Vaillant VR 90 Specification sheet

For heating engineer/owner
Operating and Installation Manual
VR 90 Remote control unit
Bus-modular control system VR 90
GB

For the operator
Operating manual
VR 90 Remote control unit
VR 90
Bus–modular control system
Contents
1 Notes on the documentation.........................2
1.1 Other applicable documents ................................2
1.2 Storing the documents..........................................2
1.3 Symbols used ...........................................................2
1.4 Applicability of the manual...................................2
1.5 CE mark .....................................................................2
2 Description of the device...............................2
2.1 Intended use.............................................................2
3 Operation .........................................................3
3.1 Overview of operation...........................................3
3.2 Operating procedure..............................................3
3.3 Display types............................................................3
3.3.1 Basic display.............................................................3
3.3.2 Sample display in the Menu level........................3
3.3.3 Sample display in the Code level ........................4
3.4 Knobs .........................................................................4
3.5 Operator guidance..................................................4
3.5.1 Menu selection.........................................................4
3.5.2 Tables for the menu level.....................................4
3.5.3 Special functions.....................................................7
4 Error messages............................................... 7
5 Warranty and customer service ...................7
5.1 Vaillant warranty.....................................................7
5.2 Vaillant Service........................................................7

Operating manual for remote control unit VR 90 0020055329_012
1 Notes on the documentation
The following instructions are intended to help you
throughout the entire documentation.
Further documents apply in combination with this oper-
ating and installation manual.
We accept no liability for any damage caused by non–
observe these instructions.
1.1 Other applicable documents
For the operator
When operating the system, the individual operating
manuals for the various components in the installation
must be observed.
For the heating engineer:
When installing the remote control unit, observe the in-
stallation instructions for all the assemblies and compo-
nents in the system.
These installation instructions are included with the in-
dividual assemblies in the system and the additional
components.
1.2 Storing the documents
Please keep this operating manual and all other applica-
ble documents in good condition, so that they are avail-
able when required.
1.3 Symbols used
Please observe the safety instructions in this manual
when using the device!
dDanger!
Immediate risk of serious injury or death!
eDanger!
Danger of death by electric shock!
HDanger!
Danger of burning and scalding!
aCaution!
Potentially dangerous situation for the product
and environment!
hNote!
Useful information and instructions.
• Symbol for a necessary task
1.4 Applicability of the manual
This operating manual applies exclusively to units with
the following part numbers:
– 0020040079
– 0020040080
– 0020045456.
The type designation for your unit can be found on the
identification plate.
1.5 CE mark
CE labelling shows that the appliances according to the
model overview comply with the basic requirements of
the applicable directives.
2 Description of the device
The VR 90 remote control unit is used for the individual
setting of a heating circuit within a heating system with
auroMATIC 620, VRC 630 or geoTHERM. Independent of
the use of this remote control device, all settings for
this heating circuit can be carried out using the central
controller.
Please note that only the following numbers of remote
control devices may be fitted in a control system to en-
sure the correct supply voltage to the system:
– auroMATIC 620 – maximum of 7 remote control units
– VRC 630 – maximum of 8 remote control units
– geoTHERM – maximum of 6 remote control units
2.1 Intended use
The VR 90 remote control device is a state–of–the–art
appliance which has been manufactured in accordance
with recognised safety regulations.
Nevertheless, there is a risk of death or serious injury to
the user or others or of damage to the unit and other
property in the event of improper use or use for which it
is not intended.
The VR 90 remote control unit is a system component
of the auroMATIC 620 and VRC 630 modular bus con-
trol system or the geoTHERM heat pump, used for con-
trolling hot water central heating installations with inte-
grated hot water generation.
Any other or extended use is considered to be improper.
The manufacturer/supplier is not liable for any resulting
damage. The user alone bears the risk.
Intended use also includes observing the operating and
installation instructions and all other applicable docu-
ments, as well as complying with the inspection and
servicing conditions.
aCaution!
Any misuse is forbidden.
1 Notes on the documentation1 Notes on the documentation
2 Description of the device

3Operating and installation manual for remote control unit VR 90 0020055329_01
3 Operation
All adjustments that need to be made for the connected
heating circuit can be carried out using the VR 90 re-
mote control device. It is equipped with a graphic dis-
play for this purpose.
For ease of operation plain text is used. You can change
the display language, if necessary.
3.1 Overview of operation
HK1
Heating circuit parameter
Set-back temperature
Heating curve
Target room temperature
2
1
3
4
5
Fig. 3.1 Overview of operation
Key
1 Menu name
2 Cursor indicating the selected parameter
3 Menu number
4 knob,
Set parameter (turn), Select parameter (press)
5 knob,
Select menu (turn), Activate special function (press)
3.2 Operating procedure
User level
Turn the knob to select the menu
Press the knob to select the parameter to be
changed
Turn the knob to change the selected para-
meter
Special functions
Only possible in the basic display (Saving, Party)
Press the knob,
up to 2x
to select the special function
Press the knob to select the changed parame-
ter and to accept the selected
parameter value (after chang-
ing by turning)
Turn the knob to set the desired value (only
necessary for Saving)
Press the knob to end the special function
3.3 Display types
3.3.1 Basic display
Fri 17.05.02 15:37 – 15 °C
Room temperature 21 °C
Operating mode
HK1
Heating > Auto 20 °C
Cooling Auto
VR 90
The display shows the current operating modes for
heating and cooling and the target room temperature
for the connected heating circuit. The target room tem-
perature applies to both heating and cooling. The mode
and the target room temperature can be changed here.
hNote!
The "Cooling" function is only available in con-
junction with a geoTHERM that supports a
cooling function.
3.3.2 Sample display in the Menu level
HK1 1
Heating parameters
Set–back
temperature > 15 °C
Heating curve 1,2
> Select target room temperature
User–specific settings.
Operation 3

Operating manual for remote control unit VR 90 0020055329_014
3.3.3 Sample display in the Code level
HK1 C2
Parameters
Minimum temperature > 15 °C
Maximum temperature 90 °C
Max. preheating 0 min
> Select flow temperature
System–specific settings to be made only by the heating
engineer.
The VR 90 display varies, depending on the selection
(basic display, menu displays, displays on the code
level).
The current operating state and target room tempera-
ture for the heating circuit are shown in the basic dis-
play. You can also change these settings in the basic
display. The possible displays are shown as examples in
the list (see Section 3.3).
You can go to the menu displays, where settings rele-
vant to the user, such as heating times, set–back tem-
peratures and heating curves can be accessed, by turn-
ing the left–hand knob. These menus are identified
with a number at the top right of the display (see
Fig. 3.1). The numbers make it easier to find individual
menus during programming.
You can go to the Code level by turning the knob fur-
ther.
The code level should only be accessed by the heating
engineer because of the types of parameters which are
displayed. A password is required to access the code to
protect the system from accidental changes to the set-
tings.
The following parameters can be displayed in the indi-
vidual menus, but cannot be changed if no password is
entered, i. e. access to the code level is disabled. This
level is indicated by numbers with a prefix C (C1, C2,
C3, ...).
Furthermore it is possible to display and select special
functions, such as the energy saving function and heat-
ing engineer–specific service functions. The required op-
erating procedure is described in Section 3.2.
3.4 Knobs
All the programming of the remote control unit is car-
ried out using only two knobs ( and , see Section 3.1).
The knob is used to select the parameter (by turning
and then pressing) and to adjust the parameter (by
turning).
The knob is used to select the menu (by turning) and
to activate special functions (by pressing).
3.5 Operator guidance
The operating principle is based on the Vaillant "click
and turn" operating concept as well as a plain text dis-
play for the unambiguous identification of the program-
ming performed. Sections 3.1 and 3.2 show the basic
structure of the display and the operating procedure for
the user or heating engineer.
The required operating steps are described in the fol-
lowing. You can read off which menu you should select
from Table 3.1 to display or adjust the required parame-
ter.
3.5.1 Menu selection
The first menu you see is the basic display on which the
current operating modes and the target room tempera-
ture of the heating circuit are displayed.
You can move the cursor to the desired parameter by
turning the knob. The cursor only goes to parameters
which can be changed on this menu display. At the same
time the changes which can be made by turning the
knob, e.g "Select operating mode", appear in the line.
Select change in the parameter by pressing the knob.
The parameter is changed immediately when you turn
the knob and the changed value appears immediately
on the display of the controller and confirmed by press-
ing the knob.
3.5.2 Tables for the menu level
To adjust the parameters, proceed according to the de-
scription in 3.5.1. The editable parameters are displayed
in Table 3.1 on a grey background for clarity. Explana-
tions of the parameters can be found immediately be-
side the individual display images or in Section 6 of the
Installation Manual, "Overview of Functions".
3 Operation

5Operating and installation manual for remote control unit VR 90 0020055329_01
Displayed menu Explanation and setting options
Fri 17.05.02 15:37 – 15 °C
Room temperature 21 °C
Operating modes
HK1
Heating > Auto 20 °C
Cooling Auto
> Select mode
The following information is displayed on the basic display: the current date and
time, the outside temperature (if room modulation is activated), the current room
temperature, the current operating mode and the target room temperature. Each
heating circuit or hot water circuit is controlled separately according to the operat-
ing mode.
The "Cooling" line only appears in conjunction with a geoTHERM that supports a
cooling function.
The following modes are valid for the Heating parameter:
Auto The selected circuit is operated automatically between the desired set
point and set back temperatures according to the on and off time pro-
grammes.
Eco The selected circuit is operated automatically between the desired set
point and Off according to the on and off time programmes. In this
case the heating circuit is completely switched off during the set–back
period, provided the frost protection function (dependent on the out-
side temperature) is not active.
On The selected circuit operates continuously "On" at the desired "On"
temperature set point, regardless of the programmed times.
Energy
save The selected circuit operates continuously "On" at the desired "Off/ setback" temperature set point, regardless of the programme times.
Off The selected circuit is not heated, except for when frost protection
(dependent on the outside temperature)is activated.
The following modes are valid for the Cooling parameter:
Auto The selected circuit is operated automatically between the On (cooling)
and Off modes according to the preset timer programme.
On The selected circuit is regulated at the cooling mode flow temperature,
independently of any timer programme.
Off The selected circuit is not cooled.
Flow temperature
in ºC
Heating curves
Outside temperature in ºC
A further adjustable parameter is the target room temperature, which can also be
set separately for each heating circuit. The target room temperature is taken into
account for the calculation of the heating curve. Increasing the target room tem-
perature moves the heating curve parallel on a 45° axis and the flow temperature
is accordingly adjusted by the control. The diagram on the left shows the relation
between the target room temperature and the heating curve.
HK1 1
Heating parameters
Set–back temperature > 15 °C
Heating curve 0,90
> Select target room temperature
The following apply for heating mode:
The set–back temperature and heating curve parameters can be set on the
heating circuit parameter display.
The set–back temperature is the temperature to which the heating is regulated
during the set–back period.
Table 3.1 Settable parameters
Operation 3

Operating manual for remote control unit VR 90 0020055329_016
Displayed menu Explanation and setting options
HK1 2
Cooling parameters
Max. limit outs.
temp > 21 °C
ØAT 24h cooling start 24 °C
ØAT 24h current 18 °C
> Select
The following apply for cooling mode with geoTHERM:
Maximum limit outside temperature: Temperature limit for shutting off heating
mode (summer function).
ØAT 24h cooling start: Is the average outside temperature at which the cooling is
activated.
Both a Maximum limit outside temperature and an ØAT 24h cooling start can be
set for each heating circuit.
ØAT 24h cooling current: Display of the currently calculated 24–hour average
outside temperature.
HK1 3
Timer programme
> Mon–Fri
1 08:00 – 14:00
2 16:00 – 22:00
3–
> Select target room temperature
You can set the heating times for the heating circuit in the "Time programme"
display. Up to three heating times can be programmed per day or block. The con-
trol system operates according to the heating curve and the target room tempera-
ture. The heating circuit has a standard basic programme. The basic programme
can be found in the documentation for the particular main controller (VRS 620,
VRC 630 or geoTHERM).
HK1 3
Cooling timer programme
> Mon–Fri
1 08:00 – 14:00
2 16:00 – 22:00
3–
> Select target room temperature
The following apply for cooling mode with geoTHERM:
You can set the cooling times for the heating circuit in the "Timer programme" dis-
play. Up to three cooling times can be programmed per day or block. The tempera-
ture is controlled at the target value set for the room. The heating circuit has a
standard basic programme. The basic programme can be found in the documenta-
tion for the particular main controller (VRS 620, VRC 630 or geoTHERM).
Holiday programming 4
for HK1
Periods
1 > 18.07.03 – 31.07.03
2 26.09.03 – 05.10.03
Target temperature 15 °C
> Select start day
It is possible to programme the heating circuit for two holiday time periods with
date entry.
In addition, here you can adjust the desired set–back temperature i.e. the value of
the heating circuit to which it should be set during the time of absence. After the
holiday time has elapsed, the controller automatically reverts to the previous oper-
ating mode. The holiday programme can be activated only in auto and eco mode.
Flow temperature
in ºC
Heating curves
Outside temperature in ºC
The heating curve depicts the relationship between the outside temperature and
the flow temperature for heating operation. The room temperature of your system
depends to a great extent on the selection of the right heating curve. If the select-
ed heating curve is too high, the temperatures in the system will also be too high,
resulting in higher energy consumption. If the selected heating curve is too low,
the desired temperature level may only be reached after a while or not reached at
all.
Code level 8
enabling
Code number:
> 0 0 0 0
Standard Code:
1 0 0 0
> Adjust numeric character
The last display of the user level is the entry of the code for the installer level. This
level is protected against accidental changes by an access code, since the settings
there should be made only by the engineer.
To view setting parameters without entering the code, you must press the knob
once. You can then view all parameters of the code level by turning the knob but
not change them.
In the entire control system there is only one Code which can, if required, be
changed in the central controller.
Table 3.1 Settable parameters (continued)
3 Operation

7Operating and installation manual for remote control unit VR 90 0020055329_01
3.5.3 Special functions
Special functions can be selected only from the basic
display. To do so, press the knob. The following special
functions can be selected:
Energy saving function
Fri 17.05.02 15:37 – 15 °C
Room temperature 21 °C
Energy saving
enabled
until >18:30
VR 90
Press the knob 1 x. The Energy saving function allows
you to lower the temperature for an adjustable period
during the heating times.
In addition, you must enter the time of day up to which
the Saving function (setting to set–back temperature) is
to be applicable. In order to set the time, push the
knob and select the desired time (Hour:Minute) by turn-
ing. Push the knob again to accept the value.
Party function:
Fri 17.05.02 15:37 – 15 °C
Room temperature 21 °C
Party function
enabled
Press the knob 2 x.
The Party function allows you to continue the heating
time beyond the next switch–off time up to the next
heating start.
After 5 seconds the display reverts to the basic display.
After the function ends (time expired) or if the knob is
pushed again, the basic display shows the original oper-
ating mode of the heating circuit again.
4 Error messages
Error messages are displayed on the central controller
in the event of malfunctions to the system. They are dis-
played in plain text.
Please call your engineer for troubleshooting. The tele-
phone number will be displayed if the engineer has pro-
grammed it.
5 Warranty and customer service
5.1 Vaillant warranty
We only grant a Vaillant manufacturers warranty if a
suitably qualified engineer has installed the system in
accordance with Vaillant instructions. The system owner
will be granted a warranty in accordance with the
Vaillant terms and conditions. All requests for work
during the guarantee period must be made to Vaillant
Service Solutions (0870 6060 777).
5.2 Vaillant Service
To ensure regular servicing, it is strongly recommended
that arrangements are made for a Maintenance Agree-
ment. Please contact Vaillant Service Solutions
(0870 6060 777) for further details.
Operation 3
Error messages 4
Warranty and customer service 5

For the heating engineer
Installation instructions
VR 90 Remote control device
VR 90
Bus–modular control system
Contents
1 Notes on the documentation.........................2
1.1 Other applicable documents ................................2
1.2 Storing the documents..........................................2
1.3 Applicability of the manual...................................2
1.4 CE mark .....................................................................2
1.5 Intended use.............................................................2
2 Safety instructions and regulations ............3
2.1 Safety instructions .................................................3
2.2 Regulations...............................................................3
3 Installation.......................................................3
3.1 Installation location................................................3
3.2 Installing the remote control ...............................3
4 Electrical installation.....................................4
4.1 Connecting the remote control...........................4
4.2 Setting the Bus address ........................................5
5 Start–up ...........................................................5
5.1 Setting heating circuit parameters ....................5
5.2 Handing over the control to the owner.............7
6 Overview of functions ....................................8
7 Technical data.................................................11
8 Warranty and customer service ................. 12
8.1 Vaillant warranty....................................................12
8.2 Vaillant Service.......................................................12
9 Recycling and disposal................................. 12

Installation manual Remote control unit VR 90 0020055329_012
1 Notes on the documentation
These installation instructions are intended for the heat-
ing engineer.
The following notes are intended to guide you through
the documentation. Further documents apply in combi-
nation with these installation instructions. We accept no
liability for any damage caused by non–observe these
instructions.
1.1 Other applicable documents
When installing the VR 90 remote control unit, observe
the installation instructions for all assemblies and com-
ponents of the system, e.g., auroMATIC 620,
calorMATIC 630 or geoTHERM. These installation in-
structions are included with the individual assemblies in
the system and the additional components.
For the operator
When operating the system, the individual operating
manuals for the various components in the installation
must be observed.
For the heating engineer:
When installing the remote control unit, observe the in-
stallation instructions for all the assemblies and compo-
nents in the system.
These installation instructions are included with the in-
dividual assemblies in the system and the additional
components.
1.2 Storing the documents
Pass these installation instructions and all other applica-
ble documents and, if necessary, any required aids to
the system operator. He will be responsible for storing
them so that the instructions and aids are available
when required.
1.3 Symbols used
Please observe the safety instructions in this installa-
tion manual when installing the device!
dDanger!
Immediate risk of serious injury or death!
eDanger!
Danger of death by electric shock!
HDanger!
Danger of burning and scalding!
aCaution!
Potentially dangerous situation for the product
and environment!
hNote!
Useful information and instructions.
• Symbol for a necessary task
1.3 Applicability of the manual
These installation instructions apply exclusively to units
with the following part numbers:
– 0020040079
– 0020040080
– 0020045456
1.4 CE mark
The CE mark certifies that the VR 90 remote control
unit in conjunction with Vaillant boilers fulfils the basic
requirements of the following directives:
• Directive relating to electrical equipment designed for
use within certain voltage limits (2006/95/EWG)
• Directive relating to electromagnetic compatibility
(2004/108/EWG)
1.5 Intended use
The Vaillant VR 90 remote control unit is a state–of–
the–art appliance which has been manufactured in ac-
cordance with recognised safety regulations.
Nevertheless, there is a risk of death or serious injury to
the user or others or of damage to the device and other
property in the event of improper use or use for which
it is not intended.
The VR 90 remote control unit is a system component
of the auroMATIC 620 or VRC 630 modular bus control
system, used for controlling hot water central heating
installations with integrated hot water generation.
Please note that a maximum of 8 remote control devic-
es can be incorporated. The unit can also be combined
with the geoTHERM heat pump.
Any other or extended use is considered to be improper.
The manufacturer/supplier is not liable for any resulting
damage. The owner alone bears the risk.
Intended use also includes observing the operating and
installation instructions and all other applicable docu-
ments, as well as complying with the inspection and
servicing conditions.
aCaution!
Any misuse is forbidden.
1 Notes on the documentation

3Installation manual Remote control unit VR 90 0020055329_01
2 Safety instructions and regulations
The assembly, electrical connection and the settings in
the control as well as the commissioning must be car-
ried out only by a suitably qualified heating engineer!
At a glance: What you have to do to install the VR 90
remote control unit.
1. Preparation:
– Read the installation instructions.
– Check the scope of delivery.
2.Installation of the control:
– VR 90 remote control device
– Carry out the electrical installation.
The control must be installed by a qualified engineer,
who is responsible for adhering to the prevailing stand-
ards and regulations. We accept no liability for any dam-
age caused by failure to observe these instructions.
2.1 Safety instructions
eDanger!
Risk of fatal electric shock from touching live
connections.
Before carrying out work on the unit, switch off
the power supply and secure it against being
switched on again.
Only remove the control from the wall box or
from the plinth when it is potential free.
2.2 Regulations
The regulations of the power supply company must be
observed for the electrical installation.
Use standard cable for the wiring.
Minimum cross–section of the conductors: 0.75 mm2
The following maximum wire lengths may not be ex-
ceeded:
– Bus lines 300 m
Where lengths are greater than 10m, route the connec-
tion cables carrying 230V separately from the sensor or
bus cables.
The control must only be installed in dry rooms.
All wiring must be in accordance with Building Regula-
tions Part P and BS 7671 (IEE Wiring Regulations), and
must be carried out by a suitably qualified person.
3 Installation
The VR 90 can be installed on the wall in any room
which is included in the heating system.
3.1 Installation location
Please note that, when selecting the installation loca-
tion, you need to take into account whether room tem-
perature recording is required (selection of the control-
ling room).
If recording is required, the remote control device must
be installed in such a way that perfect recording of the
room temperature is ensured (avoiding stagnant heat,
not installed on a cold wall, etc.).
The best place for installation is usually on an inside
wall of the main living room at an approximate height of
1.5 m.
The remote control device should be able to record the
circulating air, unhindered by furniture, curtains or
other objects. Choose a location where the remote con-
trol device is not affected by draughts from doors or
windows, or by heat sources such as radiators, chimney
walls, television sets or direct sunlight. All radiator
valves must be fully open in the room in which the re-
mote control device is installed if room temperature
modulation is activated.
3.2 Installing the remote control
eDanger!
Risk of fatal electric shock through contact
with live connections!
Before carrying out work on the unit, switch off
the power supply and secure it against being
switched on again.
The connection to the boiler is via twin–core Bus cable
(eBus). Lay the electrical lines up to the boiler to your
advantage before installing the remote control device.
2
1
Fig. 3.1 Opening the remote control unit
Safety instructions and regulations 2
Installation 3

Installation manual Remote control unit VR 90 0020055329_014
• Switch off the power.
• Secure the power supply against being switched on
again.
• Open the unit (2) using a screwdriver in the two
notches (1) on the underside as shown in Fig. 3.1.
• Remove the housing cover.
• Drill two fixing holes (3), diameter 6 mm, as shown in
Fig. 3.2 and insert the supplied wall plugs.
• Guide the connection cable through the duct (4).
• Attach the wall plinth to the wall with the two screws
provided.
3
1
2
4
Fig. 3.2 Installation as a remote control device
• Connect the connecting cable as shown in Fig. 4.1.
• Place the remote control device (1) on the mounting
box so that the pins on the back of the top part fit into
the recesses (2).
• Push the remote control device onto the mounting
box until it engages.
• Switch the power on again.
4 Electrical installation
The electrical connection may only be carried out by a
suitably qualified heating engineer.
eDanger!
Risk of fatal electric shock through contact
with live connections!
Before carrying out work on the unit, switch off
the power supply and secure it against being
switched on again.
4.1 Connecting the remote control
The remote control device communicates with the cen-
tral controller via the eBus. They can be connected to
any interface in the system. It simply has to be ensured
that the bus interfaces are eventually connected to the
central controller.
The structure of the Vaillant system allows you to lay
the eBus from component to component. This means
that the wires can be swapped without impairing com-
munication.
rag 1xZP Tel BUS DCF/AF C1
2 1 2 1 2 - + DCF 0 AF C1
eBus
Fig. 4.1 Connecting the remote control
All eBus connector plugs are designed to allow you to
wire at least 2 x 0.75 mm2per connection terminal.
We therefore recommend using 2 x 0.75 mm2eBus
lines.
3 Installation
4 Electrical installation

5Installation manual Remote control unit VR 90 0020055329_01
4.2 Setting the Bus address
Communication within the system is by means of an
eBus. To ensure correct communication between all the
components, it is necessary to give the remote control
unit an address that suits the heating circuit being con-
trolled.
Correct addressing for the individual system compo-
nents can be seen in Table 4.1.
Fig. 4.2 Setting the Bus address
System component Address of the
component Bus address to be set in the VR 90
Heating circuit 1
auroMATIC 620/
VRC 630
1
Heating circuit 2
auroMATIC 620/
VRC 630/
geoTHERM VWL/VWS/VWW
2
Heating circuit 3
VRC 630
3
VR 60, Address 4 HC 4
HC 5
4
5
VR 60, Address 6 HC 6
HC 7
6
7
VR 60, Address 8 HC 8 8
Table 4.1 Bus addresses to be set
5 Start–up
Start–up is carried out in conjunction with the start–up
of the central controller. To do this, proceed in accord-
ance with the instructions in the manual for the
auroMATIC 620 or calorMATIC 630 main controller or
the geoTHERM heat pump.
5.1 Setting heating circuit parameters
Setting the heating circuit parameters takes place in the
Code level. You can also call up various system values
here. The code level is protected against unauthorised
access by a service code and is enabled for 60 minutes
after entering the right code.
You can access the code level by turning the knob on
the left until the "Code layer enabled" menu is reached.
In this menu you must enter the code which allows you
to change the following heating circuit parameters. If
you do not enter a Code the parameters in the following
menus are displayed, but you cannot change them. The
standard Code setting is 1 0 0 0.
It can only be changed on the central operating section
for the VRS 620/VRC 630 or geoTHERM.
The operation of the Code level is the same as that of
the user level. You can select the parameters also by
turning and pushing the knob.
All accessible Code menus and their parameters can be
seen in Table 5.1.
Table 5.1 lists all the menus accessible in the Code level,
together with the parameters or displayed values. The
editable parameters are displayed on a grey back-
ground.
Further information on the individual functions can be
found in the overview of functions in Section 7 of this
document.
Electrical installation 4
Start–up 5

Installation manual Remote control unit VR 90 0020055329_016
Displayed text Adjustable parameters Setting range Default setting
Basic data C1
Language selection
Language > GB English
> Select language
HK1 C2
Parameters
Type: Burner circuit
Set–back temperature > 15 °C
Switch–on room temperature none
Minimum temperature 15 °C
Maximum temperature 75 °C
Max. preheating 0 min
Flow temp. Target 55 °C
Flow temp. Actual 45 °C
Pump status
> Select
Set–back temperature
Switch–on room tempera-
ture
Minimum temperature
Maximum temperature
Max. pre–warm–up time
5 – 30 °C
none/room temp./thermostat
15 – 90 °C
15 – 90 °C
0 – 300 minutes
15 °C
none
15 °C
90 °C
0
HK2 – HK8 max. C2
Parameters
Type: Burner circuit
Set–back temperature > 15 °C
Switch–on room temperature none
Minimum temperature 15 °C
Maximum temperature 75 °C
Max. preheating 0 min
Flow temp. Target 55 °C
Flow temp. Actual 45 °C
Pump status
Mixer status Open
> Select
Set–back temperature
Switch–on room tempera-
ture
Minimum temperature
Maximum temperature
Max. pre–warm–up time
5 – 30 °C
none/room temp./thermostat
15 – 90 °C
15 – 90 °C
0 – 300 minutes
15 °C
none
15 °C
75 °C
0
Table 5.1 Settings in the Code level
5 Start–up

7Installation manual Remote control unit VR 90 0020055329_01
Displayed text Adjustable parameters Setting range Default setting
Tool C12
Temperature correction
Current room temperature > 0.0 K
Display contrast 16
> Select correction value
Temperature correction:
Current room tempera-
ture
Display contrast
–3 ... +3 K
0 – 25
O K
16
Software version C15
VR 90 01 1.05
Table 5.1 Settings in the Code level (continued)
5.2 Handing over the control to the owner
The user must be trained in the handling and function of
his control.
• Hand over the manuals and documents intended for
the owner.
• Go through the operating manual with the owner and
answer any questions.
• Draw special attention to the safety instructions which
the owner must follow.
• Tell the owner to keep the manuals nearby the con-
trol.
Start–up 5

Installation manual Remote control unit VR 90 0020055329_018
6 Overview of functions
Function Meaning / Explanation
Set–back temperature The set–back temperature is the temperature to which the heating is regulated
during the set–back period. It can be set separately for each heating circuit.
Maximum limit outside temperature The maximum limit outside temperature is the outside temperature value at which the
weather compensated heating shutdown (automatic shutdown in summer) takes ef-
fect.
The Maximum limit outside temperature can be set independently for each heating
circuit.
ØAT 24h cooling start These parameters are only displayed on systems with a cooling function (geoTHERM).
ØAT 24h cooling start: Is the average outside temperature at which the cooling is
activated.
Both a Maximum limit outside temperature and an ØAT 24h cooling start can be set
for each heating circuit.
ØAT 24h cooling current: Display of the currently calculated 24–hour average out-
side temperature.
The control system demands outside temperature dependent heating or cooling for
the heating circuit.
In heating mode, the current outside temperature in conjunction with the preset max.
limit outside temperature is taken into account, as described for the "Max. limit out-
side temp." function in this table.
In cooling mode, it is the 24–hour average of the outside temperature that is relevant.
If the 24–hour average of the outside temperature (ØAT 24h cooling current) is
above the preset cooling start temperature (ØAT 24h cooling start), cooling is re-
quested.
T
t
AT - Abschaltgrenze
ØAT 24h Kühlen Start
ØAT 24h Kühlen aktuell
Aktuelle Außentemperatur
T
t
AT -Maximum limit
outside temperature
ØAT 24h cooling start
ØAT 24h cooling current
Current outside temperature
To prevent switching between heating and cooling too quickly, the changeover from
heating to cooling and vice versa always takes place with an intervening wait period.
Neither heating nor cooling occurs during the wait period.
The wait period for the changeover from heating to cooling is at least 6 hours. For the
changeover from cooling to heating, the wait period is at least 12 hours.
Note:
– If both the condition for heating, by virtue of the current outside temperature, and
the condition for cooling, by virtue of the 24-hour average outside temperature are
met, the requirement for heating takes priority.
– If a remote control unit is in use, the wait period for the changeover from heating
to cooling can be reduced as a result of the influence of the room temperature. Too
soon a changeover to heating by virtue of the outside temperature is likewise pre-
vented provided the room is still warm. See more about this in the description of
the "Switch on room temp. (systems with cooling function)" function in this table.
ØAT 24h cooling current:
Table 6.1 Overview of functions
6 Overview of functions

9Installation manual Remote control unit VR 90 0020055329_01
Function Meaning / Explanation
Cooling parameters For more information, see:
– ØAT 24h cooling start
– ØAT 24h current
Flow temperature
in ºC
Heating curves
Outside temperature in ºC
The heating curve represents the relation between the outside temperature and tar-
get flow temperature. The setting is made separately for each heating circuit.
Maximum preheating With this function the activation of the heating circuit before the heating window is
made possible, with the aim of accessing the set day value at the beginning of the
heating window. The function is only performed for the first heating window of the
day. The beginning of heating is established, depending on the outside temperature:
Preheating period setting parameter: 0 ... 300 minutes, basic value 0
Influence of outside temperature: Outside temp. ≤–20 °C: set preheating period
Outside temp. ≥+20 °C: no preheating period
The period of time is calculated linearly between the two reference values.
If the preheating has been started it is only ended when the time window is completed
(no ending if, in the meantime, the outside temperature increases).
Maximum temperature of heating circuit The calculated target flow temperature for the heating circuit is limited to this value.
Minimum temperature of heating circuit This value represents the minimum value for the target flow temperature. Any time a
target value > 0 is calculated for the heating circuit, the value set here will be the min-
imum value specified.
Mixer status Activation of the mixer.
Open
Closed
Off
= mixer opens
= mixer closes
= mixer remains in its current position
Switch–on room temp. (systems without cooling
function) The switch–on room temperature is used to include the current room temperature in a reference room in the calculation of the flow temperature. When the function is ac-
tive, the room sensor in this VR 90 is used.
Table 6.1 Overview of functions (continued)
Overview of functions 6

Installation manual Remote control unit VR 90 0020055329_0110
Function Meaning / Explanation
Switch–on room temp. (systems with cooling
function) None: The measured room temperature has no influence on heating or cooling opera- tion.
Thermostat: In heating mode, the heating curve is displaced according to the differ-
ence between the measured and the desired room temperature. Thus the target flow
temperature for the corresponding circuit is increased or reduced, taking the current
outside temperature into account, in order to achieve a temperature change in the re-
quired direction in the room. Furthermore, heating is stopped when the measured
room temperature is more than 1 K above the current target room temperature.
The heating mode is started again when the measured room temperature falls below
the current target room temperature.
Cooling mode is requested when the room temperature rises more than 3 °C above
the daytime target temperature for the room.
Cooling is stopped when the measured room temperature is less than 2 °C (1 K hyster-
esis) above the daytime target temperature for the room. The previously mentioned
3 °C for the requirement for cooling can be increased to up to 5 °C via remote access.
The hysteresis can not be changed.
To prevent a cooling requirement by virtue of the measured room temperature, e.g., if
a fireplace is used in winter, this is disabled if the 24–hour average outside tempera-
ture is more than 5 K below the preset "ØAT 24h cooling start" limit.
The following graphic shows the limits for a heating or cooling demand resulting from
the room temperature:
T
t
Raumsollwert
Abschaltgrenze Kühlen
(Hysterese von 1K)
Raumtemperatur
Raumsollwert+ 3°C Einschaltgrenze Kühlen
Abschaltgrenze Heizen
(Hysterese von 1K)
Einschaltgrenze Heizen
T
t
Target room temperature
Room temperature
Target room temperature + 3 °C
Switch-off limit for heating
(Hysteresis 1K)
Switch-on limit for heating
Switch-off limit for cooling
(Hysteresis 1K)
Switch-on limit for cooling
The request from the measured room temperature (heating or cooling or no require-
ment) is balanced against the request resulting from the measured outside tempera-
ture and its 24–hour average.
The following applies here:
– If cooling is requested as a result of the room temperature under the conditions de-
scribed, this will also correspond to the overall requirement for this heating circuit.
– If there is no requirement resulting from the room temperature present, there will
be no heating but cooling will take place provided this is required as a result of the
outside temperature or its average value.
– If heating is requested as a result of the room temperature under the conditions de-
scribed, this will only correspond to the overall requirement for the circuit if there is
also a heating requirement due to the outside temperature present.
Note also the wait periods when changing between outside temperature dependent
heating and cooling requirements.
Current room temperature correction The measured value of room temperature can, if required, be adjusted upwards or
downwards by +/–3 °C.
Target inlet temperature Represents the inlet temperature in a heating circuit calculated by the controller on
the basis of the pre–set parameters.
Actual inlet temperature The actual inlet temperature in a heating circuit.
Table 6.1 Overview of functions (continued)
6 Overview of functions