0.75 to 3 x 1.5mm2) should be used.
a Caution!
This appliance must be wired in accordance
with these instructions. Any fault arising from
incorrect wiring cannot be put right under the
terms of the Vaillant guarantee.
e Danger!
Mains connection terminals L and N remain live
"unless isolated at the fused spur or electrical
outlet supplying the boiler".
Caution!
a
Do not connect any mains 230V power to the
connections 7-8-9 or BUS (+,-).
h Note!
Ensure that all cables pass through grommets
in the outer casing and are securely fixed by
the cable clamps in the rear of the electronics
box. Ensure that the power supply is connected
such that the current carrying conductors
become taut before the earth conductor should
the supply cable slip from the cable clamp.
4.4.1

Connection to the main supply

• Lower the electronics box, see fig. 4.7.
Fig. 4.7 Mains Supply Connection
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 mains supply to the terminal block, see fig
4 .8.1 the pump can be connected directly to the termi-
nal block or alternatively as shown in diagram 4 .8.2 .
18
Fig 4.8.1 Mains Supply Connection
unclip
Fig. 4.8.2 Mains supply and alternative pump switch live connection
Green/yellow (earth) wire
Blue (neutral) wire
Brown (live) wire
electronics box
a
h
• Check the electrical installation by carrying out short
circuit, earth continuity and resistance to earth tests
and a check for correct polarity.
Instructions for installation and servicing ecoTEC plus / 0020020828_05
red link *
mains supply
connection
CH pump
Note: All cables connected
to the appliance should be
permanently fixed to the wall
* Remove red link if
external 230V controls
are to be fitted
– boiler terminal Earth sign
– boiler terminal N
– 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.
pump
connecticon
230 Vac system controls
• zone valve
• programmer
• room thermostat
• cylinder thermostat
junction box
3 amp fuse
double pole isolator
230 Vac 50 Hz
permanent
supply