Vaillant geoTHERM exclusive Operating Manual

For the owner

Operating manual

geoTHERM exclusive

Heat pump with integrated domestic hot water cylinder
and additional cooling function

VWS

GB

Contents

Contents

General information ..................................................... 3

Data badge .............................................................................. 3

1 Notes on this manual ....................................... 3

1.2 Document storage .................................................... 3

1.3 Symbols used ............................................................. 4

1.4 Applicability of the manual ..................................... 4

2 Safety instructions .......................................... 4

2.1 Coolant ......................................................................... 4

2.2 Prohibition on alterations ....................................... 5

3 Information on installation and operation ..... 5

3.1 Intended use ............................................................... 5

3.2 Requirements of the installation site .................. 6

3.3 Cleaning and care .................................................... 6

3.4 Checking the operating condition of the heat

pump ............................................................................. 6

3.4.1 Filling pressure of the heating installation ......... 6

3.4.2 Filling level and filling pressure of the brine

circuit ........................................................................... 6

3.4.3 Accumulation of condensate (condensation

water) ........................................................................... 7

3.5 Energy saving tips .................................................... 7

3.5.1 General energy saving tips ..................................... 7

3.5.2 Economising by the correct use of the control

system .......................................................................... 7

3.6 Recycling and disposal ............................................ 8

3.6.1 Appliance ..................................................................... 8

3.6.2 Packaging .................................................................... 8

3.6.3 Coolant ......................................................................... 8

5.10 Troubleshooting and Diagnosis ............................. 25

5.10.1 Error messages on the Controller ........................ 25

5.10.2 Activating emergency mode .................................. 26

5.10.3 Errors/malfunctions that you can resolve ......... 26

5.10.4 Warnings ...................................................................... 26

5.10.5 Temporary malfunctions ......................................... 26

5.10.6 Fault-induced shutdown .......................................... 27

6 Warranty and customer service ..................... 28

6.1 Vaillant warranty....................................................... 28

6.2 Vaillant Service .......................................................... 28

7 Appendix ............................................................ 29

7.1 Technical data ............................................................ 29

7.2 Identification plate .................................................... 31

4 Equipment and functional description ........... 9

4.1 Principle of operation .............................................. 9

4.2 Mode of operation of the coolant circuit ............ 9

4.3 Automatic auxiliary functions ................................ 10

4.4 Design of the geoTHERM exclusive heatpump 11

5 Operation ........................................................... 13

5.1 Familiarising yourself with and operating the

controller ..................................................................... 13

5.1.1 Calling up the screens ............................................. 13

5.2 Setting menus and parameters ............................. 14

5.3 Controller description .............................................. 14

5.3.1 Possible system circuits .......................................... 14

5.3.2 Energy balance control ........................................... 15

5.3.3 Buffer cylinder charging principle ........................ 15

5.3.4 Resetting to factory settings ................................. 15

5.3.5 Control structure ...................................................... 15

5.3.6 Adjusting the energy saving functions ................ 15

5.4 Flow diagram .............................................................. 16

5.5 User level displays .................................................... 17

5.6 Special functions ....................................................... 23

5.7 Starting up the heat pump ..................................... 25

5.8 Shutting down the heat pump ............................... 25

5.9 Inspection .................................................................... 25

Operating Manual geoTHERM exclusive VWS 0020071929_002

General information

Notes on this manual 1

General information

The Vaillant geoTHERM exclusive heat pumps in this
manual are referred to in general as heat pumps and
are available in the following models:

Type name Article number

VWS 63/2 230V 0010007274
VWS 83/2 230V 0010007275
VWS 103/2 230V 0010007276

Table 0.1 Type designations and article numbers

The heat pumps state-of-the-art appliances
which have been constructed in accordance
with recognised safety regulations.

Conformity with the applicable standards has
been demonstrated.

'DACH' seal of approval

VDE seal and Tested Safety

1 Notes on this manual

The following information is intended to help you
throughout the entire documentation. Further docu­ments apply in combination with this operating manual.

We accept no liability for any damage caused by fail­ure to observe these instructions.

Other applicable documents
For the owner of the system:

Guarantee card No. 802922

For the heating engineer:

Installation instructions
geoTHERM exclusive No. 0020051614

Other applicable documents are all manuals that de­scribe the operation of the heat pump, and the manuals
supplied with the accessories used.

1.2 Document storage

Store this operating manual and all related documents
in such a way that they are available whenever required.
You can store the documents inside the pillar cover.
If you move out or sell the appliance, pass on the docu­ments to the buyer.

With the CE mark, we confirm as equipment manufac­turers that the appliances in the geoTHERM exclusive
range satisfy the requirements of the Directive on Elec­tromagnetic Compatibility (Council Directive 89/336/
EEC). The appliances meet the basic requirements of
the Low Voltage Directive (Council Directive 73/23/
EEC).
Furthermore, the appliances satisfy the requirements of
EN 14511 (Heat pumps with electrically-driven compres­sors, heating, specifications for appliances for space
heating and for warming drinking water) as well as EN
378 (safety and environmentally related specifications
for refrigerating systems and heat pumps).

Data badge

An identification plate is attached to the baseplate on
the inside of the geoTHERM exclusive heat pump. The
type designation is located at the top of the front clad­ding (see also Fig. 4.3, Item 1). In Chapter 7.2 of the Ap­pendix there is a picture of an identification plate for
the benefit of technically-interested customers, and a
table explaining the symbols shown on it.

Fig. 1.1 Removing the pillar cover

3Operating Manual geoTHERM exclusive VWS 0020071929_00

1 Notes on this manual
2 Safety instructions

1.3 Symbols used

The following hazard classification symbols are used for
information, activities and energy saving tips in this op­erating manual.

Danger!

Immediate risk of serious injury or death

d

Danger!

Danger of burning and scalding!

H

Caution!

Potentially dangerous situation for the

a

product and environment.

Note!

Useful information and instructions.

h

This symbol points you to energy saving tips. You can
put this setting into effect by means of the heat pump
control system, among other things.

• Symbol for a necessary task

1.4 Applicability of the manual

This operating manual applies exclusively to units with
the following article numbers:
0010007274
0010007275
0010007276
The part number of your unit can be obtained from the
identification plate.

2 Safety instructions

Observe the following safety instructions and regula­tions when operating the heat pump:

• Take advantage of the extensive instruction in the op­eration of the heat pump provided by your specialist
technician.

• Carefully read through this operating manual.

• Only carry out activities that are described in this op­erating manual.

Danger!

Risk of burning as a result of contact

H

2.1 Coolant

The heat pump is delivered with an operational filling of
R 407 C coolant. This is a chlorine-free coolant which
does not affect the Earth's ozone layer. R 407 C is nei­ther a fire hazard nor an explosion risk.

a

with heat pump components!
High temperatures can appear on heat
pump components.
Do not touch any uninsulated pipes on
the heat pump.
Do not remove any of the cladding sec­tions (apart from the pillar cover, see
Chap. 1.2).

Caution!

This appliance contains R 407 C coolant.
The coolant must not be allowed to es­cape into the atmosphere. R 407 C is a
fluorinated greenhouse gas covered by
the Kyoto Protocol, with a GWP of 1653
(GWP = Global Warming Potential).
Before the appliance is disposed of, the
coolant it contains must be completely
drained into a suitable vessel so that it
can then be recycled or disposed of in
accordance with the regulations.

d

h

Danger!

Risk of injury from freezing as a result
of contact with the R 407 C coolant!
Escaping coolant can cause freezing if
the exit point is touched:
Do not inhale gases or vapours emanat­ing from leaks in the coolant circuit.
Avoid contact with the skin and eyes.

Note!

R 407 C presents no danger in normal
use and under normal conditions. With
improper use, however, it can cause inju­ry and damage.

Operating Manual geoTHERM exclusive VWS 0020071929_004

Safety instructions 2

Information on the installation and operation 3

2.2 Prohibition on alterations

Danger!Inappropriate alterations can

cause injuries!

d

The prohibition applies to:
— geoTHERM exclusive heat pumps,
— the Vicinity of geoTHERM exclusive heat pumps,
— the Supply lines for water and power.
For alterations to the heat pump or its peripherals, you
must call on a qualified engineer.

• Do not damage or remove seals or locking devices on
components. Only suitably qualified heating engineer
or our customer service may remove sealed compo­nents.

Under no circumstances should you at­tempt to make changes or alterations to
the heat pump or other parts of the
heating and hot water system yourself.

3 Information on installation and

operation

Vaillant geoTHERM exclusive heat pumps are built using
state-of-the-art technology and according to standard
safety regulations and must be installed by a qualified
expert technician taking the applicable specifications,
regulations and guidelines into account.

Danger!

Risk to life as a consequence of using

d

3.1 Intended use

Vaillant heat pumps are built using state-of-the-art tech­nology and according to standard safety rules and regu­lations. Nevertheless, there is still a risk of injury or
death to the user or others or of damage to the device
and other property in the event of im-proper use or use
for which it is not intended.
This unit is not intended for use by persons (including
children) having limited physical, sensory or mental ca­pacities or who have inadequate experience and/or
knowledge, unless supervised by a person responsible
for their safety or who has been given instructions from
them as to how to operate the unit.
Children must be supervised to ensure that they do not
play with the unit.
The units are intended as heaters for closed hot-water
central heating installations and for hot water genera­tion. Any other use or extended use is considered to be
improper. The manufacturer or supplier is not liable for
any resulting damage. The user alone bears the risk.
It is also considered as intended use to observe:
— the operating and installation instructions
— all other applicable documents
— adherence to the inspection and care conditions.

unqualified personnel!
Installation, inspection and repair may
only be carried out by a qualified engi­neer. In particular, working on the elec­trical components and on the coolant
circuit requires an appropriate qualifica­tion.

5Operating Manual geoTHERM exclusive VWS 0020071929_00

3 Information on the installation and operation

Danger!

Risk to life as a consequence of improper

d

3.2 Requirements of the installation site

The installation site must be dimensioned such that the
heat pump can be properly installed and maintained.

• Ask your heating engineer which currently applicable
national building regulations must be observed.

The installation site must be dry and generally frost­proof.

3.3 Cleaning and care

Do not use any scouring or cleaning agents that could
damage the cladding.

h

3.4 Checking the operating condition of the heat

In contrast to heaters that operate using fossil fuels, no
complex maintenance work is necessary for the Vaillant
geoTHERM exclusive heat pump.

h

3.4.1 Filling pressure of the heating installation

The filling pressure of the heating installation should be
checked at regular intervals. The filling pressure of the
heating installation can be checked from the reading on
the heat pump controller (see sect. 5.5). It should be be­tween 1 and 2 bar. If the water pressure falls below 0.5
bar, the heat pump will be shut down automatically and
an error message will be displayed.

use of the installation.
There is a risk of death or serious injury
to the user or third parties or of damage
to the device and other property in the
event of improper use or use for which it
is not intended.

Note!

Clean the exterior of your heat pump
with a damp cloth and a little soap.

pump

Note!

Have your installation checked regularly
by an expert technician company to en­sure efficient operation of your heat
pump.

Caution!

Risk of damage from water escaping

a

h

3.4.2 Filling level and filling pressure of the brine

Check the brine level or pressure in the brine circuit at
regular intervals. The filling pressure of the brine circuit
("Pressure Heat Source"“) can be checked from the
reading on the heat pump controller (see sect. 5.5). It
should be between 1 and 2 bar. If the brine pressure falls
below 0.2 bar, the heat pump will be shut down auto­matically and an error message will be displayed.

a

a

If the filling level of the brine has fallen so far that it is
no longer visible in the expansion tank, you must have
the brine refilled.

from leaks in the system.
Close the cold water stop valve in the
event of leaks in the hot water pipework.
In the event of leaks in the heating in­stallation switch off the heat pump to
avoid any further leaking.
Have the leaks repaired by an expert
technician.

Note!

The cold water stop valve is not part of
the heat pump scope of supply. It is fit­ted on site by your heating engineer. He
will explain the location and handling of
the component to you.

circuit

Caution!

Risk of damage from brine escaping from
leaks in the system.
In the event of leaks in the brine circuit
switch off the heat pump to avoid any
further leaking.
Have the leaks repaired by an expert
technician.

Caution!

The brine circuit must be filled with the
correct quantity of fluid; otherwise the
system can be damaged.

Operating Manual geoTHERM exclusive VWS 0020071929_006

Information on the installation and operation 3

Fig. 3.1 Filling level of the brine expansion tank

It is normal for the filling level of the brine to fall a little
in the first month after the start-up of the system. The
filling level can also vary depending on the temperature
of the heat source. However it should never sink so far
that it is no longer visible in the expansion tank.

Caution!

Danger of damage

a

3.4.3 Accumulation of condensate (condensation

The evaporator, the brine pumps and the pipes in the
heat source circuit, as well as some components in the
coolant circuit, are insulated in the interior of the heat
pump, so that no condensate can accumulate. If a small
amount of condensate does form, it falls into the con­densate pan. The condensate pan is located on the in­side, in the lower part of the heat pump. As a result of
the heat generated inside the heat pump, the conden­sate in the condensate pan evaporates. Small amounts
of the accumulating condensate can be drained off
under the heat pump. In small amounts, accumulating
condensate should not be seen as a fault in the heat
pump.

The brine circuit of your heat pump sys­tem must only be filled by authorised
technical personnel.
Check the filling level of the brine circuit
at regular intervals and inform your ex­pert technician company if the filling
level in the brine expansion tank is too
low.

water)

3.5 Energy saving tips

Below you will find important tips to help you operate
your heat pump system in an energy and cost-saving
manner.

3.5.1 General energy saving tips

You can even save energy by your general behaviour:
— Ventilate correctly:
Do not leave windows or French windows tilted open,

but rather open the windows wide 3 or 4 times a day
for 15 minutes and turn down the thermostatic valves
or room thermostats while ventilating.

— Do not block the radiators to ensure that heated air

can circulate in the room.
— Use a ventilation system with heat recovery.
The optimum exchange of air in the building is always

guaranteed by the use of a ventilation system with

heat recovery (windows no longer need to be opened

for ventilation purposes). If necessary, the air flow can

be matched to your individual requirements with the

ventilation unit's remote control.
— Check that windows and doors are airtight: Keep shut-

ters and blinds closed at night, so that as little heat as

possible is lost.
— If a VR 90 remote control unit is installed as an acces-

sory, do not obstruct it with furniture, etc., so that it

can measure the circulating room air unhindered.
— Think when using water, for example, take a shower

instead of a bath, promptly renew the seals on drip-

ping taps.

3.5.2 Economising by the correct use of the

control system

Further economies can be made by the correct use of
the control system on your heat pump.
The heat pump control system helps you to make sav­ings by:
— Correct selection of the heating flow temperature:
Your heat pump controls the heating flow tempera-

ture depending on the room temperature you have

set. Therefore select a room temperature that is just

sufficient for your comfort, for example 20 °C. Every

degree over and above that means an increase in en-

ergy consumption of around 6 % per annum.

7Operating Manual geoTHERM exclusive VWS 0020071929_00

3 Information on the installation and operation

— For floor heating use heating curves of < 0.4. For radi-

ator heating, we recommend that they are laid out to
manage with a maximum flow temperature of 50 °C
at the lowest outside temperature; this corresponds to

heating curves of < 0.7.
— An appropriate setting of the hot water temperature:
Only heat hot water as much as is required for con-

sumption. Any further heating results in unnecessary

power consumption, and hot water temperatures of

more than 60 °C also lead to increased lime scale pro-

duction. We recommend that hot water generation be

achieved without the electric auxiliary heating; by this

method, the maximum hot water temperature is de-

termined by the high pressure cut-out in the heat

pump cooling circuit. This cut-out corresponds to a

maximum hot water temperature of approx. 58 °C.
— Setting of individually suited heating times.
— Select the correct operating mode:
For the times that you are asleep or away, we recom-

mend that you switch the heating to set-back mode.
— Heat uniformly:
By means of a meaningfully constructed heating pro-

gramme, you can arrange for all the rooms in your

house to be uniformly heated in accordance with your

pattern of use.
— Set the thermostatic valves:
You can adjust the room temperature to suit your in-

dividual requirements and ensure effective operation

of your heating installation using the thermostatic

valves in combination with a room temperature regu-

lator (weather compensator).
— The operating times of the circulation pump can thus

be optimally matched to the actual need.
— Consult a qualified engineer. He will adjust your heat-

ing installation to suit your personal requirements.
— These and more energy saving tips are provided in

Chap. 5.5. Descriptions of the controller settings and

their energy-saving potential are provided here.

Caution!

Environmental hazard due to improper

a

3.6.1 Appliance

at the end of their useful life.
As this heat pump is not covered by the law regarding
the marketing, return and environmentally friendly dis­posal of electrical and electronic equipment (ElektroG in
Germany), free disposal at a municipal collection point is
not provided.

3.6.2 Packaging

Leave the disposal of the transport packaging to the
qualified servicing company which installed the appli­ance.

3.6.3 Coolant

The Vaillant heat pump is filled with R 407 C coolant.

d

disposal!
The disposal of coolant must only be by
qualified specialists.

If your heat pump is identified with this sym­bol, it does not belong in your household
waste at the end of its useful life. In this case,
make sure that the Vaillant appliance and any
accessories present are properly disposed of

Danger!

Risk of injury from freezing as a result
of contact with the R 407 C coolant!
Escaping coolant can cause freezing if
the exit point is touched.
Do not inhale gases or vapours emanat­ing from leaks in the coolant circuit.
Avoid contact with the skin and eyes.
The disposal of coolant must only be by
qualified specialists.

3.6 Recycling and disposal

Most of the raw materials used to manufacture your
heat pump and all its accessories and associated trans­port packaging can be recycled, and thus have no place
in your household waste.

Note!

Please observe the applicable national

h

legal regulations.
Make sure the old appliance and any ac­cessories are disposed of properly.

h

Note!

R 407 C presents no danger in normal
use and under normal conditions. With
improper use, however, it can cause inju­ry and damage.

Operating Manual geoTHERM exclusive VWS 0020071929_008

Equipment and functional description 4

4 Equipment and functional

description

4.1 Principle of operation

Heat pump systems consist of separate circuits in which
liquids or gases transport the heat from the heat source
to the heating system. As these circuits operate with
differing media (brine/water, coolant and heating
water), they are coupled to one another by means of
heat exchangers. In these heat exchangers the heat
passes from a medium at a high temperature to a medi­um at a lower temperature.

The Vaillant geoTHERM exclusive heat pump uses geo­thermal energy as its heat source.

1/4 Electrical energy

3/4 Environmental energy 4/4 Heating energy

4.2 Mode of operation of the coolant circuit

Cold water

Heating

system

Auxiliary

Umschaltventil

Heizkreispumpe

3

Condenser

Expansion valve

Evaporator

4

Brine pump

Heat source

Fig. 4.2 Operating principle of the heat pump

heating

Diverter valve

2

Compressor

1

Mixer valve

Cooling heat exchanger

Coolant circuit

Heat source circuit

Hot water

Domestic hot water cylinder

Heating water circuit

Fig. 4.1 Using a geothermal heat source

The system consists of separate circuits which are cou­pled to one another by means of heat exchangers.
These circuits are:

- The heat source circuit, by means of which the energy

from the heat source is transported to the coolant cir-

cuit.

- The coolant circuit, which releases its heat to the

heating water circuit by means of evaporation, com-

pression, liquefaction and expansion.

- The heating water circuit, which supplies the heating

and the hot water generator for the domestic hot

water cylinder.

The coolant circuit is connected by means of the evapo­rator (1) to the environmental heat source, from which it
extracts thermal energy. At the same time, the physical
state of the coolant changes; it evaporates. The coolant
circuit is connected by means of the condenser (3) to
the heating system, to which it releases the heat again.
In so doing, the coolant becomes liquid again; it con­denses.
As thermal energy can only pass from a body at a high­er temperature to a body at a lower temperature, the
coolant in the evaporator must have a lower tempera­ture than the environmental heat source. On the other
hand, the temperature of the coolant in the condenser
must be higher than that of the heating water in order
to be able to release the heat to it.

9Operating Manual geoTHERM exclusive VWS 0020071929_00

4 Equipment and functional description

These different temperatures are produced in the cool­ant circuit by means of a compressor (2) and an expan­sion valve (4), which are situated between the evapora­tor and the condenser. The coolant flows in vapour form
from the evaporator into the compressor, where it is
compressed. This causes the pressure and temperature
of the coolant vapour to rise sharply. After this process
it flows through the condenser, where it releases its
heat to the heating water by condensation. It flows as a
liquid to the expansion valve, where it expands signifi­cantly and in so doing loses much of its pressure and
temperature. This temperature is now lower than that
of the outside air which flows through the evaporator.
The coolant can thus take up more heat in the evapora­tor, turning into vapour in the process and flowing to
the compressor. The cycle starts again.

If required, the electric auxiliary heating can be
switched in by means of the integrated controller.

To prevent the formation of condensate in the interior
of the unit, the pipes of the heat source circuit and the
coolant circuit are insulated. Should condensate appear,
however, it is collected in a pan inside the unit and fed
away underneath it. Drop formation under the unit is
thus possible.

geoTHERM exclusive heat pumps by Vaillant are
equipped with an auxiliary cooling function that ensures
a comfortably cool living environment in the summer
when outside temperatures are high. Vaillant heat
pumps with a cooling function utilise the principle of
"passive" cooling which means that the heat is removed
from the rooms and absorbed by the soil via an under­floor heating system, for example. The heating water
absorbs the heat from the rooms during this process
and transfers it via the special switching technology on
the inside of the heat pump to the colder brine which
then transfers the heat to the soil.

4.3 Automatic auxiliary functions

Frost protection

Your controller is equipped with a frost protection func­tion. This function ensures that your heating installation
is protected from frost in all operating modes.
If the outside temperature falls below a value of +3 °C, a
minimum temperature of 5 °C is automatically pro­grammed for each heating circuit.

Cylinder frost protection

This function starts automatically when the actual tem­perature of the cylinder falls below 10 °C. The cylinder is
then heated to 15 °C. This function is also active in the
"Off" and "Auto" operating modes, regardless of the
timer programmes.

Checking the external sensors

The sensors required are determined by the basic hy­draulic circuit arrangement specified during commis­sioning. The heat pump constantly checks automatically
that all sensors are installed and functioning.

Protection from loss of heating water

A pressure sensor recognises a potential loss of water
and switches the heat pump off if the water pressure is
below 0.5 bar gauge pressure. The pressure sensor
switches the heat pump on again when the water pres­sure rises above 0.7 bar gauge pressure.

Pump seizing and valve seizing protection

To prevent the sticking of the heating, circulation and
brine pump or of the hot water diverter valve UV1, the
pumps and the valve, which have not been in operation
for 24 hours, are switched on every day for approx.
20 sec.

Protection against loss of brine

An analogue pressure sensor monitors possible low
brine pressure and switches the heat pump off if the
brine pressure is ever less than 0.2 bar on the pressure
gauge and error 91 is displayed on the error memory.
The heat pump switches on again when the brine pres­sure rises above 0.4 bar gauge pressure.
If the brine pressure drops below 0.6 bar on the pres­sure gauge for more than one minute a warning appears
in menu

Floor protection circuits in all hydraulic systems
without buffer cylinders (with hydraulic plan 6)

If the heating flow temperature in the underfloor heat­ing circuit measured by sensor VF2 continuously ex­ceeds a value of (max. HK temp. + compressor hystere­sis + 2 K, default setting: 52 °C) for more than 15 min­utes, the heat pump switches off with error message
F.72 (see Chap. When the heating flow temperature falls
below this value again and the error has been reset the
heat pump switches back on.
The maximum heating flow temperature can be changed
via vrDIALOG with the "Maximum heating circuit tem­perature" parameter.

a

1.

Caution!

Danger of damage to the floor.
Set the value for the floor protection cir­cuit ensuring that it is not high enough
to damage the floor as a result of exces­sively high temperatures.

Operating Manual geoTHERM exclusive VWS 0020071929_0010

Equipment and functional description 4

Freezing protection function

The outlet temperature of the heat source is constantly
measured. If the heat source outlet temperature falls
below a specific value, the compressor temporarily
shuts off with the error message 20 or 21. If these er­rors occur three times in a row there is a fault-induced
shutdown.
For the geoTHERM VWS heat pumps you can set the
value (Default setting -10 °C) for the freezing protection
in the installation assistant A4.

Cooling

In cooling mode the heat pump performs a cooling func­tion.
You can use the cooling function to set the number of
consecutive days (0 - 99) on which you wish the cooling
system to be in operation.

4.4 Design of the geoTHERM exclusive heat

pump

A domestic hot water cylinder with a capacity of 175 li­tres is integrated into the Vaillant geoTHERM exclusive
heat pump. The heat pump is available in three versions,
which differ mainly in their output.

Type name Heating output (kW)

Brine water heat pumps (S0/W35)
VWS 63/2 230V 6.0
VWS 83/2 230V 8,1
VWS 103/2 230V 10.5

Table 4.1 Type summary

1

2

Fig. 4.3 Front view

Key to Fig. 4.3

1 Sticker with the heat pump type designation
2 Operating console

11Operating Manual geoTHERM exclusive VWS 0020071929_00

4 Equipment and functional description

1

9

8

7

2

6

5

Fig. 4.4 Rear view

Key to Fig. 4.4

1 Hot water connection, domestic hot water cylinder
2 Cold water connection, domestic hot water cylinder
3 Heat source to the heat pump
4 Heat source from the heat pump
5 Heating return
6 Heating flow
7 Handle trough
8 Handle trough/cable grommet, electrical connection
9 Ventilation, heating flow to domestic hot water cylinder

3

4

Operating Manual geoTHERM exclusive VWS 0020071929_0012

5 Operation

5.1 Familiarising yourself with and operating the

controller

Operation 5

1

Basic data

Date
Day of week

6

5

Fig. 5.1 Sample illustration no. 3Fig. 7.1 Overview of operation

Key

1 Menu name
2 Cursor indicating the selected parameter
3 Menu number
4 Dial

,

Set parameter (turn), Select parameter (press)

5 Dial ,

select menu (turn), activate special operating mode (press)

6 Information line (handling request shown in example)

Time

Set day

2

3

4

Typical operating sequence on the operator level

• Turn the dial until the menu
required has been selected.

• Turn the dial until the pa­rameter to be modified has
been selected.

All programming of the heat pump is carried out by
means of the two dials (
The dial

is used to select the parameter (by pressing)

and ) on the controller.

and to alter the parameter (by turning). The dial
used to select the menu (by turning) and to activate
special functions (by pressing).

5.1.1 Calling up the screens

The menus are identified by a number at the top right of
the display. You can access the next menu by turning

dial. The numbers make it easier to find individual

the
menus during programming.

is

• Press the dial to mark the
parameter to be modified.
The parameter will be high­lighted on a dark background.

• Turn the dial to modify the
parameter setting value.

• Press the dial to mark the
setting value to be accepted.

• Repeat this sequence until all
the settings have been made.

13Operating Manual geoTHERM exclusive VWS 0020071929_00

5 Operation

5.2 Setting menus and parameters

Setting to date Modified setting

Select menu:

Holiday programming
for cpl. System

Period of
time

1 >06.01.08 08.01.08

2 14.01.08 30.01.08
Room Temp. setpoint 12°C
>Set start day

Basic data

6

• Turn the dial: Select

menu e.g. from menu 6 to

7.

Select parameter:

7

Basic data

Date >21.04.08
Day of

week
Time 09:35

>Set day

Basic data

7

Mo

7

Date >21.04.08
Day of

week
Time 09:35

>Set day

Basic data

Date 21.04.08
Day of

week
Time 09:35

>Set weekday

Mo

>Mon

• Turn the dial: select the

parameter to be modified
e.g. from line 1 day to line
2 weekday (in this
example continue to turn
3 snap-in points).

Modify parameter weekday

7

from Monday to Tuesday:

• Push the dial:

Select parameter:

• Turn the dial:

Modify parameter,

• Push the dial:

Accept modification.

Fig. 5.2 Setting menus and parameters

5.3 Controller description

The heating engineer will have set all the operating pa­rameters to preset values during commissioning, so that
the heat pump can function optimally. However you can
individually set and adapt the operating modes and
functions afterwards.

Date 21.04.08
Day of

week
Time 09:35

>Set weekday

Basic data

Date 21.04.08
Day of

week
Time 09:35

>Set weekday

>Mon

7

>Tues

5.3.1 Possible system circuits

The controller can control the following system circuits:
– a heating circuit,
– an indirectly heated hot water storage tank,
– a hot water circulation pump,
– a buffer circuit.

In order to extend the system a buffer circuit can be
used to connect up to six additional mixer circuit mod­ules VR 60 (accessories) each with two mixer circuits.
The controller on the operating panel of the heat pump
is used to programme the mixer circuits. In order to op­erate under comfortable conditions you can connect the
remote control units VR 90 for the first eight heating
circuits.

Operating Manual geoTHERM exclusive VWS 0020071929_0014

Operation 5

5.3.2 Energy balance control

Energy balance control applies only to hydraulic sys­tems without buffer cylinders (e.g. hydraulic plan 6).
For economical and fault-free operation of a heat pump,
it is important to regiment the starting of the compres­sor. The start-up of the compressor is the point at which
the highest loading occurs. With the help of the energy
balance controller it is possible to minimise starts of the
heat pump without compromising the comfort of a
pleasant room atmosphere.
As with other weather-controlled heating controllers the
controller determines a supply set target temperature
by capturing the outside temperature through a heating
curve. The energy balance calculation is carried out
based on this supply set target temperature and the
supply real temperature the difference of which is
measured per minute and added up:

1 Degree minute [°min] = 1 K Temperature difference in
the Course of 1 Minute

The heat pump starts up at a defined heat deficit and
only switches off again when the supplied heat is equal
to the heat deficit.
The larger the preset negative numerical value is, the
longer the periods for which the compressor is kept run­ning or at standstill.

5.3.3 Buffer cylinder charging principle

The buffer cylinder is controlled depending on the sup­ply set target temperature. The heat pump heats when
the temperature of the buffer cylinder head tempera­ture sensor VF1 is smaller than the set target tempera­ture. It continues to heat until the buffer cylinder floor
temperature sensor RF1 has reached the set target tem­perature plus 2 K.
In the connection to a hot water cylinder charging the
buffer cylinder is also charged when the temperature of
the head temperature sensor VF1 is less than 2 K higher
than the set target temperature (premature reheating):
VF1 < T VL set + 2 K.

• In the basic display on the graphic display press both
dials at the same time for min. 5 sec.

After that you can select whether to reset only the
timer programme or all values to the default settings.

5.3.5 Control structure

The Top level display is a Graphics display. It is the
starting point for all the available displays. This display
reappears automatically if you do not actuate any of the
dials for a long time when setting values.

Controller operation is subdivided into four levels:

The Operator level is specified for the operator.
In Sect. 5.4 all of the controller's displays are shown as
a flow diagram. A detailed description of the displays is
contained in Sect. 5.5.

The Code level (menu C1 - C9, D1 - D5, I1 - I5 and A1 - A9)
is reserved for the engineer and protected by a code to
protect it from unintentional modification.
As the operator you can scroll through the menus of the
code level and view the system-specific setting parame­ters however without changing the values.
In the menus C1 to C9 the engineer sets system-specific
parameters.
The menus D1 to D5 enable the engineer to operate and
test the heat pump in the diagnosis mode.
In menus I1 to I5 you are given general information on
the settings of the heat pump.
Menus A1 to A9 take the engineer through the installa­tion menu to put the heat pump into operation.

The display and selection of Special function (e.g. the
energy-saving function) is also possible for the operator.
Instructions are given in Sect. 5.6 as to how to activate
the special functions.

The fourth level contains functions for the optimisation
of the system and can only be set by the engineer using

vrDIALOG 810/2.

5.3.4 Resetting to factory settings

Caution!

Inadvertent deletion of specific settings!

a

When you reset the control system to
the default settings, specific system
settings can be deleted and the system
can sut down. The system does not suf­fer damage.

5.3.6 Adjusting the energy saving functions

Also described in Chap. 5.5 are heat pump settings that
will enable a reduction in your energy costs. This is
achieved by optimum setting of the heat pump's weath­er-controlled energy balance controller.

This symbol points you to these energy saving tips.

15Operating Manual geoTHERM exclusive VWS 0020071929_00

5 Operation

5.4 Flow diagram

Graphics display

Graphics display cooling*

Energy input display

Mo 21.04.08
Flow Temp. CH

System pressure 1,2bar
Brine pressure
CH : Comp only

Warning message
Warning message

16:49

28ºC

1,4bar

Reset to default

settings

We 16.02.08 9:35

> 5 sec.

Factory setting
Cancel

Time programme
Everything

> Select

NO/YES
NO/YES
NO/YES

Installer Menu

We 16.02.08 9:35

Sparen aktiviert for > 12:00

> Select stop time

We 16.02.08 9:35

Party function enabled

We 16.02.08 9:35

One-time
DHW tank loading enabled

1

Cooling settings *

We 16.02.08 9:35

Cooling function active for >3days

> Set duration

HK2
Parameters

HK2

Heating mode

Parame ter

>Auto

Betriebsart Heizen

Set value day

>Auto

Night set back temp.

Raumsolltemp.

>Select operation mode

Night set back temp.

Domestic hot water
Parameters

Operation mode DHW > Auto

Max. DHW temp.

Min. DHW temp.
Current DHW temp.

>Select operation mode

HK2
Time programme

HK2
Time programme

>Mo

HK2

1 00:00 24:00

Time programme

>Mo

2 : :

1 00:00 24:00

>Mo

3 : :

2 : :

1 00:00 24:00

3 : :

>Select day of the week

2 : :
3 : :

>Select day of the week

>Select day of the week

20 ºC

15 ºC

60 ºC

44 ºC

51 ºC

Fig. 5.3 Displays in the User level

2

20 ºC

15 ºC

4

5

2

5

5

Domestic hot water
Time programme

>Mo
1 06:00 22:00
2 : :
3 : :

>Select day of the week

Circulation pump
Time programme

>Mo
1 06:00 22:00
2 : :
3 : :

>Select day of the week

Holiday programming
for cpl. System

Periods
1 >06.01.08 08.01.08
2 14.01.08 31.01.08
Room Temp. setpoint

>Set starting day

12 ºC

5

Basic data 7

Date 21.04.08
Day of week > Mo
Time 09:35

5

6

> Set day of the week

Code layer 8

Code-Nummer:
> 0 0 0 0

Standard code:

1 0 0 0
>Adjust numeric character

Code level only for

expert technicians

Operating Manual geoTHERM exclusive VWS 0020071929_0016

5.5 User level displays

The individual displays on the operating panel are de­scribed and explained below.

Display shown Description

Graphics display (Top-level display)

You can read off the instantaneous state of the system from this dis­play. This is always shown if you have not actuated either of the dials
for a long time while another display is showing.

Operation 5

Outside temperature (here 10 °C)

Source inlet temperature: Temperature sensor;
in the example 9 °C

Under the arrow the output of the heat source
(in the example 10 KW) is displayed.
The extent of darkening of the arrow graphically
shows the energy efficiency of the heat pump
under the given operating conditions.

The output of the heat source must not be
equated with the heating output.
The heating output corresponds to approx. the
output of the heat source + compressor output

When the compressor or the electric auxiliary
heating is switched on, the arrow is shown filled.

>>> Left and right flash when the compressor is
switched on and energy is consequently being
taken from the environment and fed to the heat­ing system.

>>> Right flashes when energy is being fed to the
heating system (e.g. only from the electric auxil­iary heating).

The heat pump is in the CH mode. Moreover, the
heating flow temperature is displayed (in the ex­ample 30 °C).

The symbol indicates that the domestic hot
water cylinder is being heated or that the heat
pump is in the ready state. The temperature in
the domestic hot water cylinder is also dis­played.

The symbol indicates that the heat pump is in
cooling operation. Under the symbol the actual
heating flow temperature is displayed
(in the example 20 °C).

Table 5.1 Settable parameters in the operator level

17Operating Manual geoTHERM exclusive VWS 0020071929_00

5 Operation

Display shown Description

Energy input display

Shows the energy extracted from the environment for each of the 12
months of the current year (black bar). White-filled bars represent the
future months of the year; the height of the bar corresponds to the
yield for the month in the previous year (comparison possible). On
commissioning, the height of the bars is zero for all months, as no in­formation is available yet.
The scaling (in the example, 4000 kWh) adapts automatically to the
month's highest value.
Top right the total of the environmental yield since commissioning is
displayed (in the example: 13628 kWh).

Mon. 21.04.08 16:49 1
Current flow temp. 28°C
CH pressure 1.2bar
Brine pressure 1.4bar

Heating only comp.

Warning message
Warning message

Day, date, time as well as flow temperature, heating system pressure
and heat source pressure are displayed.

Current flow temp: Current flow temperature in the unit.
Heating system pressure: Pressure sensor heating circuit.
Pressure heat source: Pressure of the heat source (pressure sensor,

heat source circuit, brine pressure)
Heating only comp.: this status message provides information on the
current operating status.
The following are possible:
CH: Comp. only.
CH: Comp+Aux
CH: Aux only
CH: Comp&aux off
DHW: Comp&aux off
DHW: Comp only
DHW: aux only
Peak Rate: WW
Peak Rate: Stand-by
Acceleration mode
Frost prot. Heating
Frost prot. Cylind.
Legionella protect.
Automatic pump spin
Floor drying
Venting mode
Fault shutdown: heating
Error shutdown: heating
Fault shutdown: DHW
Error shutdown: DHW
Malfunction
Blocking error
Operation interlock
CH Comp overrun
WW Comp overrun
Cooling & WW
CH return too high

Table 5.1 Adjustable parameters at the operator level (contd.)

Under critical operating conditions a warning message is displayed in
both lower display lines. These lines are empty when the operating
conditions are normal.

Operating Manual geoTHERM exclusive VWS 0020071929_0018

Operation 5

Display shown Description Factory setting

HK2
Parameters

Operating mode heating

>Auto
Set value day 22°C
Night set back temp. 15°C
>Select operating mode

The Room set target temperature is the tempera-

2

ture to which the heating should be regulated in the
operating mode "Heat" or during the time slots.

Note: Select a room temperature that is just high
enough to ensure your personal well-being
(e.g. 20 °C). Each degree over and above the set
value means an increase in energy consumption of
around 6 % per annum.

The Set-back temperature is the temperature to
which the heating is regulated during the set-back
period. An individual set-back temperature can be
set for each heating circuit.

The set operating mode determines under which
conditions the assigned heating circuit or hot water
circuit should be regulated.

Room set target
temp.: 20°C

Set-back temp.:
15°C

The following operating modes are available for
heating circuits:
Auto: The operation of the heating circuits alter­nates between the Heating and Energy Saving oper­ating modes in accordance with a settable timer pro­gramme.
Eco: The operation of the heating circuits alternates
between the Heating and Off operating modes in ac­cordance with a settable timer programme. The
heating circuit is switched off during the set-back
period provided the frost protection function (which
depends on the outside
temperature) is not activated.
Heating: The heating circuit operates at the room
set target temperature regardless of any settable
timer programme.
Energy sav: The heating circuit operates at the set­back temperature regardless of any settable timer
programme.
Off: The heating circuit is off, provided that the frost
protection function (depending on the external tem­perature) is not activated.

Note:

Additional heating circuits are displayed, depending
on the system configuration.

Table 5.1 Adjustable parameters at the operator level (contd.)

19Operating Manual geoTHERM exclusive VWS 0020071929_00

5 Operation

Display shown Description Factory setting

DHW loading
Parameters

Operating mode WW Auto Auto

Max. DHW temp. 60°C 60°C

Min. DHW temp. 44°C 44°C
Cylinder temp. REAL 51°C 51°C
>Select set target temperature

For connected domestic hot water cylinders and the

4

circulation circuit the operating modes Auto, On and
Off are possible.

The maximum WW temperature determines the
temperature to which the domestic hot water cylin­der should be heated.
The minimum WW temperature determines the
limit below which the domestic hot water cylinder is
heated.
Note: The maximum WW temperature is only dis­played when the auxiliary hot water heating is ena­bled.
Without electric auxiliary heating, the WW tempera­ture is limited by the pressure sensor control shut­off in the cooling circuit and cannot be adjusted!
Cylinder temp. REAL: Current temperature in the
domestic hot water cylinder.

We recommend that hot water generation be
achieved without the electric auxiliary heating. by
this method, the maximum WW temperature is de­termined by the high pressure cut-out in the heat
pump cooling circuit. This cut-out corresponds to a
maximum hot water temperature of 58 °C. In order
to keep the heat pump starts to an absolute mini­mum as low a min. hot water temperature as possi­ble should be selected.

Min. hot water
temp. 44 °C

You can set the heating times for each heating cir-

HK2
Time programme
>Mon

1 00:00 24:00
2: :
3: :

>Select weekday/Block

5

cuit in the HK2-Timer programme menu.
Up to three heating times can be programmed per
day or block. The control system operates according
to the heating curve and the room setpoint tempera­ture.

The set back times can be dispensed with, depending
on the tariff agreement with power company (VNB)
or the construction of the house.
Power companies offer their own discounted tariffs
for heat pumps. It can make sense on economic
grounds to make use of the more favourable off­peak power.
In low-energy houses (in Germany standard as from
1st February 2002 energy conservation regulation)
the room temperature reduction can be dispensed
with owing to low heat losses.
The desired set-back temperature must be set in
menu 2.

Table 5.1 Adjustable parameters at the operator level (contd.)

Mo. – Su.
0:00 – 24:00 hours

Operating Manual geoTHERM exclusive VWS 0020071929_0020

Operation 5

Display shown Description Factory setting

DHW loading
Time programme

>Mon

1 06:00 22:00
2: :
3: :

>Select weekday/Block

You can set the times at which the domestic hot

5

water cylinder is heated in the "WW Timer Pro­gramme" menu.

Up to three times can be programmed per day or
block.

The hot water generation should only be active at
times when really hot water is to be run. Please set
this timer programme to your minimum require­ments.
As an example, for working people a window from

6.00 – 8.00 hrs. and a second window from 17.00 –

23.00 hrs.can minimise the energy consumption due
to hot water generation.

Mon – Fri
6:00 – 22:00 hrs.

Sat

7:30 – 23:30

Su.
7:30 – 22:00

You can set the times at which the circulation pump

Circulation pump
Time programme

>Mon

1 06:00 22:00
2: :
3: :

>Select weekday/block

5

is to be operational in the "Circulation Pump Timer
Programme" menu.

Up to three times can be programmed per day or
block.
If the hot water operating mode (see menu
set to "ON", the circulation pump runs continuously.

The timer programme Circulation Pump should cor­respond to the
timer programme Hot Water, if necessary the time
slots could be selected even more restrictively.
If the desired hot water temperature is obtained
quickly enough without switching on the circulation
pump, the circulation pump can likewise be deacti­vated.
In addition, you can briefly activate the circulation
pump by means of electronic pushbutton switches
mounted in the immediate vicinity of the taps and
connected to the heat pump (the same idea as stair­well lighting). The operating times of the circulation
pump can thus be optimally matched to the actual
need.
Consult your expert technician about doing this.

Table 5.1 Adjustable parameters at the operator level (contd.)

3) is

Mon – Fri
6:00 – 22:00 hrs.

Sat
7:30 – 23:30

Su.
7:30 – 22:00

21Operating Manual geoTHERM exclusive VWS 0020071929_00

5 Operation

Display shown Description Factory setting

Holiday programming
for cpl. System

Period of
time

1 >06.01.08 08.01.08
2 14.01.08 30.01.08

Room Temp. setpoint 12°C
>Set start day

For the controller and its connected system compo-

6

nents it is possible to programme two holiday peri­ods with the introduction of the date. Moreover, the
desired target room temperature can be set for holi­days, i.e. regardless of the preset timer programme.
After the holiday time has elapsed, the controller au­tomatically goes back to the previously selected op­erating mode. The holiday program can be activated
only in auto and eco operating mode.
Connected cylinder charging circuits or circulation
pump circuits are automatically switched to OFF op­erating mode during the holiday timer programme.

Connected cylinder charging circuits or circulation
pump circuits are automatically switched to OFF op­erating mode during the holiday timer programme.
Prolonged periods of absence can be set in the dis­play "Programme holidays". The target temperature
during this period should be selected to be as low as
possible.
During this period hot water generation is not in op­eration.

Period 1:

01.01.2003 –

01.01.2003

Period 2:

01.01.2003 –

01.01.2003

Room Temp.
setpoint 15 °C

You can set the current Date, the Day of the week

Basic data

Date 21.04.08
Day of

week
Time 09:35

>Settable values

Code layer

Code number:

Mo

>0 0 0 0

7

and the current Time, if DCF radio clock reception is
not possible, in the “Basic Data”menu.
These settings apply to all connected system compo­nents.

To access the Code level (Installer level), the appro-

8

priate code must be entered.
To view setting parameters without entering the
code, you must press the dial
view all parameters of the code level by turning the
dial

but not change them. As operator, without en-

tering the code, you can view all menus in the code

>Set figures

level however not modify them.

Caution! Do not try to access the code level by mak­ing arbitrary entries in the code level. Unintentional
modification of the system-specific parameters can
cause malfunctions or damage to the heat pump.

Table 5.1 Adjustable parameters at the operator level (contd.)

once. You can then

Operating Manual geoTHERM exclusive VWS 0020071929_0022

5.6 Special functions

Special functions can be selected only from the basic
display. To do so press the left-hand dial
To change the parameter, you must turn the

.

dial. The

following special functions can be selected:

Operation 5

• Energy saving function: Press

• Party function: Press

dial twice.

• One-time charging: Press

• Cooling operation: Press

dial once.

dial 3 x.

dial 4 x

To activate one of the functions, you merely have to se­lect it. In the energy saving function it is additionally
necessary to enter the time until which the energy sav­ing function (regulation to set-back temperature) is to
apply.

The basic display appears either after the function has
elapsed (reaching the time) or by pressing the

dial

again.

Display shown Description

We 16.02.08 9:35

Saving function:
With the saving function you can set back the heating times for a set-

Energy saving enabled

table period.

Enter the time for the end of the saving function in the format hh:mm
(hour:minute).

>Select end time

We 16.02.08 9:35

Party function enabled

Party function:
With the party function you can continue the heating and hot water
times beyond the next switch-off time up to the next heating start.
The party function can only be used for the heating circuits or hot
water circuits for which the operating mode "Auto" or "ECO" is set.

We 16.02.08 9:35

one-time
DHW tank loading enabled

Table 5.2 Special functions

One-time charging:
This function allows you to charge the hot water cylinder once, re­gardless of the current time program.

23Operating Manual geoTHERM exclusive VWS 0020071929_00

5 Operation

Display shown Description

We 16.02.08 9:35

Cooling operation:

Cooling duration: OFF/1 to 99 days.

Cooling function active for > 3 Days

Table 5.2 Special functions (ctnd.)

If the cooling operation is active,
– the symbol of an ice crystal appears in the graphic display.

• Reset to default setting: Keep dial and dial
pressed for longer than 5 seconds. After that you can
select whether to reset only the timer programme or
all values to the default settings.

Display shown Description

We 21.04.08 9:35

Factory setting
Cancel NO/YES
Time programme NO/YES
Everything NO/YES
>Settable values

The default settings are re-established.

Caution! Ensure that a qualified technician performs the default set­ting reset. The system-specific settings are reset. The system can be
shut down. The system does not suffer damage.

Press both dials for at least 5 seconds to request the menu default
setting.

Table 5.3 Re-establishing the default setting

Operating Manual geoTHERM exclusive VWS 0020071929_0024

Operation 5

5.7 Starting up the heat pump

The start-up of your heat pump was carried out after in­stallation by your expert technician company.
A repeated start-up will not even be necessary in the
event that your heat pump disconnects from the mains
unexpectedly, for example as a result of a voltage drop
(power cut, circuit breaker defective, circuit breaker de­activated). Your geoTHERM heat pump has an automat­ic reset function, i.e. the heat pump reverts automatical­ly to its starting condition, provided no fault is present
in the heat pump itself. Find out what to do in the event
of a fault in Chap. 5.10.

5.8 Shutting down the heat pump

The heat pump can only be shut down via the control
panel by deactivating the heating and hot water genera­tion functions in the respective menus (see
Chap. 5.4 Displays at user level).

Note!

Should it be necessary to remove all

h

5.9 Inspection

An annual inspection/maintenance of the unit by a spe­cialist is a prerequisite for continuing operational safety,
reliability and a long working life.

d

Only genuine Vaillant spare parts may be used for in­spections, maintenance and repair work to ensure the
perfect long-term working order of all functions of your
Vaillant appliance and to prevent the approved series
condition from being changed.
Any spare parts which might be required are listed in
the relevant current spare parts catalogues.
Information can be obtained from Vaillant Customer
Service Centres.

electric power from the heat pump in­stallation, then switch off the circuit
breaker on your heating system.

Danger!

Inspections / Maintenance work not car­ried out can result in damage to proper­ty and personal injury.
Have inspections maintenance and re­pairs carried out only by a recognised
expert technician company.

5.10 Troubleshooting and Diagnosis

5.10.1 Error messages on the Controller

Error messages appear roughly 20 seconds after the
error has occurred in the display and are written in the
error memory of the controller if the error persists for
roughly 3 minutes. The engineer can then call up the
error message from the memory at a later date.

Error History

Fault number >1
Fault code 41

16.02.08 07:18
Error CH circuit
Sensor T3 heat source

Fig. 5.4 Error message in the error memory Menu I1

The geoTHERM control system has various malfunction
types:
– Malfunction of Komponents which are connected via

eBUS.

– Temporary Shutdown

The heat pump remains in operation. The error is dis­played and disappears independently when the cause
of the fault is removed.

– Fault-induced Shutdown

The heat pump is shut down. It can only be restarted
after the cause of the fault has been removed by the
expert technician and the error reset.

– Moreover, Other Errors/Malfunctions can occur on

the unit or system.

Caution!

Heat pump malfunction.

a

h

Immediately notify your expert techni­cian if error messages appear on the dis­play on the operating panel which are
not listed in tables 5.4 to 5.7.
Do not attempt to remove the source of
the malfunction yourself.

Note!

Not all of the following listed malfunc­tions have to be dealt with by an expert
technician.
If you are unsure whether you can reme­dy the fault yourself or not or if the
error occurs repeatedly contact your ex­pert technician or Vaillant customer
service.

I1

25Operating Manual geoTHERM exclusive VWS 0020071929_00

5 Operation

5.10.2 Activating emergency mode

Depending on the type of malfunction the expert techni­cian can set the heat pump to continue operation in
emergency mode (via an integrated electric auxiliary
heating) until the cause of the error is remedied, and ei­ther for heating operation (display "heating priority"),
for hot water operation (display "hot water priority") or
for both (display "heating priority/hot water priority"),
see the following tables, column "emergency operation".

5.10.3 Errors/malfunctions that you can resolve

Malfunction sign Possible cause Solution

Noise in the heating
circuit.

Table 5.4 Other Malfunctions

Dirt in the heating
circuit.
Faulty pump.

Air in the heating
circuit.

Bleeding heating
circuit.

5.10.4 Warnings

The following warning messages do not cause a mal­function in the operation of the heat pump. The heat
pump is not shut down.
Take note of the error code and text and discuss this
during the next inspection with the expert technician.

Fault code Error text/description

26 Overheating on compressor pressure side
36 Low brine pressure

Table 5.5 Warning messages, no shutdown

5.10.5 Temporary malfunctions

The heat pump is shut down temporarily and starts up
again independently when the cause of the fault is re­moved.
Depending on the error the heat pump switches back on
automatically after 5 or 60 minutes.
Take note of the error code and text and discuss this
during the next inspection with the expert technician.

Fault code Error text/description

20 Frost protection heat source monitoring source

outlet

Temperature difference of the heat source > set
value "permitted temp. difference"
This error message is deactivated as standard and
can only be activated via vrDIALOG parameter
"permitted temp. difference" (20 K difference
means deactivated).

22 Frost protection heat source over. source outlet

Source outlet temperature too low
(<parameter freezing protection in menu A4)

27 Coolant pressure too high

The integrated high pressure switch tripped at
30 bar (g).

The heat pump cannot be restarted until after 60
min. at the earliest.

28 Coolant pressure too low

The integrated low pressure switch tripped at

1.25 bar (g).

29 Coolant pressure outside the range

If the error occurs twice in a row the heat pump
cannot be started until after 60 min. at the earliest.

Table 5.6 Temporary malfunctions

Operating Manual geoTHERM exclusive VWS 0020071929_0026

5.10.6 Fault-induced shutdown

Errors could occur which result in the shutdown of the
heat pump.

Fault code Error text/description

32 Error heat source sensor T8

Short-circuit in the sensor

33 Error heat circuit pressure sensor

short-circuit in the pressure sensor

34 Error brine pressure sensor

short-circuit in the pressure sensor

40 Error comp outlet sensorT1

Short-circuit in the sensor

41 Error heat source sensor T3

Short-circuit in the sensor

42 Error HP return sensor T5

Short-circuit in the sensor

43 Error HP flow sensor T6

Short-circuit in the sensor

44 Error external sensor AF

Short-circuit in the sensor

45 Error DHW tank sensor SP

Short-circuit in the sensor

46 Error HB flow sensor VF1

Short-circuit in the sensor

47 Error HB return sensor RF1

Short-circuit in the sensor

48 Error flow sensor VF2

Short-circuit in the sensor

52 Sensors are not suited to the

hydraulic plan

60 Frost protection heat source

monitoring source outlet

Error 20 has occurred three times in
a row

62 Frost protection heat source

monitoring source outlet

Error 22 has occurred three times in a
row

Emergency
mode

possible

possible

possible

possible

possible

possible

possible

possible

possible

possible

WW
operation
possible

_

possible

possible

Operation 5

Fault code Error text/description

72 Flow temperature too high for

81 Coolant pressure too high

83 Coolant pressure too low check heat

84 Coolant pressure outside the range

90 Heating system pressure too low

91 Brine pressure too low

96 Error - sensor fault

97 no power for compressor possible

Table 5.7 Fault-induced shutdown (ctnd.)

underfloor heating

Flow temperature is for 15 min. higher
than a set value (max. HK temp. +
compr. hysteresis + 2 K).

Error 27 has occurred three times in a
row

source

Error 28 has occurred three times in a
row

Error 29 has occurred three times in a
row

Pressure <0.5 bar
Heat pump switches off and starts up
automatically when the pressure
increases to over 0.7 bar

Pressure <0.2 bar
Heat pump shuts down and goes into
operation automatically when the
pressure rises above 0.4 bar

Short circuit in pressure sensor

• Consult your expert technician about doing this.

Note!

Only an expert technician can remedy

h

the fault and reset the error code.

Once the expert technician has remedied the error and
reset the error he can restart the heat pump.

Emergency
mode

_

possible

possible

possible

_

possible

possible

Table 5.7 Error shutdown

27Operating Manual geoTHERM exclusive VWS 0020071929_00

6 Warranty and customer service

6 Warranty and customer service

6.1 Vaillant warranty

Vaillant provide a full parts and labour warranty for this
appliance.
The appliance must be installed by a suitably competent
person in accordance with the Gas Safety (Installation
and Use) Regulations 1998, and the manufacturer’s in­structions. In the UK ‘CORGI’ registered installers under­take the work in compliance with safe and satisfactory
standards.
All unvented domestic hot water cylinders must be in­stalled by a competent person to the prevailing building
regulations at the time of installation (G3).
Terms and conditions apply to the warranty, details of
which can be found on the warranty registration card in­cluded with this appliance.
Failure to install and commission this appliance in com­pliance with the manufacturer’s instructions may invali­date the warranty (this does not affect the customer’s
statutory rights).

6.2 Vaillant Service

To ensure regular servicing, it is strongly recommended
that arrangements are made for a Maintenance Agree­ment. Please contact Vaillant Service Solutions
(0870 6060 777) for further details.

Operating Manual geoTHERM exclusive VWS 0020071929_0028

Appendix 7

7 Appendix

7.1 Technical data

Caution!

R 407 C is a chlorine-free coolant which

a

Description Unit VWS 63/2 230 V VWS 83/2 230 V VWS 103/2 230 V

Article number - 0010007274 0010007275 0010007276
Height with connections

Width
Depth without pillars
Depth with pillars

Total weight

- With packaging

- Without packaging

- Ready for operation
Transport weight

- Domestic hot water cylinder module

- Heat pump module
Rated voltage

- Heating circuit/Compressor

- Control circuit

- Auxiliary heating
Fuse, slow-blow

- Unblocked mains supply
Alternative operation (as-delivered

condition 4 kW)
Parallel operation A

dual-circuit supply, heat pump tariff

- Compressor, single

- Auxiliary heating 2/4 kW, single
Dual-circuit supply, special tariff

- Alternative operation (as-delivered
status 4kW)
Parallel operation

- Pumps and controllers
Start-up current

- Without start-up current limiter

- With start-up current limiter
Rated output

- Min. for B-5W35

- Max. for B20W60

- Auxiliary heating

does not affect the ozone layer. Never­theless, servicing work on the cooling
circuit should only be carried out by au­thorised specialists.

mm
mm
mm
mm

kg
kg
kg

kg
kg

-

A

A
A

A

A
A

A
A

kW
kW
kW

1930

600
650
840

231
216

402

100
106

16/20 25/25
25/35 35/50

16

16/20

16/20 25/25 25/25
25/35

4

58

< 45

1.4

2.8
2/4

239
224

411

100

114

1/N/PE 230 V 50 Hz
1/N/PE 230 V 50 Hz
1/N/PE 230 V 50 Hz

25

16/20

35/50

4

76

< 45

1.9

4.0

2/4

242

227
415

100

117

25

16/20

35/50

4

97

< 45

2.4

4.9

2/4

EN 60529 level of protection - IP 20
Hydraulic connections

- Heating circuit flow and return

- Heat source flow and return

- Cold/hot water

Table 7.1 Technical data

mm
mm
mm

G 1 1/4", Ø 28
G 1 1/4", Ø 28

R 3/4"

29Operating Manual geoTHERM exclusive VWS 0020071929_00

7 Appendix

Description Unit VWS 63/2 230 V VWS 83/2 230 V VWS 103/2 230 V

Integrated domestic hot water cylinder

- Contents

- Max. operating pressure

- Max. temperature with heat pump

- Max. temp. with heat pump and
auxiliary heating

Heat source circuit (brine circuit)

- Brine type

- Max. operating pressure

- Min. inlet temperature

- Max. inlet temperature

- Nominal flow rate dT 3K

- Residual head dT 3K

- Nominal flow rate dT 4K

- Residual head dT 4K

- Electrical power consumption - pump

CH circuit

- Max. operating pressure

- Min. flow temperature

- Max. flow temperature

- Nominal flow rate dT 5K

- Residual head dT 5K

- Nominal flow rate dT 10K

- Residual head dT 10K

- Electrical power consumption - pump

Refrigerant Circuit

- Coolant type - R 407 C

- Quantity

- Number of revolutions EX valve

- Permissible operating overpressure

- Compressor type

- Oil

- Oil filling quantity

DHW circuit
Expansion vessel bar 4 4 4
Expansion valve setting bar 6 6 6
Maximum water supply pressure bar 10 10 10
Pressure reducing valve bar 3.5 3.5 3.5
Temperature and pressure relief valve

setting
Heat up time min 113 98 86

Recovery time min 88 74 60
Heat pump performance data

B0W35 dT5

- Heating output

- Power consumption

- Performance figure/COP

B5W55

- Heating output

- Power consumption

- Performance figure/COP

Maximum passive cooling output
under the following conditions: heating
flow VL = 18 °C and
heating return RL = 22 °C!
Sound output dbA 48 49 50

Conforms to safety regulations - CE mark

l
MPa (bar)
°C
°C

­MPa (bar)
°C
°C
l/h
mbar
l/h
mbar
W

MPa (bar)
°C
°C
l/h
mbar
l/h
mbar
W

kg

­MPa (bar)

-

­l

ba r 7 7 7
ºC 95 95 95

kW
kW

-

kW
kW

­kW 3.8 5.0 6.2

1453

335

1090

433

132

1061
386

517

490

93

1.9

9.0

1.3 1,45 1,45

6.0

1.4

4.2

6.3

2.1

3.0

Low Voltage Directive 73/23/EWG
EMC Directive 89/336/EWG
EN 60335
ISO 5149

Ethylene glycol 30 %

175

1 (10)

55
75

0.3 (3)

-10
20

1936

277

1452

397

132

0.3 (3)
25
62

1375

324
697

460

93

2.2

9.0

2.9 (29)
Scroll

Ester

8,1

1.9

4.2

8.6

2.8

3.0

2530

216

1898

398

195

1803

399
848
580

132

2.05

9.0

10.5

2.5

4.2

10.8

3.5

3.1

Table 7.1 Technical data (cont.)

Operating Manual geoTHERM exclusive VWS 0020071929_0030

Appendix 7

7.2 Identification plate

An identification plate is attached to the baseplate on
the inside of the geoTHERM exclusive heat pump. The
type designation is located at the top of the front clad­ding (see Fig. 4.3, Item 2).

Vaillant GmbH Remscheid / Germany

Serial-No. 21054500100028300006000001N1

VWS 63/2 230 V

IT FR NO LV LT EE ES UK

IP 20

1/N/PE 230V 50Hz

1/N/PE 230V 50Hz

1/N/PE 230V 50Hz

6,8 kW

2,8 kW

2 / 4 kW

16 A

COP B0/W35
COP B5/W55

B0/W35
B5/W55

21054500100028300006000001N4

< 45 A

175 I

1 (10) MPa (bar)

R407 C
1,9 kg
2,9 (29) MPa (bar)

4,2

3,0

6,0 kW

6,3 kW

Explanation of the symbols on the identification plate

Rated voltage - compressor

Rated voltage - pumps + controller

Rated voltage - auxiliary heating

Rated maximum power

Rated power - compressor, pumps
and controller

Rated power - auxiliary heating

Start-up current without start-up
current limiter

16 A

COP B0/W35

COP B5/W55

B0/W35

B5/W55

Start-up current with start-up
current limiter

Service water tank capacity
Permissible rated overpressure
Coolant type
Filling quantity
Permissible rated overpressure

Performance figure at a brine
temperature of 0 °C and a heating
flow temperature of 35 °C

Performance figure at a brine
temperature of 5 °C and a heating
flow temperature of 55 °C

Thermal output with a brine
temperature of 0 °C and a heating
flow temperature of 35 °C

Thermal output with a brine
temperature of 5 °C and a heating
flow temperature of 55 °C

Fig. 7.1 Example of an identification plate

CE mark

VDE/GS mark

Read the Operating and Installation
Manual!

Humidity protection class

Ensure proper disposal at the end
of its useful life (not household
waste)

21054500100028300006000001N4

Serial Number

Table 7.2 Explanation of symbols

31Operating Manual geoTHERM exclusive VWS 0020071929_00

0020071929_00 GB 102008