Vaillant geoTHERM SERIES User manual

Installation instructions
For the heating engineer
GB
Installation instructions
geoTHERM
Heat pump

Contents
2Installation instructions geoTHERM 0020051574_04
Contents
1 Notes on the documentation .....................................4
1.1 Observing other applicable documents .....................4
1.2 Document storage ...........................................................4
1.3 Symbols used....................................................................4
1.4 Applicability of the instructions...................................4
1.5 CE label...............................................................................5
2 Safety instructions and regulations .......................6
2.1 Safety and warning information ..................................6
2.1.1 Classification of warnings..............................................6
2.1.2 Structure of warnings.....................................................6
2.2 Intended use......................................................................6
2.3 General safety instructions ...........................................6
2.4 Safety instructions regarding coolant........................7
2.5 Regulations, rules, guidelines .......................................8
3 Description of functions and units ..........................9
3.1 Identification plate...........................................................9
3.2 Functional principle....................................................... 10
3.3 Design of the heat pump................................................11
3.4 Optional accessories ......................................................13
4 Installation ......................................................................14
4.1 Requirements for the installation site.......................14
4.2 Requirements for the well water quality
(VWW only).......................................................................14
4.3 Dimensions and clearances..........................................16
4.4 Requirements for the heating circuit.........................17
4.5 Check the scope of delivery........................................ 18
4.6 Removing the transport locks .....................................19
4.7 Transporting the heat pump ...................................... 20
4.8 Installing the heat pump..............................................22
5 Hydraulics installation...............................................23
5.1 Installing the direct heating mode ............................24
5.1.1 Description of functions for the direct heating
mode .................................................................................24
5.1.2 Installation instructions................................................24
5.2 Installing the mixed circuit with buffer tank...........26
5.2.1 Description of functions for the heating mode
with mixed circuit and buffer tank ............................26
5.2.2 Installation instructions................................................26
5.3 Installing the direct heating mode and
DHW tank .........................................................................28
5.3.1 Description of functions for the direct
heating mode and DHW tank (domestic
hot water cylinder). .......................................................28
5.3.2 Installation instructions................................................28
5.4 Installing the mixed circuit with buffer tank and
DHW tank ........................................................................ 30
5.4.1 Description of functions for the heating mode
with buffer tank and DHW tank................................. 30
5.4.2 Installation instructions............................................... 30
5.5 Installing the mixed circuit with buffer tank,
DHW tank and external passive cooling
(VWS only) .......................................................................32
5.5.1 Description of functions for the heating mode
with buffer tank, DHW tank and external
passive cooling ...............................................................32
5.5.2 Installation instructions................................................32
5.6 Fitting the flexible connecting hoses....................... 34
5.7 Connect the heat pump to the heating circuit.......35
5.8 Connecting the heat pump to the brine circuit
(VWS only) .......................................................................35
5.9 Fitting the brine expansion tank in the brine
circuit (VWS only) ..........................................................36
5.10 Connecting the heat pump to the well water
circuit (VWW only).........................................................37
6 Filling the heating and heat source circuit........ 38
6.1 Filling regulations ......................................................... 38
6.2 Filling and bleeding the heating circuit....................39
6.3 Filling and bleeding the brine circuit
(VWS only) .......................................................................39
6.3.1 Preparing the filling procedure ..................................39
6.3.2 Filling and bleeding the outer part
of the brine circuit........................................................ 40
6.3.3 Filling and bleeding the inner part
of the brine circuit..........................................................41
6.3.4 Filling and bleeding the entire brine circuit
in one operation............................................................ 42
6.3.5 Building up pressure in the brine circuit................. 43
6.4 Filling the DHW tank, if required............................... 43
7 Electrical installation ................................................ 44
7.1 Observing the installation instructions................... 44
7.2 Electronic switchbox .................................................... 45
7.3 Connecting the electricity supply..............................47
7.3.1 Unblocked mains supply
(electric wiring diagram 1) .......................................... 48
7.3.2 Duel-circuit supply heat pump rate
(electric wiring diagram 2) ......................................... 49
7.3.3 Connecting the external heating circuit pump...... 50
7.3.4 Connecting the external well pump
(VWW only).......................................................................51
7.3.5 Connecting the external electric auxiliary
heater (optional) ............................................................52
7.3.6 Connecting the limit thermostat
(unblocked mains supply) ............................................53
7.3.7 Connecting a limit thermostat (dual-circuit
supply) ............................................................................. 54
7.3.8 Connecting external brine switch (VWS only) ....... 55
7.3.9 Connecting an external 3-way brine mixing
valve cooling (VWS only, for optional external
passive cooling)............................................................. 56
7.4 Controller PCB (overview)............................................57
7.5 Installing the supplied accessory.............................. 58
7.5.1 Installing the VR 10....................................................... 58
7.5.2 Installing the VRC DCF ................................................ 58
7.6 Installing accessories that are absolutely
necessary........................................................................ 59

Contents
3Installation instructions geoTHERM 0020051574_04
7.7 Installing optional accessories................................... 60
7.7.1 Installing VR 90............................................................. 60
7.7.2 Installing VR 60...............................................................61
7.8 Connecting an external boiler .....................................61
7.8.1 Connecting an external boiler with eBUS
interface ...........................................................................61
7.8.2 Connecting an external boiler without eBUS
interface ..........................................................................62
7.9 Fitting the cladding and the operating panel .........62
7.10 Installing vrnetDIALOG 840/2 and 860/2.............. 65
8 Start-up.......................................................................... 66
8.1 Carrying out the initial commissioning ................... 66
8.1.1 Selecting a hydraulic scheme .....................................67
8.1.2 Selecting the electric wiring diagram.......................67
8.1.3 Implementing the settings...........................................67
8.1.4 Checking and bleeding the brine circuit
(VWS only) .......................................................................67
8.1.5 Checking and bleeding the heating circuit............. 68
8.1.6 Bleeding the DHW tank, if required.......................... 68
8.2 Handing the heating installation over to the
operator........................................................................... 68
9 Adapting the appliance to the heating system 69
9.1 Operating modes and functions................................ 69
9.2 Automatic functions..................................................... 69
9.3 Settable functions...........................................................71
9.3.1 Settable functions at operator level ..........................71
9.3.2 Settable functions at code level..................................71
9.3.3 Additional functions via vrDIALOG............................72
9.4 Control principle.............................................................72
9.4.1 Possible heater system circuits..................................72
9.4.2 Energy balance control
(hydraulics diagram 1 or 3)..........................................73
9.4.3 Flow target temperature control
(hydraulics diagram 2, 4 or 10)...................................73
9.5 Controller structure.......................................................73
9.6 Resetting to factory settings ......................................74
9.7 Calling up Code level menus .......................................75
9.7.1 Menu C: Set parameters for the heating system ...76
9.7.2 Menu D: Carrying out diagnoses............................... 83
9.7.3 Menu I: Display general information........................86
9.7.4 Menu A: Calling up Installation Assistent ............... 88
9.8 Parameters which can only be set with
vrDIALOG .........................................................................93
10 Inspection and maintenance ................................... 96
10.1 Notes on inspection and maintenance .................... 96
10.2 Carrying out the inspection ....................................... 96
10.3 Carrying out the maintenance work........................ 96
10.4 Carrying out a restart and trial operation...............97
11 Fault diagnosis and rectification............................97
11.1 Fault types .......................................................................97
11.2 Faults in eBUS components........................................ 98
11.3 Faults with temporary warning ................................ 98
11.4 Fault with temporary switch-off................................ 99
11.5 Fault with permanent switch-off.............................. 102
11.6 Other errors/malfunctions......................................... 107
12 Recycling and disposal.............................................108
12.1 Disposing of the heat pump......................................108
12.2 Disposing of the packaging .......................................108
12.3 Disposing of brine fluid (VWS only).........................108
12.4 Arranging disposal of coolant...................................108
13 Customer service and guarantee..........................109
13.1 Vaillant warranty..........................................................109
13.2 Vaillant Service.............................................................109
14 Technical data ..............................................................110
14.1 Technical Data VWS......................................................110
14.2 Technical Data VWW .................................................... 113
15 Commissioning report ............................................... 115
16 Reference ....................................................................... 117
17 Appendix ....................................................................... 120
Index ......................................................................................... 128
Ground source heat pump commissioning checklist..... 130
Service record...............................................................................131

Notes on the documentation
4Installation instructions geoTHERM 0020051574_04
1
1 Notes on the documentation
The following instructions are intended to guide you
through the entire documentation. Other documents are
valid in connection with these installation instructions.
We accept no liability for any damage caused by failure to
observe these instructions.
1.1 Observing other applicable documents
>When installing the heat pump, you must observe all
installation instructions for parts and components of the
heating installation. These installation instructions are
included with the individual parts of the heating installa-
tion and any supplementary components.
You must also observe all operating instructions that
accompany the components of the heating installation.
1.2 Document storage
>Pass these installation instructions and all other applica-
ble documents and, if necessary, any required tools to
the system operator. The system operator will be respon-
sible for storing them so that the instructions and tools
are available when required.
1.3 Symbols used
The symbols used in the manual are explained below. Dan-
ger symbols for identifying dangers are also used in this
manual (¬Ch.2.1.1).
iSymbol denoting additional useful tips and
information
>Symbol for a required task
1.4 Applicability of the instructions
These installation instructions apply only for heat pumps
that have the following article numbers:
Type name Article number
Brine-Water Heat Pumps (VWS)
VWS 220/2 0010002797
VWS 300/2 0010002798
VWS 380/2 0010002799
VWS 460/2 0010002800
Water-Water Heat Pumps (VWW)
VWW 220/2 0010002801
VWW 300/2 0010002802
VWW 380/2 0010002803
VWW 460/2 0010002804
1.1 Type designations and article numbers
The 10-digit article number for the heat pump (this corre-
sponds to the 10 digits that come after the 7th digit of the
serial number) can be found on the sticker on the heat
pump or on the identification plate (¬Ch.3.1).

Notes on the documentation
Installation instructions geoTHERM 0020051574_04 5
1
1.5 CE label
The CE label shows that the appliances according to the
model overview comply with the basic requirements of the
following Directives of the Council:
– Directive 2004/108/EC of the council
“Directive about the electromagnetic compatibility” with
the limit class B
– Directive 2006/95/EC of the council
“Directive about electrical equipment designed for use
within certain voltage limits” (Low voltage directive)
The heat pumps comply with the design described in the EC
type examination certificate.
The heat pumps comply with the following standards:
– DIN EN 55014-1:2007 - 06, -2:2002 - 08
– DIN EN 61000-3-2:2007-05, -3-3:2009-06,
-3-12:2005 - 09
– DIN EN 60335-1:2007, -2-40:2006 - 11,
-2-34:2003 - 09, Corrigenda 1:2004:10,
-2-34/ A1:2006 - 03, -2-51:2005 - 05, -3-11:2001 - 04,
-4-2:2009-12, -4-3:2008-06, -4-4:2005-07,
-4-5:2007-06, -4-11:2005-02
– DIN EN 60529:2000 - 09,
– DIN EN 50366:2006 - 11
– EN 50106:1997
– EN 378:2000
– EN 12735-1:2001
– EN 14276-1:2006,
– EN 12263:1998, -2:2007
– EN 12102:2008
– EN 14511:2007
– EN ISO 9614-1:1995, -2:1996, -3:2002
–ISO5149
The CE declaration of conformity can be accessed from the
manufacturer and can be provided as required.

6Installation instructions geoTHERM 0020051574_04
a
Safety instructions and regulations
a2
2 Safety instructions and regulations
2.1 Safety and warning information
The appliance may only be installed by a competent person
approved at the time by the Health and Safety Executive.
We accept no liability for any damage caused by failure to
observe these instructions.
>When installing the geoTHERM heat pump, observe the
general safety and warning information that may appear
before an action.
2.1.1 Classification of warnings
The following danger signs and signal words are used to
classify the warning notes in accordance with the severity
of the possible danger:
Danger sign Signal word Explanation
aDanger!
Immediate danger to life
or
risk of severe personal
injury
eDanger!
Danger of death from
electric shock
aWarning!
Danger of slight
personal injury
bCaution!
Risk of material or envi-
ronmental damage
2.1 Meaning of danger signs and signal words
2.1.2 Structure of warnings
Warning signs are identified by an upper and lower separat-
ing line and are laid out according to the following basic
principle:
aSignal word!
Type and source of danger!
Explanation of the type and source of dan-
ger.
>Measures for averting the danger
2.2 Intended use
Vaillant geoTHERM heat pumps are state-of-the-art units
which are designed in accordance with recognised safety
regulations. Nevertheless, there is a risk of death or serious
injury to the operator or others or of damage to the units
and other property in the event of improper use or use for
which they are not intended.
This unit is not intended for use by persons (including chil-
dren) with physical, sensory or mental impairments or who
have inadequate experience and/or knowledge, unless they
are supervised by a person responsible for their safety or
have been given instructions by this person regarding the
operation of the unit.
Children must be supervised to ensure they do not play
with the unit.
Vaillant geoTHERM heat pumps are intended exclusively for
domestic use.
The units are intended for use as heating units for closed
wall and underfloor heating systems, for DHW loading and
for optional external cooling.
The units are intended for operation on a power supply net-
work that has a specific minimum network impedance Zmin
at the interconnection point (household connection)
(¬Ch.14.)
Any other use, or use beyond that specified, shall be con-
sidered improper use. Any direct commercial or industrial
use is also deemed as improper. The manufacturer/supplier
is not liable for any damage resulting from improper use.
The user alone bears the risk.
Intended use includes the following:
– observance of accompanying operating, installation and
maintenance instructions for Vaillant products as well as
for other parts and components of the system
– installing and fitting the boiler in accordance with the
boiler and system approval
– compliance with all inspection and maintenance condi-
tions listed in the instructions.
Improper use of any kind is prohibited!
2.3 General safety instructions
The heat pump must only be installed by a qualified compe-
tent person. The competent person is also responsible for
complying with the existing directives, regulations and
guidelines.
Observe the following safety instructions and regulations
when installing the --geoTHERM heat pump:
>Carefully read through these installation instructions
>Carry out the activities that are described in these instal-
lation instructions.
Preventing explosions and burns
The brine fluid ethanol is extremely flammable, both as liq-
uid and steam. A potentially explosive combination of
steam/air may accumulate.

Installation instructions geoTHERM 0020051574_04 7
aSafety instructions and regulations a
2
>Keep away from heat, sparks, naked flames and hot sur-
faces.
>Ensure that there is sufficient ventilation in the event of
accidental release.
>Avoid the accumulation of steam/air mixtures. Keep
brine fluid containers closed.
>Observe the safety data sheet that accompanies the
brine fluid.
The components of the heat pump can reach high tempera-
tures.
>Do not touch any uninsulated pipelines in any part of the
heating installation.
>Do not remove any cladding parts.
Preventing electric shocks
>Always switch off all power supplies at all poles before
carrying out any electrical installation or servicing work.
>Check that there is no voltage.
>Make sure that they are secured against inadvertent
switching on again.
Preventing chemical burns
Brine fluids are harmful to health.
>Avoid contact with the skin and eyes.
>Do not inhale or swallow.
>Always wear gloves and protective goggles.
>Observe the safety data sheet that accompanies the
brine fluid.
Preventing damage
Unsuitable frost or corrosion protection agents may dam-
age seals and other components of the heating
circuit and may therefore also cause leaks in the water out-
let.
>Only add permitted frost or corrosion protection agents
to the heating water
VWW only:
If the water is of poor quality, this may lead to damage to
the suction well, the pipes and the evaporator in the water
pump.
>Check that the quality level of the water that is drawn in
is sufficient.
VWS only:
Frost may cause damage to seals and other components of
the brine circuit.
>Add permitted frost protection agents that ensure frost
protection up to - 15 °C to the brine fluid (¬Ch.6.3).
If external passive cooling is installed:
If the pipes of the heating circuit are not sufficiently insu-
lated and if the flow temperatures are below 20 °C, this
may cause the cooling to fall below the dew point and may
lead to condensation forming.
>Insulate all of the pipes in the heating circuit using
vapour diffusion-tight insulation.
>Do not set the heating flow temperature too low during
cooling.
During cooling, condensation forms on the radiators and
their supply lines and this causes mould to form and struc-
tural damage.
>Do not install the geoTHERM heat pumps with external
passive cooling in heating installations that have radia-
tors.
iUsing surface collectors disrupts the cooling
function.
When using a Vaillant heat pump with external
passive cooling, ground sensors must be used.
Preventing environmental hazards (VWS only)
The brine fluid that is contained in the heat pump must not
reach the drainage system, surface water or groundwater.
>Dispose of the brine fluid that is in the water pump in
compliance with local regulations.
2.4 Safety instructions regarding coolant
Preventing freezing
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.
With normal use and normal conditions, the coolant
R 407 C poses no risk. However, damage may occur in the
event of improper use.
Escaping coolant can cause freezing if the exit point is
touched:
>If coolant escapes, do not touch any components of the
heat pump.
>Do not inhale any steam or gases that escape from the
coolant circuit as a result of leaks.
>Avoid skin and eye contact with the coolant.
>In the event of skin or eye contact with the coolant, seek
medical advice.
Preventing environmental hazards
The heat pump contains the coolant R407C. The coolant
must not be allowed to escape into the atmosphere. R407C
is a fluorinated greenhouse gas covered by the Kyoto Proto-
col, with a GWP of 1653 (GWP = Global Warming Potential).
If it escapes into the atmosphere,
its impact is 1653 times stronger than the natural green-
house gas CO2.
Before disposing of the heat pump, the coolant that is con-
tained in the heat pump must only be drained via service
valves into a recycling cylinder. In the case of service work,
new coolant (for the quantity, see the identification plate)
(¬Ch.3.1) must only be poured in via service valves. If an
approved replacement coolant other than the R 407 C that
is recommended by Vaillant is poured in, not only do all
guarantees lose their validity, but the operational safety can
also not be guaranteed.

8Installation instructions geoTHERM 0020051574_04
a
Safety instructions and regulations
a2
>Ensure that only officially-certified specialists with
appropriate protective equipment perform maintenance
work or access the coolant circuit.
>The coolant in the heat pump must only be recycled or
disposed of by certified specialists in accordance with
the regulations.
2.5 Regulations, rules, guidelines
As part of the installation, commissioning and operation of
the heat pump and the DHW storage you must take into
account the current versions of the following regulations or
standards, along with any local directives or guidelines that
may apply.
– Electricity at work act.
– Health and safety at work act
– Relevant Utility supplier’s regulations.
– Water regulations and by-laws.
– Environment agency and local council requirements
regarding bore holes, water courses, or noise levels.
– Gas safety installation and use regulations concerning
any associated gas fired heat source used within the
heating system.
– Building regulations part „L“ and directives concerning
energy saving
– Building regulations such as G3 covering Hygiene and L8
Legieonella.
– COSHH regulations
– Other relevant bodies such as HETAS and OFTEC

Description of functions and units
Installation instructions geoTHERM 0020051574_04 9
3
3 Description of functions and units
3.1 Identification plate
On the geoTHERM heat pump, an identification plate is
affixed to the front of the frame You can read the type des-
ignation of the heat pump from the sticker (1) (¬Fig.3.3)
on the bottom-right of the front cladding and on the identi-
fication plate.
R407 C
COP B0/W35 4,3
COP B5/W55 3,3
B0/W35
B5/W55
3/N/PE 400V 50Hz
IP 20
Vaillant GmbH Remscheid / Germany
1/N/PE 230V 50Hz
3/N/PE 400V 50Hz
10 kW
10 kW
-- kW
99 A
< 44 A
4,1 kg
2,9 (29) MPa (bar)
21,6 kW
23,0 kW
VWS 220/2
Serial-No. 21054500100027970006000001N1
21054500100028300006000001N4
44 A
3.1 Example of an identification plate (VWS)
Explanation of the symbols on the identification plate
Rated voltage - compressor
Rated voltage - pumps + controller
Rated voltage - auxiliary heater
Rated maximum power
Rated power - compressor, pumps
and controller
Rated power - auxiliary heater
Start-up current without in-rush
current limiter
44 A Start-up current with in-rush cur-
rent limiter
Coolant type
Filling quantity
Permissible rated overpressure
COP B0/W35
Output figure (Coefficient of Per-
formance) at a brine temperature
of 0 °C and heating flow tempera-
ture of 35 °C
COP B5/W55
Output figure (Coefficient of Per-
formance) at a brine temperature
of 5 °C and heating flow tempera-
ture of 55 °C
B0/W35 Thermal heating output at a brine temperature of 0 °C and a heating
flow temperature of 35 °C
B5/W55 Thermal heating output at a brine temperature of 5 °C and a heating
flow temperature of 55 °C
CE mark
VDE/GS mark
Read the operating and installa-
tion instructions.
VDE mark for electromagnetic
compatibility
IP 20 Type of protection against contact
and moisture (IP 20)
At the end of its useful life, dis-
pose of it properly and according
to regulations (not household
waste)
Serial Number
3.1 Symbol explanations

Description of functions and units
10 Installation instructions geoTHERM 0020051574_04
3
3.2 Functional principle
The Vaillant geoTHERM heat pump VWS uses geothermal
heat as its heat source, whereas the geoTHERM heat pump
VWW uses well/groundwater.
Electric
auxiliary
heater Domestic
hot water
tank
Heating circuit
Brine circuit/well water circuit
Coolant
circuit
Domestic
hot water
Cold water
Heating/cylinder
charging
diverter valve
Condenser
Heat source
Brine pump/
Well pump
Evaporator
Compressor
Expansion
valve
2
1
3
4
Heating
installation
3.2 Principle of operation of the heat pump
The heat pump consists of separate circuits which are cou-
pled with one another by means of heat exchangers. These
circuits are:
– The brine circuit with which the thermal energy is trans-
ferred from the heat source to the coolant circuit.
– The coolant circuit, which releases the thermal energy to
the heating circuit by means of evaporation, compres-
sion, liquefaction and expansion.
– The heating circuit, which supplies the heating and DHW
loading for the domestic hot water cylinder.
The evaporator (1) is used to connect the coolant circuit to
the geothermal heat source, from which it extracts thermal
energy. At the same time, the physical state of the coolant
changes; it evaporates. The condenser (3) is used to con-
nect the coolant circuit to the heating installation, to which
it releases the thermal energy again. In so doing, the cool-
ant 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
geothermal heat source. On the other hand, the tempera-
ture of the coolant in the condenser must be higher than
that of the heating water in order to be able to release the
thermal energy to it.
These different temperatures are produced in the coolant
circuit by means of a compressor (2) and an expansion
valve (4) between the evaporator and condenser. The cool-
ant flows in vapour form from the evaporator into the com-
pressor, where it is compressed. This causes the pressure
and temperature of the coolant vapour to rise sharply. After
this process, the coolant flows through the condenser,
where it releases its thermal energy 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 brine/well water flowing through the
evaporator. The coolant can thus take up more thermal
energy in the evaporator, turning into vapour in the process
and flowing to the compressor. The cycle starts again.
If required, an external electric auxiliary heater can be
switched on by the integrated controller.
To prevent condensation from forming inside the unit, the
cables of the brine circuit/well water circuit and the coolant
circuit must be cold insulated. If condensation still occurs,
(7) ¬Fig.3.5 and ¬Fig.3.6 are collected in a condensate
pan and guided under the heat pump. Drop formation under
the heat pump is thus possible.
The geoTHERM heat pump VWS can be equipped with
external passive cooling in order to provide for comfortable,
cool room temperatures in your living rooms at high out-
side temperatures during the summer operation. For this
purpose, additional components are required in the heat
pump hydraulics. An auxiliary cooling heat exchanger, an
additional mixer valve and an auxiliary diverter valve.
In the case of Vaillant heat pumps with cooling function, the
principle of “passive” cooling is applied, in which thermal
energy is transported via underfloor heating from the
rooms to the ground without compressor operation and
therefore without coolant circuit operation. The heating
water, which when supplied is colder than the room temper-
ature, absorbs thermal energy from the rooms and is
pumped via the heating circuit pump into the cooling heat
exchanger. The brine pump also conveys the colder brine
from the ground into the heat exchanger of the brine cir-
cuit, which is operated using the counter flow principle. In
the process, the warmer heating return emits thermal
energy to the colder brine circuit, so that the brine which is
heated to some degree is guided again to the floor. The
annealed heating flow circulates again through the circuit
of the underfloor heating, where the water can reabsorb
thermal energy from the surroundings. The cycle starts
again.

Description of functions and units
Installation instructions geoTHERM 0020051574_04 11
3
3.3 Design of the heat pump
The Vaillant geoTHERM heat pump is available in the types
listed below.
Type name Heating output (kW)
Brine-Water Heat Pumps (VWS) B0/W35 DT 5K
VWS 220/2 21.6
VWS 300/2 29.9
VWS 380/2 38.3
VWS 460/2 45.9
Water-Water Heat Pumps (VWW) W10/W35 DT 5K
VWW 220/2 29.9
VWW 300/2 41.6
VWW 380/2 52.6
VWW 460/2 63.6
3.2 Type overview
The heat pump can be operated at any normal electrical
supply tariff.
3
2
1
3.3 Front view
Key
1 Sticker with the heat pump type designation
2 vrnetDIALOG mounting plate (behind the cover column)
3 Operating panel
1
3
2
5
4
3.4 Rear view
Key
1 Cable feedthrough for electrical connections
2 From the heat pump to the heat source
(cold brine/well water)
3 From the heat source to the heat pump
(warm brine/well water)
4 Heating return
5 Heating flow

Description of functions and units
12 Installation instructions geoTHERM 0020051574_04
3
Assemblies
3
2
1
5
6
4
7
9
8
12
13
11
10
3.5 Front view when open (VWS)
Key
1 Electrical connections:
2 In-rush current limiter
3 Circuit breakers
4 Identification plate
5 Compressor
6 Expansion valve
7 Condensate pan
8 Brine circuit filling and emptying valve
9 Brine pump
10 Filter drying cartridge
11 Condenser
12 Evaporator
13 Controller PCB (under cover plate)
iSome components, such as heating circuit pump,
3-way valves or electrical auxiliary heater, are
integrated into the VWS and VWW geoTHERM
heat pumps, but these must be placed on-site
and installed externally.
5
6
4
3
2
1
7
9
8
12
13
11
10
3.6 Front view when open (VWW)
Key
1 Electrical connections:
2 In-rush current limiter
3 Circuit breakers
4 Identification plate
5 Compressor
6 Expansion valve
7 Condensate pan
8 Brine circuit filling and emptying valve
9 Flow switch
10 Filter drying cartridge
11 Condenser
12 Evaporator
13 Controller PCB (under cover plate)

Description of functions and units
Installation instructions geoTHERM 0020051574_04 13
3
3.4 Optional accessories
You can use the following Vaillant units to enhance the heat
pump system. Further information about installing Vaillant
units is available in ¬Ch.7.7.
VR 60 mixer module
With the mixer module, you can expand the control system
of the heating installation by two mixed circuits. You can
connect a maximum of six mixer modules.
VR 90 Remote control unit
You can connect a separate remote control unit for the first
six heating circuits (CH 4 – CH 15).
VR 10 standard sensor
Depending on the system configuration, additional sensors
may be required, for example, as supply, return, collector or
tank sensors.
vrDIALOG 810/2
vrDIALOG is a communications unit with software and a
connecting cable that provide the option to diagnose, moni-
tor and set parameters for the heat pump on-site from a
computer.
vrnetDIALOG 840/2, 860/2
The vrnetDIALOG communications unit provides the option
to carry out remote diagnosis, monitoring and to set param-
eters from one computer via a telephone connection or an
integrated GSM modem, irrespective of your current loca-
tion.
VPS heating water buffer tank
The VPS buffer tank is used as an intermediate cylinder for
heating water and can be installed between the heat pump
and the heating circuit. It provides the energy that is
required to bridge any idle periods from the power com-
pany.
VIH and VDH domestic hot water cylinder
The Vaillant VIH coiled tube tank and the Vaillant VDH dou-
ble wall tank are specially designed to be combined with
heat pumps and are used for heating and storing hot water.
VPS /2 buffer tank
The VPS /2 buffer tank (available as an option with VPM-W
fresh water unit or VPM-S solar charging unit) is used as
temporary storage for heating water and can be fitted
between the heat pump and the heating circuit. It provides
the thermal energy that is required to bridge any idle peri-
ods from the power company.
Other accessories that are available from Vaillant
– Brine concentrate
– Filling pump for brine circuit
– Heat pumps for brine filling unit
Other accessories
– Safety group and drain pipe for heating circuit
– Expansion vessel for heating circuit
– Expansion vessel for hot water circuit
– Expansion vessel for brine circuit

Installation
14 Installation instructions geoTHERM 0020051574_04
4
4 Installation
4.1 Requirements for the installation site
>Choose a dry room that is frost-proof and where the
temperature does not fall below 7 °C and does not
exceed a maximum of 25 °C.
>Note that the installation room must have a minimum
volume. In accordance with DIN EN 378 T1, the minimum
size of the installation room (Vmin) for heat pumps is cal-
culated as follows:
Vmin = G/c
G = coolant filling quantity in kg
c = practical limit value in kg/m3
(for R 407 C, c = 0.31 kg/m3)
This therefore results in the following minimum installa-
tion space:
Heat pump type Coolant filling
quantity [kg] Minimum installa- tion space [m3]
VWS 220/2
VWW 220/2 4.1 4.3 13.2 13.9
VWS 300/2
VWW 300/2 5.99 19.3
VWS 380/2
VWW 380/2 6.7 21.6
VWS 460/2
VWW 460/2 8.6 27.7
4.1 Minimum size of the installation space for the heat pump
>Ensure that the required minimum clearance can be
maintained.
>When selecting the installation site, you must take into
consideration that when the heat pump is in operation, it
will carry vibrations over to the floor and the nearby
walls.
>Ensure that the floor is level and offers sufficient bearing
capacity to be able to bear the weight of the heat pump,
including a hot water tank and, if required, a filled buffer
tank that is ready for use.
>Ensure that cables can be easily run (for brine, well
water, hot water and heating).
bCaution!
If an unsuitable heating type is used dur-
ing cooling, there is a risk of damage
posed by a build-up of condensation.
During cooling, condensation forms on the
radiators and their supply lines and this
causes mould to form and structural dam-
age.
>Do not install the geoTHERM heat pumps
with external passive cooling in heating
installations that have radiators.
iTake the cooling into consideration when using
surface collectors.
When using a Vaillant heat pump with external
passive cooling, a ground sensor must be used.
4.2 Requirements for the well water quality
(VWW only)
bCaution!
Risk of damage from unsuitable well
water.
Deposits caused by using unsuitable well
water may damage the suction well, the
pipes and the evaporator. Using water that
contains salt is not permitted.
>Before installing the unit, check that the
quality level of the water that is drawn in
is sufficient.
If the heat pump must be installed directly in the well water
circuit, irrespective of the legal requirements, a water anal-
ysis must be carried out in accordance with the following
table for evaluating the quality of the well water
(¬Tab.4.2) and you must decide whether the well water
can be used as a heat source. The table is to be used as a
guide and does not claim to be complete. If the well water is
not of a sufficient quality, you must use a brine-water heat
pump (VWS) that has an intermediate heat exchanger that
must be installed on-site (¬ geoTHERM planning informa-
tion).
As limit values, the values for “copper” prevail because the
heat pump contains a copper-soldered stainless steel plate-
type heat exchanger. If the property “¯” (unsuitable)
appears in the “Copper” column or if the property “à”
appears three times, direct operation is not permitted. In
this case, an intermediate circuit (with brine-water heat
pump and intermediate heat exchanger) must be installed.
If a screwed stainless steel heat exchanger (material 1.4401)
is used as an intermediate circuit, the limit values for
“Stainless Steel” in the table apply. If the property “¯”

Installation
Installation instructions geoTHERM 0020051574_04 15
4
(unsuitable) appears in the “Stainless Steel” column or if
the property “à” appears three times, operation with an
intermediate circuit is not permitted.
When water from lakes and ponds is used, an intermediate
circuit must always be installed. The intermediate circuit
must be filled with brine fluid (30 % mixture).
Water components Concentration
in mg/l Copper Stainless steel
(1.4401)
Iron, dissolved
Fe ** < 0.2 > 0.2 ¨
¯**
¨
¨
Manganese, dissolved
Mn ** < 0.1 > 0.1 ¨
¯**
¨
¨
Aluminium, dissolved
Al < 0.2 > 0.2 ¨
à
¨
¨
Hydrogen sulphide
H2S< 0.05
> 0.05 ¨
¯
¨
¨
Sulphide
SO3
< 1 ¨¨
Chlorine gas, free
Cl2
< 0.5
0.5 - 5
> 5
¨
à/¯
¯
¨
¨
à/¯
Ammonia
NH3
< 2
2 - 20
> 20
¨
à
¯
¨
¨
¨
Carbonic acid,
free aggressive
CO2
< 5
5 - 20
> 20
¨
à
¯
¨
¨
¨
Oxygen
O2
< 2
> 2 ¨
à
¨
¨
Sulphate
[SO4]2- < 70
70 - 300
> 300
¨
à/¯
¯
¨
¨
¯
Hydrogen carbonate
HCO3-< 70
70 - 300
> 300
à
¨
à
¨
¨
¨
Ratio
HCO3-/[SO4]2- <1.0
>1.0 à/¯
¨
¨
¨
Chloride
Cl-< 300
> 300 ¨
à
¨
à
Nitrate, dissolved
NO3
< 100
> 100 ¨
à
¨
¨
Optical characteris-
tics *** Limit value Clear, colour-
less
Clear,
colour-
less
Water
overall hardness 4.0 - 8.5 °dH ¨¨
pH value < 6.0
6.0 - 7.5
7.5 - 9.0
> 9.0
à
à
¨
à
à
à/¨
¨
¨
Electrical conductivity
(at 20 °C) <10 mS/cm
10 - 500 mS/cm
>500 mS/cm
à
¨
¯
¨
¨
¨
4.2 Well water quality limit values
¨= Resistance normally good
à= Danger of corrosion; if several criteria are rated with à: critical
¯=unsuitable
**)To prevent the sedimentation of iron ochre, especially in the
absorbing well, a limit value of < 0.2 mg/litre for iron (Fe) and
<0.1 mg/litre for manganese (Mn) must be observed.
***) Cloudiness or settleable substances must not be present in the
groundwater, irrespective of the statutory regulations.
Extremely fine dirt particles that lead to clouding of the water
also cannot be eliminated by filters. They may therefore accu-
mulate in the evaporator and adversely affect the heat transfer
performance.

Installation
16 Installation instructions geoTHERM 0020051574_04
4
4.3 Dimensions and clearances
304110 110
141
1099
760
1200
760
1100
915
4.1 Dimensions and clearances
1) Adjustable feet adjustable in height by 10 mm

Installation
Installation instructions geoTHERM 0020051574_04 17
4
300 mm
300 mm
300 mm
600 mm
100 mm
4.2 Minimum clearances for installing the heat pump
160
470
4.3 Arrangement of the flexible hoses
>Plan the exact installation site of the geoTHERM heat
pump and the pipe installation in such a way that the
supplied flexible connecting hoses can be connected to
the vibration isolation.
4.4 Requirements for the heating circuit
Only for installed external passive cooling:
bCaution!
In the heating mode, there is a risk of
damage caused by the temperature fall-
ing below the dew point and by a build-up
of condensation.
All pipes in the heating circuit must be pro-
vided with vapour diffusion-tight insulation.
Radiator heating is not suitable for the
cooling with a Vaillant geoTHERM heat
pump.
>Insulate all of the pipes in the heating
circuit using vapour diffusion-tight insu-
lation.
bCaution!
In the cooling mode, there is a risk of
damage caused by the temperature fall-
ing below the dew point and by a build-up
of condensation.
Adequate cooling function is also guaran-
teed in a flow temperature of 20 °C.
>Do not set the heating flow temperature
too low during cooling.
The heat pump is only suitable for connection to a closed
central heating installation. To ensure that the unit oper-
ates smoothly, the central heating installation must be set
up by authorised specialists in compliance with the applica-
ble regulations.
A heat pump is suited to low temperature heating systems.
For this reason, the heating installation must be designed to
reach low flow temperatures (ideally approx. 30-35 °C). In
addition, you must ensure that idle times from the power
company are taken into consideration.
To prevent energy losses and to protect against freezing, all
supply lines must have thermal insulation.
The pipelines must be free from contamination.
>If required, clean the pipelines thoroughly before filling
them.

Installation
18 Installation instructions geoTHERM 0020051574_04
4
bCaution!
There is a risk of damage due to unsuita-
ble frost and corrosion protection agents.
Unsuitable frost or corrosion protection
agents may damage seals and other com-
ponents and may therefore also cause leaks
in the water outlet.
>Only add permitted frost or corrosion
protection agents to the heating water
For heating installations that are overwhelmingly fitted with
thermostatically or electrically controlled valves, you must
ensure that the flow through the heat pump is continuous
and sufficient. Irrespective of the choice of heating installa-
tion, the rated volume flow of heating water (¬Tab.14.1 or
¬Tab.14.2)must be guaranteed.
4.5 Check the scope of delivery
1
2
3
7
8
5
4
6
14
13
10
12
11
9
4.4 Check the scope of delivery.
For the key, see tab. 4.3
The heat pump is delivered on a pallet and consists of three
packing units.
>Check the heat pump and the operating panel that is
packed separately for any damage caused in transit.

Installation
Installation instructions geoTHERM 0020051574_04 19
4
Item. Number Description
1 1 Heat pump
12 2 Installation instructions, operating
instructions
2 2 Left and right side parts
Together in one box:
3 1 Operating panel, cover column
5 1 6-litre brine expansion tank, max. 300kPa
(3bar)
Together in one large bag:
4 1 Clamp for fastening the brine expansion
tank
11 1 Expansion relief valve for brine circuit,
1/2", 300kPa (3 bar)
6 1 VRC DCF radio clock signal receiver with
external sensor
7 4 VR 10 sensors
9 1 Control cable for vrnetDIALOG
10 1 Bag of small parts for fastening the brine
expansion tank
2 M6 flat-head screws for fitting the operat-
ing panel on the mounting plate
2 Tapping screws for the operating panel
mounting plate
4 Flat-head screws for fixing the side parts
to the frame
Together in one box:
8 4 Flexible connecting hoses (600 mm long,
heat source-side each with 1 1/2" inside
thread)
13 8 Bag with seals for connecting hoses for
the heating circuit (grey) and the brine/
well water circuit (yellow/green)
14 4 Lower and upper front cladding, front and
rear cover
4.3 Scope of delivery
4.6 Removing the transport locks
4.5 Removing the transport locks
>Carefully remove the packaging and padding without
damaging the parts of the unit.
>Remove the transport locks with which the heat pump is
fixed to the pallet.
>Dispose of the transport locks correctly. These are no
longer required.

Installation
20 Installation instructions geoTHERM 0020051574_04
4
4.7 Transporting the heat pump
aDanger!
Risk of injury from lifting a heavy weight.
The heat pump weighs up to 420 kg.
>Only use one of the following specified
modes of transport.
bCaution!
Risk of damage due to improper trans-
portation.
Regardless of the mode of transport, the
heat pump must never be tilted by more
than 45°. Otherwise, this may lead to mal-
functions in the coolant circuit during sub-
sequent operation. In the worst case sce-
nario, this may lead to a fault in the whole
heating installation.
>During transport, tilt the heat pump to a
maximum angle of 45°.
bCaution!
Risk of damage due to unsuitable trans-
portation.
Ensure that the mode of transport that you
select is designed to match the weight of
the heat pump.
>You can find out the weight of the heat
pump from the technical data (¬Tab. 14.1
or ¬Tab.14.2).