Carrying Out The Wiring; Connecting The Circulation Pump; Connecting A Limit Thermostat For The Underfloor Heating; Connecting The Outdoor Temperature Sensor - Vaillant uniTOWER plus Operating Instructions Manual

6.13

Carrying out the wiring

1. Ensure that the mains voltage is correctly disconnected
from the safety extra-low voltage.
2. Only connect power supply cables to the terminals that
are marked for the purpose.
3. Shorten the connection cables according to require-
ments.
30 mm
≤
L
N
PE
≤ 40 mm
+
-
≤ 30 mm
4. Strip the electrical wire as shown in the figure. In doing
so, ensure that the insulation on the individual conduct-
ors is not damaged.
5. Ensure the inner conductor insulation is not damaged
when stripping the outer sheathing.
6. Only strip inner conductors just enough to establish
good, sound connections.
7. Fit conductor end sleeves on the stripped ends of the
conductors.
8. Screw the respective plug to the connection cable.
9. Check whether all conductors are inserted mechanic-
ally securely in the plug terminals. Remedy this if ne-
cessary.
10. Plug the plug into the associated PCB slot.
6.14

Connecting the circulation pump

1. Route the 230 V connection cable for the circulation
pump from the right and into the control PCB's elec-
tronics box.
2. Connect the 230 V connection cable to the plug from
slot X11 on the control PCB and plug it into the slot.
Condition: Activation of the circulation via an external button
4 3 2 1
X35
X24
9 1
10 2
11 3
12 4
13 5
FB
14 6
AF
15 7
RF
16 8
DCF
X41
▶
Connect the connection cable for the external button
using terminals 1 (0) and 6 (FB) on the X41 edge con-
nector, which is supplied with the control.
36
6
5
4
3
0
2
0
1
▶
Plug the edge connector into slot X41 on the control
PCB.
3. Set the circulation pump in the system control.
6.15 Connecting a limit thermostat for the
underfloor heating
Condition: Intermediate heat exchanger installed
▶
Remove the bypass line at plug S20 on the indoor unit's
control PCB.
▶
Connect the limit thermostat to plug S20 for the indoor
unit.
Condition: No intermediate heat exchanger installed
▶
Connect the limit thermostat to plug S20 for the outdoor
unit, → aroTHERM plus operating and installation instruc-
tions.
6.16

Connecting the outdoor temperature sensor

4 3 2 1
X35
X24
9 1
10 2
11 3
12 4
13 5
FB
14 6
AF
15 7
RF
16 8
DCF
X41
▶
Connect the connection cable for an outdoor temperature
sensor to terminals 2 (0) and 5 (AF) on the X41 edge
connector, which is supplied with the control. If a system
control is present, also connect terminal 3 (DCF) of the
edge connector.
6.17

Connecting the VR 70/VR 71 mixer module

1. Connect the power supply for the VR 70/VR 71 mixer
module to X314 on the power supply PCB.
2. Connect the VR 70/VR 71 mixer module to the eBUS
interface on the control PCB.
6.18

Installing the cover for the power supply PCB

1. Tighten all of the screws on the strain relief clamps.
2. Position the cover. Ensure that you do not damage any
cables.
3. Use the two screws to secure the cover for the power
supply PCB.
Installation and maintenance instructions 0020291525_04
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5
4
3
0
2
0
1