Connecting Controllers; A Caution; H Note - Vaillant ecoTEC VU 656/4 Installation And Maintenance Instructions Manual

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3
Fig. 5.14 Opening back wall of the electronic box
Fig. 5.15 Example for cable routing
• Remove the front casing of the boiler (see
Chap. 4.8) and tilt the electronic box (2) forwards.
• Unclip the rear cover (1) of the electronic box at the
fastening points (3) and fold it up.
• Use a commercially available mains connection cable.
• Guide the mains connection cable through a cable
duct (4). Use the grommet to seal the opening.
• Then feed the mains connection cable into the
electronic box and cut the line to the correct length.
Installation and maintenance instructions ecoTEC 0020029173_01
- + 7 8 9 L N 3 4 5
BUS
- + 7 8 9 L N 3 4
BUS
• Cover the supply line over a length of
approximately 2 - 3 cm and insulate the cores.
a 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.
• Connect the cores to the plug-in locations in the
1
electronics (L, N and Earth), see Fig. 5.15, using the
2
corresponding ProE plug.
• Close the rear cover of the electronic box until it
audibly engages.
• Lift the electronic box up and press the two clips on
the left and right of the box against the side casing of
the boiler until they audibly engage.
• Mount the front casing (see Chap. 4.8).

5.8.2 Connecting controllers

Mount the controllers in accordance with the
corresponding operating and installation manuals.
The required connections to the electronic system of
the boiler (e.g. for external controllers, external sensors
etc.) should be performed as follows:
• Remove the front casing of the boiler (see Chap. 4.8)
and tilt the electronic box (2) forwards (see Fig. 5.14).
• Unclip the rear cover (1) of the electronic box at the
fastening points (3) and lift it up (see Fig. 5.14)
• Guide the supply lines of the relevant components to
be connected through the cable ducts (4). Leave the
existing seals in the other cable ducts, to seal the
vacuum chamber.
• Then feed the mains supply lines into the electronic
box and cut the lines to the correct length.
• Cover the supply line over a length of
approximately 2 - 3 cm and insulate the cores.
• Connect the cores to the corresponding ProE plugs, or
plug-in locations of the electronics, as shown in
Fig. 5.15 (see connection diagram in Chap. 5.8.5).
a Caution!
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Danger of destroying the electronics!
Do not connect a mains voltage supply to the
following terminals: 7, 8, 9, eBUS (+,-)!
h Note!
Make sure that the electrical connections are
carried out in accordance with standards and
that they are mechanically secure.
• If a roomthermostat/timer is not connected, you must
insert a bridge between terminals 3 and 4, if not
already installed. Remove the bridge if you connect a
corresponding room/thermostat timer to terminals
3 and 4.
Installation 5
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