4
Operating instructions 0020262548_01
2
Notes on the documentation
2.1
Observing other applicable documents
▶
Always observe all operating instructions enclosed with
the installation components.
2.2
Storing documents
▶
Store these instructions and all other applicable docu-
ments for further use.
2.3
Validity of the instructions
These instructions apply only to:
VRC 700/6
–
article number
Great Britain
0020184838
2.4
Nomenclature
The following terms are used for simplification:
–
System control: This refers to the
VRC 700
system con-
trol.
–
Remote control: If this refers to the
VR 91
remote control.
2.5
Function availability
The functions described in these operating instructions are
not available for all system configurations.
The system control only shows the functions that are avail-
able in the system configuration you have installed.
3
Product description
3.1
Product design
1
2
3
4
5
6
5
1
Display
2
Wall base
3
Diagnostics socket
4
Wall base cover
5
Selection button
6
Rotary knob
3.2
Main function
The system control is a weather-compensated system con-
trol with an outdoor temperature sensor installed in the open
air.
The system control is connected to the outdoor temperat-
ure sensor and the heat generator. The system control con-
trols the heating installation and other connected compon-
ents, e.g. the domestic hot water generation for a connected
domestic hot water cylinder or the ventilation of a connected
ventilation unit.
3.2.1
Heating
The outdoor temperature sensor measures the outdoor
temperature and forwards the values to the system control.
When the outdoor temperature is low, the system control in-
creases the flow temperature of the heating installation. If the
outdoor temperature increases, the system control reduces
the flow temperature. The system control responds to the
fluctuations in the outdoor temperature and uses the flow
temperature to ensure that the room temperature remains at
the desired temperature.
3.2.2
Cooling
The room temperature sensor measures the room temper-
ature and sends the data to the system control. If the room
temperature is higher than the desired temperature that is
set, the system control switches cooling on.
3.2.3
Ventilation
Using a controlled exchange of air, the ventilation unit en-
sures that the living rooms are ventilated and aerated. The
system control controls the air volume flow via the ventilation
levels that are set.
3.2.4
Domestic hot water generation
A temperature sensor measures the temperature of the wa-
ter in the domestic hot water cylinder and forwards the val-
ues to the system control. If the temperature lies below the
set value, the system control increases the temperature in
the domestic hot water circuit and therefore heats up the wa-
ter to the set domestic hot water temperature.
3.2.5
Circulation
The secondary return pipe is connected to the domestic hot
water pipe and forms a circuit with the domestic hot water
cylinder. The circulation pump pumps the domestic hot water
through the domestic hot water pipe, either continuously or
on a time-controlled basis. This means that domestic hot
water is available at the draw-off points.
3.3
Zones
A building is divided into several zones if the heat demand
differs between different sections of the building.
–
If underfloor heating and radiator heating are installed in
a house.
–
If a house contains more than one independent residen-
tial unit.
If more than one zone is available, the system control con-
trols the available zones.
