6 Electrical installation
32
Installation and maintenance instructions Hydraulic Station 0020291544_01
6.12
Opening the control PCB's electronics box
B
A
C
1.
Hinge the electronics box forwards.
2.
Undo the four clips on the left and the right and the top
from the brackets.
6.13
Connecting the circulation pump
1.
Route the 230 V connection cable for the circulation
pump from the right and into the control PCB's electron-
ics box.
2.
Connect the 230 V connection cable to the plug from
slot
X11
on the control PCB and plug it into the slot.
3.
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.
4.
Plug the edge connector into slot
X41
on the control
PCB.
5.
Set the circulation pump in the system control.
6.14
Connecting a limit thermostat for the
underfloor heating
Condition
: Intermediate heat exchanger installed
▶
Remove the
S20
plug for the bypass line at terminal
X100
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 out-
door unit,
→
aroTHERM plus operating and installation
instructions.
6.15
Connecting the outdoor temperature sensor
Condition
: No system control connected
▶
Connect an outdoor temperature sensor to plug
AF
on
terminal
X41
on the control PCB.
6.16
Connecting the domestic hot water
cylinder's temperature sensor
Condition
: No system control connected
▶
Connect a temperature sensor to the fed cable on the
X22
terminal block (connection terminals 19/20) on the
control PCB. The range of accessories includes a tem-
perature sensor (VR 10) with corresponding mating con-
nector and an extension with corresponding plug and
bush.
6.17
Connecting the external prioritising diverter
valve (optional)
▶
Connect the external prioritising diverter valve to
X14
on
the control PCB.
–
The connection to a permanently live phase "L" with
230 V and to a switched phase "S" is available.
Phase "S" is actuated by an internal relay and
releases 230 V.
6.18
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.
6.19
Connecting cascades
▶
If you want to use cascades (max. seven units), you must
connect the eBUS line to contact
X30
via the
VR32b
bus
coupler (accessory).
6.20
Closing the electronics box for the power
supply PCB
1.
Tighten all of the screws on the strain relief clamps.
2.
Close the cover on the electronics box.
3.
Hinge the electronics box back up.
6.21
Checking the electrical installation
▶
After the installation is complete, check the electrical in-
stallation to ensure that the connections that have been
established are secured properly and are sufficiently in-
sulated.
