8 Electrical installation
22
Installation and maintenance instructions flexoTHERM exclusive 0020196687_03
8.3
Electronics box
1
6
3
4
2
5
7
1
VR 32 modulating bus
coupler (optional)*
* If the system diagram
selected on the system
controller makes provi-
sion for this accessory,
it can be connected
here.
2
Controller PCB
3
VR 40 multi-functional
module (2 in 7) (op-
tional)**
** Relay 1 is used as
a fault contact connec-
tion/alarm output for the
heat pump. The function
of relay 2 can be set on
the system controller.
4
In-rush current limiter
PCB
5
Line protection switch
6
Mains connection PCB
7
Mains connection ter-
minal for the auxiliary
electric heater
8.4
Establishing the power supply
1.
Route the power supply line(s) through the holes in the
back wall of the product.
2.
Guide the lines through the product, through the appro-
priate strain reliefs and to the terminals of the power
supply and control PCB.
3.
Wire the connections as illustrated in the connection
diagrams below.
Note
There is no provision for using a wiring dia-
gram on the control or on the heat pump con-
trol panel.
4.
Tighten the strain reliefs.
8.4.1
Connecting the continuous power supply
3~/N/PE 400 V
▶
Connect the continuous power supply to the mains con-
nection (X101). (
→
Page 36)
8.4.2
Connecting the dual-circuit power supply
special tariff
–
3~/N/PE 400 V
1.
Remove the bypass line from X103 to X102 which was
installed at the factory. (
→
Page 37)
2.
Pull the plug out of contact X110A and plug it into con-
tact X110B.
◁
The control PCB (X110) is supplied with power via
the bypass line from X110B.
3.
Connect the blockable power supply to the X101 power
supply.
4.
Connect the continuous power supply to the X102
power supply.
8.4.3
Connecting the dual-circuit power supply
special tariff
–
3~/N/PE 400 V
1.
Remove the bypass line from X110A to X110 which
was installed at the factory. (
→
Page 38)
2.
Connect the continuous power supply to the X110
mains.
3.
Connect the blockable power supply to the X101 mains.
◁
Via the bypass line from X103 to X102 which was
installed at the factory, the internal electric back-
up heater is also supplied with a blockable power
supply.
8.4.4
Connecting the dual-circuit power supply
heat pump tariff
–
3~/N/PE 400 V
1.
Remove the bypass line from X103 to X102 which was
installed at the factory. (
→
Page 39)
2.
Connect the continuous power supply to the X101
power supply.
◁
The control PCB is supplied with power (unblocked)
via the bypass line from X110A to X110 which was
installed at the factory.
3.
Connect the blockable power supply to the X102 power
supply.
8.4.5
Connecting an external brine pressure
switch
In some cases (e.g. in potable water protection areas), local
authorities require the installation of an external brine pres-
sure switch that switches off the refrigerant circuit if the pres-
sure in the brine circuit falls below a certain level. If the cir-
cuit is switched off by the brine pressure switch, a fault mes-
sage is shown on the display.
▶
Pull out the X131 plug for the bypass line (source monit-
oring) on the power supply PCB.
▶
Connect an external brine pressure switch to the two
X131 terminals (Source Monitoring) on the power supply
PCB.
