STIEBEL ELTRON LWZ 70 E Operation And Installation

OPERATION AND INSTALLAT ION

Central ventilation unit with heat recovery

» LWZ70E

2 | LWZ70E www.stiebel-eltron.com

CONTENTS | SPECIAL INFORMATION

SPECIAL INFORMATION

OPERATION

1. General information ��3

1.1 Safety instructions �� 3

1.2 Other symbols in this documentation �� 3

1.3 Units of measurement �� 3

1.4 Standardised output data �� 3

2. Safety �� 3

2.1 Intended use �� 3

2.2 General safety instructions �� 4

2.3 Test symbols �� 4

3. Appliance description ��4

4. Settings ��4

4.1 Remote control �� 4

4.2 User interface on the appliance�� 4

4.3 Switching the appliance on �� 5

4.4 Switching off the appliance �� 5

4.5 Standard mode �� 6

5. Maintenance, cleaning and care ��7

5.1 Replacement ﬁlter �� 7

5.2 Cleaning ﬁlters �� 7

6. Troubleshooting ��8

6.1 Fault analysis �� 8

6.2 Fault code �� 8

INSTALLATION

7. Safety �� 9

7.1 General safety instructions �� 9

7.2 Instructions, standards and regulations �� 9

7.3 Operation of the appliance in buildings with combustion equipment �� 9

8. Appliance description �� 10

8.1 Standard delivery �� 10

8.2 Required accessories ��10

8.3 Further accessories�� 10

9. Preparations �� 10

9.1 Installation site �� 10

9.2 Transport �� 10

10. Installation �� 10

10.1 Mounting the appliance ��10

10.2 Connecting the condensate drain �� 11

10.3 Connecting air ducts �� 11

10.4 Power supply �� 12

11. Commissioning �� 12

11.1 Initial start-up �� 12

11.2 Shutdown ��12

11.3 Recommissioning �� 12

12. Settings �� 13

12.1 Settings menu �� 13

12.2 Read-out menu ��14

12.3 Service menu �� 15

12.4 Restoring factory settings �� 16

SPECIAL INFORMATION

- The appliance may be used by children aged8 and up and persons with reduced physical, sensory or mental capabilities or a lack of experience and know-how, provided that they are supervised or they have been instructed on how to use the appliance safely and have understood the resulting risks. Children must never play with the appliance. Children must never clean the appliance or perform user maintenance unless they are supervised.

- The power cable must only be replaced (for example if damaged) by qualiﬁed contractors authorised by the manufacturer.

- Secure the appliance as described in chapter "Installation/ Installation".

13. Maintenance �� 16

14. Troubleshooting �� 18

15. Speciﬁcation �� 19

15.1 Dimensions and connections �� 19

15.2 Standard circuit �� 20

15.3 Wiring diagram �� 21

15.4 Fan diagram ��22

15.5 Data table �� 23

GUARANTEE

ENVIRONMENT AND RECYCLING

OPERATION

General information

ENGLISH

www.stiebel-eltron.com LWZ70E | 3

OPERATION

1. General information

The chapters "Special Information" and "Operation" are intended for both the user and qualiﬁed contractors.

The chapter "Installation" is intended for qualiﬁed contractors.

Note

Read these instructions carefully before using the appliance and retain them for future reference. Pass on the instructions to any new user where appropriate.

1.1 Safety instructions

1.1.1 Structure of safety instructions

!

KEYWORD Type of risk Here, possible consequences are listed that may result from failure to observe the safety instructions.

 Steps to prevent the risk are listed.

1.1.2 Symbols, type of risk

Symbol Type of risk

Injury

Electrocution

Burns (burns, scalding)

1.1.3 Keywords

KEYWORD Meaning

DANGER Failure to observe this information will result in serious

injury or death.

WARNING Failure to observe this information may result in serious

injury or death.

CAUTION Failure to observe this information may result in non-seri-

ous or minor injury.

1.2 Other symbols in this documentation

Note

General information is identiﬁed by the adjacent symbol.

 Read these texts carefully.

Symbol Meaning

Material losses (appliance damage, consequential losses and environmental pollution)

Symbol Meaning

Appliance disposal

 This symbol indicates that you have to do something. The ac-

tion you need to take is described step by step.

1.3 Units of measurement

Note

All measurements are given in mm unless stated otherwise.

1.4 Standardised output data

Explanations to determine and interpret the speciﬁed standardised output data

1.4.1 Standard: DINEN 13141-7

The output data speciﬁcally mentioned in text, diagrams and technical datasheets has been determined in line with the test conditions described in the standard shown in the heading of this chapter.

Generally, these standardised test conditions will not fully meet the conditions found at the installation site of the system user. Depending on the chosen test method and the extent to which the selected method deviates from the conditions described in the standard shown in the heading of this chapter, any deviations can have a considerable impact. Further factors that have an inﬂuence on the test values are the measuring equipment, the system conﬁguration, the age of the system and the ﬂow rates.

A conﬁrmation of the speciﬁed output data can only be obtained if the conditions applicable to the relevant test match those of the standard shown in the heading of this chapter.

2. Safety

2.1 Intended use

The appliance is designed as a mechanical ventilation unit with centralised supply air and extract air routing.

This appliance is intended for domestic use. It can be used safely by untrained persons. The appliance can also be used in a non-domestic environment, e.g.in a small business, as long as it is used in the same way.

Any other use beyond that described shall be deemed inappropriate. Observation of these instructions and of instructions for any accessories used is also part of the correct use of this appliance.

It is deemed inappropriate to:

- Use extract air loaded with grease, explosive gases, dust or adhesive aerosols

- Install the unit outdoors

- Connect cooker hoods and dryer exhausts to the ventilation system.

Never adjust the setting of supply and extract air valves inside the rooms. These have been set up by a qualiﬁed contractor during

commissioning.

!

OPERATION

Appliance description

4 | LWZ70E www.stiebel-eltron.com

2.2 General safety instructions

!

WARNING Injury The appliance may be used by children aged 8 and up and persons with reduced physical, sensory or mental capabilities or a lack of experience and know-how, provided that they are supervised or they have been instructed on how to use the appliance safely and have understood the resulting risks. Children must never play with the appliance. Children must never clean the appliance or perform user maintenance unless they are supervised.

Note

Trouble-free operation of the appliance is only possible with a closed appliance cover.

2.3 Test symbols

See type plate on the appliance.

3. Appliance description

The appliance draws in outdoor air with a fan. A second fan draws in extract air from rooms in the home with odour or humidity loads (kitchen, bathroom and WC). Extract air and outdoor air are routed through separate ducts. Extract air and outdoor air are ﬁltered by separate ﬁlters.

Both air streams are routed through a cross-countercurrent heat exchanger. The extract air gives off heat, which is transferred to the outdoor air. This means that the extracted stale indoor air heats the fresh clean outdoor air, saving energy and routing fresh air into the interior.

You can use the user interface to inﬁnitely adjust the air ﬂow rates. The appliance has a ﬁlter service indicator, as well as an optional ﬁlter service indicator at the stage switch.

The control unit has three fan stages. The air ﬂow rate is preset for each fan stage by the qualiﬁed contractor. Constant ﬂow rate control ensures that the air ﬂow rates of the supply air and extract air are achieved irrespective of the duct pressure.

Fan stage

Humidity protection ventilation: This fan stage prevents mould formation using the factory-set air flow rate of 50m³/h. Alternatively, the contractor can set an air flow rate of 0m³/h when commissioning the appliance. In such a case, no humidity protection is provided.

Fan stage1 should be seen as background ventilation, to be se-

lected when going away for example.

Fan stage2 is recommended for standard ventilation.

Fan stage3 is recommended as intensive ventilation, to temporarily increase the air flow rate for load peaks (e.g. as a party stage).

Frost protection

On account of the high heat recovery level, low outdoor temperatures result in the extract air being cooled down so severely that any condensate that is created in the process may freeze. Frost protection ensures that the extract air side of the heat exchanger cannot freeze. Depending on the outdoor air temperature and the pressure drop at the heat exchanger, the balance between

the supply air ﬂow and the extract air ﬂow is disrupted, thus preventing freezing. The supply air fan may also, for short periods, be switched OFF at very low outdoor temperatures. Preheating the outdoor air by using an electric preheating coil or by means of a geothermal heat exchanger, for example, can prevent this imbalance or can prevent the supply air fan shutting down.

Bypass function

The appliance is equipped with a bypass function. If the conditions for the bypass function are met, the ventilation air fan is switched off. This enables warm indoor air to be transported away. Once the conditions for the bypass function are no longer being met, the ventilation air fan is switched back on.

The bypass function can be adjusted in the settings menu using parameters 05, 06 and 07.

Conditions

Bypass function active

The outside temperature is higher than 10°C and lower than the room temperature, and the room temperature is higher than the bypass temperature set in parameter 05.

Bypass function inactive

The outside temperature is lower than 10°C.

The outside temperature is at least 0.5°C higher than the room temperature.

The room temperature is lower than the bypass temperature reduced by the bypass hysteresis. The bypass temperature is set in parameter 05. The bypass hysteresis is set in parameter 06.

4. Settings

Note

User operations are restricted to switching the appliance ON and OFF. The basic settings are set by your qualiﬁed contractor when commissioning the appliance.

4.1 Remote control

Observe the operating and installation instructions for the relevant remote control (see chapter "Appliance description/ Required accessories" or "Appliance description / Other accessories").

4.2 User interface on the appliance

The appliance has a user interface with display. This enables air ﬂow rates to be variably adjusted or operating details to be checked.

D0000044898

1 2 3 4

5

1 Menu key 2 Minus key 3 LCD 4 Plus key 5 R key

You can access and change settings using the four keys (menu, plus, minus, R).

OPERATION

Settings

ENGLISH

www.stiebel-eltron.com LWZ70E | 5

When the mains power is switched on, all available symbols are displayed for two seconds. The backlight is also switched on for 60 seconds.

If one of the keys is pressed, the display is illuminated for 30 seconds.

If no keys are pressed and/or if no blocking fault occurs, standard mode is displayed.

When the menu key is pressed, you can use the plus or minus key to choose between three different sub-menus:

- Settings menu (SET)

- Read-out menu (READ)

- Service menu (SERV)

With the R key, you can exit any selected menu and return to standard mode.

To switch on the display backlight without changing anything in the menu, press the R key brieﬂy (less than 5 seconds).

Button Key function

Menu Open menu; open sub-menu; enable parameter for value change;

confirm value change

- Scroll; adjust value; switch appliance on or off from standard mode (press and hold down for 5 seconds)

+ Scroll; adjust value R One step back in the menu; reset adjusted value; filter reset (press

and hold down for 5 seconds); delete fault history

4.3 Switching the appliance on

26�04�15�0009

 Plug the appliance into a standard socket.

26�04�15�0011

All display symbols are shown for two seconds.

26�04�15�0029

The software version is displayed for two seconds.

D0000044916

The appliance then runs according to the stage switch setting. If no stage switch is connected, the appliance always runs in fan stage1.

Switching on via software

26�04�15�0032

If the appliance has been switched off via software, "OFF" is displayed.

5 s

26�04�15�0031

 Switch on the appliance by pressing the minusbutton for 5

seconds.

4.4 Switching off the appliance

Switching off via software

 Press and hold down the minus button for 5 seconds to

switch off the appliance.

The display shows "OFF".

5s

26�04�15�0048

Interrupting the power supply

26�04�15�0010

The display is now blank.

OPERATION

Settings

6 | LWZ70E www.stiebel-eltron.com

WARNING Electrocution Before working on the appliance, always isolate the appliance from the power supply by ﬁrst switching the appliance off via the software and then unplugging it from the mains.

4.5 Standard mode

In standard mode, the display shows up to four different pieces of information (operating modes and values) simultaneously.

D0000044913

1 Indication of the fan stage, indication of connected

appliances 2 Indication of the air ﬂow rate 3 Message text, e.g. ﬁlter status text, triggering of external

switching contact, etc. 4 Fault symbol

4.5.1 Fan stage

D0000044914

A fan symbol is displayed when the supply air fan and the extract air fan rotate. The fan symbol is not visible when the fans are at a standstill.

The number after the fan symbol indicates the fan stage.

Fan stage indicator

Description

The supply air and extract air fans generate an air flow rate of 50m³/h or stop. This depends on the setting of parameter 01. This fan stage cannot be enabled with a 3-stage switch. This fan stage prevents mould formation using the factory-set air flow rate of 50m³/h.

The supply air and extract air fans rotate according to stage1 of the stage switch. The air flow rate depends on the parameter 02 setting.

The supply air and extract air fans rotate according to stage 2 of the stage switch. The air flow rate depends on the parameter 03 setting.

The supply air and extract air fans rotate according to stage 3 of the stage switch. The air flow rate depends on the parameter 04 setting.

A number of appliances of this type have been connected. The supply air and extract air fans rotate according to the fan stage selected at the master appliance. If the appliance is connected in a cascade, the slave number of the appliance is displayed.

4.5.2 Indication of the air ﬂow rate

D0000044915

The selected air ﬂow rate of the supply air and extract air fans is displayed.

If the air ﬂow rates of the supply air and extract air fans differ, e.g. when an external switching contact is used, the highest air ﬂow rate is always displayed.

If you switch the appliance off using the programming unit, the text "OFF" appears.

4.5.3 Message texts in standard mode

D0000044921

At this point on the display, a message text may appear. The message text "FILTER" always takes priority over other message texts.

Message text Description

FILTER

If FILTE R is displayed, the filter must be cleaned or replaced.

V1 or V2

If V1 or V2 is displayed, one of the 0-10V inputs is enabled.

Only when using connection X1:

Message text Description

Slave 1, Slave 2, etc.

Master appliance:

Slave appliance:

With connected appliances, the message tex t indicates which appliance is the "Slave 1" to "Slave 9". The default display for fan operation is indicated on the master appliance.

OPERATION

Maintenance, cleaning and care

ENGLISH

www.stiebel-eltron.com LWZ70E | 7

5. Maintenance, cleaning and care

Maintenance by the user is limited to ﬁlter cleaning or replacement required at certain intervals.

5.1 Replacement ﬁlter

Produc t designation

Part number Description

FMSLWZ 70 222446 Filter mat G3;

10pce per packing unit

FMSF7-2 70 227660 Fine f ilter F7;

2pce per packing unit

5.2 Cleaning ﬁlters

Filters must be cleaned when "FILT ER" is displayed.

D0000044917

 Replace ﬁlters annually.

Never operate the appliance without ﬁlters.

Cleaning or replacing ﬁlters

> 5 s

D0000041945

 Press and hold down the minus button for 5 seconds to

switch off the appliance.

 Remove the ﬁlter ﬂaps.

D0000041946

1

2

1 Extract air ﬁlter 2 Supply air ﬁlter

 Extract the supply air and extract air ﬁlters. Make a note of

how the ﬁlters were ﬁtted.

26�04� 15�0015

 Clean the ﬁlters, e.g. with a vacuum cleaner.

D0000041947

 Push the cleaned or new ﬁlter into the appliance.

> 5 s

D0000041948

 Assemble the two ﬁlter ﬂaps.  Switch on the appliance by pressing the minusbutton for 5

seconds.

5s

1

2 3

D0000044937

 After cleaning or replacing the ﬁlters, hold down the R key

for 5 seconds to reset the ﬁlter display.

OPERATION

Troubleshooting

8 | LWZ70E www.stiebel-eltron.com

To conﬁrm that the ﬁlters have been reset, the text "FILT ER" will ﬂash brieﬂy. Even if the message "FILTER" has not yet been displayed, you can reset the ﬁlter message. The counter is then reset to zero.

Once the ﬁlter has been reset, the text "FILT ER" disappears and standard mode is displayed again.

6. Troubleshooting

6.1 Fault analysis

D0000044931

If the appliance detects a fault, a ﬂashing fault symbol (spanner) is displayed, possibly together with a fault code. The appliance differentiates between a fault, where the appliance continues to operate with limited functionality, and a blocking fault, where both fans are stopped. In the event of a blocking fault, the settings and

read-out menus are also switched off and access is restricted to the service menu.

The appliance remains in this fault condition until the problem has been resolved. The appliance then resets itself (auto reset) and standard mode is displayed again.

6.2 Fault code

Non-blocking fault

D0000044923

If the appliance detects a non-blocking fault code, it continues to operate with limited functionality. Non-blocking faults are displayed with the fault symbol (spanner).

Blocking fault

D0000036353

If the appliance detects a blocking fault code, it stops. The permanently illuminated display shows the fault symbol (spanner) together with a fault code.

 Notify a qualiﬁed contractor, who can correct the fault.

A blocking fault cannot be resolved by brieﬂy disconnecting the appliance from the power supply. The fault itself must ﬁrst be rectiﬁed.

If you cannot remedy the fault, notify your qualiﬁed contractor. To facilitate and speed up your request, provide the number from the type plate (000000-0000-000000). The type plate is located on the appliance cover.

ENGLISH

www.stiebel-eltron.com LWZ70E | 9

INSTALLATION

Safety

INSTALLATION

7. Safety

Only a qualiﬁed contractor should carry out installation, commissioning, maintenance and repair of the appliance.

7.1 General safety instructions

We guarantee trouble-free function and operational reliability only if original accessories and spare parts intended for the appliance are used.

7.2 Instructions, standards and regulations

Note

Observe all applicable national and regional regulations and instructions.

7.3 Operation of the appliance in buildings with combustion equipment

If the building contains combustion equipment (tiled stoves, ﬁreplaces, etc.), the responsible ﬂue gas inspector must be consulted in the planning phase. The ﬂue gas inspector assesses whether all statutory regulations are being observed. Here, a differentiation is made between balanced and open ﬂue combustion equipment.

For simultaneous operation of combustion equipment and a mechanical ventilation system, we recommend choosing approved room sealed combustion equipment (in Germany, DIBt approval).

7.3.1 Room sealed combustion equipment

In conjunction with room sealed combustion equipment, no additional precautions are generally required. Assessment is carried out by the ﬂue gas inspector.

7.3.2 Open ﬂue combustion equipment

!

WARNING INJURY If open ﬂue combustion equipment is operated with the mechanical ventilation system, tested safety equipment must be installed. The combustion equipment must also have a separate combustion air supply.

With open ﬂue combustion equipment, a differentiation must be made between alternate and simultaneous operation of the ventilation system and combustion equipment.

Alternate operation

Operation on alternate sides means that, when the combustion equipment is commissioned, the mechanical ventilation system is switched off and/or cannot be started.

Simultaneous operation

!

WARNING INJURY To prevent any ﬂue gas escaping into the installation room, it is necessary to ensure that sufﬁcient combustion air is supplied or that the negative pressure in room where the stove is installed is not greater than 4 Pa. Tested safety equipment must be installed to monitor the chimney draught (differential pressure monitoring) and to switch off the ventilation unit in the event of a fault.

Connect the safety equipment according to the chapter "Installation/ Electrical connection/ Connecting safety equipment for stove/ﬁreplace operation".

The equipment for differential pressure monitoring should fulﬁl the following requirements:

- Monitoring of the differential pressure between the connection piece to the chimney and the room where the combustion equipment is installed.

- Possibility of matching the shutdown value for the differential pressure to the minimum draught requirement for the combustion equipment.

- Floating contact to switch off ventilation.

- Optional connection of a temperature capturing device so that differential pressure monitoring is only enabled when the combustion equipment is in operation and so that unwanted shutdowns due to environmental inﬂuences can be avoided.

Note

Differential pressure switches that use the pressure differential between the outdoor air pressure and the pressure in the room where the combustion equipment is sited as a response criterion are not suitable.

The mechanical ventilation system is switched off when the safety equipment responds.

Note

The maximum available external pressure (see chapter "Speciﬁcation/ Data table") must not be exceeded.

10 | LWZ70E www.stiebel-eltron.com

INSTALLATION

Appliance description

8. Appliance description

8.1 Standard delivery

The following are delivered with the appliance:

- Wall mounting bracket set (2mounting brackets, 3protective caps, 1rubber strip, 2rubber rings, 1 set of installation instructions)

- PVC condensate drain (1x1.5” threaded plastic nut, 1 sealing ring, 1 PVC glued joint)

- Approx. 90 cm long cable for connecting a remote control

8.2 Required accessories

- Hardwired remote control used to control the air ﬂow rates preset in three stages. Our range of accessories includes remote control units with additional functions.

8.3 Further accessories

- Preheater coil

- You can obtain ventilation pipes, extract air and supply air valves and similar accessories from us.

9. Preparations

9.1 Installation site

The appliance can be mounted on the wall with the wall mounting bracket set supplied.

!

Material losses

For vibration-free mounting, a solid wall with a minimum mass of 200kg/m2 is required. A plaster board or metal framed wall is inadequate. Additional measures such as a double skin or additional supports would be needed in such cases.

Ensure the equipment is level after installation.

The installation site must have an adequate condensate drain with stench trap and a fall for the condensate.

The installation site must be free from the risk of frost.

Minimum clearances

≥300

D0000041883

9.2 Transport

To protect the appliance against damage, you should transport it to the installation room inside its original packaging.

10. Installation

10.1 Mounting the appliance

10 mm

26�04� 15�0078

 Undo the two top crosshead screws on the back of the

appliance.

 Secure one of the two rails to the appliance with screws.

!

Material losses

 Check whether the wall can bear the weight of the

appliance.

 Use appropriate rawl plugs and screws suitable for

the wall structure to attach the rail.

 Mount the second rail on the wall as a retainer. To avoid

sound transmission, place the washers supplied between the wall and the rail.

 Afﬁx the spacers supplied to the back of the appliance.

ENGLISH

www.stiebel-eltron.com LWZ70E | 11

INSTALLATION

Installation

26�04� 15�0079

 Place the rubber strips supplied on the rail mounted on the

wall. The rubber strip helps provide sound insulation.

 Fit the appliance so that the two rails interlock.

10.2 Connecting the condensate drain

!

Material losses

Never kink the hose, to ensure the condensate drains perfectly. The fall must be at least 10%. Ensure the device is level after installation.

> 60

D0000041960

The condensate drain is routed through the ﬂoor plate. The condensate must drain away via the domestic sewer system.

 Secure the condensate drain connector supplied along with

the gasket and union nut to the condensate drain located underneath the appliance.

You can ﬁt the condensate drain pipe (bent if required) to this condensate drain connector with a glued joint.

 Before connecting the condensate drain to the appliance,

pour water into the siphon to create a stench trap.

The condensate drain pipe must terminate below the water level in the siphon. The condensate drain pipe must be immersed in the water in the siphon by at least 60 mm.

10.3 Connecting air ducts

During installation, ensure that no metal swarf enters the ductwork. However, should this still occur, you must remove this material, otherwise the fans may be damaged.

External wall ducts

Supply outdoor air from a location where contamination (dust, soot, odours, ﬂue gas, exhaust air) is as low as possible.

When installing external wall ducts, prevent any short circuit between the air intake and the air discharge.

Silencers

Install a silencer in both the supply air and extract air ducts. We recommend installing additional silencers if required to avoid sound transmission.

If a room with a high noise level must be ventilated, install additional silencers upstream of this room to reduce sound transmission to adjacent rooms.

Aspects such as carried voices and impact sound must also be taken into consideration in the case of ducts embedded in concrete. Carried voices should be avoided by designing the duct with separate branches to the extract air and supply air valves. If required, insulate the supply air ducts, e.g. if they are outside the insulated wall panel.

Overﬂow apertures

In living rooms and bedrooms, air is only blown in. Air is only extracted from rooms where odours and moisture are generated. Ventilation grilles must be installed in internal doors or walls, or the air gap beneath the door must be increased to ≥ 8 mm to ensure an unobstructed air ﬂow.

Insulation against condensation

!

Material losses

When warm air meets cold surfaces, condensation can result.

 For outdoor air and exhaust air ducts, use va-

pour-proof thermally insulated pipes.

 If you use uninsulated pipes and moulded parts for

this pipework, ensure that they are adequately insulated.

 Insulate the supply air and extract air ducts if they

are routed through unheated rooms.

The extract air duct does not require a control valve, because the necessary air ﬂow rates are controlled by the appliance itself.

12 | LWZ70E www.stiebel-eltron.com

INSTALLATION

Commissioning

10.4 Power supply

WARNING Electrocution Carry out all electrical connection and installation work in accordance with national and regional regulations.

WARNING Electrocution Before connecting the appliance to the mains power supply, isolate all power cables. Isolation from the mains power supply must be carried out with a contact separation of at least 3 mm, e.g. by means of omnipolar isolators.

You can connect the appliance to a standard socket with the plug ﬁtted to the appliance.

1

2

D0000041968

1

2

3

4

5

1 Power cable 2 Two-pole screw connection (only suitable for low voltage) 3 Modular plug-in connection (RJ12, only suitable for low

voltage)

4 Service connection 5 Entry electrical cables

Connecting safety equipment for stove/ﬁreplace operation so that the safety equipment can interrupt the power supply

 Connect the safety equipment in accordance with the dia-

gram in chapter "Speciﬁcation/ Standard circuit".

11. Commissioning

11.1 Initial start-up

Setting the air ﬂow rate

Output and energy consumption of the appliance depend on the pressure drop in the duct system and the resistance of the ﬁlters.

Fan stage Air flow rate

m³/h

0

50: Moisture protection ventilation This fan stage prevents mould formation using the

factory-set air flow rate of 50m³/h.

m³/h must be lower than for stage 2

m³/h must be lower than for stage 3

m³/h 50 - 180

The air ﬂow rate of the higher fan stage is automatically selected if one of the above conditions is not met.

11.2 Shutdown

Even during longer periods away from home, we recommended that the equipment should be allowed, via the remote control, to run at switch position1. If you nevertheless need to take the appliance out of use for an extended period, switch it off via the user interface and unplug it from the mains to isolate it from the power supply.

 Clean or replace ﬁlters.

11.3 Recommissioning

 Check whether ﬁlters are ﬁtted in the appliance. Never start

the appliance without ﬁlters.

 Check whether the condensate drain is damaged or kinked.

ENGLISH

www.stiebel-eltron.com LWZ70E | 13

INSTALLATION

Settings

12. Settings

12.1 Settings menu

For optimum appliance function, you can change parameters used to adapt the appliance to the actual installation. Some parameter settings such as the air ﬂow rates have been set out in the technical details appertaining your individual building.

Note

Changes to settings not described may only be made by agreement with the manufacturer. Incorrect settings may impair the correct appliance function.

12.1.1 How to set parameters

 Press menu in standard mode.

The settings menu is displayed ("SET").

26�04�15�0064

Enabling the settings menu

 Press menu again to enable the settings menu.

D0000044922

Selecting parameters

 Use the plus or minus key to select the parameter you want

to set.

D0000044924

1 2

1 Parameter number 2 Parameter value

Parameter change

 Press menu.

D0000044926

 The parameter value starts to ﬂash.

D0000044929

 Use plus or minus to change the parameter value.

Discarding a parameter change

 If you do not want to save the amended parameter value,

press the R key.

D0000044927

Conﬁrm parameter value

D0000044928

 If you do want to save the amended parameter value, press

the R key.

Note

To change other parameters, repeat the steps described from "Selecting parameters". If you do not want to change any more parameters, press R. This brings you back to normal operating mode.

14 | LWZ70E www.stiebel-eltron.com

INSTALLATION

Settings

12.1.2 List of parameters in the settings menu

Parameter Description Unit Factory

sett ing

Setting range Step

size

Display text and symbols

01

Air flow rate of stage

m3/h 50 0

50: Moisture protection ventilation 02 Air flow rate of stage 1 m3/h 75 50- 180 5

03 Air flow rate of stage 2 m3/h 100 50 - 180 5

04 Air flow rate of stage 3 m3/h 150 50-180 5

05 Bypass temperature °C 22 15 - 35 0.5

BYPA SS

06 Bypass hysteresis °C 2 0 - 5 0.5

BY HYS

07 Bypass function 0 0 (Automatic function)

BYPA SS

1 (bypass function permanently inactive) 2 (bypass function permanently active) 08 BUS address 0 0 - 9 (0 = master) BUSADR 09 Introduction of an additional ex-

tract air flow.

OFF This parameter is not relevant for you. As default, this

parameter must remain OFF for this appliance.

CV+WTW

10 Pressure imbalance permissible ON OFF (Air flow rate for supply/extract air the same)

ON (Pressure imbalance permissible) 11 Fixed pressure imbalance m3/h 0 -50 - 50 1

12 Preheating coil connected OFF ON (Preheater coil connected)

OFF (No preheater coil) 13 - 29 no function 30 Humidity sensor OFF OFF (Humidity sensor switched off )

ON (Humidity sensor switched on) 31 Humidity sensor sensitivity 0 2 (sensitive) to -2 (least sensitive)

12.2 Read-out menu

With the read-out menu, you can call up some values for more detailed information on the function of the appliance. Values and settings cannot be changed in the read-out menu.

26�04�15�0064

 Press menu in standard mode.

The settings menu is displayed ("SET").

26�04� 15�0071

 Press plus or minus to switch to the read-out menu.

26�04� 15�0072

 Press Menu to enable the read-out menu.

26�04� 15�0073

1 2

 Use plus or minus in the read-out menu to move to the re-

quired parameter.

Read-out menu Descr ipt ion of the actual value Unit

01 Room temperature °C 02 Outside temperature (captured by the outside

temperature sensor)

o

C

03 Bypass status (ON = Bypass function active, OFF =

Bypass function not active)

04 Frost protection status (ON = Frost protection en-

abled, OFF = Frost protection disabled)

ENGLISH

www.stiebel-eltron.com LWZ70E | 15

INSTALLATION

Settings

2 x

D0000044932

 Press R twice to return to standard mode.

If no key is pressed for 5 minutes, the appliance returns automatically to standard mode.

12.3 Service menu

In the service menu, you can view the last 10 fault messages.

In the case of blocking faults, the settings menu and the read-out menu are blocked and only the service menu can be accessed. Pressing menu opens the service menu.

Viewing the service menu

26�04�15�0064

 Press menu in standard mode. The settings menu is

displayed.

26�04�15�0057

 Press plus or minus to switch to the read-out menu.

26�04�15�0058

1

2

1 Fault message number 2 Fault code

 Press the menu button to enable the service menu.

You can use plus and minus to scroll through the read-out menu.

Indication "No fault message"

26�04�15�0056

Current fault message (fault symbol on the display)

For fault messages with a cause that has not yet been eliminated, the fault symbol (spanner) appears.

26�04� 15�0075

Resolved fault message (no fault symbol on the display)

For fault messages with a caused that has been eliminated, the fault symbol (spanner) does not appear.

26�04� 15�0076

Back to standard mode

2 x

D0000044932

 Press R twice to return to standard mode.

Deleting fault messages

You can delete all fault messages by holding down R for ﬁve seconds. This is only possible if there are no active faults.

16 | LWZ70E www.stiebel-eltron.com

INSTALLATION

Maintenance

12.4 Restoring factory settings

It is possible to reset all changed settings simultaneously to factory settings.

All changed settings revert back to their factory default settings; all message/fault codes are also deleted from the service menu.

D0000044930

 Press plus and minus simultaneously and hold down for 10

seconds.

All display symbols light up for three seconds. The appliance is then in standard mode.

13. Maintenance

WARNING Electrocution In the event of damage to the power cable this must always be replaced by a qualiﬁed contractor authorised by the manufacturer, using original spare parts.

Maintenance by the qualiﬁed contractor includes the cleaning of the cross-countercurrent heat exchanger and the fans.

Subject to runtime, this maintenance work should be carried out every 3 years.

 Switch off the appliance by pressing the minus key for

5seconds.

 Disconnect the power supply.  Remove the ﬁlter ﬂaps.  Extract the ﬁlters. Make a note of how the ﬁlters were ﬁtted.

2x

D0000041949

 Remove the front cover.

D0000041950

 Remove the display.

D0000041951

 Pull the insert on which the control PCB is ﬁtted out of the

appliance.

 Disconnect all plugs on the control PCB that are connected to

plug-in connections at the top of the appliance.

 Remove the earth wire from the appliance body.

D0000041952

 Remove the heat exchanger from the appliance. Avoid dam-

aging the foam parts in the appliance.

ENGLISH

www.stiebel-eltron.com LWZ70E | 17

INSTALLATION

Maintenance

26�04�15�0047

 Use a commercially available vacuum cleaner to remove dust

and other loose dirt particles from the intake and discharge surfaces.

 If required, clean the heat exchanger with warm water

(max.55 °C) and a commercially available detergent. Never use solvents.

 Afterwards ﬂush the heat exchanger with water.

D0000041953

 Extract the fan unit from the appliance.

D0000041954

 Remove the fans.  Clean the fans with a soft brush.  Do not move the pressure compensation weights.  Reinstall the fans.  Push the complete fan unit back into the appliance.

 Reconnect the fan cables to the PCB. Observe the label in

the appliance to establish the correct position for the plug-in connections.

 Slide the insert with the control PCB into the appliance.  Install the display.  Reconnect all cables disconnected before cleaning, to their

original position.

 Slide the heat exchanger back into the appliance.  Fit the front cover.  Insert the ﬁlters, respectively with their clean sides facing

towards the heat exchanger.

 Assemble the ﬁlter ﬂaps.  Switch on the power supply.  Switch on the appliance using the user interface by holding

down minus for 5 seconds.

 After cleaning the ﬁlter or installing a new ﬁlter, reset the ﬁl-

ter status indicator by holding down R for 5 seconds.

Cleaning the air ducts

Air ducts should be checked and possibly cleaned at regular intervals. Releasing the air ducts from the appliance or over the extract air and supply air valves enables inspection and cleaning.

18 | LWZ70E www.stiebel-eltron.com

INSTALLATION

Troubleshooting

14. Troubleshooting

Fault code

Blocking

fault

Cause

Appliance b ehaviour

Measure

E104

Yes

The extract air fan is faulty.

Both fans are switched off. The preheating coil, if present, is switched off. Restarting occurs ever y 5 minutes.

Isolate the appliance from the power supply. Replace the extract air fan. Switch on the power supply to the appliance again. The fault is reset automatically. Check the cabling.

E105

Yes

The supply air fan is faulty.

Both fans are switched off. The preheating coil, if present, is switched off. The reheater coil, if present, is switched off. Restar ting occurs every 5 minutes.

Isolate the appliance from the power supply. Replace the supply air fan. Switch on the power supply to the appliance again. The fault is reset automatically. Check the cabling.

E106

Yes

The temperature sensor for capturing the outside temperature is faulty.

Both fans are switched off. The preheating coil, if present, is switched off.

Isolate the appliance from the power supply. Replace the outside temperature sensor. Switch on the power supply to the appliance again. The fault is reset automatically.

E107

no

The temperature sensor for capturing the extract air temperature is faulty.

The bypass function is switched off.

Isolate the appliance from the power supply. Replace the room temperature sensor.

E108

no

If installed: The temperature sensor in the external reheater coil is fault y.

The reheater coil, if present, is switched off. The geothermal heat exchanger, if present, is switched off.

Replace the temperature sensor for the outside temperature.

E111

no

The humidity sensor is faulty.

The appliance is still operating.

Isolate the appliance from the power supply. Replace the humidity sensor.

E999

Yes

The microswitches on the control PCB are not set correctly.

The appliance does not operate; the red fault LEDs at the stage switch are also off.

Adjust the microswitches correctly.

Correct microswitch setting

X6

X4

X3

ON

D

D0000041967

 Check whether the microswitches on the control PCB are

set correctly (see diagram). If message E999 is nevertheless displayed, replace the control PCB with a PCB of the correct type.

Stage switch modular connector

If stage2 on a stage switch does not work, the modular connector of the stage switch is not connected correctly.

 Disconnect one of the RJ plug-in connections to the stage

switch. Fit a new plug-in connection in the opposite direction.

ENGLISH

www.stiebel-eltron.com LWZ70E | 19

INSTALLATION

Specication

15. Speciﬁcation

15.1 Dimensions and connections

125168

248

600

45

145

560

79

75

213

77

213

302

g03

g04 g05

g06

d45

b01

D0000041882

LWZ70E

b01 Entry electrical

cables d45 Condensate drain Diameter mm 13 g03 Outdoor air

Nominal diameter

DN 125

g04 Exhaust air

Nominal diameter

DN 125

g05 Extract air

Nominal diameter

DN 125

g06 inrushing air

Nominal diameter

DN 125

20 | LWZ70E www.stiebel-eltron.com

INSTALLATION

Specication

15.2 Standard circuit

L N PE

1/N/PE 230V ~50Hz

Lüftungsgerät

6 x 0,5 mm² max. 30 m

Schalter

Kaminbetrieb

Ofen

Raum

Druckanschluss

Differenzdruckcontroller für Feuerstätten

X2

ZLWZ 4S

24 V

P (0V)0 2 3LED

24 V

P (0V)0 2 3LED

FEZ

24 V

P (0V)0 23 LED

12104 115

FEQ

24 V

P (0V)02 3LED

64

251

3-Stufen-Schalter

24 V

P (0V)0 23 LED

3

2

1

D0000055737

3-Stufen-Schalter 3-stage switch ZLWZ 4S 4-stage switch FEQ Air quality sensor FEZ Remote control Lüftungsgerät Ventilation unit Ofen Stove Raum Room Druckanschluss Pressure connection Schalter Kaminbetrieb Switch, fireplace operation Differenzdruckcontroller

für Feuerstätten

Differential pressure controller for combustion equipment

ENGLISH

www.stiebel-eltron.com LWZ70E | 21

INSTALLATION

Specication

15.3 Wiring diagram

1 2

1 2 1 21 2

3

2

1

A

C

B

D

E

K

M

BN

WH

WHBNWH

D0000041966

A 3-stage switch, 4-stage switch, air quality sensor FEQ or

remote control FEZ (see chapter "Speciﬁcation/ Standard

circuit") B External preheating coil (optional) C Outside temperature sensor D Room temperature sensor E Service connection K Wire no. 1 M Wire no. 2

22 | LWZ70E www.stiebel-eltron.com

INSTALLATION

Specication

15.4 Fan diagram

0

50

100

150

200

250

300

350

400

450

500

550

0 25 50 75 100 125 150 175 200

1

2

3

4

0,59

0,51

0,40

0,62

0,43

0,46

0,32

0,27

0,49

0,28

0,37

0,32

0,29

0,37

0,45

0,34

0,53

0,40

0,28

0,26

D0000056686

X Air ﬂow rate [m³/h] Y Average value, static pressure [Pa] 1 Example: system curve with low pressure drop 2 Example: system curve with average pressure drop 3 Example: system curve with higher pressure drop

x

Speciﬁc power consumption of both fans [Wh/m³]

ENGLISH

www.stiebel-eltron.com LWZ70E | 23

INSTALLATION | GUARANTEE | ENVIRONMENT AND RECYCLING

Specication

15.5 Data table

LWZ70E

233851 Sound data Sound power level (EN 12102) dB(A) 46 Energy data Energy efficiency class A Electrical data Rated voltage V 230 Max. current drawn A 1.48 Power consumption without preheater coil A 1.48 Phases 1/N/PE Frequency Hz 50 Power consumption W 13-112 Power consumption without preheater coil W 136 Versions IP rating IP30 Filter class G3 Dimensions Height mm 600 Width mm 560 Depth mm 290 Weights Weight kg 25 Connections Air connector diameter mm 125 Condensate connection mm 13 Values Air flow rate m³/h 50 -180 Heat recovery level up to % 90 Extract air application range °C 15 - 30 Max. ambient temperature °C 60 Available external pressure, ventilation Pa 160

Guarantee

The guarantee conditions of our German companies do not apply to appliances acquired outside of Germany. In countries where our subsidiaries sell our products a guarantee can only be issued by those subsidiaries. Such guarantee is only granted if the subsidiary has issued its own terms of guarantee. No other guarantee will be granted.

We shall not provide any guarantee for appliances acquired in countries where we have no subsidiary to sell our products. This will not aect warranties issued by any importers.

Environment and recycling

We would ask you to help protect the environment. After use, dispose of the various materials in accordance with national regulations.



Deutschland

STIEBEL ELTRON GmbH & Co. KG Dr.-Stiebel-Straße 33 | 37603 Holzminden Tel. 05531 702-0 | Fax 05531 702-480 info@stiebel-eltron.de www.stiebel-eltron.de

Verkauf Tel. 05531 702-110 | Fax 05531 702-95108 | info-center@stiebel-eltron.de Kundendienst Tel. 05531 702-111 | Fax 05531 702-95890 | kundendienst@stiebel-eltron.de Ersatzteilverkauf Tel. 05531 702-120 | Fax 05531 702-95335 | ersatzteile@stiebel-eltron.de

Irrtum und technische Änderungen vorbehalten! | Subject to errors and technical changes! | Sous réserve d‘erreurs et de modifications techniques! | Onder voorbehoud van ver

g

issingen en technische wijzigingen! |

Salvo error o modificación técnica! | Excepto erro ou alteração técnica | Zastrzeżone zmian

y

techniczne i ewentualne błędy | Omyly a technické změny jsou vyhrazeny! | A muszaki változtatások és tévedések jogát fenntartjuk! |

Отсутствие ошибок не гарантируется. Возможны технические изменения.

| Chyby a

technické zmeny sú vyhradené! Stand 9046

Australia

STIEBEL ELTRON Australia Pty. Ltd. 6 Prohasky Street | Port Melbourne VIC 3207 Tel. 03 9645-1833 | Fax 03 9645-4366 info@stiebel.com.au www.stiebel.com.au

Austria

STIEBEL ELTRON Ges.m.b.H. Eferdinger Str. 73 | 4600 Wels Tel. 07242 47367-0 | Fax 07242 47367-42 info@stiebel-eltron.at www.stiebel-eltron.at

Belgium

STIEBEL ELTRON bvba/sprl 't Hofveld 6 - D1 | 1702 Groot-Bijgaarden Tel. 02 42322-22 | Fax 02 42322-12 info@stiebel-eltron.be www.stiebel-eltron.be

China

STIEBEL ELTRON (Guangzhou) Electric Appliance Co., Ltd. Rm 102, F1, Yingbin-Yihao Mansion, No. 1 Yingbin Road Panyu District | 511431 Guangzhou Tel. 020 39162209 | Fax 020 39162203 info@stiebeleltron.cn www.stiebeleltron.cn

Czech Republic

STIEBEL ELTRON spol. s r.o. K Hájům 946 | 155 00 Praha 5 - Stodůlky Tel. 251116-111 | Fax 235512-122 info@stiebel-eltron.cz www.stiebel-eltron.cz

Finland

STIEBEL ELTRON OY Kapinakuja 1 | 04600 Mäntsälä Tel. 020 720-9988 info@stiebel-eltron.fi www.stiebel-eltron.fi

France

STIEBEL ELTRON SAS 7-9, rue des Selliers B.P 85107 | 57073 Metz-Cédex 3 Tel. 0387 7438-88 | Fax 0387 7468-26 info@stiebel-eltron.fr www.stiebel-eltron.fr

Hungary

STIEBEL ELTRON Kft. Gyár u. 2 | 2040 Budaörs Tel. 01 250-6055 | Fax 01 368-8097 info@stiebel-eltron.hu www.stiebel-eltron.hu

Japan

NIHON STIEBEL Co. Ltd. Kowa Kawasaki Nishiguchi Building 8F 66-2 Horikawa-Cho Saiwai-Ku | 212-0013 Kawasaki Tel. 044 540-3200 | Fax 044 540-3210 info@nihonstiebel.co.jp www.nihonstiebel.co.jp

Netherlands

STIEBEL ELTRON Nederland B.V. Daviottenweg 36 | 5222 BH 's-Hertogenbosch Tel. 073 623-0000 | Fax 073 623-1141 info@stiebel-eltron.nl www.stiebel-eltron.nl

Poland

STIEBEL ELTRON Polska Sp. z O.O. ul. Działkowa 2 | 02-234 Warszawa Tel. 022 60920-30 | Fax 022 60920-29 biuro@stiebel-eltron.pl www.stiebel-eltron.pl

Russia

STIEBEL ELTRON LLC RUSSIA Urzhumskaya street 4, building 2 | 129343 Moscow Tel. 0495 7753889 | Fax 0495 7753887 info@stiebel-eltron.ru www.stiebel-eltron.ru

Slovakia

TATRAMAT - ohrievače vody s.r.o. Hlavná 1 | 058 01 Poprad Tel. 052 7127-125 | Fax 052 7127-148 info@stiebel-eltron.sk www.stiebel-eltron.sk

Switzerland

STIEBEL ELTRON AG Industrie West Gass 8 | 5242 Lupfig Tel. 056 4640-500 | Fax 056 4640-501 info@stiebel-eltron.ch www.stiebel-eltron.ch

Thailand

STIEBEL ELTRON Asia Ltd. 469 Moo 2 Tambol Klong-Jik Amphur Bangpa-In | 13160 Ayutthaya Tel. 035 220088 | Fax 035 221188 info@stiebeleltronasia.com www.stiebeleltronasia.com

United Kingdom and Ireland

STIEBEL ELTRON UK Ltd. Unit 12 Stadium Court Stadium Road | CH62 3RP Bromborough Tel. 0151 346-2300 | Fax 0151 334-2913 info@stiebel-eltron.co.uk www.stiebel-eltron.co.uk

United States of America

STIEBEL ELTRON, Inc. 17 West Street | 01088 West Hatfield MA Tel. 0413 247-3380 | Fax 0413 247-3369 info@stiebel-eltron-usa.com www.stiebel-eltron-usa.com

A 319235-39280-9133

B 314250-39280-9133

4<AMHCMO=bjcdfa>