Appendix
36 Installation instructions 0020237057_01
C Connecting the actuators, sensors and sensor assignment for the VR 70 and VR
71
C.1 Legend for connecting the actuators and sensors
Legend
point
Meaning Legend
point
Meaning
9e Domestic hot water generation prioritising diverter
valve
FSx Flow temperature sensor for heating circuit x
BH Back-up boiler 9kxcl Heating circuit mixer is closed for heating circuit x,
in combination with 9kxop
BufBt Lower cylinder temperature sensor in a buffer
cylinder
9kxop Heating circuit mixer is open for heating circuit x, in
combination with 9kxcl
BufBtDHW Bottom cylinder temperature sensor for domestic
hot water generation in a buffer cylinder (MSS)
3fx Heating pump for heating circuit x
BufBtHC Top cylinder temperature sensor for the heating
circuit in a buffer cylinder (MSS)
3h Anti-legionella pump
BufTopDHW Top cylinder temperature sensor for domestic hot
water generation in a buffer cylinder (MSS)
LP/9e Charging pump or domestic hot water generation
prioritising diverter valve
BufTopHC Bottom cylinder temperature sensor for the heating
circuit in a buffer cylinder (MSS)
MA Multi-function output
COL Collector temperature sensor PWM Control signal for the solar pump station or the
feedback signal
COLP Solar pump SysFlow System flow temperature (e.g. in low loss header)
CP Circulation pump TD2 Temperature difference sensor 2
DEMx Input for external heat demand for heating circuit x 9g Diverter valve
DHW1 Cylinder temperature sensor ZoneOff 2-way valve for switching between zones, in com-
bination with Zone On
DHWBH Cylinder temperature sensor for the back-up boiler ZoneOn 2-way valve for switching between zones, in com-
bination with Zone Off
DHWBt Lower cylinder temperature sensor 9bx Zone valve for Zone x
DHWoff 2-way valve for switching to cylinder, in combina-
tion with DHWon
Solar Yield Sensor for the solar yield, installed in the solar
circuit return. TD is used to calculate the solar
yield between the collector and return sensor
DHWon 2-way valve for switching to cylinder, in combina-
tion with DHWoff
eyield Sensor for more precise solar yield, installed in the
solar circuit flow. TD is used to calculate the solar
yield between the flow and return
C.2 Connecting the actuators and sensors to VR 70
Set value R1 R2 R3/R4 R5/R6 S1 S2 S3 S4 S5 S6 S7
1 3f1 3f2 MA 9k2op/
9k2cl
DHW1/
BufBt
DEM1 DEM2 SysFlow FS2
3 MA 3f2 LP/9e 9k2op/
9k2cl
BufTop
DHW
BufBt
DHW
BufBt
HC
SysFlow BufTop
HC
FS2
5 3f1 3f2 9k1op/
9k1cl
9k2op/
9k2cl
SysFlow DEM1 DEM2 FS1 FS2
6 COLP 3h MA 9b1 DHW1 DHWBt SysFlow COL Solar
Yield
PWM
12 COLP 3f1 9g/9e 9k1op/
9k1cl
Solar
Yield
DHWBt TD1 TD2 COL FS1 PWM
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