Connecting A Low Loss Header Sensor; Additional Relay (Grey Plug On The Pcb) And Vr40 - "2 In 7" Multifunctional Module - Vaillant ecoTEC VU 466/4 Installation And Maintenance Instructions Manual

connection terminals 7, 8, 9) the bridge between
terminal 3 and 4 must remain inserted.
• 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 Chapter 4.8).
• To choose pump operating mode 1 (running on of
pump) for multi-circuit controllers, change the setting
at diagnosis point "d.18" (pump operating mode) from
3 "intermittent" to 1 "run on" (see Chapter 7.2.2).
Observe that the bridge at the ProE plug must be
removed when connecting a maximum thermostat
(contact thermostat) for underfloor heating.

5.8.3 Connecting a low loss header sensor

The low loss header sensor must either be connected to
the X41/RF according to the connection diagram
(Fig. 5.15) or to the selected controller (see
corresponding operating manual).
5.8.4 Additional relay (grey plug on the PCB) and
VR40 - "2 in 7" multifunctional module
Additional relay (grey plug on the PCB)
With the ecoTEC it is possible to actuate one additional
component via the additional relay. You can select the
installed components via diagnosis point "d.26" at
diagnosis level 2 (see Chapter 9.1.2).
VR40 - "2 in 7" multifunctional module
If you wish to connect additional components this can
be done using the Vaillant VR40 - "2 in 7"
multifunctional module.
h Note!
Please observe the separate manual attached
to the VR40 - "2 in 7" multifunctional module.
Carry out the installation in accordance with the
corresponding operating and installation manual.
To actuate relay 1 at the multifunctional module select
diagnosis point "d.27" at diagnosis level 2, and to
actuate relay 2 select diagnosis point "d.28"
(see Chapter 9.1.2). You can select the following
components here:
1 = circulation pump
2 = external pump
3 = charging pump
4 = vapour extraction hood
5 = external solenoid valve
6 = external fault message
7 = not active
8 = remote control eBUS (not active)
9 = legionella pump (not active)
Installation and maintenance instructions ecoTEC 0020029172_03
Installation 5
21