Operating and display functions 8
13
A
B
C
D
18
22
20
0.4
70
60
50
40
30
15
10
5
0
-5
-10
-15
-20
A
Outside temperature °C
B
Target flow temperature
°C
C
Target room temperat-
ure °C
D
Axis a
If the heating curve 0.4 is selected and 21 °C is specified for
the target room temperature, the heating curve is then trans-
lated, as shown in the figure. The heating curve is displaced
according to the value of the room target temperature along
axis a which is angled at 45°. At an outside temperature of
-15 °C, the control system provides a flow temperature of
45 °C.
8.6.16 Activating room temperature control
Menu
→
Installer level
→
System configuration
→
[
HEAT-
ING1
----]
→
Room temp. mod.
–
This function allows you to define whether the temper-
ature sensor integrated in the controller or in the remote
control unit should also be used.
The prerequisite for this is:
–
The controller is installed in the living room.
–
Any
VR 91
remote control unit that is present has been
installed in the living room.
–
In the
Zone assignment
function, the controller or, if
required, the
VR 91
remote control unit is assigned to the
zone in which the controller or
VR 91
remote control unit
is installed. If you do not assign any zones, the
Room
temp. mod.
function is ineffective.
None
: Temperature sensor is not used for control.
Temp. mod.
: The built-in temperature sensor measures the
current room temperature in the reference room. This value
is compared with the target room temperature and, if there
is a difference, results in adjustment of the flow temperature
by means of the so-called "Effective target room temperat-
ure". Effective room temp. target = set room temp.
(set room temp. target - measured room temp. target). The
effective target room temperature is then used for controlling
instead of the set target room temperature.
Thermost.
: Works in the same way as temperature control,
however the zone is also switched off when the measured
room temperature is + 3/16 K greater than the set target
room temperature. When the room temperature falls + 2/16
K back below the target room temperature set, the zone is
switched on again. The use of room thermostat control, in
combination with careful selection of the heating curve, leads
to optimum control of the heating installation.
8.6.17 Activating "Cooling possible"
Menu
→
Installer level
→
System configuration
→
[
HEAT-
ING1
----]
→
Cooling possible
–
If a heat pump is connected, you can use the heating
circuit to activate the
Cooling
function.
8.6.18 Activating the dew point monitoring
Menu
→
Installer level
→
System configuration
→
[
HEAT-
ING1
----]
→
Dew point monitoring
–
You can use this function to activate the dew point monit-
oring.
If the dew point monitoring has been activated, the controller
compares the set minimum cooling target flow value with the
dew point+offset. The controller always selects the higher
temperature so that no condensate can form.
8.6.19 Setting the end cooling temperature
Menu
→
Installer level
→
System configuration
→
[
HEAT-
ING1
----]
→
End OT cooling
–
You can use this function to set the temperature
threshold from which cooling switches off. If the outside
temperature is lower than the temperature threshold set,
the controller ends cooling mode.
8.6.20 Setting the dew point offset
Menu
→
Installer level
→
System configuration
→
[
HEAT-
ING1
----]
→
Offset dew point
–
You can use this function to set the dew point offset.
The offset is a safety margin that is added to the dew point.
The controller selects the maximum for the flow temperature
calculated from the flow temperature that is set and the dew
point + offset.
8.6.21 Reading the status of the external heat
demand
Menu
→
Installer level
→
System configuration
→
[
HEAT-
ING1
----]
→
Status ext. heat dem.
–
You can use this function to read the status on the ex-
ternal input to see whether there is a heat demand.
Depending on the configuration of the
VR 70
or
VR 71
, there
is one external input for each heating circuit. You can con-
nect an external zone controller, for example, to this external
input.
8.6.22 Reading the heating pump status
Menu
→
Installer level
→
System configuration
→
[
HEAT-
ING1
----]
→
Pump status
–
You can use this function to read the current status (
On
,
Off
) of the heating pump for the heating circuit.
8.6.23 Reading the status of the heating circuit
mixer
Menu
→
Installer level
→
System configuration
→
[
HEAT-
ING2
----]
→
Mixer status
–
You can use this function to read the current status
(
Opening
,
Closing
,
Stationary
) of the heating circuit
mixer for
HEATING2
.
0020200781_01
VR
C
700/2
Installation instructions
