Product Description 2; Which Nomenclature Is Used; What Is The Effect Of The Frost Protection Function; What Do The Following Temperatures Mean - Vaillant sensoCOMFORT VRC 720 Operating And Installation Instructions

2 Product description
2.1

Which nomenclature is used?

–
System control: Instead of VRC 720
–
Remote control: Instead of VR 92
–
FM3 or FM3 functional module: Instead of VR 70
–
FM5 or FM5 functional module: Instead of VR 71
2.2 What is the effect of the frost protection
function?
The frost protection function protects the heating installation
and flat from frost damage.
At outdoor temperatures
–
Below 4 °C for longer than four hours, the system control
switches the heat generator on and regulates the target
room temperature to at least 5 °C.
–
Above 4 °C, the system control does not switch the heat
generator on, but it monitors the outdoor temperature.
2.3

What do the following temperatures mean?

Desired temp. is the temperature to which you want to heat
up the living rooms.
Set-back temp. is the level below which the temperature
in the living rooms does not fall when outside of the time
periods.
Flow temp. is the temperature at which the heating water
leaves the heat generator.
2.4

What is a zone?

A building can be divided into multiple areas, which are
known as zones. A different requirement can be placed on
the heating installation in each zone.
Examples for dividing into zones:
–
Underfloor heating (zone 1) and panel radiator heating
(zone 2) are available in one building.
–
A building is made up of several self-contained residen-
tial units. Each residential unit has its own zone.
2.5

What is the circulation?

An additional water pipe is connected to the domestic hot
water pipe and forms a circuit with the domestic hot water
cylinder. A circulation pump facilitates the continuous circu-
lation of domestic hot water through the pipework system
which means that hot water is immediately available, even at
more distant draw-off points.
2.6

What is a fixed value control?

The system control regulates the flow temperature to two
fixed temperatures, which are independent from the room or
outdoor temperature. This control is suitable for a door air
curtain or swimming pool heating, for example.
0020287900_00 sensoCOMFORT Operating and installation instructions

Product description 2

2.7

What is meant by "time period"?

Example of heating mode in the mode: Time-controlled
B
24 °C
21 °C
16 °C
5
16:30 18:00
A Time
B Temperature
1 Desired temperature
2 Set-back temperature
You can divide a day up into several time periods (3) and (5).
Each time period can comprise an individual start time and
end time. The time periods must not overlap. You can assign
a different desired temperature (1) to each time period.
Example:
16:30 to 18:00; 21 °C
20:00 to 22:30; 24 °C
The system control regulates the living rooms to the desired
temperature within the time periods. In the times outside of
the time periods (4), the system control regulates the living
rooms to the lower set-back temperature (2) that is set.
2.8

What is the effect of the hybrid manager?

The hybrid manager calculates whether the heat pump or
the additional boiler covers the heat demand cost-effectively.
The decision-making criteria are the set tariffs in relation to
the heat demand.
To ensure that the heat pump and the additional boiler
can work effectively, you must enter the tariffs correctly.
See table SETTINGS menu item (→ Page 8). Otherwise,
increases costs may arise.
2.9

Preventing malfunctions

▶
Do not cover the system control with furniture, curtains or
other objects.
▶
If the system control is installed in the living room, open
all of the thermostatic radiator valves in this room fully.
4 3
20:00 22:30
3 Time period 2
4 Outside of the time
periods
5 Time period 1
1
2
A
3