Manual Vaillant aroTHERM VWL 155-2 (page 21 of 52) (English)

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Installation instructions

aroTHERM

VWL 55/2 A 230 V; VWL 85/2 A 230 V; VWL

115/2 A 230 V; VWL 155/2 A 230 V

Installation instructions

Publisher/manufacturer

Vaillant GmbH

Berghauser Str. 40 D-42859 Remscheid

Telefon 021 91 18‑0 Telefax 021 91 18‑28 10

info@vaillant.de www.vaillant.de

Contents

2 Installation instructions aroTHERM 0020147164_04

Contents

1 Safety .................................................................... 3

1.1 Action-related warnings ......................................... 3

1.2 Required personnel qualifications ......................... 3

1.3 General safety information .................................... 3

1.4 Regulations (directives, laws, standards) .............. 4

1.5 CE label ................................................................. 4

1.6 Approvals............................................................... 5

1.7 Local regulations.................................................... 5

1.8 Regulations............................................................ 5

1.9 Other regulations ................................................... 5

1.10 Intended use.......................................................... 6

2 Notes on the documentation .............................. 7

2.1 Observing other applicable documents ................. 7

2.2 Storing documents................................................. 7

2.3 Applicability of the instructions .............................. 7

3 System overview.................................................. 7

3.1 Safety devices ....................................................... 7

3.2 Design of the heat pump system........................... 7

3.3 Functionality........................................................... 7

3.4 System diagram (VWL 55/2 A 230 V).................... 8

3.5 System diagram (VWL 85/2 A 230 V, VWL

115/2 A 230 V, VWL 155/2 A 230 V)..................... 8

4 Overview of the equipment................................. 9

4.1 Type designation and serial number ..................... 9

4.2 Information on the identification plate.................... 9

5 Assembly and installation .................................. 9

5.1 Preparing for fitting and installation ....................... 9

5.2 Carrying out the installation ................................. 14

5.3 Hydraulics installation.......................................... 14

5.4 Carrying out the electrical installation.................. 17

5.5 Connection diagrams........................................... 19

6 Start-up ............................................................... 21

6.1 Run the start-up................................................... 21

6.2 Heat pump operating concept ............................. 21

6.3 Running through the installation assistant........... 21

6.4 Calling up Live Monitor (checking status

codes).................................................................. 21

6.5 Calling up statistics.............................................. 21

6.6 Filling the heating circuit ...................................... 21

6.7 Preparing the heating water ................................ 22

6.8 Filling the heating installation .............................. 23

6.9 Activating the heat pump ..................................... 23

6.10 Checking the product's operation ........................ 23

6.11 Operating noises.................................................. 23

6.12 Adjusting the heating circuit................................. 23

6.13 Installing the side cladding .................................. 25

6.14 Instructing the operator........................................ 25

7 Maintenance....................................................... 25

7.1 Observing maintenance intervals ........................ 25

7.2 Preparing for maintenance .................................. 25

7.3 Instructions before carrying out maintenance

work ..................................................................... 25

7.4 Yearly maintenance............................................. 25

7.5 Cleaning the product............................................ 26

7.6 Draining the product ............................................ 26

7.7 Checking the product's status codes................... 27

7.8 Checking the electrical installation ...................... 27

7.9 Start-up following maintenance ........................... 27

8 Troubleshooting ................................................ 27

8.1 Troubleshooting................................................... 27

8.2 Fault codes .......................................................... 27

8.3 Carrying out the actuator test .............................. 27

9 Decommissioning.............................................. 28

9.1 Temporary decommissioning .............................. 28

9.2 Permanently decommissioning............................ 28

10 Vaillant customer service ................................. 28

10.1 Customer service................................................. 28

11 Disposal.............................................................. 28

11.1 Recycling and disposal........................................ 28

11.2 Arranging disposal of coolant .............................. 28

Appendix ............................................................................ 29

A Overview of accessories................................... 29

B System diagrams............................................... 30

B.1 System diagram 8 E ............................................ 30

B.2 System diagram 8 F............................................. 32

B.3 System diagram 10 B .......................................... 34

B.4 System diagram 12 A .......................................... 36

C Wiring diagrams................................................. 37

C.1 Wiring diagram 8 E .............................................. 37

C.2 Wiring diagram 8 F .............................................. 38

C.3 Wiring diagram 10 B ............................................ 39

C.4 Wiring diagram 12 A ............................................ 40

D Heat pump schematic........................................ 41

D.1 Heat pump schematic drawing (VWL 55/2 A

230 V) .................................................................. 41

D.2 Heat pump schematic drawing (VWL 85/2 A

230 V) .................................................................. 42

D.3 Heat pump schematic drawing (VWL 115/2 A

230 V) .................................................................. 43

D.4 Heat pump schematic drawing (VWL 155/2 A

230 V) .................................................................. 44

E Heat pump setting parameters......................... 44

F Technical data.................................................... 45

G Overview of fault codes .................................... 48

Index ................................................................................... 51

Safety 1

0020147164_04 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 Required personnel qualifications

Improper work carried out on the product

may cause material damage to the complete

installation and, as a consequence, may even

cause personal injury.

▶ You should therefore only work on the

product if you are an authorised competent

person.

1.3 General safety information

1.3.1 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 applicable documents, par-

ticularly the "Safety" section and the warn-

ings.

1.3.2 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 (electrical partition with a contact

opening of at least 3 mm, e.g. fuse or

power switch).

▶ Secure against being switched back on

again.

▶ Wait for at least 3 minutes until the con-

densers have discharged.

▶ Check that there is no voltage.

▶ Cover or insulate adjacent live parts.

1.3.3 Risk of death due to lack of safety

devices

A lack of safety devices (e.g. expansion re-

lief valve, expansion vessel) may lead to po-

tentially fatal scalding and other injuries, e.g.

due to explosions. The schematic drawings

included in this document do not show all

safety devices required for correct installa-

tion.

▶ Install the necessary safety devices in the

system.

▶ Inform the operator about the function and

position of the safety devices.

▶ Observe the applicable national and inter-

national laws, standards and guidelines.

1.3.4 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.

1.3.5 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.

1.3.6 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 Safety

4 Installation instructions aroTHERM 0020147164_04

1.3.7 Risk of material damage caused by

using an unsuitable tool

▶ Use the correct tool to tighten or loosen

screw connections.

1.3.8 Avoid environmental damage

caused by escaping coolant

The heat pump contains R410A coolant.

The coolant must not be allowed to escape

into the atmosphere. R410A is a fluorinated

greenhouse gas covered by the Kyoto Pro-

tocol, with a GWP of 1725 (GWP = Global

Warming Potential). If it escapes into the at-

mosphere, its impact is 1725 times stronger

than the natural greenhouse gas CO

Before the heat pump 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.

▶ Ensure that only officially certified com-

petent persons with appropriate protective

equipment carry out maintenance work on

the coolant circuit or access it.

▶ Arrange for the coolant contained in the

product to be recycled or disposed of by

accredited specialists in accordance with

regulations.

▶ Only use coolant R410A.

▶ Only use a suitable R410A tool 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 coolant circuit with liquid

coolant.

▶ If the coolant circuit is not leak-tight, check

which component must be repaired or re-

placed.

▶ Lower the negative pressure in the coolant

circuit to max. 10 mbar (1000 Pa).

▶ When filling the coolant circuit, observe the

values in the "Technical data" section.

1.4 Regulations (directives, laws,

standards)

As part of the installation, commissioning and

operation of the heat pump and the DHW

storage you must take into account the cur-

rent versions of the following regulations or

standards, along with any local directives or

guidelines that may apply.

– Electricity at work act.

– Health and safety at work act.

– Relevant Utility supplier’s regulations.

– Water regulations and by-laws.

– Environment agency and local council re-

quirements regarding bore holes, water

courses, or noise levels.

– Gas safety installation and use regulations

concerning any associated gas fired heat

source used within the heating system.

– Building regulations part “L&P” and direct-

ives concerning energy saving.

– Building regulations such as G3 covering

Hygiene and L8 Legieonella.

– COSHH regulations.

– Other relevant bodies such as HETAS and

OFTEC.

– BS7671 requirements for electrical installa-

tions.

All other national and regional relevant regu-

lations for the installation of heat pumps and

heating systems must be followed.

1.5 CE label

The CE label shows that the products comply

with the basic requirements of the applicable

directives as stated on the identification plate.

The declaration of conformity can be viewed

at the manufacturer's site.

Safety 1

0020147164_04 aroTHERM Installation instructions 5

1.6 Approvals

This product has been fully tested in accord-

ance with:

– BS EN 14511:2011

1.7 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 instruc-

tions by a competent person approved at the

time by the Health and Safety Executive and

that it meets the requirements of the appro-

priate Building Regulations. The Benchmark

Checklist can be used to demonstrate compli-

ance with Building Regulations and should be

provided to the customer for future reference.

Installers are required to carry out installation,

commissioning and servicing work in accord-

ance with the Benchmark Code of Practice

which is available from the Heating and Hot-

water Industry Council who manage and pro-

mote the Scheme.

Visit www.centralheating.co.uk for more in-

formation.

Planning consent and Building works notific-

ation should be submitted either to Building

Control or to a Competent Person Provider.

1.8 Regulations

1.8.1 Statutory requirements

Where no British Standards exists, materials

and equipment should be fi t 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.

1.8.2 Standards

On installing and commissioning the appli-

ance you must adhere to the technical rules,

standards and provisions in eff ect at the

time.

1.8.3 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

qualifi cation required by the technicians.

– EC regulation No. 0842/2006 from the 17th

of May 2006 regarding the containment,

use, collection and disposal of the fl uorin-

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-

tifi cation of personnel and companies op-

erating in the activities targeted by this reg-

ulation: refrigeration, air-conditioning, heat

pumps and fi re protection systems con-

taining greenhouse gases.

1.9 Other regulations

1.9.1 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 EN842/2006.

1 Safety

6 Installation instructions aroTHERM 0020147164_04

1.10 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 heat pump is an air/water monoblock

system and uses the energy from the outside

air to supply heat to the building.

The heat pumps are intended exclusively for

domestic use as heat generators for closed

heating and hot water central heating sys-

tems and for hot water generation.

Intended use includes the following:

– observance of accompanying operating,

installation and servicing instructions for

the product and any other system compon-

ents

– installing and fitting the product in accord-

ance with the product and system approval

– compliance with all inspection and main-

tenance conditions listed in the instruc-

tions.

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.

Notes on the documentation 2

0020147164_04 aroTHERM Installation instructions 7

2 Notes on the documentation

2.1 Observing other applicable documents

▶ You must observe all the operating and installation in-

structions included with the system components.

2.2 Storing documents

▶ Pass these instructions and all other applicable docu-

ments on to the system operator.

2.3 Applicability 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

identification plate form the article number.

3 System overview

3.1 Safety devices

– The product can work at the following outside 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 … 28 ℃ −20 … 28 ℃

Cylinder charging

mode

−15 … 46 ℃ −20 … 46 ℃

– If the product's coolant circuit pressure exceeds the max-

imum pressure of 4.15 MPa (41.5 bar), the high-pres-

sure pressure switch switches the product off. Follow-

ing a waiting period, the product attempts to start once

more. After three failed start attempts in succession, 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 in order to prevent possible dam-

age caused by switching it 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 ac-

tivated as the heating pump is started. In addition, frost

protection agent should be added to the heating water as

the heating water temperature may fall below the freez-

ing point in the event of a power cut, which poses a risk

of frost to the heating installation.

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 module

– Additional hydraulic components, if required

– VRC 470 system controller

The heat pump can be operated by the VWZ AI heat pump

control 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 coolant circuit releases heat into the heating circuit

by means of evaporation, compression, condensation

and expansion

– The heating circuit

3.3.1 Heating mode

1 Evaporator

2 4-way valve

3 Fan

4 Compressor

5 Electronic expansion valve

6 Plate heat exchanger

3.3.2 Thawing

1 Evaporator 2 4-way valve

3 System overview

8 Installation instructions aroTHERM 0020147164_04

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 Application limits in heating mode (VWL

55/2 A 230 V)

-20 -10 0 10 20 30 40 50

[-15;22]

[-15;45]

[46;22]

[46;58]

[35;60]

[28;60]

[2;60]

[-10;55]

[28;22]

[35;22]

1 Heating mode application

limits

2 Hot water generation

application limits

A Water temperature

B Air temperature

3.3.3.2 Application limits in heating mode (VWL

85/2 A 230 V, VWL 115/2 A 230 V, VWL 155/2

A 230 V)

-20 -10 0 10 20 30 40 50

[-20;22]

[-20;43]

[46;22]

[46;58]

[35;63]

[28;63]

[2;63]

[-10;55]

[28;22]

[35;22]

1 Heating mode application

limits

2 Hot water generation

application limits

A Water temperature

B Air temperature

3.4 System diagram (VWL 55/2 A 230 V)

1 3 12161719

1521

5 13 8 9

1 Fan

2 Air inlet temperature

sensor

3 Ribbed pipe heat ex-

changer

4 Temperature sensor of

the ribbed pipe heat ex-

changer

5 4-way valve

6 Return heating circuit

temperature sensor

7 High-efficiency pump with

flow sensor

8 Purging valve

9 Flow heating circuit tem-

perature 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

coolant circuit

14 High-pressure pressure

switch in the coolant cir-

cuit

15 High-pressure sensor in

the coolant circuit

16 Compressor outlet temper-

ature sensor

17 Rotary piston compressor

18 Filter

19 Liquid separator

20 Electronic expansion valve

21 Compressor inlet temper-

ature sensor

22 Service valve for the low-

pressure range of the

coolant 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)

1 3 12161719

1521

5 13 8 9

1 Fan 2 Air inlet temperature

sensor

Overview of the equipment 4

0020147164_04 aroTHERM Installation instructions 9

3 Ribbed pipe heat ex-

changer

4 Temperature sensor of

the ribbed pipe heat ex-

changer

5 4-way valve

6 Return heating circuit

temperature sensor

7 High-efficiency pump with

flow sensor

8 Purging valve

9 Flow heating circuit tem-

perature 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

coolant circuit

14 High-pressure pressure

switch in the coolant cir-

cuit

15 High-pressure sensor in

the coolant circuit

16 Compressor outlet temper-

ature sensor

17 Rotary piston compressor

18 Filter

19 Liquid separator

20 Electronic expansion valve

21 Compressor inlet temper-

ature sensor

22 Service valve for the low-

pressure range of the

coolant circuit

23 Flow rate limiter (cooling

mode) on the VWL 85/2 A

230 V only

24 Filter

25 Gas buffer

A Heating return

B Heating flow

4 Overview of the equipment

4.1 Type designation and serial number

The type designation and serial number are on the identifica-

tion plate (1).

4.2 Information on the identification plate

Information on the identi-

fication plate

Meaning

Serial no. Unique unit identification number

P max Maximum rated power

I Max. operating current

I max Maximum start-up current

R410A Coolant type and fill quantity

_LP

_HP

Min. and max. operating pres-

sure in the coolant circuit

Information on the identi-

fication plate

Meaning

min

max

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-

ler mains voltage

Hz Power frequency

IP Protection class

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.

5 Assembly and installation

10 Installation instructions aroTHERM 0020147164_04

▶ 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 coolant circuit during subsequent opera-

tion. 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°.

1. Use the transportation belt to carry the product to the

final installation site.

2. Only lift the product from the back and side where the

hydraulic connections are located.

3. When transporting the product using a hand truck, se-

cure the product using a belt.

4. 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

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

5.1.2 Complying with clearances and installation

clearances

5.1.2.1 Unit dimensions and connection

dimensions

120

74 0

980

408

840*

386

VWL 55/2 A 230 V

386

* Size increases by 45 mm

when using the vibration

dampers supplied.

Assembly and installation 5

0020147164_04 aroTHERM Installation instructions 11

162

778

1103

463

975*

437

VWL 85/2 A 230V

VWL 115/2 A 230V

437

* Size increases by 45 mm

when using the vibration

dampers supplied.

162

778

1103

463

1380*

437

VWL 155/2 A 230V

437

* Size increases by 45 mm

when using the vibration

dampers supplied.

5 Assembly and installation

12 Installation instructions aroTHERM 0020147164_04

5.1.2.2 Installation clearance

0.5 m

Clearance For heating mode

A > 250 mm

B > 1000 mm

C > 120 mm*

D > 600 mm

E > 300 mm

*Caution: If the minimum clearances are not maintained, the

output 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.

▶ 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.

An elevating socket is available as an accessory. In order

to adapt the product to higher levels of snow, only use

the Vaillant elevating socket.

5.1.2.3 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),

– Wall bracket (permitted Vaillant accessory for VWL

55/2 A 230 V, VWL 85/2 A 230 V and VWL 115/2 A

230 V or VWL 115/2 A 400 V).

▶ 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 lines.

Assembly and installation 5

0020147164_04 aroTHERM Installation instructions 13

dB(A)

▶ Note any noise emissions from the fan and compressor.

5.1.2.4 Installing the heat pump

1. Note the safety information in this manual and in the

operating instructions before installing the product.

2. Install the product on steel beams, concrete blocks or

using a wall holder (accessory).

3. Ensure that no water collects under the product.

4. In order to avoid ice formation, ensure that the ground

in front of the product can absorb water well.

5.1.2.5 Preparing the condensate discharge

>100mm

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.

▶ Prepare the condensate discharge using a drain line or in

a gravel bed.

5 Assembly and installation

14 Installation instructions aroTHERM 0020147164_04

5.2 Carrying out the installation

5.2.1 Removing the side casing

1. Remove both screws (A).

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

1. Only use bolts of a specific length.

– Maximum length: ≤ 8 mm

2. Align the product horizontally so that condensate can

flow.

Note

The product must be installed with the vi-

bration-isolating feet supplied. The product

is lifted by the vibration-isolating feet, which

simplifies the condensate-discharge process

and reduces vibrations.

3. Screw in the vibration-damping feet using the concrete

foundation.

Note

The concrete foundation must not be joined

to the house foundations.

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 damage caused by residue in the

heating flow and return.

Residue from the pipelines, such as welding

beads, scale, hemp, putty, rust and coarse

dirt, may be deposited in the product and

cause malfunctions.

▶ Flush the heating installation thoroughly

before connecting the product in order to

remove any possible residue.

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.

Assembly and installation 5

0020147164_04 aroTHERM Installation instructions 15

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

suitable places.

4. Install the following accessories in the heating return.

Installation without decoupling hydraulic module

– Drain cock

– Air separator (if required)

– Dirt filter

– An expansion vessel suitable for the complete hydraulic

installation

– Expansion relief valve 0.3 MPa (3 bar)

– Pressure gauge (recommended)

Note

If you use glycol, you must collect it at the

expansion relief valve to prevent environ-

mental pollution.

0.75 m min.

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 connection

(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)

5. Remove the covering caps (3) from the product's hy-

draulic connections.

6. Install a dirt filter in the heating circuit return between

two stop valves so that the filter can be cleaned regu-

larly.

7. Install a flexible connection pipe (1) and (6) (to be

provided on-site) with an O-ring and a stop valve to

each of the connections for the heat pump heating flow

and return.

8. Check the connections for tightness.

5.3.2 Installing system diagram 8, variant E

1. Install the system in accordance with system diagram 8,

variant E (→ Page 30).

Note

In this system, the circulation pump of the

heat pump functions as a heating pump. It

is also in operation when only the boiler is in

operation.

2. On start-up, set system diagram 8 on the controller.

3. In order to guarantee operation with two heat generat-

ors, install the flow temperature sensor.

4. Connect the eBUS-compatible boiler using a bus

coupler on the eBUS line.

5.3.3 Installing system diagram 8, variant F

1. Install the system in accordance with system diagram 8,

variant F (→ Page 30).

2. On start-up, set system diagram 8 on the controller.

3. In order to guarantee a minimum circulation water

volume, install a differential-pressure bypass valve.

4. In order to guarantee the product's underfloor protective

circuit, install a limit thermostat.

5. In order to guarantee the hot water generation using the

heat pump, install a cylinder sensor and a 3-way valve.

5.3.4 Installing system diagram 10, variant B

1. Install the system in accordance with system diagram

10, variant B (→ Page 30).

2. On start-up, set system diagram 10 on the controller.

3. In order to guarantee a minimum circulation water

volume, install a differential-pressure bypass valve.

4. In order to guarantee that the unit can be operated with

an auxiliary heating module, install the flow temperature

sensor.

5. In order to guarantee the hot water generation using the

heat pump, install a cylinder temperature sensor and a

3-way valve.

6. In order to guarantee the product's underfloor protective

circuit, install a limit thermostat.

7. Install an auxiliary electric heater on-site.

8. Set the hot water temperature for the pre-heating stage

on the system controller and the desired hot water tem-

perature on the on-site auxiliary heater.

5.3.5 Installing system diagram 12, variant A

1. Install the system in accordance with system diagram

12, variant A (→ Page 30).

2. On start-up, set system diagram 12 on the controller.

3. Connect the area valves.

4. In order to guarantee a minimum circulation water

volume, install a differential-pressure bypass valve.

5. In order to guarantee the product's underfloor protective

circuit, install a limit thermostat.

6. In order to guarantee that the unit can be operated with

an auxiliary heating module, install the flow temperature

sensor.

5 Assembly and installation

16 Installation instructions aroTHERM 0020147164_04

7. In order to guarantee the hot water generation using the

heat pump, install a cylinder temperature sensor and a

3-way valve.

5.3.6 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.

5.3.7 Connecting the condensate drain pipework

Note

Observe all valid national regulations and rules.

365

Ø25

1 Condensate drain pipe

2 Adaptor

3 Cable tie

4 Elbow

5 Seal

1. Observe the various installation dimensions for the

products.

Product Dimension Value

– VWL 55/2 A 70.0 mm

B 490.0 mm

– VWL 85/2

– VWL 115/2

– VWL 155/2

A 102.5 mm

B 550.0 mm

2. Pull the heating wire in the condensate pan until the

elbow (4).

3. Connect the elbow (4) and adaptor (2) to the seal (5)

and secure them both using a cable tie (3).

4. Connect a condensate drain pipe to the elbow.

5. Install the heating wire in the condensate drain pipe (1)

in order to prevent the condensate from freezing in the

line.

6. Connect the adaptor (2) with the product's floor plate

and secure it with a 1/4 rotation.

Assembly and installation 5

0020147164_04 aroTHERM Installation instructions 17

7. Make sure that the condensate drain pipe ends in a

gravel bed.

Note

The condensate drain pipe must not be

longer than 365 mm, otherwise it may freeze

over.

8. Route the condensate drain pipework with a downward

gradient.

5.4 Carrying out the electrical installation

30 mm max.

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

EBUS

FLOOR H

1 Mains connection terminal

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 rated voltage of the mains

is 230 V.

▶ Connect the mains connection cable to the product's

power supply connection.

VWL

55/2

230 V

VWL

85/2

230 V

VWL

115/2

230 V

VWL

155/2

230 V

Power supply 1/N/PE

230 V

50 Hz

1/N/PE

230 V

50 Hz

1/N/PE

230 V

50 Hz

1/N/PE

230 V

50 Hz

Fuse 16 A -

type C

or D

16 A -

type C

or D

20 A -

type C

or D

20 A -

type C

or D

Recommended

cable dimension

3G x

2.5 mm²

3G x

2.5 mm²

3G x

2.5 mm²

3G x

2.5 mm²

▶ To ensure that people are safe, install a separate 30 mA

residual-current-operated circuit-breaker for the heat

pump.

▶ Guide the mains connection cable through the product's

cable duct (PEG screwed connection).

5 Assembly and installation

18 Installation instructions aroTHERM 0020147164_04

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

UV1

PE N 1 2

2 1 2 1

EBUS

FLOOR H

1 eBUS connection in the

heat pump (observe the

polarity)

2 Limit thermostat connec-

tion (underfloor protective

circuit)

3 eBUS connection in the

VWZ AI heat pump control

module or in the VWZ

MEH 61

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 cable duct

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

ØA

1 eBUS line and limit ther-

mostat line cable duct

2 Power supply cable duct

1. Measure the diameter of the cable.

2. Drill a hole the same size as the cable diameter in the

cable duct.

3. Route the cable through the cable duct.

4. Tighten the cable duct with two open-end spanners.

Assembly and installation 5

0020147164_04 aroTHERM Installation instructions 19

5.5 Connection diagrams

5.5.1 Connection 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)

X60DA

X14

X700

X16

X11

X15

X13

X26

X23

X21

X22

X30 X25

X24

X25

X10CA

RL1

1 Temperature sensor of the ribbed pipe heat exchanger

2 Temperature sensor after the plate heat exchanger

3 Coolant circuit pressure switch

4 Compressor inlet temperature sensor

5 Compressor outlet temperature sensor

6 Coolant circuit temperature sensor

7 Heat pump heating flow temperature sensor

8 Heat pump heating return temperature sensor

5 Assembly and installation

20 Installation instructions aroTHERM 0020147164_04

9 Air inlet temperature sensor

10 Electronic expansion valve

11 Main PCB

12 Coding resistance

13 Diagnosis software connection

14 Fan 1

15 Fan 2 (for VWL 155/2 only)

16 Fan PCB

17 Crankcase heating

18 Drain pan electrical heating rod

19 LED status display

20 Heating circuit high-efficiency pump with flow sensor

21 4-way valve

22 PCB installation

23 Rotary piston compressor

24 Inverter box

25 Temperature sensor for ribbed pipe heat exchanger

Start-up 6

0020147164_04 aroTHERM Installation instructions 21

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.

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.

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 heating demands from the heat pump

are blocked. This status remains until the installation assist-

ant is completed or cancelled.

Set the system diagram number in the VWZ AI heat pump

control module in accordance with the schematic drawings in

the appendix (→ Page 30).

6.3.1 Setting the language

Menu → Basic 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.

Conditions: SW10 open-end spanner

10mm

1 Heating circuit purging

valve

2 Open-end spanner (on-

site)

3 Hose

4 Collecting container (on-

site)

▶ To purge the heating circuit during the filling procedure,

use a filling pump.

▶ Connect one end of the hose (3) to the drain valve.

▶ When purging, insert the other end of the hose (3) into

the mixing container (4).

▶ Open the filling valve using an open-end spanner (2).

▶ To purge the heating circuit, open the purging valve by a

1/4 rotation (B) using an open-end spanner.

6 Start-up

22 Installation instructions aroTHERM 0020147164_04

▶ Increase the operating pressure in the heat pump heat-

ing circuit.

– Operating pressure: 0.15 … 0.2 MPa (1.50

… 2.0 bar)

Note

The pressure level may fall in the first month

following start-up. It may also vary depending

on the outside temperature.

Conditions: 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 frost protection tester to ensure the correct

dosage.

6.7 Preparing the heating water

Caution.

Risk of material damage if the heating

water is treated with unsuitable frost and

corrosion protection agents.

Frost and corrosion protection agents may

cause changes in the seals, noises during

heating and may lead to further damage.

▶ Do not use any unsuitable frost and corro-

sion protection agents.

Mixing additives with the heating water may result in material

damage. However, no incompatibility with Vaillant units has

been detected with proper use of the following products over

a long period.

▶ When using additives, follow the manufacturer's instruc-

tions without exception.

Note

Vaillant accepts no liability for the compatibility

of any additive or its effectiveness in the rest

of the heating installation.

Additives for cleaning measures (subsequent

flushing required)

– Fernox F3

– Sentinel X 300

– Sentinel X 400

Additives intended to remain permanently in the

system

– Fernox F1

– Fernox F2

– Sentinel X 100

– Sentinel X 200

Additives for frost protection intended to remain

permanently in the system

– Fernox HP 15 or HP15c

– Sentinel X 500

▶ Inform the operator about the measures required if you

have used these additives.

▶ Inform the operator about the measures required for frost

protection.

Permissible water hardness

Note

Contact the local water supply company for further

information on water quality.

▶ Observe all applicable national regulations and technical

standards when treating the filling and supplementary

water.

Provided the national regulations and technical standards

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 volume dur-

ing the operating life of the system exceeds three times

the nominal volume of the heating installation,

– If the limit values shown in the following tables are not

observed.

Total heating

output

Total hardness at smallest boiler heating

surface

20 l/kW

> 20 l/kW

< 50 l/kW

> 50 l/kW

mol/m³ (mg/l

CaCO₃)

mol/m³ (mg/l

CaCO₃)

mol/m³ (mg/l

CaCO₃)

< 50

No require-

ment

2 (200) 0,02 (2,0)

< 3

(300

)

> 50 to 200 2 (200) 1,5 (150) 0,02 (2,0)

1) Of the specific system volume (nominal capacity in

litres/heating output; on systems with more than one boiler, the

lowest individual heating output must be set). These values only

apply up to three times the system volume for filling and supple-

mentary water. If three times the system volume is exceeded,

the water must be treated in accordance with the specifications

from the VDI (softening, desalting, hardness stabilisation or

blowing down). This is exactly the same as if the limit values in

the table were exceeded

2) On systems with circulation water heaters and for systems

with electric heating elements

Permissible salt content

Heating water char-

acteristics

Unit Low-salt Saline

Electrical conductivity

at 25 °C

μS/cm < 100 100 … 1,500

Appearance —

Free of sedimentary materi-

als

pH value at 25 °C —

8,2 … 10,0

Start-up 6

0020147164_04 aroTHERM Installation instructions 23

Heating water char-

acteristics

Unit Low-salt Saline

Oxygen mg/l < 0.1 < 0.02

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.

Conditions: System separation with a heat exchanger module

▶ Connect the filling cock with the heating water supply

using a cold water valve where possible.

▶ Open all radiator valves (thermostatic radiator valves) of

the heating installation.

▶ Open the cold water valve.

▶ Slowly open the filling cock.

▶ Fill it with water until the required filling pressure is

reached.

▶ Close the cold water valve.

▶ Purge all radiators.

▶ Then check the filling pressure on the display.

▶ Top up with more water if necessary.

▶ Close the filling cock.

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.

6.11 Operating noises

"Hhmmm..." (*)

"Ttsheeh...!"

"Eeee..."

“Clink!"

"Chug, chug,

chug,..."

"Whirr..." (*)

* 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 Purging the heating circuit

Conditions: SW14 open-end spanner

▶ Connect one end of the hose to the purging valve.

▶ In order to collect the residual glycol when purging the

heating circuit, insert the other end of the hose into the

mixing container.

▶ Close the stop valves on the back of the product.

▶ Increase the pressure in the heating circuit.

▶ Open the purging valve with an open-end spanner.

▶ Open the lower stop valve on the back of the product.

▶ If liquid escapes from the pipe, close the purging valve.

▶ Check the pressure in the heating circuit. If necessary,

increase it.

6 Start-up

24 Installation instructions aroTHERM 0020147164_04

– Operating pressure: 0.15 … 0.2 MPa (1.50

… 2.0 bar)

▶ Open the service valves on the back of the product.

▶ Remove the hose and the mixing container.

6.12.1.1 Available pressure in the heat pump

heating circuit

5000 1000 1500 2000

100

200

300

400

500

600

700

800

90 900

2500

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

You can read the flow rate directly from the controller. De-

pending on the type of liquid in the heating circuit, the flow

rate displayed on the controller may be exaggerated.

Example: If you use a 30% mixture of propylene glycol and

the liquid temperature is 5 °C, you must subtract 400 l/h from

the value shown on the display.

▶ Use the following table to compare the various exaggera-

tion flow rate values depending on liquid type.

– Applies for: VWL 55/2 A 230 V,

VWL 85/2 A 230 V,

VWL 115/2 A 230 V

Flow rate increase (l/h) Temper-

ature

5 °C

Temper-

ature

15 °C

Temper-

ature

25 °C

Liquid

type

Water 0 0 0

60% alcohol 0 0 0

30% propylene

glycol

400 240 120

50% propylene

glycol

650 500 400

30% ethylene

glycol

120 0 0

50% ethylene

glycol

400 140 50

– Applies for: VWL 155/2 A 230 V

Flow rate increase (l/h) Temper-

ature

5 °C

Temper-

ature

15 °C

Temper-

ature

25 °C

Liquid

type

Water 0 0 0

60% alcohol 0 0 0

30% propylene

glycol

600 440 280

50% propylene

glycol

1050 740 580

30% ethylene

glycol

520 350 300

50% ethylene

glycol

880 680 540

Note

Insufficient purging may lead to deviations in the

flow rate.

▶ If you cannot reach the minimum flow rate, install an ad-

ditional pump.

▶ If you cannot reach the recommended flow rate, adjust

the heating circuit pressure on the controller and, if ne-

cessary, use a bypass valve (item 50).

6.12.3 Adapting the unit to the heating installation

The installation assistant is launched when the product is

switched on for the first time.

If you have already filled the heating installation and termin-

ated the installation assistant, but want to set the most im-

portant system parameters again, you can also call up the

Configuration menu point.

Menu → Installer level Configuration

Maintenance 7

0020147164_04 aroTHERM Installation instructions 25

6.12.3.1 Heat pump setting parameters

To individually set the heat pump, you can adjust certain

parameters in the Configuration menu.

Menu → Installer level Configuration

Additional setting data is listed in the appendix.

Heat pump setting parameters (→ Page 44)

6.13 Installing the side cladding

▶ Install the side cladding.

6.14 Instructing the operator

1. Explain the how the system operates to the operator.

2. Draw particular attention to the safety information,

which the operator must follow.

3. Make the operator aware of the need for regular main-

tenance (maintenance contract).

4. Explain to the operator how to check the system's water

volume/filling pressure.

7 Maintenance

7.1 Observing maintenance intervals

1. Only carry out maintenance work if you are a competent

person.

2. Carry out annual maintenance.

7.2 Preparing for maintenance

7.2.1 Procuring spare parts

The original components of the unit were also certified as

part of the CE declaration of conformity. Information about

available Vaillant genuine spare parts is available by con-

tacting the contact address provided on the reverse of this

document.

▶ If you require spare parts for maintenance or repair work,

use only Vaillant genuine spare parts.

7.3 Instructions before carrying out

maintenance work

Observe the basic safety rules before carrying out mainten-

ance work or installing spare parts.

Danger!

Risk of injury due to unauthorised access

to the coolant circuit.

Escaping coolant may cause freezing if the

exit point is touched.

▶ Only carry out work on the coolant circuit if

you have been trained to do so and if you

have the required protective clothing.

▶ Avoid skin and eye contact with the

coolant.

▶ Switch the system off.

▶ Disconnect the system from the power supply.

▶ Where necessary, disconnect the heating circuit from the

product by using the stop valves.

▶ If you have to replace parts on the heating circuit, you

must first drain the product.

▶ When working on the product, protect all electric com-

ponents from spray water.

7.4 Yearly maintenance

▶ Check that the safety devices are functioning properly.

▶ Check the heating circuit's fill pressure.

▶ Ensure that there are no traces of rust or oil on the

coolant circuit components.

▶ Ensure that the product components are neither worn nor

defective.

▶ Check that all wires sit securely in the connectors.

▶ Check the product's earthing.

▶ Check the heating pump's flow temperature and the set-

tings.

▶ Remove any dust from the electronics box and the in-

verter box.

▶ Clean the ribbed pipe heat exchanger and ensure that air

circulates between the fins and around the product.

▶ Check that the fan rotates freely.

▶ Check that condensate can escape freely from the heat

pump by removing the adaptor underneath the heat

pump.

▶ Clean the product as described in the operating instruc-

tions.

▶ Check that the vibration dampers are correctly seated on

the coolant lines.

7 Maintenance

26 Installation instructions aroTHERM 0020147164_04

7.5 Cleaning the product

7.5.1 Cleaning the front

Warning.

Risk of injury due to sharp-edged casing.

The product's casing sections have sharp

edges.

▶ Wear gloves when installing or dismant-

ling the product's casing sections.

1. Remove the side casing. (→ Page 14)

2. Remove both screws (1).

3. Lift off the cover.

4. Remove both screws (2) on the right front casing.

5. Remove the right front casing.

6. Lift the louvred grill (3) upwards.

7. Remover the fan grill casing (4).

8. Remove the nut (5) from the fan.

9. Remove the fan.

10. Clean the product and the ribbed pipe heat exchanger.

7.5.2 Cleaning the back

Warning.

Risk of injury due to sharp-edged casing.

The product's casing sections have sharp

edges.

▶ Wear gloves when installing or dismant-

ling the product's casing sections.

1. Remove the side casing. (→ Page 14)

2. Remove both screws (1).

3. Lift off the cover.

4. Remove the four screws (2) and remove the mesh (3).

5. Clean the product.

7.6 Draining the product

Conditions: SW10 open-end spanner

▶ Disconnect the product from the power supply.

10mm

1 Heating circuit drain cock 2 Drain hose

1. Close the stop valves on the back of the heat pump.

2. To drain the heating circuit, connect a hose to the drain

cock or place a vessel underneath the drain cock.

3. Open the drain cock with an open-end spanner.

Troubleshooting 8

0020147164_04 aroTHERM Installation instructions 27

Note

If necessary, you can drain the heating

installation using this drain cock by opening

the stop valves on the back of the heat

pump.

7.7 Checking the product's status codes

Menu → Live Monitor

You can check the product's status codes at any time to see

which operating condition the heat pump is in. You can read

these codes on the display of the heat pump control module

or hydraulic station VWZ MEH 61.

7.8 Checking the electrical installation

▶ Check the electrical installation and take all relevant dir-

ectives into account.

Checking the cable

If the product's mains power cable is damaged, then, in order

to avoid danger, only the manufacturer, the Customer Ser-

vice team or a similarly qualified person should replace the

mains power cable.

▶ To replace the mains power cable, see Carrying out the

electrical installation (→ Page 17).

7.9 Start-up following maintenance

1. After the maintenance work has been completed, start

up the product – see Start-up (→ Page 21).

2. If you have carried out work on load-bearing parts,

check that they are securely fitted.

3. When you have completed work on the product, carry

out an operational and safety test.

8 Troubleshooting

8.1 Troubleshooting

You should carry out the following tests before introducing

additional steps:

▶ Make absolutely sure that the power supply was not cut

and that the product is correctly connected.

▶ Ensure that the service valves are open.

▶ Check that all external controllers are correctly connec-

ted.

8.2 Fault codes

The fault codes are described in a table in the Appendix.

Fault codes (→ Page 48)

In the event of a fault, a fault code number is shown in the

controller's display.

▶ Carry out all necessary repairs.

▶ Switch the product on/off using the partition.

8.3 Carrying out the actuator test

Menu → Installer level → Test menu → Sensor/actuator

test

You can check that the components of the heating installa-

tion are functioning correctly using the sensor/actuator test.

Display Test programme

T.0.01 Heating pump power

T.0.05 Fan power

T.0.07 4-way valve (circuits for thawing are not counted)

T.0.08 Position of the electronic expansion valve

T.0.09 Heating coil compressor

T.0.13 Flow temperature

T.0.14 Return temperature

T.0.15 Heating circuit pressure

T.0.16 Heating circuit flow rate

T.0.17 Lockout contact S20

T.0.66 Air inlet temperature

T.0.26 Compressor outlet temperature

T.0.27 Compressor inlet temperature

T.0.29 Heat exchanger temperature

T.0.30 High pressure

T.0.31 Condensation temperature

T.0.33 Evaporation temperature

T.0.34 Superheating target value

T.0.35 Superheating actual value

T.0.36 Subcooling actual value

T.1.37 Outside temperature

T.1.38 DCF status

T.1.59 Multi-function output 1

T.1.60 Multi-function output 2

T.1.61 Diverter valve 1

T.1.62 Flow sensor

T.1.63 Cylinder sensor

T.1.64 Multi-function input

T.1.65 Energy supply company input

T.1.66 Inlet temperature

T.1.67 High-pressure switch

T.1.68 Compressor rotational speed

T.1.69 Condensate pan heating

T.1.15 Water pressure

9 Decommissioning

28 Installation instructions aroTHERM 0020147164_04

9 Decommissioning

9.1 Temporary decommissioning

1. Switch the product off.

2. Disconnect the product from the power supply.

9.2 Permanently decommissioning

1. Switch the product off.

2. Disconnect the product from the power supply.

3. Drain the product. (→ Page 26)

4. Dispose of or recycle the product and its components.

10 Vaillant customer service

10.1 Customer service

To ensure regular servicing, it is strongly recommended

that arrangements are made for a Maintenance Agreement.

Please contact Vaillant Service Solutions (0870 6060 777)

for further details.

To ensure efficient and reliable operation of your boiler it is

recommended that regular servicing is carried out by your

service provider:

Vaillant Applied System Sales

Vaillant Group UK Ltd.

Nottingham Road

Belper

Derbyshire DE56 1JT

United Kingdom

VaillantTraining: 845 601 88 85

E-mail: commercial@vaillant.co.uk

Commercial service assistance: 870 850 30 72 (Mon-Fri

8:30am – 5:30pm)

Technical advice: 844 693 31 33 (Mon-Fri 8:30am – 5:30pm,

Sat 9:00am - 4:00pm)

E-mail: technical@vaillant.co.uk

11 Disposal

11.1 Recycling and disposal

▶ The competent person who installed your product is re-

sponsible for the disposal of the packaging.

If the product or any batteries that it contains are

marked with this symbol, they contain substances hazardous

to human health and to the environment.

▶ In this case, do not dispose of the product and any bat-

teries that it contains with your normal household waste.

▶ Instead, bring the product and any batteries to a collec-

tion centre for batteries and electrical or electronic appli-

ances.

11.2 Arranging disposal of coolant

Warning.

Risk of damage to the environment.

This heat pump contains R 410 A coolant.

The coolant must not be allowed to escape

into the atmosphere. R 410 A is a fluorinated

greenhouse gas covered by the Kyoto Pro-

tocol, with a GWP of 1725 (GWP = Global

Warming Potential).

▶ Before the product is disposed of, have

the coolant which it contains completely

drained into a suitable vessel so that it

can then be recycled or disposed of in

accordance with regulations.

The competent person who installed the heat pump must

dispose of the coolant.

Personnel who are approved for energy recovery must have

the relevant certification that corresponds to the valid regula-

tions.

Appendix

0020147164_04 aroTHERM Installation instructions 29

Appendix

A Overview of accessories

System diagrams

8E 8F 9B* 9A* 10A 10B 10C 11A*

12A** 12B**

Auxiliary heat generator

VWZ MEH 60 X X X X

VWZ MEH 61

Heat generator X X X X

Heat generator without

eBUS/external heat

generator

Frost protection

Without heat exchanger X X X X X X

VWZ MWT 150 X X X X

Decoupling/cylinder

Without decoupling module X X X X X

VWZ MPS 40 X X X X

External cylinder X

Hot water generation

Heat generator with hot

water generation

Domestic hot water cylinder X X X X X

Solar-powered domestic hot

water cylinder

Bivalent domestic hot water

cylinder (heat pump and heat

generator)

X X

Zone/heating circuit con-

trol

1-zone/heating circuit X X X

2-zone/heating circuit X X X X X

1- or 2-zone/heating circuit X X

*) With VR470/4 only

**) If the installation is not carried out correctly and no auxiliary heat generator is installed, this may affect the comfort level.

Appendix

30 Installation instructions aroTHERM 0020147164_04

B System diagrams

B.1 System diagram 8 E

P2 P1

42a

VF1

13h

13e

42a

42b

2 BUS

3(5)

2 BUS2 BUS

2 BUS

230 V ~ 3

230 V ~

230(400) V ~

1 Heat generator

2 Hear generator pump

3 Heat pump

10 Thermostatic radiator valve

13e System controller

13h Bus coupler

16 Outside temperature sensor/DCF receiver

32 Cap valve

Appendix

0020147164_04 aroTHERM Installation instructions 31

38 Diverter valve

42a Expansion relief valve

42b Diaphragm expansion tank

43 Safety group – drinking water connection

50 Differential-pressure bypass valve

91 VWZ AI VWL X/2 heat pump control module

93 VWZ MPS 40 compact buffer cylinder

KW Cold water

VF1 Flow temperature sensor 1

Appendix

32 Installation instructions aroTHERM 0020147164_04

B.2 System diagram 8 F

P2 P1

42c

42a

SP2

13a

VF1

3030

13b

SP1

KOL1-P

42b

42a

Ertrag

KOL1

13g

13e

(HK1-P)

(HK2-P)

42a

UV1

42b

Auf

3(5)

2 BUS

3(5)

2 BUS

230 V ~

2 BUS

3 230 V ~

2 BUS

3 230 V ~

2 BUS

230(400) V ~

3 Heat pump

5 Domestic hot water cylinder

13a Remote control unit

13b Mixer module

13e System controller

13g Solar module

16 Outside temperature sensor/DCF receiver

19 Maximum thermostat

25 Solar pump unit

28 Zone valve

30 Non-return valve

32 Cap valve

Appendix

0020147164_04 aroTHERM Installation instructions 33

39 Thermostat mixing valve

42a Expansion relief valve

42b Diaphragm expansion tank

42c Diaphragm expansion tank – drinking water

43 Safety group – drinking water connection

48 Pressure gauge

50 Differential-pressure bypass valve

52 Individual room control valve

58 Fill and drain valve

63 VFK solar flat collector

64 Solar in-line vessel

65 Collecting container

91 VWZ AI VWL X/2 auxiliary module

94 VWZ MEH 60 auxiliary heating module

HK1-P Heating pump 1

HK2-P Heating pump 2

KOL1 Collector temperature sensor for collector field 1

KOL1-

Solar pump for collector field 1

KW Cold water

SP1 Cylinder temperature sensor

SP2 Cylinder temperature sensor (solar cylinder)

VF1 Flow temperature sensor 1

ZP Circulation pump

Appendix

34 Installation instructions aroTHERM 0020147164_04

B.3 System diagram 10 B

P2 P1

42c

42a

SP1

13a

VF1

13b

13e

(HK1-P)

(HK2-P)

42a

UV1

42b

MA1

(HK-P)

Auf

3(5)

2 BUS

3(5)

2 BUS2 BUS

230 V ~ 3

3(5)

2 BUS

3 230 V ~

2 BUS

230(400) V ~

VF2

1b Auxiliary heater for hot water support

3 Heat pump

5 Domestic hot water cylinder

13a Remote control unit

13b Mixer module

13e System controller

16 Outside temperature sensor/DCF receiver

19 Maximum thermostat

28 Zone valve

30 Non-return valve

32 Cap valve

40 Heat exchanger

Appendix

0020147164_04 aroTHERM Installation instructions 35

42a Expansion relief valve

42b Diaphragm expansion tank

42c Diaphragm expansion tank – drinking water

43 Safety group – drinking water connection

48 Pressure gauge

50 Differential-pressure bypass valve

52 Individual room control valve

65 Collecting container

91 VWZ AI VWL X/2 auxiliary module

92 VWZ MWT 150 heat exchanger module

94 VWZ MEH 60 auxiliary heating module

HK-P Heating pump 1

HK1-P Heating pump 1

HK2-P Heating pump 2

KW Cold water

MA Multi-relay output

UV1 Diverter valve 1

SP1 Cylinder temperature sensor

VF1 Flow temperature sensor 1

VF2 Flow temperature sensor 2

ZP Circulation pump

Appendix

36 Installation instructions aroTHERM 0020147164_04

B.4 System diagram 12 A

P2 P1

42c

42a

SP1

13a

VF1

13e

28(MA1) 28(MA2)

42a

UV1

42b

Auf

3(5)

2 BUS

3(5)

2 BUS2 BUS

230 V ~ 3

2 BUS

3(5)

230(400) V ~

1b Auxiliary heater for hot water support

3 Heat pump

5 Domestic hot water cylinder

13a Remote control unit

13e System controller

16 Outside temperature sensor/DCF receiver

19 Maximum thermostat

28 Zone valve

32 Cap valve

42a Expansion relief valve

42b Diaphragm expansion tank

42c Diaphragm expansion tank – drinking water

Appendix

0020147164_04 aroTHERM Installation instructions 37

43 Safety group – drinking water connection

48 Pressure gauge

50 Differential-pressure bypass valve

52 Individual room control valve

91 VWZ AI VWL X/2 auxiliary module

94 VWZ MEH 60 auxiliary heating module

KW Cold water

UV1 Diverter valve 1

VF1 Flow temperature sensor 1

C Wiring diagrams

C.1 Wiring diagram 8 E

UV1

MA2

MA1

230 V~

EVU

SP1

DCF/AF

VF1

BUS

230 V~

Auf

DCF 0 AF

VRC 470

13e

VF1

230 V~

X41

230 V~

DCF

230 V~

eBUS

13h

VR32

VWZ AI VWL X/2

VWL x5/2 A 230 V

EBUS

FLOOR HX7

230 V~

400 V~

VWL x5/2 A 400 V

DCF

3,3 V / 5 V /

24 V

X31

VCW

1 Heat generator

3 Heat pump

13e System controller

13h Bus coupler

16 Outside temperature sensor/DCF receiver

91 VWZ AI VWL X/2 auxiliary module

VF1 Flow temperature sensor 1

Appendix

38 Installation instructions aroTHERM 0020147164_04

C.2 Wiring diagram 8 F

UV1

MA2

MA1

230 V~

EVU

SP1

DCF/AF

VF1

BUS

230 V~

Auf

L1 L2

PE N N

400 V~

230 V~

DCF 0 AF

VRC 470

13e

13b

230 V~

BUS

VF2

VWZ AI VWL X/2

VWZ MEH 60

VR 61

VR 81

13a

VF2

LEG-P

KOL1-P

230 V~

3,3 V / 5 V / 24 V

13g

230 V~

BUS

KOL1

VR 68

SP1

SP2

Ertrag

TD1

TD2

230 V~

KOL1-P

KOL1

SP1

SP2

Ertrag

VWL x5/2 A 230 V

EBUS

FLOOR HX7

230 V~

400 V~

VWL x5/2 A 400 V

DCF

3,3 V / 5 V /

24 V

HK1-P

230 V~

HK2-P

HK2

HK2-P

LP/ZP

Auf

HK1-P

VF1

3 Heat pump

13a Remote control unit

13b Mixer module

13e System controller

13g Solar module

16 Outside temperature sensor/DCF receiver

19 Maximum thermostat

91 VWZ AI VWL X/2 auxiliary module

94 VWZ MEH 60 auxiliary heating module

HK1-P Heating pump 1

HK2-P Heating pump 2

KOL1 Collector temperature sensor for collector field 1

Appendix

0020147164_04 aroTHERM Installation instructions 39

KOL1-

Solar pump for collector field 1

SP1 Cylinder temperature sensor

SP2 Cylinder temperature sensor (solar cylinder)

VF1 Flow temperature sensor 1

ZP Circulation pump

C.3 Wiring diagram 10 B

UV1

MA2

MA1

230 V~

EVU

SP1

DCF/AF

VF1

BUS

230 V~

Auf

L1 L2

PE N N

400 V~

DCF 0 AF

VRC 470

13e

13b

230 V~

BUS

VF2

VR 61

VR 81

13a

VWZ AI VWL X/2

UV1

VF1

VWZ MEH 60

230 V~

VF2

UV1

SP1

HK-P

VWZ MWT 150

VWL x5/2 A 230 V

EBUS

FLOOR HX7

230 V~

400 V~

VWL x5/2 A 400 V

DCF

3,3 V / 5 V /

24 V

28 (HK2-P)

28 (HK1-P)

HK1-P

230 V~

HK2

HK2-P

LP/ZP

Auf

230 V~

3 Heat pump

13a Remote control unit

13b Mixer module

13e System controller

Appendix

40 Installation instructions aroTHERM 0020147164_04

16 Outside temperature sensor/DCF receiver

19 Maximum thermostat

91 VWZ AI VWL X/2 auxiliary module

92 VWZ MWT 151 heat exchanger module

94 VWZ MEH 60 auxiliary heating module

HK-P Heating pump 1

HK1-P Heating pump 1

HK2-P Heating pump 2

UV1 Diverter valve 1

SP1 Cylinder temperature sensor

VF1 Flow temperature sensor 1

VF2 Flow temperature sensor 2

ZP Circulation pump

C.4 Wiring diagram 12 A

UV1

MA2

MA1

230 V~

EVU

SP1

DCF/AF

VF1

BUS

230 V~

Auf

DCF 0 AF

VWZ AI VWL X/2

UV1

230 V~

SP1

VWL x5/2 A 230 V

EBUS

FLOOR HX7

230 V~

400 V~

VWL x5/2 A 400 V

L1 L2

PE N N

400 V~

VF1

VWZ MEH 60

28 (MA2)

28 (MA1)

VRC 470

13e

VR 81

13a

DCF

3,3 V / 5 V /

24 V

3 Heat pump

13a Remote control unit

13e System controller

16 Outside temperature sensor/DCF receiver

19 Maximum thermostat

28 Zone valve

91 VWZ AI VWL X/2 auxiliary module

94 VWZ MEH 60 auxiliary heating module

UV1 Diverter valve

SP1 Cylinder temperature sensor

VF1 Flow temperature sensor

Appendix

0020147164_04 aroTHERM Installation instructions 41

D Heat pump schematic

D.1 Heat pump schematic drawing (VWL 55/2 A 230 V)

PZHH

TCE

20+

1 Flow heating circuit temperature sensor

2 Return heating circuit temperature sensor

3 High-efficiency pump with flow sensor

4 Expansion vessel (not for Vaillant)

5 Drain valve

6 Purging valve

7 Fan

8 Air inlet temperature sensor

9 Ribbed pipe heat exchanger

10 Temperature sensor of the ribbed pipe heat exchanger

11 4-way valve

12 Plate heat exchanger

13 Temperature sensor after the plate heat exchanger

14 Service valve for the high-pressure range of the coolant

circuit

15 High-pressure pressure switch in the coolant circuit

16 High-pressure sensor in the coolant circuit

17 Compressor outlet temperature sensor

18 Rotary piston compressor

19 Filter

20 Liquid separator

21 Electronic expansion valve

22 Compressor inlet temperature sensor

23 Service valve for the low-pressure range of the coolant

circuit

24 Filter

25 Fluid collector

Appendix

42 Installation instructions aroTHERM 0020147164_04

D.2 Heat pump schematic drawing (VWL 85/2 A 230 V)

PZHH

TCE

20+

1 Flow heating circuit temperature sensor

2 Return heating circuit temperature sensor

3 High-efficiency pump with flow sensor

4 Expansion vessel (not for Vaillant)

5 Drain valve

6 Purging valve

7 Fan

8 Air inlet temperature sensor

9 Ribbed pipe heat exchanger

10 Temperature sensor of the ribbed pipe heat exchanger

11 4-way valve

12 Plate heat exchanger

13 Temperature sensor after the plate heat exchanger

14 Service valve for the high-pressure range of the coolant

circuit

15 High-pressure pressure switch in the coolant circuit

16 High-pressure sensor in the coolant circuit

17 Compressor outlet temperature sensor

18 Rotary piston compressor

19 Filter

20 Liquid separator

21 Electronic expansion valve

22 Compressor inlet temperature sensor

23 Service valve for the low-pressure range of the coolant

circuit

24 Filter

25 Gas buffer

26 Flow rate limiter (cooling mode)

Appendix

0020147164_04 aroTHERM Installation instructions 43

D.3 Heat pump schematic drawing (VWL 115/2 A 230 V)

PZHH

TCE

20+

1 Flow heating circuit temperature sensor

2 Return heating circuit temperature sensor

3 High-efficiency pump with flow sensor

4 Expansion vessel (not for Vaillant)

5 Drain valve

6 Purging valve

7 Fan

8 Air inlet temperature sensor

9 Ribbed pipe heat exchanger

10 Temperature sensor of the ribbed pipe heat exchanger

11 4-way valve

12 Plate heat exchanger

13 Temperature sensor after the plate heat exchanger

14 Service valve for the high-pressure range of the coolant

circuit

15 High-pressure pressure switch in the coolant circuit

16 High-pressure sensor in the coolant circuit

17 Compressor outlet temperature sensor

18 Rotary piston compressor

19 Filter

20 Liquid separator

21 Electronic expansion valve

22 Compressor inlet temperature sensor

23 Service valve for the low-pressure range of the coolant

circuit

24 Filter

25 Gas buffer

Appendix

44 Installation instructions aroTHERM 0020147164_04

D.4 Heat pump schematic drawing (VWL 155/2 A 230 V)

PZHH

TCE

20+

1 Flow heating circuit temperature sensor

2 Return heating circuit temperature sensor

3 High-efficiency pump with flow sensor

4 Expansion vessel (not for Vaillant)

5 Drain valve

6 Purging valve

7 Fan

8 Air inlet temperature sensor

9 Ribbed pipe heat exchanger

10 Temperature sensor of the ribbed pipe heat exchanger

11 4-way valve

12 Plate heat exchanger

13 Temperature sensor after the plate heat exchanger

14 Service valve for the high-pressure range of the coolant

circuit

15 High-pressure pressure switch in the coolant circuit

16 High-pressure sensor in the coolant circuit

17 Compressor outlet temperature sensor

18 Rotary piston compressor

19 Filter

20 Liquid separator

21 Electronic expansion valve

22 Compressor inlet temperature sensor

23 Service valve for the low-pressure range of the coolant

circuit

24 Filter

25 Gas buffer

E Heat pump setting parameters

Note

If repairs are carried out on the heat pump electronics (e.g. replacing the PCB), you must reset the parameters.

Appendix

0020147164_04 aroTHERM Installation instructions 45

Parameter Explanation Default

setting

Adjustment

range

Own setting

Language Select the required language here. 02 English 01 Deutsch

02 English

03 Français

04 Italiano

05 Dansk

07 Castellano

08 Türkçe

09 Magyar

11 Українська

15 Svenska

16 Norsk

18 Čeština

19 Hrvatski

20 Slovenčina

22 Slovenščina

Contact

details

As a competent person, you can enter your telephone num-

ber here. The end customer can read this number in the

menu → Information.

Max. remain-

ing heating

circuit feed

head

Limiting the remaining heating circuit feed head. If the value

is reduced, the pump speed is reduced as far as necessary

in order to prevent the remaining feed head from being

exceeded.

Maximum

value

≥ 100 mbar

Max. remain-

ing hot water

feed head

Limiting the remaining hot water circuit feed head. If the

value is reduced, the pump speed is reduced as far as ne-

cessary in order to prevent the remaining feed head from

being exceeded.

Maximum

value

≥ 100 mbar

Max. dura-

tion of the

power inter-

ruption

If the set value is exceeded when the power supply is dis-

connected, fault messages F.103, F.752 or F.753 may be

displayed.

If the heat pump is to be operated in the normal or spe-

cial tariff, set the value to 3 h in the special tariff during

installation.

0 h 0 - 99 h

F Technical data

Note

The following performance data is only applicable to new products with clean heat exchangers.

Technical data – General

VWL 55/2 A

230 V

VWL 85/2 A

230 V

VWL 115/2 A

230 V

VWL 155/2 A

230 V

Heat pump type

Monoblock

air/water heat

pump

Monoblock

air/water heat

pump

Monoblock

air/water heat

pump

Monoblock

air/water heat

pump

Flow/return heating con-

nections, boiler side

1 1/4" 1 1/4" 1 1/4" 1 1/4"

Product dimensions,

width

970 mm 1,103 mm 1,103 mm 1,103 mm

Product dimensions,

height

834 mm 975 mm 975 mm 1,375 mm

Product dimensions,

depth

408 mm 463 mm 463 mm 463 mm

Net weight

90 kg 106 kg 126 kg 165 kg

Hydraulic lines material

Copper Copper Copper Copper

Hydraulic connections

material

Brass Brass Brass Brass

Hydraulic seals material

EPDM EPDM EPDM EPDM

Appendix

46 Installation instructions aroTHERM 0020147164_04

VWL 55/2 A

230 V

VWL 85/2 A

230 V

VWL 115/2 A

230 V

VWL 155/2 A

230 V

Plate heat exchanger ma-

terial

AISI 304

stainless steel

AISI 304

stainless steel

AISI 304

stainless steel

AISI 304

stainless steel

Pump casing material

Painted cast

iron

Painted cast

iron

Painted cast

iron

Painted cast

iron

Pollution rating

2 2 2 2

Electric connection

230 V/50 Hz 230 V/50 Hz 230 V/50 Hz 230 V/50 Hz

Fuse type

T4A T4A T4A T4A

Inverter controller fuse

HRC 20 A 550

HRC 32 A 550

Level of protection

IP 25 IP 25 IP 25 IP 25

Maximum start-up cur-

rent

16 A 16 A 20 A 25 A

Maximum current con-

sumption

16 A 16 A 20 A 25 A

Pump power consump-

tion

15 … 70 W 15 … 70 W 15 … 70 W 6 … 87 W

Fan power consumption

15 … 42 W 15 … 42 W 15 … 76 W 15 … 76 W

Note

2 x

Electrical classification

I I I I

Overvoltage category

II II II II

Fan rotational speed

550 rpm 550 rpm 700 rpm 600 rpm

Sound power level for

A7W35 according to EN

12102 and EN ISO 9614-1

58 dB(A) 60 dB(A) 65 dB(A) 65 dB(A)

Sound power level for

A7W45 according to EN

12102 and EN ISO 9614-1

59 dB(A) 60 dB(A) 65 dB(A) 65 dB(A)

Sound power level for

A7W55 according to EN

12102 and EN ISO 9614-1

61 dB(A) 61 dB(A) 66 dB(A) 66 dB(A)

Maximum cylinder tem-

perature

60 ℃ 63 ℃ 63 ℃ 63 ℃

Minimum air temperature

(heating and cylinder

charging)

−15 ℃ −20 ℃ −20 ℃ −20 ℃

Maximum air temperature

(heating)

28 ℃ 28 ℃ 28 ℃ 28 ℃

Max. air temperature (cyl-

inder charging)

46 ℃ 46 ℃ 46 ℃ 46 ℃

Max. air flow

2,000 m³/h 2,700 m³/h 3,400 m³/h 5,500 m³/h

Technical data – Heating circuit

VWL 55/2 A

230 V

VWL 85/2 A

230 V

VWL 115/2 A

230 V

VWL 155/2 A

230 V

Minimum operating pres-

sure

0.1 MPa

(1.0 bar)

0.1 MPa

(1.0 bar)

0.1 MPa

(1.0 bar)

0.1 MPa

(1.0 bar)

Maximum operating pres-

sure

0.3 MPa

(3.0 bar)

0.3 MPa

(3.0 bar)

0.3 MPa

(3.0 bar)

0.3 MPa

(3.0 bar)

Heating circuit water con-

tents in the heat pump

1.1 l 1.6 l 2.1 l 2.7 l

Minimum heating circuit

water contents

17 l 21 l 35 l 60 l

Min. volume flow rate

380 l/h 380 l/h 540 l/h 1,200 l/h

Appendix

0020147164_04 aroTHERM Installation instructions 47

VWL 55/2 A

230 V

VWL 85/2 A

230 V

VWL 115/2 A

230 V

VWL 155/2 A

230 V

Nominal volume flow

rate, max. volume flow

rate

860 l/h 1,400 l/h 1,900 l/h 2,590 l/h

Hydraulic pressure differ-

ence

640 mbar 450 mbar 300 mbar 370 mbar

Technical data – Coolant circuit

VWL 55/2 A

230 V

VWL 85/2 A

230 V

VWL 115/2 A

230 V

VWL 155/2 A

230 V

Coolant type

R410A R410A R410A R410A

Coolant contents

1.80 kg 1.95 kg 3.53 kg 4.40 kg

Maximum permissible

operating overpressure

4.15 MPa

(41.50 bar)

4.15 MPa

(41.50 bar)

4.15 MPa

(41.50 bar)

4.15 MPa

(41.50 bar)

Compressor type

Rotary piston Rotary piston Rotary piston Rotary piston

Oil type

Specific

polyvinyl ether

(PVE)

Specific

polyvinyl ether

(PVE)

Specific

polyvinyl ether

(PVE)

Specific

polyvinyl ether

(PVE)

Coolant circuit control

system

Electronic Electronic Electronic Electronic

Technical data – Heat pump system performance data

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 output A-7/W35

4.90 kW 6.70 kW 7.90 kW 11.80 kW

A-7/W35 output figure/EN

14511 coefficient of per-

formance

2.40 2.80 2.50 2.60

A7/W35 heating output

4.70 kW 8.10 kW 10.50 kW 14.60 kW

A7/W35 output figure/EN

14511 coefficient of per-

formance

4.70 4.80 4.20 4.50

Power consumption ef-

fective at A7/W35

1.10 kW 1.80 kW 2.50 kW 3.40 kW

Input current at A7/W35

4.80 A 7.80 A 10.90 A 14.80 A

A7/W45 heating output

4.40 kW 7.80 kW 10.20 kW 13.40 kW

A7/W45 output figure/EN

14511 coefficient of per-

formance

3.40 3.80 3.40 3.40

Power consumption ef-

fective at A7/W45

1.30 kW 2.10 kW 3.00 kW 4.10 kW

Input current at A7/W45

5.70 A 9.10 A 13.00 A 17.80 A

A7/W55 heating output

4.20 kW 7.00 kW 9.80 kW 11.20 kW

A7/W55 output figure/EN

14511 coefficient of per-

formance

2.70 3.00 2.90 2.30

Power consumption ef-

fective at A7/W55

1.60 kW 2.40 kW 3.50 kW 5.00 kW

Input current at A7/W55

7.00 A 10.40 A 15.20 A 21.70 A

Appendix

48 Installation instructions aroTHERM 0020147164_04

G Overview of fault codes

Code Meaning Cause

F.022 Water pressure too low Insufficient water in the heating system

F.037 Fan fault – Obstruction in the product's air guiding

– Fan motor not connected or faulty

– The connection between the main PCB and the fan PCB is dam-

aged or broken.

F.042 Fault: Coding resistance – The product's coding resistance is missing or is faulty

– Coding resistance value outside the permissible range

– X25 plug not connected or was connected incorrectly

F.073 Fault: Water pressure sensor Line to water pressure sensor is broken or has a short circuit

F.086 Contact thermostat has opened. – Underfloor heating temperature too high

– Heating circuit flow rate too low

– Underfloor heating circuit is closed

F.103 Fault: Spare part detection – The main PCB that is fitted as a spare part or the inverter does

not match the product

– The "Max. duration power supply cut-off" parameter has been

set poorly (see the "Heat pump setting parameters" section in

the appendix).

F.514 Sensor fault: Comp. inlet temp.

– Sensor is faulty or incorrectly connected to the main PCB

F.517 Sensor fault: Comp. outlet temp.

F.519 Sensor fault: Return temperature

F.520 Sensor fault: Flow temperature

F.523 Sensor fault: VF1 Line to VF1 temperature sensor is broken or has a short circuit.

F.526

Sensor fault: Temp. environment circuit EEV

Sensor is faulty or incorrectly connected to the main PCB

F.532 Building circuit: Flow rate too low – Pump faulty

Check the specific flow rate in the heating circuit during the

sensor/actuator test

– Between 7000 and 7700 l/h: The power supply is not suffi-

cient

– Between 7700 and 8200 l/h: The pump runs dry (no water in

the heating circuit; the heating circuit loses water)

– Between 8200 and 8700 l/h: Fault in the electronics

– Between 8700 and 9200 l/h: The pump is blocked

– Between 9200 and 10,000 l/h: No PWM signal (cable faulty

or not connected; fault in the main PCB)

– Pump faulty

– Pump cabling faulty

– Low water pressure

– Dirt filter in the heating circuit return is missing or blocked

– Heating circuit not fully purged

– Pressure loss in the heating circuit too high

F.536 Compressor outlet temp. too high – Coolant quantity too low

– Sensor is faulty or incorrectly connected to the main PCB

– Premature expansion in the liquid area of the coolant circuit (loss

of charge)

– Electronic expansion valve faulty

– Heat exchanger blocked

1) Sensor on the evaporator

2) Sensor on the condenser

Appendix

0020147164_04 aroTHERM Installation instructions 49

Code Meaning Cause

F.537 High-pressure switch open – Coolant volume too high or too low

– Vacuum insufficient (10 mbar)

– Incondensable particle in the coolant circuit

– Pressure switch or electrical connection faulty

– Premature expansion in the liquid area of the coolant circuit (loss

of charge)

– Flow quantity too high (see defined maximum flow rate)

– Flow rate monitor faulty

– Insufficient heat transfer in the heat exchanger

F.539 Coolant pressure too low – Coolant quantity too low

– Air flow too low

– No thawing

– The resistance heating in the condensate receiver is faulty.

– 4-way valve faulty

– Electronic expansion valve motor faulty, or connection faulty

F.546 Sensor fault: High pressure – Faulty cabling

F.554 Coolant pressure not in operating range – Coolant volume too high or too low

– Incondensable particle in the coolant circuit

– Electronic expansion valve faulty

– Premature expansion in the liquid area of the coolant circuit (loss

of charge)

– Flow quantity too high (see defined maximum flow rate)

– Insufficient heat exchange in the plate heat exchanger or the

ribbed pipe heat exchanger

– 4-way valve faulty

F.582 EEV fault – Cable insulation faulty

– Connection broken

F.585

Sensor fault: Temp. building circuit EEV

– Sensor is faulty or incorrectly connected to the main PCB

F.685 Communication fault: eBUS – The product is not connected to the controller

– Polarity inverted

F.750 Connection fault: Compressor – Cable insulation faulty

– Connection broken

F.751 Compressor: Overcurrent fault – The product's voltage supply is too low

– The ribbed pipe heat exchanger or heat exchanger is dirty

F.752 Fault: Inverter – Inverter box damaged

– The cooler inverter box is blocked.

– Faulty voltage supply

– The "Max. duration power supply cut-off" parameter has been

set poorly (see the "Heat pump setting parameters" section in

the appendix).

F.753 Connection fault: Inverter not recognised – The connection between the main PCB and the inverter box is

damaged or broken.

– The inverter box is not switched on.

– The "Max. duration power supply cut-off" parameter has been

set incorrectly (see the "Heat pump setting parameters" section

in the appendix).

F.754 Fault: Fan unit – The connection between the main PCB and the fan PCB is dam-

aged or broken.

– The fan PCB is faulty

F.755 Fault: 4-way valve position incorrect Mechanical or electrical problem. Move the 4-way valve away from

the controller. When moving it, check that the coil voltage is correct.

F.774 Sensor fault: Air inlet temperature – The temperature sensor is faulty or incorrectly connected to the

main PCB.

F.1288 Fault: SP1 cylinder temperature sensor Sensor is faulty or has not been correctly connected to the VWZ AI

heat pump control module.

Connection fault: Accessory modules Fault in the VWZ AI heat pump control module (the connection

between the display and the main PCB is faulty).

1) Sensor on the evaporator

2) Sensor on the condenser

Appendix

50 Installation instructions aroTHERM 0020147164_04

Code Meaning Cause

Connection fault: Heat pump The eBUS connection between the heat pump and the VWZ AI heat

pump control module is faulty.

1) Sensor on the evaporator

2) Sensor on the condenser

For further technical information, please call 0844 6933 133.

Index

0020147164_04 aroTHERM Installation instructions 51

Index

Actuator test ........................................................................ 27

Back

Cleaning......................................................................... 26

Cable duct ........................................................................... 18

CE label................................................................................. 4

Connection diagram ............................................................ 19

Documents ............................................................................ 7

Electrical diagram................................................................19

Electricity ...............................................................................3

Filling ................................................................................... 23

Front

Cleaning......................................................................... 26

Function menu.....................................................................27

Heating water

Preparing ....................................................................... 22

Hot water temperature........................................................... 3

Identification plate ................................................................. 9

Installer level ....................................................................... 21

Live Monitor

Calling up....................................................................... 21

Manual

Applicability...................................................................... 7

Product

Unpacking...................................................................... 10

Regulations ........................................................................... 4

Risk of scalding .....................................................................3

Safety devices..................................................................... 7

Expansion relief valve......................................................3

Expansion vessel.............................................................3

Sensor/actuator test ............................................................ 27

Setting the language ...........................................................21

Side casing

Removing....................................................................... 14

Spare parts..........................................................................25

Statistics

Calling up....................................................................... 21

Terminal connection diagram.............................................. 19

Tool ....................................................................................... 4

Voltage .................................................................................. 3

0020147164_04 05.05.2014

Vaillant Ltd

Nottingham Road Belper Derbyshire DE56 1JT

Telephone 44 84 56 02 29 22 Vaillant Service Solutions 44 807 06 06 07 77

Spares Technical Enquiries 44 17 73 59 66 15

info@vaillant.co.uk technicalspares@groupservice.co.uk

www.vaillant.co.uk

the manufacturer's written consent.

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