Vaillant aroTHERM VWL Series User manual

Installation instructions
aroTHERM
VWL ../2 A 230 V
GB
Publisher/manufacturer
Vaillant GmbH
Berghauser Str. 40 D-42859 Remscheid
Tel. [phone] Fax [phone]
[email protected] www.vaillant.de

Contents
2Installation instructions aroTHERM 0020147164_09
Contents
1 Safety .................................................................... 3
1.1 Action-related warnings ......................................... 3
1.2 Intended use.......................................................... 3
1.3 General safety information .................................... 3
1.4 Regulations (directives, laws, standards).............. 5
1.5 Regulations............................................................ 5
1.6 Other regulations ................................................... 5
2 Notes on the documentation .............................. 6
2.1 Observing other applicable documents ................. 6
2.2 Storing documents................................................. 6
2.3 Validity of the instructions...................................... 6
3 System overview.................................................. 6
3.1 Safety devices ....................................................... 6
3.2 Design of the heat pump system ........................... 6
3.3 Functionality........................................................... 6
3.4 Basic system diagram (VWL 55/2 A 230 V) .......... 7
3.5 System diagram (VWL 85/2 A 230 V, VWL
115/2 A 230 V, VWL 155/2 A 230 V) ..................... 7
4 Product overview................................................. 8
4.1 Type designation and serial number ..................... 8
4.2 Information on the data plate................................. 8
4.3 CE marking............................................................ 8
4.4 Local regulations.................................................... 8
5 Assembly and installation .................................. 9
5.1 Preparing for fitting and installation ....................... 9
5.2 Carrying out the installation ................................. 13
5.3 Hydraulics installation.......................................... 14
5.4 Carrying out the electrical installation.................. 15
6 Start-up ............................................................... 16
6.1 Run the start-up................................................... 16
6.2 Heat pump operating concept ............................. 17
6.3 Running through the installation assistant........... 17
6.4 Calling up Live Monitor (checking status
codes).................................................................. 17
6.5 Calling up statistics.............................................. 17
6.6 Filling the heating circuit ...................................... 17
6.7 Checking and treating the heating water/filling
and supplementary water .................................... 18
6.8 Filling the heating installation .............................. 19
6.9 Activating the heat pump..................................... 19
6.10 Checking the product's operation ........................ 19
6.11 Operating noises.................................................. 20
6.12 Adjusting the heating circuit................................. 20
6.13 Installing the side casing ..................................... 21
6.14 Instructing the end user....................................... 21
7 Maintenance ....................................................... 21
7.1 Observing maintenance intervals ........................ 21
7.2 Preparing for maintenance .................................. 22
7.3 Instructions before carrying out maintenance
work ..................................................................... 22
7.4 Yearly maintenance............................................. 22
7.5 Cleaning the product............................................ 22
7.6 Draining the product ............................................ 23
7.7 Checking the product's status codes................... 23
7.8 Checking the electrical installation ...................... 23
7.9 Start-up following maintenance ........................... 23
8 Troubleshooting ................................................ 23
8.1 Troubleshooting................................................... 23
8.2 Fault codes .......................................................... 23
8.3 Carrying out the actuator test .............................. 24
8.4 Carrying out check programmes ......................... 24
9 Decommissioning.............................................. 24
9.1 Temporary decommissioning .............................. 24
9.2 Permanently decommissioning............................ 24
10 Recycling and disposal..................................... 24
10.1 Arranging disposal of refrigerant ......................... 24
11 Customer service............................................... 24
Appendix ............................................................................ 25
A Connection diagrams........................................ 25
A.1 Wiring diagram (VWL 55/2 A 230 V, VWL 85/2
A 230 V, VWL 115/2 A 230 V, VWL 155/2 A
230 V) .................................................................. 25
B Heat pump schematic........................................ 26
B.1 Heat pump schematic drawing (VWL 55/2 A
230 V) .................................................................. 26
B.2 Heat pump schematic drawing (VWL 85/2 A
230 V) .................................................................. 27
B.3 Heat pump schematic drawing (VWL 115/2 A
230 V) .................................................................. 28
B.4 Heat pump schematic drawing (VWL 155/2 A
230 V) .................................................................. 29
C Heat pump setting parameters......................... 29
D Status codes ...................................................... 30
E Technical data.................................................... 32
F Overview of fault codes .................................... 34
G Commissioning Checklist................................. 37
Index ................................................................................... 40

Safety 1
0020147164_09 aroTHERM Installation instructions 3
1 Safety
1.1 Action-related warnings
Classification of action-related warnings
The action-related warnings are classified in
accordance with the severity of the possible
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 environmental
damage
1.2 Intended use
There is a risk of injury or death to the user or
others, or of damage to the product and other
property in the event of improper use or use
for which it is not intended.
The product is the outdoor unit of an air-to-
water heat pump with monoblock design.
The product uses the outdoor air as a heat
source and can be used to heat a residential
building and for domestic hot water genera-
tion.
The product is only intended for outdoor in-
stallation.
The product is intended exclusively for do-
mestic use.
Intended use includes the following:
–observance of accompanying operating,
installation and maintenance instructions
for the product and any other system com-
ponents
–installing and setting up the product in ac-
cordance with the product and system ap-
proval
–compliance with all inspection and main-
tenance conditions listed in the instruc-
tions.
Intended use also covers installation in ac-
cordance with the IP code.
Any other use that is not specified in these
instructions, or use beyond that specified in
this document, shall be considered improper
use. Any direct commercial or industrial use
is also deemed to be improper.
Caution.
Improper use of any kind is prohibited.
1.3 General safety information
1.3.1 Risk caused by inadequate
qualifications
The following work must only be carried out
by competent persons who are sufficiently
qualified to do so:
–Set-up
–Dismantling
–Installation
–Start-up
–Inspection and maintenance
–Repair
–Decommissioning
▶Proceed in accordance with current tech-
nology.
1.3.2 Risk of injury due to the heavy weight
of the product
The product weighs over 50 kg.
▶Make sure that the product is carried by at
least two people.
▶Use suitable transport and lifting equip-
ment, in accordance with your risk assess-
ment.
▶Use suitable personal protective equip-
ment: Gloves, safety footwear, protective
goggles, protective helmet.
1.3.3 Risk of death due to lack of safety
devices
The basic diagrams included in this docu-
ment do not show all safety devices required
for correct installation.
▶Install the necessary safety devices in the
installation.
▶Observe the applicable national and inter-
national laws, standards and directives.

1 Safety
4Installation instructions aroTHERM 0020147164_09
1.3.4 Risk of death from electric shock
There is a risk of death from electric shock if
you touch live components.
Before commencing work on the product:
▶Disconnect the product from the power
supply by switching off all power supplies
at all poles (electrical partition with a con-
tact gap of at least 3 mm, e.g. fuse or cir-
cuit breaker).
▶Secure against being switched back on
again.
▶Wait for at least 3 minutes until the capa-
citors have discharged.
▶Check that there is no voltage.
1.3.5 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 50 °C. Young children and
elderly persons are particularly at risk, even
at lower temperatures.
▶Select the temperature so that nobody is at
risk.
1.3.6 Risk of injury or material damage due
to incorrect handling of the product
Using the fins on the front side of the product
as conductors may lead to injuries (due to
falling) or to material damage.
▶Do not use the fins as conductors.
1.3.7 Risk of material damage due to
additional elements in the heating
water
Unsuitable frost and corrosion protection
agents may damage seals and other com-
ponents of the heating circuit and may there-
fore also lead to leaks in the water outlet.
▶Only add approved frost and corrosion
protection agents to the heating water.
1.3.8 Risk of material damage caused by
using an unsuitable tool
▶Use the correct tool.
1.3.9 Avoid environmental damage caused
by escaping refrigerant
The heat pump contains the refrigerant
R410A. The refrigerant must not be allowed
to escape into the atmosphere. R410A is a
fluorinated greenhouse gas covered by the
Kyoto Protocol, with a GWP of 2088 (GWP
= Global Warming Potential). If this gas es-
capes into the atmosphere, its impact is 2088
times greater than the natural greenhouse
gas CO2.
Before the heat pump is disposed of, the re-
frigerant that is contained in it must be com-
pletely drained into a suitable vessel so that
it can then be recycled or disposed of in ac-
cordance with regulations.
▶Ensure that only officially certified com-
petent persons with appropriate protective
equipment 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.
▶Use only R410A as the refrigerant.
▶Only use a tool suitable for R410A for the
filling, pressure measurement, vacuum
generation and discharge.
▶Solder the lines using shielding gas. Check
the lines for leak-tightness using nitrogen.
▶In the event of a repair or maintenance
work, fill the refrigerant circuit with liquid
refrigerant.
▶If the refrigerant circuit is not leak-tight,
check which components must be repaired
or replaced.
▶Lower the negative pressure in the refri-
gerant circuit to max. 10 mbar (1000 Pa).
▶When filling the refrigerant circuit, observe
the values in the "Technical data" section.

Safety 1
0020147164_09 aroTHERM Installation instructions 5
1.4 Regulations (directives, laws,
standards)
▶Observe the national regulations, stand-
ards, directives, ordinances and laws.
1.5 Regulations
1.5.1 Statutory requirements
Where no British Standards exists, materials
and equipment should be fit for their purpose
and of suitable quality and workmanship.
The installation of this appliance must be car-
ried out by a competent person in accord-
ance the rules in force in the countries of des-
tination.
Manufacturer’s instructions must not be taken
as overriding statutory requirements.
1.5.2 Standards
On installing and commissioning the appli-
ance you must adhere to the technical rules,
standards and provisions in effect at the time.
1.5.3 Reminder of existing regulatory acts
–EC regulation No. 20372000 from the 29th
of June 2000 This European regulation re-
peals regulation No. 3093/94 and presents
the elimination schedules of CFC and
HCFC. It also deals with the collection of
refrigerants, system leaks, particularly sys-
tems containing more than 3 kg of CFC
or HCFC, as well as the minimum level of
qualification required by the technicians.
–EC regulation No. 0842/2006 from the 17th
of May 2006 regarding the containment,
use, collection and disposal of the fluorin-
ated greenhouse gases, the labelling and
elimination of the products and equipment
containing these gases, the restriction of
use and banning of certain products from
the market, as well as the training and cer-
tification of personnel and companies op-
erating in the activities targeted by this reg-
ulation: refrigeration, air-conditioning, heat
pumps and fire protection systems contain-
ing greenhouse gases.
1.6 Other regulations
1.6.1 Control of Substances Hazardous to
Health
Under Section 6 of The Health and Safety at
Work Act 1974, we are required to provide in-
formation on substances hazardous to health.
The adhesives and sealants used in this ap-
pliance are cured and give no known hazard
in this state.
The refrigerant used in this appliance is
R410a the use of which is strictly controlled
by F Gas regulation (EU) No. 517/2014.

2 Notes on the documentation
6Installation instructions aroTHERM 0020147164_09
2 Notes on the documentation
2.1 Observing other applicable documents
▶Always observe all the operating and installation instruc-
tions included with the system components.
2.2 Storing documents
▶Pass these instructions and all other applicable docu-
ments on to the end user.
2.3 Validity of the instructions
These instructions apply to units with the following type des-
ignations and article numbers only:
Type designation Art. no.
aroTHERM VWL 55/2 A 230 V 0010014566
aroTHERM VWL 85/2 A 230 V 0010011971
aroTHERM VWL 115/2 A 230 V 0010011972
aroTHERM VWL 155/2 A 230 V 0010014567
The seventh to sixteenth digits of the serial number on the
data plate form the article number.
3 System overview
3.1 Safety devices
–The product can work at the following outdoor temperat-
ures:
VWL 55/2 A 230 V VWL 85/2 A 230 V
VWL 115/2 A 230 V
VWL 155/2 A 230 V
Heating mode −15 to 28 ℃ −20 to 28 ℃
Cylinder charging
mode
−15 to 46 ℃ −20 to 46 ℃
–If the product's refrigerant circuit pressure exceeds the
maximum pressure of 4.15 MPa (41.5 bar), the high-
pressure pressure switch switches the product off. Fol-
lowing a waiting period, the product attempts to start
once more. After three failed start attempts in succes-
sion, a fault message is displayed.
–If the product is switched off, the crankcase housing
heating is switched on when the compressor outlet tem-
perature reaches 7 °C. This prevents possible damage
caused by switching the product back on.
–If the compressor inlet temperature and the compressor
outlet temperature are below 1 °C, the compressor does
not start up.
–A temperature sensor on the compressor outlet limits the
product's operation if the measured temperature exceeds
the maximum permissible temperature. The maximum
permissible temperature depends on the evaporation and
condensation temperature.
–The product measures the flow rate of the connected
heating circuit when starting up the product.
–If the heating circuit temperature falls below 3 °C, the
product's frost protection function is automatically activ-
ated as the heating pump is started.
Caution.
Risk of material or environmental damage.
In the event of a power cut, for example due
to maintenance work, interruptions in the
power supply or power failure at the energy
supply company, the heating water temper-
ature may fall below the freezing point. The
product's internal frost protection functions
then switch off and there is a risk of frost for
the heating installation.
▶Ensure that the heating installation can
operate without being affected by frost.
Note
Operating the heat pump outside the application
limits results in the heat pump being switched off
by the internal control and safety devices.
3.2 Design of the heat pump system
The heat pump system consists of the following components:
–aroTHERM heat pump
–VWZ AI heat pump control interface module
–Additional hydraulic components, if required
–VRC 700 system control
The heat pump can be operated by the VWZ AI heat pump
control interface module. The extended operation of the heat
pump is carried out by the system controller.
3.3 Functionality
The product comprises the following circuits:
–The refrigerant circuit releases heat into the heating cir-
cuit by means of evaporation, compression, condensa-
tion and expansion
–The heating circuit
3.3.1 Heating mode
1
2
34
56
1 Evaporator
2 4-way valve
3 Fan
4 Compressor
5 Electronic expansion
valve
6 Plate heat exchanger

System overview 3
0020147164_09 aroTHERM Installation instructions 7
3.3.2 Thawing
1
2
34
56
1 Evaporator
2 4-port valve
3 Fan
4 Compressor
5 Electronic expansion
valve
6 Plate heat exchanger
3.3.3 Application limits
Operation of the pump outside the application limits results in
the heat pump being switched off by the internal control and
safety devices.
3.3.3.1 Operating limit in heating mode
(VWL 55/2 A 230 V)
60
50
70
40
30
20
10
0-20 -10 0 10 20 30 40 50
[-15;22]
[-15;45]
[46;22]
[46;58]
[35;60]
[28;60]
[2;60]
[-10;55]
12
[28;22] [35;22]
A
B
1 Heating mode applica-
tion limits
2 Domestic hot water
generation application
limits
A Water temperature
B Air temperature
3.3.3.2 Operating limit in heating mode
(VWL 85/2 A 230 V, VWL 115/2 A 230 V,
VWL 155/2 A 230 V)
60
50
70
40
30
20
10
0-20 -10 0 10 20 30 40 50
[-20;22]
[-20;43]
[46;22]
[46;58]
[35;63]
[28;63]
[2;63]
[-10;55]
12
[28;22] [35;22]
A
B
1 Heating mode applica-
tion limits
2 Hot water generation
application limits
A Water temperature
B Air temperature
3.4 Basic system diagram (VWL 55/2 A 230 V)
e
1 3 12161719
24
1521
14
11
4
23 20
2
22 5 13 8 9
6
7
10
A
B
18
1 Fan
2 Air inlet temperature
sensor
3 Finned-tube heat ex-
changer
4 Temperature sensor
for the finned-tube heat
exchanger
5 4-port valve
6 Return heating circuit
temperature sensor
7 High-efficiency pump
with flow rate sensor
8 Purging valve
9 Flow heating circuit
temperature sensor
10 Drain valve
11 Plate heat exchanger
12 Temperature sensor
after the plate heat
exchanger
13 Service valve for the
high-pressure range of
the refrigerant circuit
14 High-pressure pressure
switch in the refrigerant
circuit
15 High-pressure sensor in
the refrigerant circuit
16 Compressor outlet
temperature sensor
17 Rotary compressor
18 Filter
19 Liquid separator
20 Electronic expansion
valve
21 Compressor inlet tem-
perature sensor
22 Service valve for the
low-pressure area of the
refrigerant circuit
23 Filter
24 Fluid collector
A Heating return
B Heating flow
3.5 System diagram (VWL 85/2 A 230 V, VWL
115/2 A 230 V, VWL 155/2 A 230 V)
e
1 3 12161719
25
23
1521
14
11
4
24 20
2
22 5 13 8 9
6
7
10
A
B
18
1 Fan 2 Air inlet temperature
sensor

4 Product overview
8Installation instructions aroTHERM 0020147164_09
3 Ribbed pipe heat ex-
changer
4 Temperature sensor
of the ribbed pipe heat
exchanger
5 4-way valve
6 Return heating circuit
temperature sensor
7 High-efficiency pump
with flow rate sensor
8 Purging valve
9 Flow heating circuit
temperature sensor
10 Drain valve
11 Plate heat exchanger
12 Temperature sensor
after the plate heat
exchanger
13 Service valve for the
high-pressure range of
the refrigerant circuit
14 High-pressure pressure
switch in the refrigerant
circuit
15 High-pressure sensor in
the refrigerant circuit
16 Compressor outlet
temperature sensor
17 Rotary piston com-
pressor
18 Filter
19 Liquid separator
20 Electronic expansion
valve
21 Compressor inlet tem-
perature sensor
22 Service valve for the
low-pressure range of
the refrigerant circuit
23 Flow rate limiter (cool-
ing mode) on the VWL
85/2 A 230 V only
24 Filter
25 Gas buffer
A Heating return
B Heating flow
4 Product overview
4.1 Type designation and serial number
1
1
The type designation and serial number are on the data plate
(1).
4.2 Information on the data plate
Information on the data
plate Meaning
Serial no. Unique unit identification number
P max Maximum rated power
I Max. operating current
I max Maximum in-rush current
R410A Refrigerant type and fill quantity
GWP 2088 Global Warming Potential of the
refrigerant
Information on the data
plate Meaning
PSR_LP
PSR_HP
Min. and max. operating pres-
sure in the refrigerant circuit
PSHmin
PSHmax
Minimum and maximum operat-
ing pressure in the heating circuit
COP (Ax/Wxx) Output figure (coefficient of
performance) at an air inlet
temperature of xx °C and a
heating flow temperature of
xx °C
(Ax/Wxx) Heating output at an air inlet
temperature of xx °C and a
heating flow temperature of
xx °C
Volt Compressor, pump and control
mains voltage
Hz Mains frequency
IP Protection class
Compressor
Fan
Pump
Control
4.3 CE marking
The CE marking shows that the products comply with the
basic requirements of the applicable directives as stated on
the declaration of conformity.
The declaration of conformity can be viewed at the manufac-
turer's site.
4.4 Local regulations
Benchmark places responsibilities on both manufacturers
and installers. The purpose is to ensure that customers are
provided with the correct equipment for their needs, that it is
installed, commissioned and serviced in accordance with the
manufacturer’s instructions by a competent person approved
at the time by the Health and Safety Executive and that it
meets the requirements of the appropriate Building Regu-
lations. The Benchmark Checklist can be used to demon-
strate compliance with Building Regulations and should be
provided to the customer for future reference.
Installers are required to carry out installation, commission-
ing and servicing work in accordance with the Benchmark
Code of Practice which is available from the Heating and
Hotwater Industry Council who manage and promote the
Scheme.

Assembly and installation 5
0020147164_09 aroTHERM Installation instructions 9
Visit www.centralheating.co.uk for more information.
Planning consent and Building works notification should be
submitted either to Building Control or to a Competent Per-
son Provider.
5 Assembly and installation
5.1 Preparing for fitting and installation
5.1.1 Delivery, transport and positioning
5.1.1.1 Transporting the product
Warning.
Risk of injury from lifting a heavy weight.
Lifting weights that are too heavy may cause
injury to the spine, for example.
▶When transporting the product, two
people should lift it.
▶Observe the product weight stated in the
technical data.
▶When transporting heavy loads, observe
the applicable directives and regulations.
Caution.
Risk of material damage due to incorrect
transportation.
Regardless of the mode of transport, the heat
pump must never be tilted by more than 45°.
Otherwise, this may lead to malfunctions
in the refrigerant circuit during subsequent
operation. In the worst case scenario, this
may lead to a fault in the whole system.
▶During transport, do not tilt the heat pump
by any more than the maximum angle of
45°.
▶Use the transportation belt to carry the product to the
final installation site.
▶Only lift the product from the back and side where the
hydraulic connections are located.
▶When transporting the product using a hand truck, secure
the product using a belt.
▶In order to avoid scratches and damage, protect the
sides of the product that come into contact with the hand
truck.
5.1.1.2 Unpacking the product
13mm
12
3
4
B
A
D
E
C
1. Remove the accessory (2).
2. Remove the documentation supplied (1).
3. Remove the transport belt (4).
4. Carefully remove the packaging and padding without
damaging the product (3).
5. Remove the screws from the pallet at the front and rear
of the product.
5.1.1.3 Checking the scope of delivery
▶Check the contents of the packaging units
Quant-
ity
Description
1 Condensate discharge
1 Bag with seals
4 Vibration-isolating feet
1 Purge hose

5 Assembly and installation
10 Installation instructions aroTHERM 0020147164_09
5.1.2 Dimensions
5.1.2.1 Front view
A
B
Product A* B
VWL 55/2 A 230 V 834 980
VWL 85/2 A 230 V
VWL 115/2 A 230 V
973 1103
VWL 155/2 A 230 V 1375 1103
* Size increases by 45 mm when using the vibration dampers
supplied.
5.1.2.2 Side view, right
C
D
BA
Product A B C D
VWL 55/2 A 230 V 408 32 481 581
VWL 85/2 A 230 V
VWL 115/2 A 230 V
VWL 155/2 A 230 V
463 32 481 581
5.1.2.3 Bottom view
C
ABB
D
E
Product A B C D E
VWL 55/2 A 230 V 740 120 490 386 70
VWL 85/2 A 230 V
VWL 115/2 A 230 V
VWL 155/2 A 230 V
778 162 550 437 102
5.1.3 Complying with minimum clearances
5.1.3.1 Installation clearance
C
B
D
A
A
0.5 m
Clearance For heating mode
A > 250 mm
B > 1000 mm
C > 120 mm*
D > 600 mm
*Caution: If the minimum clearances are not maintained, the
efficiency of the product may be affected.
▶To guarantee sufficient air flow and to facilitate mainten-
ance work, observe the minimum clearances that are
specified above.

Assembly and installation 5
0020147164_09 aroTHERM Installation instructions 11
▶Ensure that there is sufficient room to install the hydraulic
lines.
▶If the product is to be installed in areas where heavy
snow falls, ensure that the snow does not accumulate
around the product and that the minimum clearances
specified above are observed. If you cannot ensure this,
install an additional heat generator in the heating circuit.
A raised base is available as an accessory. In order to
adapt the product to higher levels of snow, only use the
Vaillant raised base.
5.1.3.2 Selecting the installation site
▶Observe all valid regulations.
▶Install the product outside the building.
▶Do not install the product:
–Near a heat source,
–Near flammable materials,
–Near ventilation openings for adjacent buildings,
–Under deciduous trees.
▶Note the following points when installing the product:
–Prevailing winds,
–The visual impression on the environment
▶Avoid places where strong winds blow on the product's
air outlet.
▶Point the fan away from nearby windows. Install noise
protection if necessary.
▶Install the product on one of the following supports:
–Concrete slab,
–Steel T-beam,
–Concrete block,
–Elevating socket (Vaillant accessory),
▶Do not expose the product to dusty or corrosive air (e.g.
near unsecured streets).
▶Do not install the product near ventilation shafts.
▶Prepare the routing for the electrical wires.
dB(A)
dB(A)
▶Note any noise emissions from the fan and compressor.

5 Assembly and installation
12 Installation instructions aroTHERM 0020147164_09
5.1.3.3 Installing the heat pump
▶Note the safety warnings in these instructions and in the
operating instructions before installing the product.
▶Install the product on steel beams, concrete blocks or
using a wall bracket (accessory).
▶Ensure that no water collects under the product.
▶In order to avoid ice formation, ensure that the ground in
front of the product can absorb water well.
5.1.3.4 Preparing the condensate discharge
Danger!
Risk of injury due to frozen condensate.
Frozen condensate on paths may cause falls.
▶Ensure that condensate does not dis-
charge onto paths and that ice cannot
build up there.
The condensate is discharged centrally underneath the
product.
The condensate is heated inside the product and routed into
the condensate discharge.
300
B
>100
380
>ø100
1500
A
410350 350
C
750
380
410350 350
D
750
4
2
3
4
1
▶Dig a hole in the ground. The recommended dimensions
can be found in the figure and the table.
aroTHERM VWL 55 C 70
aroTHERM VWL 85 - 155 D 102
▶Insert a downpipe (1) (diversion of the condensate).
▶Add a layer of coarse rubble (3) (water-permeable, frost-
free foundation). Calculate the depth (A) in accordance
with local conditions.
–Minimum depth: 900 mm
▶Calculate the height (B) in accordance with local condi-
tions.
▶Create two concrete strip foundations (4). The recom-
mended dimensions can be found in the figure.
▶Place a gravel bed (2) between and beside the strip
foundations (for condensate drainage).

Assembly and installation 5
0020147164_09 aroTHERM Installation instructions 13
5.2 Carrying out the installation
5.2.1 Removing the side casing
BA
A
C
1. Remove both screws.
2. Pull the side casing downwards and then forwards.
Note
Note that the required tool is not included in
the scope of delivery.
5.2.2 Aligning the product
M10
8mm
1. Align the product horizontally so that condensate can
flow.
Note
The product must be installed with the vibra-
tion-isolating feet supplied. The product is lif-
ted by the vibration-isolating feet, which sim-
plifies the condensate-discharge process and
reduces vibrations.
2. Screw in the vibration-damping feet using the concrete
foundation.
–Screw length: ≤8 mm
Note
The concrete foundation must not be joined
to the house foundations.

5 Assembly and installation
14 Installation instructions aroTHERM 0020147164_09
5.3 Hydraulics installation
In heating installations that are equipped primarily with ther-
mostatic or electrically controlled valves, a constant and suf-
ficient flow through the heat pump must be ensured. Irre-
spective of which heating installation is selected, the min-
imum volume of circulating heating water (40% of the nom-
inal flow, see the technical data table) must be guaranteed.
5.3.1 Carrying out the hydraulics installation
Caution.
Risk of material damage caused by
residues in the pipelines.
Welding remnants, sealing residues, dirt or
other residues in the pipelines may damage
the product.
▶Flush the heating installation thoroughly
before installing the product.
Caution.
Risk of material damage due to corrosion.
If plastic pipes that are not diffusion-tight are
used in the heating circuit, this may lead to
corrosion and deposits in the heating circuit
and in the product.
▶Do not treat the water with corrosion pro-
tection agents if plastic pipes that are not
diffusion-tight are used.
Danger!
Risk of material damage caused by sol-
dering work.
Carrying out soldering work on lines that
have already been installed may damage the
seals.
▶Solder the lines before installing the
product.
1. Insulate the lines (including those running below
ground) with UV-resistant and high-temperature-res-
istant insulation between the product and the heating
installation.
2. In order to avoid transferring vibrations to the surround-
ing buildings, use flexible connection pipes on the
product that have a length of at least 0.75 m.
3. When the product is not installed at the highest point
in the heating circuit, install additional purging valves
in places where air can collect (elevated points in the
system).
4. Install all of the safety-relevant hydraulic components.
Note
If you use glycol, you must collect it at the
expansion relief valve to prevent environ-
mental pollution.
Note
Improper purging of the heating circuit may
cause pump faults due to a low flow rate
(F.532).
0.75 m min.
7
3
1
96
2
4
5
8
1 Connection hose in
the heating flow to the
building (on-site)
2 O-ring seal
3 Covering cap
4 Heating flow connection
(diameter 1 1/4") to the
building
5 Heating return connec-
tion (diameter 1 1/4") to
the heat pump
6 Connection hose in the
heating return to the
heat pump (on-site)
7 Insulation (on-site)
8 Stop valve
9 Dirt filter
5. Remove the covering caps (3) from the product's hy-
draulic connections.
6. Install a dirt filter (9) in the heating circuit return
between two isolation valves (8) so that the filter can be
cleaned regularly.
7. Install a flexible connection pipe (1) and (6) (to be
provided on-site) with an O-ring and an isolation valve
to each of the connections for the heat pump heating
flow and return.
8. Check the connections for tightness.
5.3.2 Connecting the swimming pool (optional)
Danger!
Risk of material damage due to a direct
connection to a swimming pool.
If the product is directly connected to a swim-
ming pool, damage may be caused by corro-
sion.
▶Do not connect the heat pump heating
circuit directly to a swimming pool.
▶If you want to connect a swimming pool to the heating
circuit, note the components (expansion vessels, etc.)
that are required for the installation.

Assembly and installation 5
0020147164_09 aroTHERM Installation instructions 15
5.3.3 Connecting the condensate discharge pipe
Note
Observe all valid national regulations and rules.
Use the supplied elbow only in frost-free regions.
Observe the maximum condensate discharge
hose length of 365 mm.
90°
A
B1
2
1. Connect the condensate discharge tundish (2) to the
product's floor plate, and secure this in place by turning
it by a 1/4 rotation.
2. Slide the heating wire (1) through the condensate dis-
charge tundish.
3. Ensure that the condensate discharge tundish is posi-
tioned in the centre above the downpipe. See dimen-
sion drawing (→Page 12).
5.4 Carrying out the electrical installation
30 mm max.
12
1 Connecting wires 2 Insulation
Danger!
Risk of death from electric shock as a res-
ult of an improper electrical connection!
An improper electrical connection may neg-
atively affect the operational safety of the
product and result in material damage or per-
sonal injury.
▶The electrical installation must be carried
out by a suitably qualified competent per-
son who is responsible for complying with
the existing standards and directives.
1. Only strip a maximum of 3 cm from the outer sheathing
of the flexible lines.
2. Secure the conductors in the connection terminals.
5.4.1 Establishing the power supply
The external mains connection cable must be earthed and
connected with the correct polarity and in accordance with
the valid regulations.
▶Check that the mains connection cable is connected cor-
rectly.
The cables that connect the product to the fuse box must:
–Be suitable for fixed installation,
–Be weatherproof,
–Be equipped with a wire cross-section that is necessary
for the product performance.
▶Connect the product using a fixed connection and a parti-
tion with a contact opening of at least 3 mm (e.g. fuses or
power switches).
In order to meet the overvoltage category II requirements,
further fuse protection may be required.
To meet the overvoltage category III conditions, the parti-
tions must ensure a complete separation of the power sup-
ply.
5.4.2 Standard tariff
5.4.2.1 230 V connection
X4
X9
EBUS
X7
FLOOR H
X2
21
2
1
1 Mains connection ter-
minal in the product
2 Partition
Caution.
Risk of material damage due to high con-
nected voltage.
At mains voltages greater than 253 V, elec-
tronic components may be damaged.
▶Ensure that the nominal voltage of the
mains is 230 V (+10%/-14%) ~50 Hz.
▶Connect the power supply cable to the power supply
connection for the product.
▶If it is stipulated for the installation site, for the product,
install a universal-current-sensitive type B residual-cur-
rent circuit breaker.
▶Guide the power supply cable through the product's
grommet (PEG screwed connection).

6 Start-up
16 Installation instructions aroTHERM 0020147164_09
5.4.3 Laying the 24 V cabling
PE N L
230 V~
+ -
Bus VF1 SP1
PE N L
230 V~
PE N L
MA1
PE N L
MA2
PE N Auf Zu
UV1
PE N 1 2
ZH
2 1 2 1
X4
X9
EBUS
X7
FLOOR H
3
1
2
1 eBUS connection in the
heat pump (observe the
polarity)
2 Limit thermostat con-
nection (underfloor pro-
tective circuit)
3 eBUS connection in
the VWZ AI heat pump
control module or in the
hydraulic station
1. Feed the cable through the cable duct.
VWL 55/2 A 230 V
VWL 85/2 A 230 V
VWL 115/2 A 230 V
VWL 155/2 A 230 V
Recommended eBUS cable dimen-
sion
2 x 0.75 mm²
Recommended cable dimension for
eBUS + limit thermostat
4 x 0.75 mm²
2. Connect the eBUS cable to the system controller.
3. If you install a limit thermostat (e.g. 50 °C) in the heat-
ing circuit flow, remove the bridge from terminal (2) and
connect the limit thermostat to this terminal.
5.4.4 Installing the grommet
Caution.
Risk of malfunction due to incorrect rout-
ing of the supply lines.
If you route the supply lines for the power
supply and the eBUS line through the same
cable duct, the signal will be disrupted.
▶Route the supply lines for the power sup-
ply and the eBUS line through various
cable ducts in the product.
123456789101112131415
16
1
2
3
4
ØA
ØA
1
2
1 eBUS line and limit
thermostat line grommet
2 Power supply grommet
1. Measure the diameter of the cable.
2. Drill a hole the same size as the cable diameter in the
grommet.
3. Route the cable through the grommet.
4. Tighten the grommet with two open-ended spanners.
6 Start-up
6.1 Run the start-up
1. Before starting up the product, read through the operat-
ing instructions.
2. Check that the electrical partition is installed.
3. Check that the hydraulic and electric connections are
correctly designed.
4. Check that a dirt filter is installed in the heat pump re-
turn.
5. Check whether an expansion relief valve, an expansion
vessel and a pressure gauge are installed.
6. Check the leak-tightness of the connections.
7. Open all the heating circuit valves.

Start-up 6
0020147164_09 aroTHERM Installation instructions 17
6.2 Heat pump operating concept
Caution.
Risk of material damage caused by incor-
rect handling.
Incorrect settings at installer level may cause
damage to the heating installation.
▶Only access the installer level if you are
an approved competent person.
The operating concept and operation of the heat pump is
described in the operating instructions for the heat pump.
Note
Path details at the start of a section specify how
to access this function in the user interface for the
heat pump control interface module, e.g. Menu →
Information →Contact details.
Menu →Installer level
–You can call up the installer level using code 17.
6.3 Running through the installation assistant
The installation assistant is launched when the heat pump is
switched on for the first time.
You must confirm the launching of the installation assistant.
Once confirmed, all heat demands from the heat pump are
blocked. This status remains until the installation assistant is
completed or cancelled.
▶Set the basic system diagram number in the VWZ AI heat
pump control interface module.
6.3.1 Setting the language
Menu →Default setting →Language
–You can use this function to set the desired language.
6.3.2 Telephone number for the competent person
You can store your telephone number in the appliance
menu.
The operator can display it in the information menu. The tele-
phone number can be up to 16 digits long and must not con-
tain any spaces. If the telephone number is shorter, end the
entry after the last digit by pressing the right-hand selection
button .
All of the digits to the right will be deleted.
6.4 Calling up Live Monitor (checking status
codes)
Menu →Live Monitor
–You can use this function to call up the status code of the
heat pump, which provides you with information about
the current operating condition of the heat pump.
6.5 Calling up statistics
Menu →Installer level →Test menu →Statistics
–You can use this function to call up the statistics for the
heat pump.
6.6 Filling the heating circuit
Note
We recommend using ethylene glycol with corro-
sion-inhibiting additives.
If no frost protection has been poured in, the
product will not be protected in the event of a
power cut when there is frost.
A
B
10mm
2
1
3
4
1 Heating circuit purging
valve
2 Open-end spanner (on-
site)
3 Hose
4 Collecting container (on-
site)
1. Purge the heating circuit during the filling process, see
Purging the heating circuit (→Page 20).
2. Connect one end of the hose (3) to the heating circuit's
purging valve (1).
3. During the purging process, insert the other end of the
hose (3) into the collecting vessel (4).
4. Open the heating circuit's purging valve (1) with an
open-ended spanner (2).
–Working materials: SW10 open-end spanner

6 Start-up
18 Installation instructions aroTHERM 0020147164_09
5. To purge the heating circuit, open the heating circuit's
purging valve (1) by a 1/4 rotation (B) using an open-
ended spanner.
6. Increase the operating pressure in the heat pump heat-
ing circuit.
–Operating pressure: 0.15 to 0.2 MPa (1.50 to
2.0 bar)
Note
The pressure level may fall in the first month
following start-up. It may also vary depending
on the outdoor temperature.
1 3
5
6
42
1 Drain hose
2 Heating flow
3 Stop valve
4 Water/glycol supply
5 Heating return
6 Collecting container
7. Close the stopcock in the heating flow.
8. Fill the heating circuit via the heating return.
◁Air collects at the purging valve.
Condition: If you are using glycol
▶The glycol must not escape into the outflow or the envir-
onment.
▶Prepare a mixture with suitable glycol (max. 50% ethyl-
ene glycol) in order to protect the heat pump against frost
according to the regional minimum temperatures.
Note
If no frost protection has been poured in, the
product will not be protected in the event of a
power cut when there is frost.
▶Use a refractometer tester to ensure the correct dosage.
6.7 Checking and treating the heating
water/filling and supplementary water
Caution.
Risk of material damage due to poor-qual-
ity heating water
▶Ensure that the heating water is of suffi-
cient quality.
▶Before filling or topping up the installation, check the
quality of the heating water.
Checking the quality of the heating water
▶Remove a little water from the heating circuit.
▶Check the appearance of the heating water.
▶If you ascertain that it contains sedimentary materials,
you must desludge the installation.
▶Use a magnetic rod to check whether it contains mag-
netite (iron oxide).
▶If you ascertain that it contains magnetite, clean the in-
stallation and apply suitable corrosion-inhibition meas-
ures, or fit a magnetic filter.
▶Check the pH value of the removed water at 25 °C.
▶If the value is below 8.2 or above 10.0, clean the installa-
tion and treat the heating water.
▶Ensure that oxygen cannot get into the heating water.
Checking the filling and supplementary water
▶Before filling the installation, measure the hardness of the
filling and supplementary water.
Treating the filling and supplementary water
▶Observe all applicable national regulations and technical
rules when treating the filling and supplementary water.
Provided the national regulations and technical rules do not
stipulate more stringent requirements, the following applies:
You must treat the heating water in the following cases
–If the entire filling and supplementary water quantity dur-
ing the operating life of the system exceeds three times
the nominal volume of the heating installation, or
–If the guideline values listed in the following table are not
met, or
–If the pH value of the heating water is less than 8.2 or
more than 10.0.
Total
heating
output
Water hardness at specific system volume1)
≤20 l/kW > 20 l/kW
≤50 l/kW > 50 l/kW
kW ppm
CaCO₃
mol/
m³
ppm
CaCO₃
mol/
m³
ppm
CaCO₃
mol/
m³
< 50 < 300 < 3 200 2 2 0.02
> 50
to ≤200
200 2 150 1.5 2 0.02
> 200
to ≤600
150 1.5 2 0.02 2 0.02
> 600 2 0.02 2 0.02 2 0.02
1) Nominal capacity in litres/heating output; in the case of multi-
boiler systems, the smallest single heating output is to be used.

Start-up 6
0020147164_09 aroTHERM Installation instructions 19
Caution.
Risk of material damage if the heating
water is treated with unsuitable additives.
Unsuitable additives may cause changes in
the components, noises in heating mode and
possibly subsequent damage.
▶Do not use any unsuitable antifreeze and
corrosion inhibitors, biocides or sealants.
No incompatibility with our products has been detected to
date with proper use of the following additives.
▶When using additives, follow the manufacturer's instruc-
tions without exception.
We accept no liability for the compatibility of any additive or
its effectiveness in the rest of the heating system.
Additives for cleaning measures (subsequent
flushing required)
–Adey MC3+
–Adey MC5
–Fernox F3
–Sentinel X 300
–Sentinel X 400
Additives intended to remain permanently in the
installation
–Adey MC1+
–Fernox F1
–Fernox F2
–Sentinel X 100
–Sentinel X 200
Additives for frost protection intended to remain
permanently in the installation
–Adey MC ZERO
–Fernox Antifreeze Alphi 11
–Sentinel X 500
▶If you have used the above-mentioned additives, inform
the end user about the measures that are required.
▶Inform the end user about the measures required for frost
protection.
6.8 Filling the heating installation
Caution.
Risk of material damage due to heating
water that is extremely calciferous or cor-
rosive or contaminated by chemicals.
Unsuitable tap water damages the seals
and diaphragms, blocks components in the
product and heating installation through
which the water flows and causes noise.
▶Only fill the heating installation with suit-
able heating water.
Note
If a heat exchanger module is used, the heating
circuit must be topped up with heating water.
Condition: System separation with a heat exchanger module
▶Connect the filling tap with the heating water supply using
a cold water tap where possible.
▶Open all radiator valves (thermostatic valves) of the heat-
ing installation.
▶Open the cold water tap.
▶Slowly open the filling tap.
▶Fill it with water until the required filling pressure is
reached.
▶Close the cold water tap.
▶Purge all radiators.
▶Start the purging programme using the P10 and P11 test
programmes (→Page 24).
▶Then check the filling pressure on the display.
▶Top up with more water if necessary.
▶Close the filling tap.
6.9 Activating the heat pump
1. Ensure the maximum flow temperature setting matches
the heating installation.
2. To fully activate the heating installation, observe the
installation instructions for the system controller.
3. Switch on the line protection switch in the fuse box
which is connected to the heat pump.
6.10 Checking the product's operation
1. Ensure that the external control equipment (thermo-
stats, external sensors, etc.) are sending a heating
demand to the heat pump. When configuring several
areas, test heating circuit by heating circuit and ensure
that the appropriate heating circuit gets warmer.
2. Ensure that all heating circuit thermostatic radiator
valves are open.
3. If necessary, balance the heat generator.

6 Start-up
20 Installation instructions aroTHERM 0020147164_09
6.11 Operating noises
"Hhmmm..." (*)
"Ttsheeh...!"
"Eeee..."
“Clink!"
"Chug, chug,
chug,..."
"Whirr..." (*)
1
2
3
4
5
6
* Permanent operating
noises
The noises listed do not constitute a fault with the heat
pump.
In various operating modes, the noises come from the heat
pump (Start, Thawing, Stop).
6.12 Adjusting the heating circuit
6.12.1 Purge the heating circuit
1. Connect one end of the hose to the purging valve.
2. In order to collect the residual glycol when purging the
heating circuit, insert the other end of the hose into the
mixing container.
3. Close the isolation valves on the back of the product.
4. Increase the pressure in the heating circuit.
5. Open the purging valve with an open-ended spanner.
–Working materials: SW10 open-end spanner
6. Open the lower isolation valve on the back of the
product.
7. If liquid escapes from the pipe, close the purging valve.
8. Repeat the work steps for all hydraulic circuits by chan-
ging the direction of the 3-port diverter valve.
9. Check the pressure in the heating circuit. If necessary,
increase it.
–Operating pressure: 0.15 to 0.2 MPa (1.50 to
2.0 bar)
10. Open the service valves on the back of the product.
11. Remove the hose and the mixing container.
Note
The system control has a purging function.
The purging function can be started via the
heat pump control interface module. Within
15 minutes, the pumps are switched on for a
period of 30 seconds and switched off again
(30 seconds).
6.12.1.1 Available pressure in the heat pump heating
circuit
A
B
0
10
20
30
40
50
60
70
80
5000 1000 1500 2000
C
100
200
300
400
500
600
700
800
90 900
2500
3
2
1
4
1 VWL 55/2 A 230 V
(water temperature 20
°C)
2 VWL 85/2 A 230 V
(water temperature 20
°C)
3 VWL 115/2 A 230 V
(water temperature 20
°C)
4 VWL 155/2 A 230 V
(water temperature 20
°C)
A Remaining feed head
(kPa)
B Flow rate (l/h)
C Remaining feed head
[mbar]
6.12.2 Adjusting the heating circuit flow rate
Caution.
Risk of material damage due to frost
If the minimum flow rate is too low, the heat
exchanger may become damaged by frost.
▶Operate the product with a sufficient flow
rate (see table).
The product is designed for operation between the minimum
flow rate and maximum flow rate, as specified in the table. If
the product is operated with the minimum flow rate, this res-
ults in a loss of energy and efficiency. The heating comfort is
still guaranteed but the energy savings are reduced.
VWL 55/2 VWL 85/2 VWL 115/2 VWL 155/2
Minimum
flow rate
380 l/h 380 l/h 540 l/h 1,200 l/h
Maximum
flow rate
860 l/h 1,400 l/h 1,900 l/h 2,590 l/h