Vaillant ecoTEC plus VU Series Installation And Maintenance Instructions Manual page 24

7.10.6 Connecting controls to the electronics
1 Safety thermostat for
underfloor heating
2 24 V control
1. Ensure that the product is voltage-free.
2. Connect the cables. (→ Page 22)
3. Connect the individual components depending on the
installation type.
Condition: If installing a multi-circuit control.
▶
Change the pump mode d.18 from Eco (intermittent
pump operation) to Comfort (continuous pump opera-
tion).
Condition: When connecting a control (230 V).
▶
Connect the control to the main plug.
▶
Remove the bridge from the 24V=RT plug.
Condition: 230 V 3-wire connection
▶
Ensure that the control is designed for a maximum nom-
inal current of 7 A.
24
24 V
Burner
24V=
off RT
1 2 3
X2
X41
X22
4
3 eBUS control or radio
receiver unit
4 Outdoor temperature
sensor, wired
X1
L N
RT
230V~
▶
Connect the control to the main plug X1.
– Terminal assignment: L – Phase, N – neutral con-
ductor,
▶
Draw the end user's attention to the fact that the follow-
ing features are present with this installation type.
◁
The frost protection function is deactivated. If the
BUS
product is installed in a room where there is a risk
of frost and it has not been protected by a room ther-
mostat, install an additional frost protection thermo-
– +
BUS
stat.
◁
The pump programmes are not active.
◁
If the product is switched off, the display is switched
off.
◁
Each time the unit is started, the fan runs for
20 seconds.
◁
Residual heat in the heating return may result in the
product blocking the burner for 10 minutes.
4. Close the electronics box.
Installation and maintenance instructions ecoTEC plus 0020238195_07
– earth