Vaillant geoTHERM VWS User manual

geoTHERM
VWS/VWW
GB; ES

For the owner
Operating manual
geoTHERM
VWS/VWW
Heat pump
GB

Operating Manual geoTHERM VWS/VWW 0020051578_012
Contents
Contents
General information..................................................... 3
Data badge.............................................................................. 3
1 Information on this manual............................. 3
1.1 Other applicable documents .................................. 3
1.2 Storage of the documents...................................... 3
1.3 Symbols used ............................................................. 4
1.4 Applicability of the manual..................................... 4
2 Safety instructions .......................................... 4
2.1 Coolants....................................................................... 4
2.2 Prohibition on alterations....................................... 5
3 Equipment and functional description........... 5
3.1 Functional principle.................................................. 5
3.2 Operation mode of the coolant circuit................ 6
3.3 Automatic auxiliary functions................................ 6
3.4 Design of the heat pump......................................... 7
4 Notes on the installation and operation........ 8
4.1 Intended use............................................................... 8
4.2 Requirements of the installation site .................. 9
4.3 Accumulation of condensate
(condensation water)............................................... 9
4.4 Energy saving tips .................................................... 9
4.4.1 General energy saving tips..................................... 9
4.4.2 Economising by using the control
system correctly........................................................ 10
5 Operation ........................................................... 11
5.1 Familiarising yourself with and operating
the controller ............................................................. 11
5.2 Setting menus and parameters............................. 12
5.3 Description of the controller.................................. 12
5.3.1 Possible system circuits.......................................... 12
5.3.2 Energy balance controller ...................................... 13
5.3.3 Charging principle buffer cylinder........................ 13
5.3.4 Resetting to factory settings................................. 13
5.3.4 Controller structure ................................................. 13
5.3.5 Adjusting the energy saving functions................ 13
5.4 Flow diagram.............................................................. 14
5.5 Displays at user level............................................... 15
5.6 Installer Menu ............................................................ 21
5.7 Starting up the heat pump ..................................... 23
5.8 Shutting down the heat pump............................... 23
5.9 Inspection by a specialist engineer...................... 23
5.10 Inspection by the operator..................................... 23
5.10.1 Checking the filling pressure of the
heating system .......................................................... 23
5.10.2 Checking the filling level and filling pressure
of the brine circuit.................................................... 24
5.11 Cleaning and care .................................................... 24
5.12 Troubleshooting and diagnosis ............................. 25
5.12.1 Error messages on the controller......................... 25
5.12.2 Activating emergency mode.................................. 25
5.12.3 Errors/malfunctions that you can remedy......... 25
5.12.4 Warning messages.................................................... 25
5.12.5 Temporary malfunctions......................................... 26
5.12.6 Blocking error ............................................................ 26
6 Warranty and customer service ..................... 27
6.1 Vaillant warranty....................................................... 27
6.3 Vaillant Service.......................................................... 27
7 Appendix ............................................................ 28
7.1 Technical Data VWS ................................................. 28
7.2 Technical Data VWW ................................................ 29
7.3 Data badge.................................................................. 31

3Operating Manual geoTHERM VWS/VWW 0020051578_01
Data badge
The geoTHERM heat pump has an identification plate
which is mounted on the front face of the magnetic
steel sheet. The type designation is on the front clad-
ding at the top of the unit (also see Fig. 3.3, Pos. 1).
In the appendix to Chap. 7.3 there is a picture of an
identification plate for customers who are interested
in the technical aspects of the system, and also a table
explaining the symbols shown on it.
1 Information on this manual
This manual contains important information on how
to operate your heat pump safely and professionally.
1.1 Other applicable documents
Other applicable documents are all manuals that des-
cribe the operation of the heat pump, and the manuals
supplied with the accessories used.
1.2 Storage of the documents
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 docu-
ments to the buyer.
ABBA12-30-01ABBA12-30-01
L3L2L1
N
PEL3L2L1
N
PE
N
PEL2L1
L3
N
ABBA8-30-01
ABBA8-30-01
ABBA8-30-01
1
LLLLL1 LNNNN N 2N2121LN
2345SCH678ASB
NNAufZuL N 1212 12121212
DCFOTAF
-+
AufZu
ZH
NL
ZP
NL
SK2-P
NL
HK2-P HK2 VF2 RF1 VF1 SP BUS DCF/AF EVU 1xZPLP/UV1
ABBA12-30-01
Fig. 1.1 Removing the pillar cover
General information
Information on this manual 1
General information
Vaillant geoTHERM heat pumps are generally referred
to in this manual as heat pumps. This operating manual
is valid for the following variants:
Type name Article number
Brine/Water Heat Pumps
VWS 220/2 0010002797
VWS 300/2 0010002798
VWS 380/2 0010002799
VWS 460/2 0010002800
Water/Water Heat Pumps
VWW 220/2 0010002801
VWW 300/2 0010002802
VWW 380/2 0010002803
VWW 460/2 0010002804
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.
VDE and tested safety
With the CE mark, we confirm as equipment manufac-
turers that the appliances in the geoTHERM range satis-
fy the requirements of the Directive on Electromagnetic
Compatibility (Council Directive 89/336/EWG).
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 compres-
sors, heating, specifications for appliances for space
heating and for warming drinking water) as well as
EN 378 (safety and environmentally related specifica-
tions for refrigerating systems and heat pumps).
GB

Operating Manual geoTHERM VWS/VWW 0020051578_014
1.3 Symbols used
The following symbols are used in this operating manual
to denote levels of danger, information, activities and
energy-saving tips.
dDanger!
Immediate risk of serious injury or
death!
HDanger!
Danger of burning and scalding!
aCaution!
Potentially dangerous situation for the
product and environment!
hNote
Useful information and instructions.
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 manual applies exclusively to heat pumps with the
type designations listed in Table 0.1.
2 Safety instructions
Observe the following safety instructions and regula-
tions 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.
HDanger!
Risk of burning as a result of contact
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).
2.1 Coolants
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 nei-
ther a fire hazard nor an explosion risk.
a
Danger!
Environmental hazard!
This unit contains R 407 C coolant. The
coolant must not be allowed to escape
into the atmosphere. R 407 C is a fluori-
nated, chlorine-free greenhouse gas that
has been included in 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.
The relevant work in connection with the
coolant may only be carried out by offi-
cially certified specialists.
d
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 emana-
ting from leaks in the coolant circuit.
Avoid contact with the skin and eyes.
h
Note
R 407 C coolant presents no danger
during normal use and under normal
conditions. With improper use, however,
it can cause injury and damage.
1 Information on this manual
2 Safety instructions

5Operating Manual geoTHERM VWS/VWW 0020051578_01
If an external passive cooling system is installed in your
system:
a
Caution!
Danger of falling below the dew point and
condensate formation!
The heating flow temperature setting
must not be too low in cooling mode. The
cooling function is still effective with a
flow temperature of 20°C.
a
Caution!
The cooling function is impaired if the
thermostatic radiator valves are closed!
The thermostatic radiator valves must
be switched to the "open" position in
cooling mode to ensure that the cooled
heating water circulates smoothly
through the underfloor circuit.
2.2 Prohibition on alterations
d
Danger!
Inappropriate alterations can cause
injuries!
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.
The prohibition applies to:
— the heat pump,
— the vicinity of the heat pump,
— 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 compo-
nents.
3 Equipment and functional
description
3.1 Functional principle
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 heat pump uses geothermal
energy or ground water as its heat source.
3/4 Environmental energy 4/4 Heating energy
1/4 Electrical energy
Fig. 3.1 Use of geothermal energy or ground water as the heat
source
The system consists of separate circuits which are cou-
pled 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
circuit.
- 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 generation for the domestic hot
water cylinder.
Safety instructions 2
Equipment and functional description 3
GB

Operating Manual geoTHERM VWS/VWW 0020051578_016
3.2 Operation mode of the coolant circuit
Additional
heating
Domestic
hot water cylinder
Heating water circuit
Heat source circuit
Coolant circuit
Hot water
Cold water
Switching valve
Heating water pump
Condenser
Heat source
Brine pump
Evaporator Compressor
Expansion valve 2
1
3
4
Heating system
Fig. 3.2 Principle of operation of the heat pump
The coolant circuit is connected by means of the evapo-
rator (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 con-
denses.
As thermal energy can only pass from a body at a high-
er temperature to a body at a lower temperature, the
coolant in the evaporator must have a lower tempera-
ture 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.
These different temperatures are produced in the cool-
ant circuit by means of a compressor (2) and an expan-
sion valve (4) between the evaporator and condenser.
The coolant flows in vapour form from the evaporator
into the compressor, where it is compressed. This caus-
es 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 expan-
sion valve, where it expands significantly and in so doing
loses much of its pressure and temperature. This tem-
perature is now lower than that of the brine flowing
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 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. In the unlikely event that
condensate forms, this collects in a condensate pan in-
side the unit and is discharged under the unit where a
suitable condensate drain should be installed.
3.3 Automatic auxiliary functions
Frost protection
The controller is equipped with a frost protection func-
tion. This function ensures that your heating installation
is protected from frost in all operating modes.
The set-back temperature is pre-set automatically for
each heating circuit if the outside temperature falls
below 3°C.
Cylinder frost protection
This function starts automatically when the actual tem-
perature 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 hydraulic basic circuit given by you during commis-
sioning determines the required sensors. The heat pump
constantly checks automatically that all sensors are in-
stalled and functioning.
Protection from loss of heating water
An analogue pressure sensor monitors possible low
water pressure and switches the heat pump off if the
water pressure on the pressure gauge reads less than
0.5bar and switches it back on when the water pressure
is over 0.7bar on the pressure gauge.
Pump seizing and valve seizing protection
To prevent the heating, circulation or brine pumps, or
the hot water diverter valve UV1, from seizing, those
pumps and the valve that have not been in operation for
the last 24 hours are turned on in sequence for approxi-
mately 20 seconds every day.
Protection against loss of brine (VWS only)
An analogue pressure sensor monitors possible low
brine pressure and switches the heat pump off if the
brine pressure is ever less than 0.2bar on the pressure
gauge and error 91 is displayed on the error memory.
The heat pump switches on again when the brine pres-
sure rises above 0.4bar gauge pressure.
If the brine pressure drops below 0.6bar on the pres-
sure gauge for more than one minute a warning appears
in menu 1.
3 Equipment and functional description

7Operating Manual geoTHERM VWS/VWW 0020051578_01
Floor protection circuit for all hydraulics without
buffer cylinder (e.g. in hydraulic plans 1 and 3)
If the measured flow temperature in the underfloor
heating circuit continuously exceeds a specific value for
more than 15 minutes, the heat pump switches off and
issues the error message 72. When the heating flow
temperature falls below this value again and the error
has been reset the heat pump switches back on.
a
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.
Phase monitoring
The sequence and existence of phases (clockwise rotat-
ing field) on the 400V voltage supply are continuously
monitored during commissioning and operation. If the
sequence is not correct or if a phase breaks down, the
heat pump is switched off due to the error to avoid
damage to the compressor.
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 er-
rors 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.
For the geoTHERM VWW heat pumps a default value of
+4°C is set. This value cannot be changed.
3.4 Design of the heat pump
The types of heat pump available are listed below. The
heat pumps are, above all, different from each other in
their output.
Type name Heating output (kW)
Brine-to-water heat pumps (B0/W35) 1)
VWS 220/2 21.6
VWS 300/2 29.9
VWS 380/2 38.3
VWS 460/2 45.9
Water-water heat pumps (W10/W35) 2)
VWW 220/2 29.9
VWW 300/2 41.6
VWW 380/2 52.6
VWW 460/2 63.6
Table 3.1 Type summary
1)
Thermal heating output with a brine temperature of 0°C and
heating flow temperature of 35°C
2)
Thermal heating output with a water temperature of 10°C and
heating flow temperature of 35°C
2
1
3
Fig. 3.3 Front view VWS/VWW
Key to Fig. 3.3
1 Label with heat pump type designation
2 Operating panel
3 Serial number
Equipment and functional description 3
GB

Operating Manual geoTHERM VWS/VWW 0020051578_018
5
4
3
2
1
Fig. 3.4 Rear view VWS/VWW
Key to Fig. 3.4
1 Cable feedthrough for electrical connections
2 Heat source from the heat pump
3 Heat source to the heat pump
4 Heating return
5 Heating feed
4 Notes on the installation and
operation
dDanger!
Risk to life as a consequence of using
unqualified personnel!
Installation, inspection and repair may
only be carried out by a qualified engi-
neer. In particular, working on the elec-
trical components and on the coolant
circuit requires an appropriate qualifica-
tion.
4.1 Intended use
The Valliant geoTHERM heat pump has been built using
state-of-the-art technology in accordance with recog-
nised safety regulations. Nevertheless, there is still a
risk of injury or death to the user or others or of dam-
age 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 ca-
pacities 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 heat pump is designed to generate heat 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 lia-
ble for any resulting damage. The user alone bears the
risk.
Intended use also includes:
— observance of the operating and installation manual.
— observance of all other applicable documents.
— compliance with the inspection and care conditions.
d
Danger!
Danger of death due to improper use of
the system.
There is a risk of death or serious injury
to the user or others or of damage to the
unit and other property in the unit is im-
properly used or not used as intended.
3 Equipment and functional description
4 Notes on the installation and operation

9Operating Manual geoTHERM VWS/VWW 0020051578_01
4.2 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 frost-
proof.
4.3 Accumulation of condensate
(condensation water)
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 in the
unlikely event of a small amount of condensate forming,
this falls into an internal condensate pan in the bottom
section of the heat pump. As a result of the heat gener-
ated inside the heat pump, the condensate in the con-
densate pan evaporates. Small amounts of the accumu-
lating 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.
If an external passive cooling system is installed in your
system:
a
Caution!
Danger of falling below the dew point and
condensate formation!
The heating flow temperature setting
must not be too low in cooling mode. The
cooling function is still effective with a
flow temperature of 20°C.
4.4 Energy saving tips
Below you will find important tips to help you operate
your heat pump system in an energy and cost-saving
manner.
4.4.1 General energy saving tips
You can even save energy through your general actions:
—Ventilate correctly:
Do not leave windows or French doors tilted open.
Instead, open these wide 3 to 4 times a day for
15 minutes and turn down the thermostatic valves
or room thermostats while ventilating.
— Do not block the radiators:
this will allow the heated air in the room to circulate
more effectively.
— Use a ventilation system with heat recovery:
The optimum exchange of air in the building is always
guaranteed by using 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 ven-
tilation unit's remote control.
— Check that windows and doors are airtight:
Keep shutters and blinds closed at night, so that as
little heat as possible is lost.
— Do not cover controllers:
If a VR 90 remote control unit is installed as an acces-
sory, do not obstruct it with furniture, etc. as other-
wise it will not be able to record the circulating room
air as effectively.
— Awareness of water usage:
shower instead of bath, replace seals in dripping water
taps immediately, for example.
Notes on the installation and operation 4
GB

Operating Manual geoTHERM VWS/VWW 0020051578_0110
4.4.2 Economising by using the control system cor-
rectly
Further economies can be made by the correct use of
the control system on your heat pump.
A number of tips on how to make save energy by adjust-
ing your heat pump's control system are provided
below:
— Set the correct heating flow temperature:
Your heat pump not only controls the heating flow
temperature with reference to the outside tempera-
ture, it also controls the heating flow temperature
with reference to the room temperature you have set.
Therefore select a room temperature that is just suffi-
cient for your comfort, for example 20°C. Every de-
gree over and above that means an increase in energy
consumption of around 6% per annum.
— Select the appropriate heating curve:
If your heat pump is used to operate underfloor heat-
ing, you should specify a heating curve that is less
than 0.4. We recommend that radiator heating sys-
tems are configured in such a way that they can still
function effectively at extremely low outside tempera-
tures with a maximum flow temperature of 50°C; this
corresponds to heating curves of less than 0.7.
— Choose an appropriate hot water temperature set-
ting:
The hot water set target temperature you specify
should be just enough to satisfy your consumption
requirements and no higher. Any further heating
results in unnecessary power consumption, and hot
water temperatures of more than 60°C also lead to
increased lime scale production. We recommend that
hot water generation be achieved without the electric
auxiliary heating; by this method, the maximum hot
water 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
approx. 58°C.
— Setting of heating times that take individual re-
quirements into account:
Use the timer programs for heating and hot water. Set
the times on the basis of your typical daily routine and
corresponding heat demand.
— 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:
Through appropriate structuring of a heating pro-
gramme, you can arrange for all the rooms in your
house to be uniformly heated in accordance with your
pattern of use.
—Use thermostatic radiator 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).
— Optimise use of the circulation pump:
Adapt the operating times of the circulation pump to
actual requirements.
— Consult your expert technician:
He can adjust your heat pump installation to suit your
personal requirements.
You will find these and other energy saving tips in
Chap. 5.5. The controller settings that can potentially
save energy are described there.
4 Information on the installation and operation

11Operating Manual geoTHERM VWS/VWW 0020051578_01
5 Operation
5.1 Familiarising yourself with and operating the
controller
All programming of the heat pump is carried out by
means of the two dials ( and ) on the controller.
The dial is used to select the parameter (by pressing)
and to alter the parameter
(by turning). The dial is used to select the menu
(by turning) and to activate special functions (by press-
ing).
Basic data
Date
Day of week
Time
Set day
2
1
3
4
5
6
Fig. 5.1 Operating overview
Key
1 Menu name
2 Cursor indicates the selected parameter
3 menu number
4 Dial ,
position parameter (turn), select parameter (press)
5 Dial ,
select menu (turn), activate special operation (press)
6 Information line (in the example a handling request)
Typical operating process (operator level)
• Turn the dial
to select the required menu.
• Turn the dial
to select the parameter to be
modified.
• Press the dial to mark the
parameter to be modified. The
parameter background is
darkened.
• Turn the dial to modify the
parameter setting value.
• Press the dial to mark the
setting value to be accepted.
Operation 5
GB

Operating Manual geoTHERM VWS/VWW 0020051578_0112
5.2 Setting menus and parameters
setting to date modified setting
Holiday programming 6
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
select menu:
– Turn the dial: Select
menu e.g. from menu 6
to 7.
Basic data 7
Date >21.04.08
Day of
week Mo
Time 09:35
>Set day
Basic data 7
Date >21.04.08
Day of
week Mo
Time 09:35
>Set day
Select parameter:
•Turn the dial: select the
parameter to be modified,
e.g. from line 1 Day to line
2 Weekday (turn dial
through 3 further index
steps in this case).
Basic data 7
Date 21.04.08
Day of
week >Mon
Time 09:35
>Set weekday
Basic data 7
Date 21.04.08
Day of
week >Mon
Time 09:35
>Set weekday
Modify parameter weekday
from Monday to Tuesday:
– Push the dial:
Select parameter.
– Turn the dial:
Modify parameter.
– Push the dial:
Accept modification.
Basic data 7
Date 21.04.08
Day of
week >Tues
Time 09:35
>Set weekday
5.3 Description of the controller
The heating engineer will have set all the operating pa-
rameters 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.
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 mod-
ules 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.
5 Operation

13Operating Manual geoTHERM VWS/VWW 0020051578_01
5.3.2 Energy balance controller
The energy balance controller is only applicable to hy-
draulics without buffer cylinder.
For economical and fault-free operation of a heat pump,
it is important to regiment the starting of the compres-
sor. 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] = 1K temperature difference in
the supply from 1 Minute (K = Kelvin)
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 Charging principle buffer cylinder
The buffer cylinder is controlled depending on the set-
point flow temperature. The heat pump heats when the
temperature of the buffer cylinder head temperature
sensor VF1 is smaller than the set target temperature. It
heats until the temperature measured by the sensor at
the base of the buffer cylinder, RF1, has reached the set-
point temperature plus 2K.
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 2K higher
than the set target temperature (premature reheating):
VF1 < T VL set + 2K.
5.3.4 Resetting to factory settings
a
Caution!
Inadvertent deletion of specific settings!
When you reset the control system to
the default settings, specific system
settings can be deleted and the system
can shut down. The system does not
suffer damage.
• Press both dials simultaneously for at least 5 seconds
in the top-level display of the graphics display.
After that you can select whether to reset only the
timer programme or all values to the default settings.
5.3.4 Controller 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 parame-
ters 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 can obtain general information re-
garding the settings for the heat pump.
Menus A1 to A9 take the engineer through the installa-
tion 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 on how to activate the special
functions are given in Chap. 5.6.
The fourth level contains functions for the optimisation
of the system and can only be set by the engineer using
vrDIALOG 810/2.
5.3.5 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 can be
achieved by finding the optimum setting of the heat
pump's weather-controlled energy balance controller.
This symbol points you to these energy saving tips.
Operation 5
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Operating Manual geoTHERM VWS/VWW 0020051578_0114
5.4 Flow diagram
HK2
Parameter 2
Betriebsart Heizen
>Auto
15 ºC
Night set back temp.
20 ºC
Raumsolltemp.
HK2
Parameters 2
Heating mode
>Auto
15 ºC
Night set back temp.
20 ºC
Set value day
Mo 21.04.08
Flow Temp. CH
16:49
System pressure 1,2bar
1,4bar
Brine pressure
CH : Comp only
Warning message
Warning message
28ºC
1
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
We 16.02.08 9:35
Cooling function active for >3days
> Set duration
Cooling settings *
Domestic hot water
Parameters 4
Operation mode DHW > Auto 60 ºC
Max. DHW temp.
51 ºC
Current DHW temp.
44 ºC
Min. DHW temp.
HK2
Time programme 5
>Mo
1 00:00 24:00
3 : :
>Select day of the week
2 : :
HK2
Time programme 5
>Mo
1 00:00 24:00
3 : :
>Select day of the week
2 : :
HK2
Time programme 5
>Mo
1 00:00 24:00
3 : :
>Select day of the week
2 : :
Domestic hot water
Time programme 5
>Mo
1 06:00 22:00
3 : :
>Select day of the week
2 : :
Circulation pump
Time programme 5
>Mo
1 06:00 22:00
3 : :
>Select day of the week
2 : :
Holiday programming
for cpl. System 6
Periods
1 >06.01.08 08.01.08
12 ºC
Room Temp. setpoint
>Set starting day
2 14.01.08 31.01.08
Basic data 7
Day of week > Mo
Date 21.04.08
> Set day of the week
Time 09:35
Code layer 8
Code-Nummer:
> 0 0 0 0
1 0 0 0
>Adjust numeric character
Standard code:
We 16.02.08 9:35
Factory setting NO/YES
Cancel
Everything
> Select
Time programme NO/YES
NO/YES
Reset to default
settings
Graphics display
Energy input display
Installer Menu
Graphics display cooling*
Code level only for
expert technicians
> 5 sec.
>Select operation mode
>Select operation mode
Fig. 5.2 Displays at the user level
*) displays in grey may vary depending on the hydraulic plan set
5 Operation

15Operating Manual geoTHERM VWS/VWW 0020051578_01
5.5 Displays at user level
The individual displays on the operator control 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 dis-
play. This is always shown if you have not actuated either of the dials
for a long time while another display is showing.
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 10KW) 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 heat-
ing system.
>>> Right flashes when energy is being fed to the
heating system (e.g. only from the electric auxil-
iary heating).
The heat pump is in the CH mode. The heating
flow temperature is also displayed (30°C shown
in example).
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 dis-
played.
Only if cooling is installed and the corresponding
settings have been made by the expert techni-
cian at the heat pump controller:
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
Operation 5
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Operating Manual geoTHERM VWS/VWW 0020051578_0116
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, 4000kWh) adapts automatically to the
month's highest value.
Top right the total of the environmental yield since commissioning is
displayed (in the example: 13628kWh).
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: Heat source pressure (Pressure sensor for
heat source circuit; brine pressure)
Heating only comp.: this status message provides information on the
current operating status. The following are possible:
Heating only comp.
Heating comp & ZH
CH: ZH only
CH:Comp&aux off
WW:Comp&aux off
WW: Comp only
WW: ZH 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
Under critical operating conditions a warning message is displayed in
both lower display lines. These lines are empty when the operating
conditions are normal.
Table 5.1 Settable parameters in the operator level (contd.)
5 Operation

17Operating Manual geoTHERM VWS/VWW 0020051578_01
Display shown Description Factory setting
<HK2> 2
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-
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.
The following operating modes are available for
heating circuits:
Auto: The operation of the heating circuits alter-
nates 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 set-
back temperature regardless of any settable timer
programme.
Off: The heating circuit is off, provided that the frost
protection function (depending on the external tem-
perature) is not activated.
Note:
Additional heating circuits are displayed, depending
on the system configuration.
Room set target
temp.: 20°C
Set-back temp.:
15°C
Table 5.1 Settable parameters in the operator level (contd.)
Operation 5
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Operating Manual geoTHERM VWS/VWW 0020051578_0118
Display shown Description Factory setting
DHW loading 4
Parameters
Operating mode WW Auto
Max. DHW temp. 60°C
Min. DHW temp. 44°C
Cylinder temp. REAL 51°C
>Select set target temperature
For connected domestic hot water cylinders and the
circulation circuit the operating modes Auto, On and
Off are possible.
The maximum WW temperature determines the
temperature to which the domestic hot water cylin-
der 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 dis-
played when the auxiliary hot water heating is ena-
bled.
Without electric auxiliary heating, the WW tempera-
ture is limited by the pressure sensor control shut-
off 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 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 58°C. In order
to keep the heat pump starts to an absolute mini-
mum as low a min. hot water temperature as possi-
ble should be selected.
Min. hot water
temp. 44°C
<HK2> 5
Time programme
>Mon
1 00:00 24:00
2: :
3: :
>Select weekday/block
You can set the heating times for each heating cir-
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 tempera-
ture.
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 off-
peak 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.
Mon – Sun
0:00 – 24:00
Table 5.1 Settable parameters in the operator level (contd.)
5 Operation