8 Operating and display functions
10
8.2.22 Reading the system flow temperature
Menu
→
Installer level
→
System configuration
[
System
--
--]
→
System flow temp.
–
You can use this function to read the current temperature
of the low loss header, for example.
8.2.23 Setting the offset for the buffer cylinder
Menu
→
Installer level
→
System configuration
[
System
--
--]
→
Offset.
–
If a heat pump is connected, you can use this function
to set an offset value (K) for the buffer cylinder for the
heating circuit.
The buffer cylinder is charged to the flow tempe the
set offset value when the
PV
entry is activated for the
Multi-
funct. input
function.
8.3
Configuring the system diagram
Each heating installation is based on a system diagram with
corresponding connection diagram. A separate system dia-
gram book contains the system diagram and the correspond-
ing connection diagrams with explanations.
System diagram book:
Great Britain
www.vaillant.co.uk
Document number
0020200783
8.3.1
Defining the system diagram
Menu
→
Installer level
→
System configuration
[
System
diagram configuration
----]
→
System diagram
–
You use this function to define the system diagram in the
controller.
The selected system diagram must match the heating install-
ation that is installed. The system diagram book contains the
possible system diagrams along with a system diagram num-
ber. You must enter the system diagram number in the con-
troller.
8.3.2
Configuring the VR 70
Menu
→
Installer level
→
System configuration
[
System
diagram configuration
----]
→
Config.: VR70, addr. 1
–
You can use this function to configure which inputs and
outputs you can use and which functions the inputs and
outputs have.
Each configuration has a unique set value that you must
enter in the
Config.: VR70 addr. 1
function. You can find
the set value and the terminal assignment for the selected
system diagram in the system diagram book.
Configuring the inputs and outputs of the
VR 70
(
→
Page 25)
8.3.3
Configuring the VR 70's multi-function
output
Menu
→
Installer level
→
System configuration
[
System
diagram configuration
----]
→
MA VR70, addr. 1
–
You can use this function to set which functions are to be
assigned to the multi-function output.
Configuring the inputs and outputs of the
VR 70
(
→
Page 25)
The
MA VR70, addr. 1
function does not appear on the
display if the system configuration is used to define the
functions of the multi-function output.
8.4
Additional module
8.4.1
Configuring the multi-function output
Menu
→
Installer level
→
System configuration
[
Add-on
module
----]
→
Multi-function output 2
–
You can use the multi-function output 2 to control the
circulation pump, dehumidifier or legionella protection
pump.
Depending on the system diagram specified, multi-function
output 2 is specified with a single function, or you can set a
function from a selection of two or three.
8.4.2
Setting the auxiliary heater output
Menu
→
Installer level
→
System configuration
[
Add-on
module
----]
→
Auxiliary boiler output
–
If you have connected an
aroTHERM
, you can use this
Aux. heater output
function. You can use this function
to set the level (max. output) at which the auxiliary heater
should work when heat is required.
You can operate the auxiliary heater at three different levels
(outputs).
8.4.3
Configuring the multi-function input
Menu
→
Installer level
→
System configuration
[
Addi-
tional module
----]
→
Multi-funct. input
–
If a heat pump is connected, you can use the
Multi-
funct. input
function. The controller requests the heat
pump's input for this purpose.
–
Input for the
aroTHERM
is: ME of the additional module
VWZ-AI
–
Input for the
flexoTHERM
is: X41, terminal in the func-
tional drawing
If there is a signal at the input of the heat pump, the following
functionalities are possible.
Not conn.
: The controller does not activate any functions.
The controller ignores the signal present.
Circ. boost
: The operator pressed the circulation button.
The controller activates the circulation pump for a short time
period.
PV
: The connected photovoltaic system generates surplus
current which is intended to be used for the heating install-
ation. The controller activates the
Cylinder boost
function
only once. If the signal at the input remains, the controller
activates the charging of the buffer cylinder in the heating cir-
cuit. The buffer cylinder is charged to the flow temperature
and an offset, see Setting the offset for the buffer cylinder
(
→
Page 10), until the signal at the input of the heat pump
falls again.
Installation instructions
VRC 700/2
0020200781_01
