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8
Electrical installation
8.6
Connecting additional components
Caution.
b
Risk of damage caused by incorrect
installation.
Connecting wires that have been stripped
too far may cause short circuits and dam-
age the electronics if a strand accidentally
comes loose.
> Only strip the outer sheathing of flexible
cables to a maximum of 3 cm to prevent
short circuits.
> Lay the lines correctly.
> Use strain reliefs.
You can actuate an additional component with the aid of
the auxiliary relay that is installed in the ecoTEC plus VUI
GB 937 and you can actuate two other components using
the multi-functional module.
You can actuate the following components:
– Circulation pump
– External pump
– Cylinder charging pump
– Extractor hood
– External solenoid valve
– External fault signal
– Solar pump (not active)
– eBUS remote control (not active)
– Legionella protection pump (not active)
– Solar valve (not active)
8.6.1
Connecting an auxiliary relay (grey plug on
the PCB)
i
You can connect the additional component to
the integrated auxiliary relay using the grey plug
on the PCB.
> Perform the wiring in the same way as in ¬ section 8.5.
> To start up the connected components, select the com-
ponents using diagnostics code "D.026" in the installer
level (¬ section 11.1).
8.6.2 Connecting a VR 40 – "2 from 7" multi-
functional module
You can connect additional components to the ecoTEC plus
using the Vaillant multi-functional module 2 in 7 (accesso-
ries).
> Fit the components in accordance with the relevant oper-
ating and installation instructions.
> In the installer level, select diagnostics code "D.027" to
actuate relay 1 on the multi-functional module (¬ sec-
tion 11.1).
34
> In the installer level, select diagnostics code "D.028" to
actuate relay 2 on the multi-functional module (¬ sec-
tion 11.1).
8.7
Actuating the circulation pump
demand-controlled
You can actuate the circulation pump for a domestic hot
water cylinder demand-controlled using the ecoTEC plus.
Caution.
b
Risk of damage caused by incorrect
installation.
Connecting wires that have been stripped
too far may cause short circuits and dam-
age the electronics if a strand accidentally
comes loose.
> Only strip the outer sheathing of flexible
cables to a maximum of 3 cm to prevent
short circuits.
> Lay the lines correctly.
> Use strain reliefs.
> Perform the wiring in the same way as in ¬ section 8.5.
> Connect the supply line of the external button with ter-
minals X41/1
(0) and X41/6 (FB) on the PCB (¬fig. 8.5).
i
The edge connector required for this is included
with your controller.
i
To operate a circulation pump, we recommend
using the accessory set with article number
0020057235.
i
Using a circulation pump negatively affects hot
water comfort, as it causes turbulence and dis-
rupts the stratification in the cylinder.
> Limit the flow rate of the circulation pump in order to
prevent the hot water handling from being negatively
affected.
i
Using a circulation pump increases energy con-
sumption.
Installation and maintenance instructions ecoTEC plus 0020134833_01
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