11
Caution
Left-hand terminal compartment
only for low voltage if max. 12VAC/
DC
Danger
Right-hand terminal com-
partment only for mains volt-
ages of 230VAC 50-60Hz
Low voltage
max. 12VAC/DC
connection in the left-hand terminal compart-
ment!
Terminal: Connection
for:
-
Jumper terminal block S-
S1 outdoor
S2 heating
circuit
S3
Domestic hot water
S4 buffer
S5 indoor
sensor
S6 remote
adjuster*
+
not used
Z1
Option / add. function
Z2
Option / add. function
Use terminal block S- for connecting the
sensor earths of S1-S6.
The polarity of the sensors is freely selecta-
ble.
The sensors S4-S6 are optional, depending
on the hydraulic variant chosen.
Mains Voltage
230VAC 50-60Hz connec-
tion in the right-hand terminal compartment.
Terminal: Connection for:
N
Jumper terminal block N
L
Mains phase conductor L
R1
Heat circuit pump
R2 Mixer
open
R3 Mixer
close
R4 Valve/DHW
pump
R5 add.
heating
R5I add.
heating
The PE protective conductor must
be connected to the PE metal terminal block!
* Note: If the remote adjuster RC21 or a different external
fl
oating thermostat is con-
nected, the bridge at S6 has to be removed.
Connections Mains Voltage:
- Protective conductor PE metal terminal
block
- Neutral conductor terminal block N
- Mains phase conductor L
- Switch output R1-R4
- Floating contact at R5/R5I
Caution: Only suitable for 230V!
Connections low voltage:
- Temperature sensors S1 - S6
(polarity freely selectable)
- Optional additional functions Z1/Z2
D Electrical
terminals
Installation