Vaillant aroSTOR VWL BM 200/5 User manual

Operating instructions
aroSTOR
VWL BM 200/5
VWL BM 270/5
KOsq
Publisher/manufacturer
Vaillant GmbH
Berghauser Str. 40 D-42859 Remscheid
Tel. [phone] Fax [phone]
[email protected] www.vaillant.de

Contents
2Operating instructions aroSTOR 0020290841_00
Contents
1 Safety ............................................ 4
1.1 Action-related warnings ................. 4
1.2 Intended use .................................. 4
1.3 Danger caused by improper
operation........................................ 5
1.4 Risk of death caused by
escaping refrigerant ....................... 5
1.5 Risk of death due to changes
to the product or the product
environment ................................... 5
1.6 Risk of burns caused by touching
hot surfaces ................................... 5
1.7 Risk of being scalded by hot
drinking water ................................ 6
1.8 Preventing the risk of injury from
freezing as a result of touching
refrigerant ...................................... 6
1.9 Risk of injury and material
damage due to maintenance and
repairs carried out incorrectly or
not carried out at all ....................... 6
1.10 Risk of damage from corrosion
caused by unsuitable room air....... 6
1.11 Dangers of modifying product
surroundings .................................. 6
1.12 Frost damage due to insufficient
room temperature .......................... 7
1.13 Avoid environmental damage
caused by escaping refrigerant...... 7
2 Notes on the documentation ...... 8
2.1 Observing other applicable
documents ..................................... 8
2.2 Storing documents......................... 8
2.3 Validity of the instructions .............. 8
3 Product description..................... 8
3.1 Product design............................... 8
3.2 Overview of the control
elements ........................................ 8
3.3 Displayed symbols......................... 9
3.4 Type designation and serial
number........................................... 9
3.5 Information on the data plate ......... 9
3.6 CE marking .................................. 10
4 Operation.................................... 10
4.1 Operating concept ....................... 10
4.2 Switching on the product ............. 10
4.3 Setting the language.................... 11
4.4 Setting the time............................ 11
4.5 Setting the back-up heater........... 11
4.6 Domestic hot water temperature
setting .......................................... 11
4.7 Additional domestic hot water
temperature setting when a
photovoltaic installation is
connected .................................... 12
4.8 Programming operating times...... 12
4.9 Setting the holiday mode ............. 13
4.10 Setting the boost mode................ 13
4.11 Setting limp home mode .............. 14
4.12 Activating the anti-legionella
function ........................................ 14
4.13 Frost protection function .............. 14
5 Troubleshooting ........................ 14
5.1 Detecting and rectifying faults...... 14
6 Maintenance and care ............... 14
6.1 Maintenance ................................ 14
6.2 Caring for the product .................. 14
6.3 Checking the condensate
discharge pipe and tundish.......... 15
7 Decommissioning...................... 15
7.1 Temporarily decommissioning
the product................................... 15
7.2 Permanently decommissioning
the product................................... 15
8 Recycling and disposal............. 15
8.1 Arranging disposal of
refrigerant .................................... 15
9 Guarantee and customer
service ........................................ 15
9.1 Guarantee.................................... 15
9.2 Customer service......................... 15

Contents
0020290841_00 aroSTOR Operating instructions 3
Appendix ............................................... 16
A Troubleshooting ........................ 16
B Optimising energy
consumption .............................. 17
B.1 Using a low tariff and a control
cable connection.......................... 17
B.2 Using a low tariff without a
control cable connection .............. 18
B.3 Operating with a fixed electricity
tariff.............................................. 19
C End user level –overview ......... 20

1 Safety
4Operating instructions aroSTOR 0020290841_00
1 Safety
1.1 Action-related warnings
Classification of action-re-
lated warnings
The action-related warnings
are classified in accordance
with the severity of the pos-
sible danger using the following
warning signs and signal words:
Warning symbols and signal
words
Danger!
Imminent danger to life
or risk of severe personal
injury
Danger!
Risk of death from electric
shock
Warning.
Risk of minor personal
injury
Caution.
Risk of material or envir-
onmental damage
1.2 Intended use
There is a risk of injury or death
to the user or others, or of dam-
age to the product and other
property in the event of im-
proper use or use for which it
is not intended.
The product is intended for hot
water generation.
Intended use includes the fol-
lowing:
–observance of the operating
instructions included for the
product and any other install-
ation components
–compliance with all inspection
and maintenance conditions
listed in the instructions.
This product can be used by
children aged from 8 years
and above and persons with
reduced physical, sensory or
mental capabilities or lack of
experience and knowledge if
they have been given supervi-
sion or instruction concerning
use of the product in a safe way
and understand the hazards in-
volved. Children must not play
with the product. Cleaning and
user maintenance work must
not be carried out by children
unless they are supervised.
Any other use that is not spe-
cified in these instructions, or
use beyond that specified in this
document, shall be considered
improper use. Any direct com-
mercial or industrial use is also
deemed to be improper.
Caution.
Improper use of any kind is
prohibited.

Safety 1
0020290841_00 aroSTOR Operating instructions 5
1.3 Danger caused by
improper operation
Improper operation may present
a danger to you and others, and
cause material damage.
▶Carefully read the enclosed
instructions and all other ap-
plicable documents, particu-
larly the "Safety" section and
the warnings.
▶Only carry out the activities
for which instructions are
provided in these operating
instructions.
1.4 Risk of death caused by
escaping refrigerant
The product contains R 290
refrigerant.
R 290 is an inflammable refri-
gerant.
When refrigerant escapes, there
is a risk of explosion.
▶If possible, open doors and
windows fully and ensure
adequate ventilation.
▶Do not use naked flames (e.g.
lighters, matches).
▶Do not smoke.
▶Do not use any electrical
switches, mains plugs, door-
bells, telephones or other
communication systems in
the building.
▶Leave the building immedi-
ately and ensure that others
do not enter the building.
1.5 Risk of death due to
changes to the product or
the product environment
▶Never remove, bridge or
block the safety devices.
▶Do not tamper with any of the
safety devices.
▶Do not damage or remove
any tamper-proof seals on
components.
▶Do not make any changes:
–The product itself
–The water and electricity
supply lines
–to the expansion relief valve
–to the drain pipework
–to constructional condi-
tions that may affect the
operational reliability of the
product
1.6 Risk of burns caused by
touching hot surfaces
The outgoing lines and hy-
draulic connections are hot dur-
ing operation.
▶Do not touch any hydraulic
connections.
▶Do not touch any air inlets or
outlets.

1 Safety
6Operating instructions aroSTOR 0020290841_00
1.7 Risk of being scalded by
hot drinking water
There is a risk of scalding at
the hot water draw-off points
if the hot water temperatures
are greater than 60 °C. Young
children and elderly persons are
particularly at risk, even at lower
temperatures.
▶Select the temperature so
that nobody is at risk.
1.8 Preventing the risk of
injury from freezing
as a result of touching
refrigerant
The product is delivered with an
operational filling of R 290 re-
frigerant. This is a chlorine-free
refrigerant which does not affect
the Earth's ozone layer. Escap-
ing refrigerant may cause freez-
ing if the exit point is touched.
▶If refrigerant escapes, do not
touch any components of the
product.
▶Do not inhale any steam or
gases that escape from the
refrigerant circuit as a result
of leaks.
▶Avoid skin or eye contact with
the refrigerant.
▶In the event of skin or eye
contact with the refrigerant,
seek medical advice.
1.9 Risk of injury and
material damage due to
maintenance and repairs
carried out incorrectly or
not carried out at all
▶Never attempt to carry out
maintenance work or repairs
on your product yourself.
▶Faults and damage should
be immediately rectified by a
competent person.
▶Adhere to the maintenance
intervals specified.
1.10 Risk of damage from
corrosion caused by
unsuitable room air
Sprays, solvents, chlorinated
cleaning agents, paint, adhes-
ives, ammonia compounds,
dust or similar substances
may lead to corrosion on the
product.
▶Ensure that the air supply is
always free of fluorine, chlor-
ine, sulphur, dust, etc.
▶Ensure that no chemical sub-
stances are stored at the in-
stallation site.
1.11 Dangers of modifying
product surroundings
Some types of installation and
conversion work in your home
can impair the way your product
operates.

Safety 1
0020290841_00 aroSTOR Operating instructions 7
▶Consult your installer before
undertaking the work in ques-
tion.
1.12 Frost damage due to
insufficient room
temperature
If the room temperature is set
too low in individual rooms, it
cannot be ruled out that sec-
tions of the heating installation
might be damaged by frost.
The product may release cold
air into the room. This means
the room temperature can fall
below 0 °C.
▶If you are going to be away
while the outside temperature
is low, ensure that the heating
installation remains in oper-
ation and that the rooms are
sufficiently heated.
▶You must observe the frost
protection instructions.
1.13 Avoid environmental
damage caused by
escaping refrigerant
The product contains R 290
refrigerant. The refrigerant must
not be allowed to escape into
the atmosphere.
Before the product is disposed
of, the refrigerant that is con-
tained in it must be completely
drained into a suitable vessel so
that it can then be recycled or
disposed of in accordance with
regulations.
▶Ensure that only officially cer-
tified competent persons with
appropriate protective equip-
ment carry out maintenance
work on the refrigerant circuit
or access it.
▶Arrange for the refrigerant
contained in the product to
be recycled or disposed of by
certified competent persons in
accordance with regulations.

2 Notes on the documentation
8Operating instructions aroSTOR 0020290841_00
2 Notes on the
documentation
2.1 Observing other applicable
documents
▶You must observe all operating instruc-
tions enclosed with the system compon-
ents.
2.2 Storing documents
▶Keep this manual and all other applic-
able documents safe for future use.
2.3 Validity of the instructions
Validity: aroSTOR VWL BM 200/5
OR aroSTOR VWL BM 270/5
These instructions apply only to:
Unit –article number
aroSTOR VWL BM 200/5 0010026818
aroSTOR VWL BM 270/5 0010026819
3 Product description
The product operates at air temperatures
between -7 °C and +35 °C. Outside of this
temperature range, domestic hot water
generation is only possible when using an
additional energy supply.
3.1 Product design
Validity: aroSTOR VWL BM 200/5,
aroSTOR VWL BM 270/5
1
4
2
3
5
1 Cold water con-
nection
2 Back-up water-
outlet heater
connection
3 Back-up water-
inlet heater con-
nection
4 Domestic hot
water flow con-
nection
5 Circulation circuit
connection
3.2 Overview of the control
elements
4
1
3
2
1 Menu button
2 On and off but-
ton
3 Button for setting
the time
4 Rotary knob

Product description 3
0020290841_00 aroSTOR Operating instructions 9
3.3 Displayed symbols
Sym-
bol
Meaning
Compressor in operation
Fan in operation
Defrosting function active
Electric back-up heater in operation
Domestic hot water demand
ECO mode active
Frost protection mode active
Holiday mode active
Photovoltaic mode active
Display locked
Comfort mode active
Programming mode active
Additional boiler operating
3.4 Type designation and serial
number
1
The type designation and serial number
are on the data plate (1).
3.5 Information on the data plate
The data plate is mounted on the right-
hand side of the product at the factory.
Information on the
data plate
Meaning
aroSTOR VWL Type designation
BM Cylinder type
200 / 270 Cylinder volume
/5 Unit version
Information on the
data plate
Meaning
COP Coefficient of per-
formance –heating
230 V (single-phase)
~ 50 Hz
Voltage and fre-
quency of the
product's power
supply
P max Max. power con-
sumption
I max Max amperage of the
power supply circuit
IP... IP rating/protection
class
Total weight of the
empty product
Nominal capacity of
the cylinder
Max. pressure in the
domestic hot water
circuit
Max. temperature
in the domestic hot
water circuit
P
The refrigeration cir-
cuit
Refrigerant type, fill
quantity, permissible
rated excess pres-
sure
Nominal heat output
of the refrigeration
circuit
Max. air flow in the
heat pump
P Nominal heat output
of the electric back-
up heater
0.8 m²
Circulation circuit
Barcode with serial
number,
The 7th to 16th digits
of the serial number
form the article num-
ber
Disposal of the pack-
aging

4 Operation
10 Operating instructions aroSTOR 0020290841_00
Information on the
data plate
Meaning
The cylinder con-
tains a combustible
product
See instructions
3.6 CE marking
The CE marking shows that the products
comply with the basic requirements of the
applicable directives as stated on the data
plate.
The declaration of conformity can be
viewed at the manufacturer's site.
4 Operation
4.1 Operating concept
You can use the three buttons to control
the product.
–You can press the menu button to ac-
cess the main menu.
–You can press the rotary knob to select
the menu items and confirm set values.
You can press the rotary knob to set
these values.
–You can use the clock button to set the
time.
The display switches off 180 seconds after
the last operation.
4.2 Switching on the product
1
1. Before starting up the product, ensure
that the plugs (1) have been removed
from the condensate discharge con-
nection.
2. Ensure that the stopcock upstream of
the safety assembly at the cold water
inlet is open.
3. Before switching on the power supply,
ensure that the domestic hot water
cylinder is full.
4. Ensure that the product has been con-
nected to the power supply.
5. Press the product's on/off button.
◁The display switches on.
◁A green LED lights up on the
display.
◁The background lighting on the
display flashes and prompts you to
set the language.
–Turn the rotary knob to set the
language. Press the rotary knob
to confirm the selection.
◁The unit only offers you the lan-
guage selection when it is switched
on for the first time. However, you
have the opportunity to change the
language setting. To do this, follow
the instructions in the section on set-
ting the language. (→Page 11)
◁The heat pump only starts when
the cold water temperature is be-
low the set water temperature and
when, according to the operating
programme, the switch-on time cor-
responds to the heat-up time and

Operation 4
0020290841_00 aroSTOR Operating instructions 11
heating is permitted by the electricity
tariff.
◁When the heat pump is running,
there is an air flow at the air inlet
and outlet.
Note
After the initial start-up, de-
pending on the air intake tem-
perature and cold water tem-
perature, the heat pump re-
quires 5 to 12 hours to reach a
temperature of 55 °C.
Note
The thermodynamic water
heater operates with the heat
pump as priority if the temper-
ature of the intake air is within
a range between -7 °C and
+35 °C. Outside of this temper-
ature range, the domestic hot
water is only generated via the
electric back-up heater.
4.3 Setting the language
▶If you want to change the current set-
ting, press the menu button.
▶Turn the rotary knob until the display
shows the language setting.
▶Press the rotary knob.
▶Select the required language using the
rotary knob.
▶Press the rotary knob to confirm.
▶Press the menu button to return to the
original display.
4.4 Setting the time
Note
The standard factory setting is
French local time (UTC+1). The
product does not automatically
switch between summer and winter
time. You must implement this con-
version manually.
▶Press the button to set the time.
▶Press the rotary knob to confirm.
▶Turn the rotary knob to set the day.
▶Press the rotary knob to confirm.
▶Turn the rotary knob to set the month.
▶Press the rotary knob to confirm.
▶Turn the rotary knob to set the year.
▶Press the rotary knob to confirm.
▶Turn the rotary knob to set the hour.
▶Press the rotary knob to confirm.
▶Turn the rotary knob to set the minutes.
▶Press the rotary knob to confirm.
▶Press the menu button to return to the
original display.
4.5 Setting the back-up heater
▶Press the menu button.
▶Turn the rotary knob until the BA CK
UP menu appears in the display.
▶Press the rotary knob.
▶Turn the rotary knob to display the
ELEC.BACKP or BOIL.BACKP menu.
▶Press the rotary knob to confirm.
▶Press the menu button to return to the
original display.
4.6 Domestic hot water
temperature setting
1. Press the menu button.
2. Turn the rotary knob until the TEMP.
SETT. menu appears in the display.
3. Press the rotary knob.
4. Turn the rotary knob to set the re-
quired domestic hot water temperature
(TARG ET).
5. Press the rotary knob to confirm.
6. Press the menu button to return to the
original display.

4 Operation
12 Operating instructions aroSTOR 0020290841_00
4.7 Additional domestic hot water
temperature setting when
a photovoltaic installation is
connected
Note
If this function is activated in the
installer level, the settings can be
made.
1. Press the menu button.
2. Turn the rotary knob until the T°PV
ECO menu appears in the display.
3. Press the rotary knob.
4. Turn the rotary knob to set the desired
domestic hot water temperature, which
is generated using the electrical energy
from the photovoltaic installation.
◁T°PV ECO: The heat pump heats
the water in the domestic hot water
cylinder up to a temperature above
the normal domestic hot water tem-
perature.
◁T°PV MAX: The heat pump and
immersion heater heat the water in
the domestic hot water cylinder to a
temperature above parameter T°PV
ECO.
Note
When the photovoltaic install-
ation generates electricity, the
domestic hot water temperature
setting is automatically adjus-
ted.
5. Press the rotary knob to confirm.
6. Press the menu button to return to the
original display.
4.8 Programming operating times
You can optimise the product's energy
consumption (kWh) by programming the
operating hours. Consider the following
points when creating such a programme:
–Electricity tariff tiers (low-/high-tariff peri-
ods)
–Temperature of the drawn-in air (the
product is more efficient during the
warmest parts of the day)
–Check that the product is actuated by a
low-tariff cable
4.8.1 Programming the operating
times for the first day of the
week
▶Hold down the clock button for
three seconds.
▶Select the day using the rotary knob.
▶Press the rotary knob.
▶Press the rotary knob to create a new
programme for this day.
▶Turn the rotary knob to set the end of
the first operating time.
▶Press the rotary knob.
▶Turn the rotary knob to set the comfort
level for the first operating time.
◁F-P: Defrosting –the product pre-
vents freezing (water temperature of
at least +5 °C).
◁ECO: Eco mode –the heat pump
heats the domestic hot water cylinder
to the set target temperature.
◁COnF: Comfort mode –the heat
pump and the immersion heater heat
the domestic hot water cylinder to
the set target temperature.
▶Press the rotary knob.
▶Turn the rotary knob to set the end of
the second operating time.
▶Press the rotary knob.
▶Repeat these steps to set additional
operating times (up to seven per day).
▶Turn the rotary knob to set the end of
the last operating time to its start time.

Operation 4
0020290841_00 aroSTOR Operating instructions 13
◁The end of the operating time is
automatically displayed as 24:00.
▶Press the rotary knob.
▶Press the menu button to return to the
original display.
Note
Connecting a photovoltaic in-
stallation can cause the product
to go into operation outside of
programmed time periods. The
relevant settings are made by
the competent person. If neces-
sary, discuss the setting with
your competent person.
4.8.2 Programming the operating
times for additional days of the
week
▶Hold down the clock button for
three seconds.
▶Select the day using the rotary knob.
▶Press the rotary knob.
▶Turn the rotary knob to create a pro-
gramme for this day.
▶You can copy the programme from the
previous day.
▶If you want to copy the programme for a
different day, select COPY PROG..
▶You can use MODI FY PR. to change a
copied programme.
▶You can use SEE PROG. to check an
existing programme.
▶Press the menu button to return to the
original display.
4.9 Setting the holiday mode
This mode puts the product into standby
operation in which the frost protection
function remains active. This is a program-
mable mode. A duration between 1 and 99
days can be programmed. When you con-
firm the number of days (1 day = 24-hour
time period), the mode will be activated.
This mode temporarily suspends the set
time programming.
The mode ends automatically once
the set number of days has expired.
Throughout the holiday, the display shows
HOLI.RETUR. (return from holiday) and
the number of days remaining.
▶Press the menu button.
▶Turn the rotary knob until the HOLI
DAYS menu appears in the display.
▶Press the rotary knob.
▶Turn the rotary knob to set the required
number of days' holiday.
▶Press the rotary knob.
▶Press the menu button to return to the
original display.
▶If you return from holiday earlier than
planned, repeat the steps described
above and set the number of days' holi-
day to 0.
4.10 Setting the boost mode
This mode enables temporary simultan-
eous operation of the back-up heater (im-
mersion heater) and the heat pump, in
order to heat up the domestic hot water
more quickly. The (back-up heater in op-
eration) symbol and the display flash. If
the set target temperature in the domestic
hot water cylinder is reached, the mode is
automatically deactivated.
This mode is automatically deactivated at
most 24 hours after it was activated.
This mode temporarily suspends the set
time programming.
▶Press the menu button.
▶Turn the rotary knob until the BOOST
menu appears in the display.
▶Press the rotary knob.
▶Turn the rotary knob to activate the
BOOST mode.
▶Press the rotary knob.
▶Press the menu button to return to the
original display.

5 Troubleshooting
14 Operating instructions aroSTOR 0020290841_00
4.11 Setting limp home mode
This mode enables a limp home mode for
cases where use of the heat pump is pre-
vented (air pipes not yet connected, dust-
intensive work in the product's vicinity…).
In this mode, energy savings cannot be
achieved by using the heat pump. It should
therefore be used in exceptional circum-
stances and for a limited time period only.
▶Press the menu button.
▶Turn the rotary knob until the ELEC.
MODE menu appears in the display.
▶Press the rotary knob.
▶Turn the rotary knob to activate the limp
home mode.
▶Press the rotary knob.
▶Press the menu button to return to the
original display.
4.12 Activating the anti-legionella
function
The product has an anti-legionella func-
tion. In doing so, the water in the domestic
hot water cylinder to a temperature
between 60 °C and 70 °C.
Danger!
Risk of death from legionella.
Legionella multiply at temperat-
ures below 60 °C.
▶Have a competent person
inform you about the meas-
ures that should be taken to
protect against Legionella in
your installation.
▶Do not set any water temper-
atures below 60 °C without
consulting the competent
person first.
Contact your competent person in order
to have them activate or deactivate the
anti-legionella function or to find out more
information about the anti-legionella func-
tion.
4.13 Frost protection function
Note
The product is protected by the
frost protection function. The hot
and cold water circuit is not protec-
ted by the product.
5 Troubleshooting
5.1 Detecting and rectifying faults
This section shows all of the fault mes-
sages that can be rectified without seeking
help from the competent person in order to
start up the product again.
Troubleshooting (→Page 16)
▶Ensure that the product generally works
without any problems and that no fault
messages or alarms are displayed.
▶If the product still does not function after
the fault has been rectified, contact your
competent person.
6 Maintenance and care
6.1 Maintenance
An annual inspection and maintenance
of the product carried out by a compet-
ent person is a prerequisite for ensuring
that the product is permanently ready and
safe for operation, reliable, and has a long
working life.
6.2 Caring for the product
▶Clean the casing with a damp cloth and
a little solvent-free soap.
▶Do not use sprays, scouring agents,
detergents, solvents or cleaning agents
that contain chlorine.

Decommissioning 7
0020290841_00 aroSTOR Operating instructions 15
6.3 Checking the condensate
discharge pipe and tundish
The condensate discharge pipe and tun-
dish must always be penetrable.
▶Regularly check the condensate dis-
charge pipe and tundish for faults and,
particularly, for blockages.
You must not be able to see or feel any
obstructions in the condensate discharge
pipe and tundish.
▶If you notice a fault, have it eliminated
by a competent person.
7 Decommissioning
7.1 Temporarily decommissioning
the product
▶If, during long periods of absence, the
power supply to the dwelling and to the
product is interrupted, have the product
drained by your competent person or
have it sufficiently protected against
frost.
7.2 Permanently decommissioning
the product
▶Have a competent person permanently
decommission the product.
8 Recycling and disposal
▶The competent person who installed
your product is responsible for the dis-
posal of the packaging.
If the product is labelled with this
mark:
▶In this case, do not dispose of the
product with the household waste.
▶Instead, hand in the product to a collec-
tion centre for waste electrical or elec-
tronic equipment.
If the product contains batteries that
are labelled with this mark, these batteries
may contain substances that are hazard-
ous to human health and the environment.
▶In this case, dispose of the batteries at
a collection point for batteries.
8.1 Arranging disposal of
refrigerant
The product contains R 290 refrigerant.
▶Refrigerant must only be disposed of by
qualified competent persons.
▶Observe the general safety information.
9 Guarantee and customer
service
9.1 Guarantee
Validity: Kosovo
Për informacione lidhur me garancinë e
prodhimit, mund të shkruani në adresën që
gjeni në faqen e pasme.
9.2 Customer service
Validity: Kosovo, Vaillant
Për të dhënat e kontaktit për shërbimin
tonë të klientit, mund të shkruani në
adresën që gjeni në faqen e pasme ose në
faqen e internetit www.vaillant.com.

Appendix
16 Operating instructions aroSTOR 0020290841_00
Appendix
A Troubleshooting
Fault Cause Solution
The product no longer
works.
The power supply is interrupted. Ensure that there has
not been a power cut
and that the product is
correctly connected to
the power supply. When
the power supply is re-
established, the product
automatically starts up.
If a fault is still present,
contact your competent
person.
The set target temperature of the water
is reached.
Check the domestic hot
water temperature.
The product is switched off. Check whether the
product is switched on
and the green LED is lit
up.
The product is in holiday mode. Switch off holiday mode.
The air inlet temperature is below -7 °C
or above +35 °C.
Ensure that the domestic
hot water cylinder is
heated using the back-
up energy sources (im-
mersion heater). If the
air inlet temperature is
once again between -7 °C
or and +35 °C, the heat
pump restarts.
Time programming conflicts with the
high-tariff load relief.
Check the time program-
ming.
A programmed operating time is pre-
venting operation (ECO symbol is lit
up).
Check the set operating
times.
There is a hot water
shortage.
The domestic hot water volume, which
was used within a short space of time,
is larger than the volumetric capacity of
the domestic hot water cylinder.
Wait until the domestic
hot water cylinder is sup-
plied with sufficient hot
water again.
The programmed operating time for
the heat pump is too short (at least 12
hours in a 24 hour period).
Set the operating time
so that the domestic hot
water cylinder is charged
for at least 12 hours in a
24 hour period.
The setting for the set target temperat-
ure is too low
Increase the set target
temperature.
Time programming conflicts with the
high-tariff load relief.
Check the time program-
ming.

Appendix
0020290841_00 aroSTOR Operating instructions 17
Fault Cause Solution
The condensate does not
drain off (water under-
neath the product).
The condensate discharge hose is
partly or completely blocked
Check the condensate
discharge hose.
There is a kink in the condensate
discharge hose and this is forming a
trough.
The condensate discharge hose is not
installed.
Consult your competent
person.
The electric back-up
heater is not working.
The ESC contact or a programmed
operating time is preventing operation
(ECO symbol is lit up).
Check the time program-
ming and consult your
competent person.
The safety cut-out for the electric back-
up heater has been tripped as a result
of overheating (> 87 °C).
Consult your competent
person.
Other faults Consult your competent
person.
B Optimising energy consumption
B.1 Using a low tariff and a control cable connection
Settings made by the end user
Setting/function Particularly econom-
ical
Average For increased com-
fort
Target temperature 45 °C 55 °C 65 °C
Time programming None None None
Holiday mode For absences of
more than 24 hours
For absences of
more than 3 days
For absences of
over a week
Boost mode Never Occasionally Often
Settings made by the competent person
Setting/function Particularly econom-
ical
Average Particularly expens-
ive
Anti-legionella cycle No 7 (weekly) 1 (daily –not re-
quired)
Minimum temperature No 43 °C 43 °C
MAX. TIME function No Auto 4 hours
Load relief level for high-
tariff periods (HT)
0 (Operation of the
immersion heater
and the heat pump
prevented during
high-tariff periods)
1 (Operation of the
immersion heater
prevented during
high-tariff periods)
2 (Deactivation of
the load relief cir-
cuit)
*) Exception: The air temperature lies outside the range between -7 °C and +35 °C. In this case,
operation of the back-up heater is permitted.

Appendix
18 Operating instructions aroSTOR 0020290841_00
Overview of the operating
mode
–LT: Heat pump
and immersion
heater (where
applicable) heat
the domestic hot
water cylinder
–HT: The product
runs in frost pro-
tection mode (at
least +5 °C)
–LT: Heat pump
and immersion
heater (where
applicable) heat
the domestic hot
water cylinder
–HT: Only the heat
pump heats the
domestic hot
water cylinder
*
Heat pump and
immersion heater
heat the domestic
hot water cylinder
without any time re-
striction.
*) Exception: The air temperature lies outside the range between -7 °C and +35 °C. In this case,
operation of the back-up heater is permitted.
B.2 Using a low tariff without a control cable connection
Settings made by the end user
Setting/function Average For increased com-
fort
Target temperature 45 °C 55 °C 65 °C
Time programming Low tariff (LT) →
ECO
High tariff (HT) →
Frost protection
Low tariff (LT) →
Comfort
High tariff (HT) up to
12:00 →ECO
High tariff (HT) after
12:00 →Frost pro-
tection
Low tariff (LT) →
Comfort
High tariff (HT) up to
12:00 →Comfort
High tariff (HT) after
12:00 →ECO
Holiday mode For absences of
more than 24 hours
For absences of
more than 3 days
For absences of
over a week
Boost mode Never Occasionally Often
Settings made by the competent person
Setting/function Particularly econom-
ical
Average Particularly expens-
ive
Anti-legionella cycle No 7 (weekly) 1 (daily –not re-
quired)
Minimum temperature No 43 °C 43 °C
MAX. TIME function No 6 hours 4 hours
Load relief level for high-
tariff periods (HT)
Invalid (factory set-
ting to 1)
Invalid (factory set-
ting to 1)
Invalid (factory set-
ting to 1)
*) Exception: The air temperature lies outside the range between -7 °C and +35 °C. In this case,
operation of the back-up heater is permitted.

Appendix
0020290841_00 aroSTOR Operating instructions 19
Overview of the operating
mode
–LT: Only the heat
pump heats the
domestic hot
water cylinder
*
–HT: The product
runs in frost pro-
tection mode (at
least +5 °C)
–LT: Heat pump
and immersion
heater heat the
domestic hot
water cylinder
–HT up to 12:00:
The heat pump
supplements the
heating of the
domestic hot
water cylinder
–HT after 12:00:
The product runs
in frost protection
mode (at least
+5 °C)
–LT + HT up to
12:00: Heat
pump and immer-
sion heater heat
the domestic hot
water cylinder
–HT after 12:00:
Only the heat
pump heats the
domestic hot
water cylinder
*
*) Exception: The air temperature lies outside the range between -7 °C and +35 °C. In this case,
operation of the back-up heater is permitted.
B.3 Operating with a fixed electricity tariff
Settings made by the end user
Setting/function Average For increased com-
fort
Target temperature 45 °C 55 °C 65 °C
Time programming From 23:00 to
11:00: Frost
protection
From 11:00 to
23:00: ECO
No programming From 23:00 to
11:00: ECO
From 11:00 to
23:00: No program-
ming
Holiday mode For absences of
more than 24 hours
For absences of
more than 3 days
For absences of
over a week
Boost mode Never Occasionally Often
Settings made by the competent person
Setting/function Particularly econom-
ical
Average Particularly expens-
ive
Anti-legionella cycle No 7 (weekly) 1 (daily –not re-
quired)
Minimum temperature No 43 °C 43 °C
MAX. TIME function No 6 hours 4 hours
Load relief level for high-
tariff periods (HT)
Invalid (factory set-
ting to 1)
Invalid (factory set-
ting to 1)
Invalid (factory set-
ting to 1)
*) Exception: The air temperature lies outside the range between -7 °C and +35 °C. In this case,
operation of the back-up heater is permitted.

Appendix
20 Operating instructions aroSTOR 0020290841_00
Overview of the operating
mode
–From 23:00
to 11:00: The
product runs in
frost protection
mode (at least
+5 °C)
–From 11:00 to
23:00: The heat
pump heats the
domestic hot
water cylinder
with improved
efficiency *
The heat pump
heats the domestic
hot water cylinder *.
–From 23:00 to
11:00: The heat
pump heats the
domestic hot
water cylinder
*
–From 11:00 to
23:00: The heat
pump heats the
domestic hot
water cylinder
with improved
efficiency. The
immersion heater
can be switched
on as required.
*) Exception: The air temperature lies outside the range between -7 °C and +35 °C. In this case,
operation of the back-up heater is permitted.
C End user level –overview
Validity: Vaillant
Setting level Values Unit Increment, select, explana-
tion
Factory set-
ting
Min. Max.
TEMP. SETT. →
TARG ET TARGET WA-
TER TEMP.
30 to 65 ℃ ℃ 1 55
T°PV ECO TARG ET <
T°PV ECO <
T°PV MAX
℃1, if the photovoltaic installa-
tion is connected
60
T°PV MAX T°PV ECO <
65 °C
℃1, if the photovoltaic installa-
tion is connected
65
HOLI DAYS →
HOLI.RETUR. 0 99 Days 1 0
ELEC. MODE (VWL B 290/4) →
ELEC. MODE Yes, No No
BOIL. MODE (VWL BM 290/4) →
BOIL. MODE Yes, No No
BOOST →
BOOST Yes, No No
BA CK UP →