STIEBEL ELTRON Engineering and | Ventilation Technical Guide

01 | 0 1

Engineeringandinstallation2017|STIEBELELTRON

DHW Renewables Air conditioning Roomheating

Engineering and installation

Ventilation

2017

D0000074075 -a

STIEBEL ELTRON GmbH & Co. KG | Dr.-Stiebel-Strasse 33

37603 Holzminden | www.stiebel-eltron.de

CONTACT ______________________________________________________

TELEPHONE __________________________________________________________

FAX _____________________________________________________________________

YOUR CUSTOMER NUMBER ________________________________________

(IF APPLICABLE)

DATANORMDOWNLOADFROMTHEINTERNET.

On our website www.stiebel-eltron.de

you will find our standard "DATANORM" forms (ver-

sion 4.0) in section "Fachpartner-Bereich" under the

heading "Produktdaten" as a service for our trade

partners.

FAXREQUEST

Please send us the

DATANORM data set by email:

STIEBEL ELTRON GmbH & Co. KG

Datenservice, Martin Schultze

Dr.-Stiebel-Strasse 33

D-37603 Holzminden

Tel. 05531 702-95139

Fax +49 (0)5531 702-95108

DATANORM 4.0

To work with the tender documentation,

you require a text program capable of handling

DATANORM.

COMPANY ADDRESS (STAMP):

Engineering and installation

Reprinting or duplication, even partially, is only allowed with our express permission.

STIEBEL ELTRON GmbH & Co. KG, 37603 Holzminden

Legal note

Although we have tried to make this technical guide as accurate as possible, we are not liable for any inaccuracies in

its content. Information concerning equipment levels and speciﬁ cations are subject to modiﬁ cation. The equipment

features described in this technical guide are non-binding regarding the speciﬁ cation of the ﬁ nal product. Due to our

policy of continually improving our products, some features may have subsequently been changed or even removed.

Please consult your local dealer for information about the very latest equipment features. The images in this technical

guide are for reference only. The illustrations also contain installation components, accessories and special equipment

that do not form part of the standard delivery.

Speciﬁ cation

Dimensions in the diagrams are in millimetres unless stated otherwise. Pressure ﬁ gures may be stated in pascals (MPa,

hPa, kPa) or in bars (bar, mbar). The details of threaded connections are given in accordance with ISO228. Fuse types

and sizes are stated in accordance with VDE. Output details apply to new appliances with clean heat exchangers.

www.stiebel-eltron.com Ventilationtechnicalguide| 3

CONTACT ______________________________________________________

TELEPHONE __________________________________________________________

FAX _____________________________________________________________________

YOUR CUSTOMER NUMBER ________________________________________

(IF APPLICABLE)

DATANORMDOWNLOADFROMTHEINTERNET.

On our website www.stiebel-eltron.de

you will find our standard "DATANORM" forms (ver-

sion 4.0) in section "Fachpartner-Bereich" under the

heading "Produktdaten" as a service for our trade

partners.

FAXREQUEST

Please send us the

DATANORM data set by email:

STIEBEL ELTRON GmbH & Co. KG

Datenservice, Martin Schultze

Dr.-Stiebel-Strasse 33

D-37603 Holzminden

Tel. 05531 702-95139

Fax +49 (0)5531 702-95108

DATANORM 4.0

To work with the tender documentation,

you require a text program capable of handling

DATANORM.

COMPANY ADDRESS (STAMP):

Engineering and installation

Reprinting or duplication, even partially, is only allowed with our express permission.

STIEBEL ELTRON GmbH & Co. KG, 37603 Holzminden

Legal note

Although we have tried to make this technical guide as accurate as possible, we are not liable for any inaccuracies in

its content. Information concerning equipment levels and speciﬁ cations are subject to modiﬁ cation. The equipment

features described in this technical guide are non-binding regarding the speciﬁ cation of the ﬁ nal product. Due to our

policy of continually improving our products, some features may have subsequently been changed or even removed.

Please consult your local dealer for information about the very latest equipment features. The images in this technical

guide are for reference only. The illustrations also contain installation components, accessories and special equipment

that do not form part of the standard delivery.

Speciﬁ cation

Dimensions in the diagrams are in millimetres unless stated otherwise. Pressure ﬁ gures may be stated in pascals (MPa,

hPa, kPa) or in bars (bar, mbar). The details of threaded connections are given in accordance with ISO228. Fuse types

and sizes are stated in accordance with VDE. Output details apply to new appliances with clean heat exchangers.

4 |Ventilationtechnicalguide www.stiebel-eltron.com

Introduction ________________________________________________________ 6

STIEBEL ELTRON is full of energy! ____________________________________________________6

Design _______________________________________________________________ 8

Ventilation _________________________________________________________________________________ 8

Basics _______________________________________________________________________________________9

Ventilation concept ____________________________________________________________________ 10

Combining further building service functions ___________________________________ 11

Basics _____________________________________________________________________________________ 12

Air ﬂow rate calculation ______________________________________________________________ 15

Air distribution systems ______________________________________________________________ 19

LVE ﬂexible air distribution system ________________________________________________ 20

LVS ﬂexible air distribution system ________________________________________________ 33

LFK ﬂat duct system ___________________________________________________________________ 50

LWF folded spiral-seam tube system ______________________________________________ 54

Air outlets _______________________________________________________________________________ 56

Sound _____________________________________________________________________________________ 59

Cross-talk ________________________________________________________________________________ 61

Fire safety _______________________________________________________________________________ 62

Combustion equipment operation _________________________________________________ 63

Units and functions _______________________________________________ 63

Ventilation ________________________________________________________________________________64

Central supply and extract air ______________________________________________________ 64

Ventilation and DHW heating __________________________________________________________65

Extract air _______________________________________________________________________________ 65

Ventilation, DHW heating and heating ________________________________________________66

Central supply and extract air ______________________________________________________ 66

Ventilation ________________________________________________________________________________67

Decentralised supply and extract air ______________________________________________ 67

DHW heating and heating ______________________________________________________________68

Combination with decentralised ventilation _____________________________________ 68

Standardised ventilation _____________________________________________________________ 70

Ventilation units ___________________________________________________ 73

Product overview ________________________________________________________________________74

Central air routing _____________________________________________________________________ 74

Decentralised air routing ____________________________________________________________ 75

Ventilation with central supply air, extract air and heat recovery _______________76

LWZ 70 E _________________________________________________________________________________ 76

LWZ 180/280 ____________________________________________________________________________ 84

LWZ 170 E/370 plus ____________________________________________________________________ 92

LWZ 70-280 accessories _____________________________________________________________100

LWZ 100 plus LI/RE ___________________________________________________________________106

LWZ 100 plus LI/RE accessories ____________________________________________________113

Ventilation with decentralised supply air, extract air and heat recovery ______117

Design information for mixed ventilation systems ____________________________ 117

LWE 40___________________________________________________________________________________118

LWE 40 accessories ___________________________________________________________________124

LA 30 WRG ______________________________________________________________________________ 130

LA 30 WRG accessories ______________________________________________________________133

LA 50 _____________________________________________________________________________________ 136

LA 50 accessories _____________________________________________________________________140

LA 60 _____________________________________________________________________________________142

LA 60 accessories ____________________________________________________________________148

Design example 1 _____________________________________________________________________150

Design example 2 _____________________________________________________________________ 152

Design example 3 _____________________________________________________________________154

Design example 4 _____________________________________________________________________156

LWM 250 ________________________________________________________________________________158

LWM 250 accessories _________________________________________________________________ 165

LWA 100 _________________________________________________________________________________168

LWA 100 accessories _________________________________________________________________ 176

LWA 252 _________________________________________________________________________________ 178

LWA 252 accessories _________________________________________________________________187

Tableofcontents

Ventilationtechnicalguide

www.stiebel-eltron.com Ventilationtechnicalguide| 5

Integral units _____________________________________________________191

Product overview ______________________________________________________________________ 193

Central air routing ____________________________________________________________________ 193

Design ___________________________________________________________________________________ 194

Integral units with central supply air ____________________________________________194

Ventilation, DHW heating and heating ______________________________________________ 202

LWZ 304/404 Trend ___________________________________________________________________202

LWZ 304/404 ﬂex ______________________________________________________________________ 216

Ventilation, DHW heating, heating and cooling ___________________________________ 232

LWZ 304/404 SOL ______________________________________________________________________232

Integral unit with inverter _____________________________________________________________247

LWZ 504 _________________________________________________________________________________248

Integral unit accessories ______________________________________________________________ 263

Integral unit sets _______________________________________________________________________ 269

Solar sets _______________________________________________________________________________269

Integral unit without ventilation ____________________________________________________ 271

LWZ smart ______________________________________________________________________________272

LWZ smart accessories ______________________________________________________________285

Accessories _______________________________________________________294

LVE ﬂexible air distribution system _______________________________________________295

LVS ﬂexible air distribution system _______________________________________________302

LFK ﬂexible air distribution system _______________________________________________ 308

LWF folded spiral-seam tube system _____________________________________________ 320

Additional accessories _______________________________________________________________ 335

Appendix _________________________________________________________338

Appendix________________________________________________________________________________ 338

Terminology and descriptions _____________________________________________________338

Summary of formulae________________________________________________________________340

Key to the standard circuits_________________________________________________________341

Tableofcontents

Ventilationtechnicalguide

6 |Ventilationtechnicalguide www.stiebel-eltron.com

STIEBEL ELTRON is a group of companies with a decidedly interna-

tional outlook, and can rightly claim to be a global market leading

supplier of technology for building services and renewable energy

equipment. For more than 90 years, the company's success has

depended upon its level of technical competence, high quality

standards, innovation, reliability and customer-oriented service.

Five national and international production facilities, 24 subsidiar-

ies around the world, plus sales organisations and representatives

in 120countries translate into a truly global presence for STIE-

BELELTRON. Approximately 40percent of the company's turnover

comes from export.

We take ideas and turn them into innovations that move markets.

As a company driven by engineering expertise, we aim to deliv-

er results and turn our excellent products into groundbreaking

system solutions – because we want to be actively engaged in

shaping the future.

Our products have long been distinguished by excellent reliability,

high quality and a long service life. We have been developing

highly efﬁcient electrical appliances since 1924, and in our busi-

ness, we rely on our 3000employees and their expertise at every

stage of development – from the initial design right through to

the manufacture of the ﬁnal product.

The result is a portfolio of over 2000 products in the ﬁelds of DHW,

renewables, air conditioning and room heating. Thanks to smart

combinations, we are able to offer more than 30.000 system solu-

tions that can help you equip your home for the future.

Since 2015 at our head ofﬁce in Holzminden, we have been run-

ning the Energy Campus – a ﬂagship project for sustainable con-

struction that makes careful use of resources. This training and

communication centre brings together high quality architecture

and communication technology, and as a Plus Energy building, it

generates more energy than it consumes.

This is in keeping with our brand promise "Full of energy" and

creates a space where the spirit of STIEBEL ELTRON can be expe-

rienced both in theory and practice.

Introduction

STIEBELELTRONisfullofenergy!

www.stiebel-eltron.com Ventilationtechnicalguide| 7

Electricity – the energy source of the

future

Renewable energies will become the norm for our energy sup-

ply. More and more people recognise the beneﬁts of green and

self-generated power from renewable sources. The goal of the

energy transition is independence from fossil fuels.

Fossil fuels are in decline on the electricity market. Nowadays,

alternative energies from the sun, wind and water are being used

to generate power. This means electricity will remain our primary

energy source well into the future. So there is plenty of scope for

implementing the energy transition in your own home.

With the extrapolation of the energy saving ordinance (EnEV), the

energy requirements for residential and non-residential buildings

are increasing steadily. Reduction of the annual heat demand is

essentially achieved by decreasing transmission heat loss through

the building envelope. The proportion of ventilation heat loss in

the total heat demand is therefore constantly increasing and cor-

responds approximately to that of the transmission heat demand

of the building.

As one of the most important manufacturers of products in the

heating, ventilation, air conditioning and domestic hot water

equipment sector, we feel a great level of responsibility towards

our environment.

We have invested much time and care in the development of ven-

tilation units and integral ventilation systems. This has evolved

into a reliable technology that guarantees maximum convenience.

The reasons

When people breathe, cook and shower, they release carbon di-

oxide, odours, heat and water vapour into the indoor air. For

example, up to 8kg of water per day is released into the indoor

air by an average family of three.

A speciﬁed replacement of indoor air with fresh outdoor air is re-

quired in order to maintain indoor air quality, as well as to ensure

the extraction of humidity. Opening windows is not suitable for

this purpose and puts paid to a high heating energy saving poten-

tial. Only a controlled ventilation system can noticeably decrease

the ventilation heat demand without the risk of humidity damage.

Today, our system allows a very wide range of heating tasks to be

fulﬁlled conveniently and economically.

The right combination

As well as controlled mechanical ventilation, our systems can fulﬁl

further demands, e.g. ensuring room heating and DHW heating.

In our integral units, we have therefore combined the necessary

ventilation, heat pump and domestic hot water technology.

The accessories

Our accessories, from a simple pipe bend to a user friendly control

system with internet connection, are specially designed for our

ventilation systems and fulﬁl the highest quality requirements.

On the one hand, matching assemblies and individual parts guar-

antee straightforward and particularly fast, inexpensive installa-

tion. On the other, all our accessories are matched to each other

and to our ventilation units, thereby contributing to ﬂawless func-

tioning of the entire system.

Our range of ventilation units

—Efﬁcient, reliable and highly integrated ventilation systems

—Units that meet the highest aesthetic aspirations of today

—Ventilation units for new build and renovation projects

—Networked systems with internet connection and remote

maintenance

—Effective use of economy tariffs and solar power generated on

site

Introduction

STIEBELELTRONisfullofenergy!

8 |Ventilationtechnicalguide www.stiebel-eltron.com

Standards and speciﬁcations

The standards and speciﬁcations listed here illustrate the legal

basis within the Federal Republic of Germany at the time of print-

ing. This list may not be complete or applicable. Outside Germany,

observe all regulations and guidelines/directives that may apply

to your country.

Ventilation

DIN 18017-3

Ventilation of bathrooms and WCs without outside windows –

Ventilation by fans.

DIN 1946-6

Ventilation and air conditioning – Ventilation for residential build-

ings.

DIN 4719

Ventilation and air conditioning – Requirements, performance

testing and labelling

EN 779

Particulate air ﬁlters for general ventilation – Requirements, in-

spection, labelling.

EN 13141

Ventilation for buildings – Performance testing of components/

products for residential ventilation

EN 12102

Measurement of airborne noise – Determination of the sound

power level

VDI 3801

Operation of air conditioning equipment.

Safety and convenience

DIN 4109

Sound insulation in buildings – requirements and proof.

DIN VDE 0100

Erection of power installations with nominal voltages up to 1000V.

TA Lärm 98

Technical instructions to protect against noise emissions.

VBG 20

Refrigeration systems.

VDI 2087

Operating and construction fundamentals – Sound insulation,

temperature drop, heat loss for air ducts.

Energy and environment

EEWärmeG

Renewables Energies Heat Act.

EnEV

Regulations for energy saving thermal protection and energy sav-

ing system technology in buildings.

EN 12831

Heating systems in buildings – Method for calculation of the design

heat load.

DIN V 4108-6

Thermal protection and energy saving in buildings – Calculation of

the annual heat demand and annual heating energy requirements.

DIN 4108-7

Thermal protection and energy saving in buildings – Part 7: Air-

tightness of buildings, requirements, design/engineering and

implementation recommendations.

DIN V 4701-10

Energy efﬁciency of heating and ventilation systems in buildings,

Part 10: Heating, DHW heating, ventilation.

DIN V 18599

Energy efﬁciency of buildings – Net, end and primary energy de-

mand calculation for heating, cooling, ventilation, domestic hot

water and illumination

Further speciﬁcations

Individual state building regulations.

Note

Observe all applicable national and regional regulations

and instructions.

Standardised output data

Information on determining and interpreting the speciﬁed stand-

ardised output data:

The output data mentioned in text, diagrams, graphs and technical

datasheets in particular has been calculated according to the test

conditions speciﬁed in the norm shown in the data table of the

individual unit. 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 ex-

tent to which this method deviates from the conditions deﬁned in

the norm shown, any deviations can have a considerable impact.

Additional 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. Conﬁrmation of the speciﬁed output

data can only be obtained if the test conducted for this purpose

is also performed in accordance with the conditions speciﬁed in

the norm shown.

Design

Ventilation

www.stiebel-eltron.com Ventilationtechnicalguide| 9

Basics

In order to correctly design a ventilation system, many different

factors must be considered, observed and engineered appropri-

ately.

The pipework system, comprising supply and extract air vents,

distributor boxes, silencers with mounting and ﬁxing components,

plays a major role in this respect.

Further important aspects to be taken into account during design/

engineering are sound and hygiene standards for ventilation sys-

tems, for example.

Knowing about these correlations as well as how to implement the

system is essential for engineering a functional and convenient

mechanical ventilation system.

Design/engineering service

We would be happy to support you in designing your ventilation

system.

We offer a technical guide comprising: Air ﬂow rate calculation,

sizing of the air distribution system, adjustment of air ﬂow rates,

two and three dimensional illustrations and list of materials.

In order to design your system we require all relevant information

concerning the building, your intentions as well as preferences

and requirements for usage. Please use our engineering ques-

tionnaire for ventilation systems.

Our "Ventilation Navigator" is excellent for fast engineering. Please

visit our trade partner internet portal.

System design step by step

Determine requirements

Draw up ventilation concept to

DIN1946-6

Calculate heat load to EN12831

Calculate DHW demand

Design solar thermal system

Determine unit, unit version and system solution

Specify unit installation

Air ﬂow rate calculation for supply and extract air

Determine type, number and posi-

tion of the vents and overﬂow areas

Determine pipework system,

cross-sections and routing

Specify vent settings and ﬂow rates

Draw up a list of materials

Design

Basics

10 |Ventilationtechnicalguide www.stiebel-eltron.com

Ventilation concept

For ventilating rooms in residential units, we offer free or fan-as-

sisted systems.

The choice of system is determined by general as well as specif-

ic individual requirements. Whereas general requirements are

guidelines as given in e.g. regulations and directives and must

be complied with for all ventilation systems, speciﬁc individual

requirements are relevant to a particular residential unit.

General requirements pertaining to the building which must be

met include:

—Fire and sound insulation requirements

—Requirements relating to the use of living and common spaces

(comfort)

—Air ﬂow rates in particular rooms

Special (project related) requirements are, for example:

—Realisation of air ﬂow rates in particular rooms and, if re-

quired, in living and common spaces

—More stringent demands of ambient air quality (hygiene)

—More stringent demands of energy efﬁciency

—More stringent sound insulation requirements

—In accordance with DIN1946, Part6, a ventilation concept

must generally be drawn up for new builds as well as for ex-

isting buildings in which changes affecting ventilation have

been made (for example window replacement). This exam-

ines whether sufﬁcient humidity protection can be provided

through natural air changes due to permeability of the build-

ing envelope (inﬁltration). If the calculated inﬁltration ﬂow

rate is less than the air ﬂow rate required for humidity protec-

tion, measures to increase ventilation will be necessary.

Drawing up a ventilation concept to DIN1946, Part6

Ventilation concept for buildings/residential units

Windowless rooms?

Requirements for hygiene,

energy, sound insulation?

No ventilation measures

required

Ventilation measures re-

quired

Required ventilation measures

Total outdoor air ﬂow rate, humidity protec-

tion, air ﬂow rate through inﬁltration

Determine ventilation measures

Requirements for residential unit?

Ventilation calculation for windowless

rooms to DIN 18017-3

No calculation for

residential unit

Details of building

Number of storeys/height of building, wind area (strong winds/weak winds),

heat protection (high/low), building airtightness (n50 measured value/cate-

gory)

Details of residential unit

Geometry (heated living space, average room height, multi storey or single

storey), height above ground level, installation shaft

yes

yes no

no

Design

Ventilation concept

www.stiebel-eltron.com Ventilationtechnicalguide| 11

Combining further building service functions

Room heating

If the mechanical ventilation system should also be used for heat-

ing the building, the building or apartment standard heat load

must ﬁrst be calculated. This is carried out in line with EN12831.

The standard heat load of a room/building is deﬁned as follows:

the heating output that must normally be routed into the room/

building at the normal outdoor temperature (design temperature)

so that the normal indoor temperatures or the preferred room

temperatures can be attained.

The standard heat load is a characteristic of the room or building.

It forms the basis for sizing the heat generator or heat distribution

system (e.g. underﬂoor heating). The standard heat load is not to

be confused with the annual heat demand to DIN4108-6, which

is unsuitable for sizing the heat generator.

The standard heat load is composed of the thermal ﬂow through

thermal conduction via enclosing surfaces (transmission) and the

thermal ﬂow for heating incoming outdoor air (ventilation heat

load).

The result of this calculation is crucial to the sizing of the heat

pump system and is necessary for preparing a reliable quotation.

Both oversizing and undersizing a heat pump system is uneco-

nomical, disadvantageous to the system's operation and also limits

the system's operational reliability.

As a result of this calculation, the initial decisions made, regard-

ing units or system, may need to be reviewed.

Heating energy can be transmitted to the room or building either

via static heating surfaces (underﬂoor/area heating or radiators)

or by means of the supply air (ventilation system). The latter is only

possible if the heating output to be transmitted can be released

into the room or building with an air ﬂow rate which ensures

the minimum air change required to meet hygiene standards.

This must be carefully checked. The following guide values and

information must be observed:

—The supply air ﬂow rate speciﬁed in DIN 1946-6 must not be

increased.

—Per 100m

³

/h supply air, approx. 1kW heating output can be

transmitted.

—Per m² living space, approx. 10W can be transmitted.

—The maximum supply air temperature must be limited to

52°C.

—A buffer cylinder is required for central air/water heat ex-

changers.

—Control of room temperature on a room to room basis is only

possible to a limited extent.

—Additional static heating surfaces are often necessary in wet

rooms.

Static heating surfaces offer signiﬁcant advantages compared to

active space heating and are generally recommended. They are

comparatively easier to regulate, balance out ﬂuctuations, create

a buffer or use building mass as a buffer, transmit heating en-

ergy partly through radiation and ultimately offer a higher level

of comfort.

Design

Combiningfurtherbuildingservicefunctions

12 |Ventilationtechnicalguide www.stiebel-eltron.com

DHW heating

The ventilation units with integral DHW heating dealt with in

this guide are considered to be small systems as deﬁned in the

DVGWW551 Code of Practice. Small systems are all systems with

DHW cylinders or central instantaneous water heaters in detached

or two-family houses, independent of the cylinder size and pipe-

work capacity, as well as systems ≤400litres and a capacity ≤3li-

tres per pipe between the DHW cylinder connector and the draw-

off point. In small systems the operating temperature should not

fall below 50°C. In these systems too, a DHW temperature ≥60°C

must be able to be maintained.

Knowledge of the expected DHW demand is a basic condition to

be able to select the most suitable appliance for individual cases

and/or the required cylinder capacity.

The following tables enable the DHW demand to be determined

for appliances in households, relative to a DHW outlet temperature

of 55°C and a cold water temperature of 10°C.

VDEW measurement

AmountofDHW Specicusefulheat

l/60C° l/45°C kWh/dayxperson

20 30 1.2

VDI 2067, Part 12

Demand AmountofDHW Specicusefulheat

l/60°C l/45°C kWh/dayxperson

Low 10 - 20 15 - 30 0.6 - 1.2

Average 20 - 40 30 - 60 1.2 - 2.4

High 40 - 80 60 - 120 2.4 - 4.8

Part 12 of VDI2067 includes the project-related calculation of the

energy demand for DHW heating. It offers demands for DHW for

personal cleansing and care, as well as care and maintenance

in the household. It therefore serves as a basis for comparative

energy calculations.

Application examples from demand cases

Draw-offpoint Amount Temperature Cylindercapacity

l °C l/55°C

Sink 10 - 20 50 9 - 18

Bath tub 130 - 180 40 87 - 120

Shower 30 - 50 37 18 - 30

Wellness shower 80 - 130 37 48 - 78

Washbasin 10 - 15 37 6 - 9

Hand washbasin 2 - 5 37 1 - 3

Amount of mixed water

The amount of mixed water shown below is based on a cold water

inlet temperature of 10°C, a draw-off temperature of 40°C and a

draw-off rate of 10l/min.

LWA 100

100

110

120

130

140

150

160

45 50 55

D0000043347

X Cylinder temperature [°C]

Y Amount of mixed water [l]

LWA 252 / LWA 252 SOL

300

320

340

360

380

400

420

440

460

480

45 50 55

1

2

D0000043347

X Cylinder temperature [°C]

Y Amount of mixed water [l]

1 LWA 252

2 LWA 252 SOL

LWZ smart / LWZ 304 Trend / LWZ 404 Trend / LWZ 304 SOL /

LWZ 404 SOL / LWZ 504

200

220

240

260

280

300

320

340

360

380

45 50 55

D0000043347

X Cylinder temperature [°C]

Y Amount of mixed water [l]

Design

Basics

www.stiebel-eltron.com Ventilationtechnicalguide| 13

Cooling of buildings

Our mental capacities suffer severely at room temperatures that

are too low or too high. Comfortable room temperatures are there-

fore essential to our wellbeing.

The increasing demand for cooling in buildings is also partially

the result of higher internal and external loads, due to higher

comfort demands and substantial changes in construction meth-

ods. Large transparent surfaces in building walls as well as legal

requirements aimed at constantly improving building envelopes

are indicative of this trend. It goes without saying that the creation

of a thermally comfortable room climate must not ignore energy

and efﬁciency. System solutions designed to provide heating and

cooling alike generally promise low investment outlay and can be

efﬁciently operated with an intelligent control unit.

In most cases, cooling systems can ensure very good room comfort

with only little energy expenditure. The energy exchange between

a person and the cooling area predominantly takes the form of

radiation. Underﬂoor cooling is therefore a good start for a com-

fortable indoor environment. When using an area cooling system,

the cooling water temperature must always be safely above the

dew point temperature to prevent condensation forming on the

cooling surfaces. Subject to room temperature and humidity, the

room temperature may only be able to be reduced by a few kelvin.

For example, an underﬂoor heating system with a tiled ﬂoor and

spacing between pipes of 10cm has a speciﬁc cooling capacity

of 22W/m².

If the cooling load of a room is greater than the cooling capacity

of the underﬂoor heating system, the required room temperature

will not be reached or the cooling capacity of the cooling source

(for example the heat pump) will not be able to be transmitted to

the room or building. In this case a fan convector with a higher

cooling capacity must be installed. To compensate for the higher

cooling capacity of the cooling source (e.g. heat pump) we rec-

ommend using a buffer cylinder.

The supply air ﬂow rate of a mechanical ventilation unit is not

suitable for cooling buildings. We recommend the use of static

cooling surfaces and/or fan convectors.

Comfort zone (Leusden & Freymark)

12 16 20 24 2814 18 22 26

0

10

20

30

40

50

60

70

80

90

100

4

3

2

1

26_03_01_0391_

X Indoor air temperature in °C

Y Relative humidity in %

1 Comfortable

2 Just comfortable

3 Uncomfortably humid

4 Uncomfortably dry

Underﬂoor heating system cooling capacity

Floorcovering Tiles

Spacing between pipes cm 5 10 15 20 30

Room temperature °C 23 23 23 23 23

Flow temperature °C 15 15 15 15 15

Return temperature °C 20 20 20 20 20

Cooling capacity W/m² 26 22 19 17 13

Underﬂoor heating system heating output

Floorcovering Tiles Carpet

Spacing between pipes cm 5 10 15 20 30 5 10 15 20 30

Room temperature °C 20 20 20 20 20 20 20 20 20 20

Flow temperature °C 35 35 35 35 35 35 35 35 35 35

Return temperature °C 30 30 30 30 30 30 30 30 30 30

Heating output W/m² 65 55 50 45 30 40 37 32 28 24

Design

Basics

14 |Ventilationtechnicalguide www.stiebel-eltron.com

Fan convectors

Hydrima standalone appliance for cooling and heating; for ﬂoor-

standing or wall mounted installation. Indoor unit in an attractive

design, 3-stage fan operation, operating mode selector, dirt ﬁlter

and hardwired remote control.

PIC00001229

Window contact

An N/C contact can be connected via terminal strip WIN, terminals

5 and 6. With the contact open, the vent is closed and the fan is off.

Heating mode

Heat is transferred to the room air via the heat exchanger. The

multi stage fan constantly circulates the indoor air, which is

cleaned in the process by the integral ﬁlter. The air changes en-

sure a pleasant temperature distribution in the room.

Cooling mode

Heat is extracted from the indoor air by the heat exchanger and

transferred to the cooling source via the duct system. In the pro-

cess, condensate can be created at the heat exchanger of the in-

door unit under certain operating conditions; this must be drained

off via the condensate drain pipe.

a20

231

478

i13

150

360

g02

g01

b01i21

d45

e18

e19

80_06_26_0002

ACTH20 ACTH40 ACTH50

a20 Width mm 758 1128 1313

b01 Entry electrical cables

d45 Condensate drain

e18 Flow

e19 Return

g01 Air intake

g02 Air discharge

i13 Wall mounting bracket mm 498 868 1053

i21 Entry supply line

Cooling capacity of fan convectors

Type ACTH20 ACTH40 ACTH50

Part number for standard unit 189820 189821 189822

Coolingoperationoutputdata

Fan stage Low Medium High Low Medium High Low Medium High

Cooling water temperature °C 15/20 15/20 15/20 15/20 15/20 15/20 15/20 15/20 15/20

Cooling capacity at 23°C room temperature W 285 367 532 532 588 662 680 799 969

Cooling capacity at 25°C room temperature W 373 510 577 764 865 1036 940 1168 1505

Cooling capacity at 27°C room temperature W 459 647 747 974 1137 1402 1180 1495 2037

Cooling capacity at 29°C room temperature W 609 828 968 1291 1370 1747 1583 1947 2551

Cooling capacity at 31°C room temperature W 833 1121 1289 1786 2054 2464 2186 2712 3564

Heatingoperationoutputdata

Fan stage Low Medium High Low Medium High Low Medium High

Heating water temperature °C 50/40 50/40 50/40 50/40 50/40 50/40 50/40 50/40 50/40

Heating output at 15°C room temperature W 1600 2185 2780 3255 4570 5065 4955 6270 7250

Heating output at 18°C room temperature W 1475 2015 2565 3000 4215 4675 4570 5780 6685

Heating output at 20°C room temperature W 1405 1915 2440 2855 4015 4450 4350 5500 6365

Heating output at 22°C room temperature W 1315 1795 2285 2675 3760 4165 4075 5155 5960

Heating output at 24°C room temperature W 1230 1675 2130 2495 3505 3885 3800 4805 5560

Design

Basics

www.stiebel-eltron.com Ventilationtechnicalguide| 15

Air ﬂow rate calculation

The air ﬂow rate calculation is based on DIN1946, Part6. Accord-

ing to this standard, controlled mechanical ventilation is necessary

if the air ﬂow rate required for humidity protection exceeds the

air ﬂow rate from inﬁltration. Four ventilation operating stages

are speciﬁed.

—Ventilation for humidity protection

—Reduced ventilation

—Standard ventilation

—Intensive ventilation

The air ﬂow rate calculation is carried out for the "standard ven-

tilation" operating stage.

Determining the total ﬂow rate

To determine the total ﬂow rate required, the maximum value

of the ﬂow rates required for living space, extract air areas and

intended occupancy must ﬁrst be determined using the adjacent

tables.

q

v,ges

= max (q

v,Fläche

;

q

v,Abluft

; q

v,Person

) – q

v,Inf

q

v,ges

Standard ventilation ﬂow rate

q

v,Fläche

Flow rate according to living

space

q

v,Abluft

Flow rate derived from the sum

of the extract air areas

q

v,Person

Flow rate according to the

number of occupants

q

v,Inf

Flow rate through inﬁltration

Air ﬂow rate through inﬁltration

Every building is permeable to a certain extent. If differential

pressure occurs due to natural causes, this leads to the inﬁltration

(and also exﬁltration) of outdoor air. This inﬁltration ﬂow rate can

be determined in a simpliﬁed manner on the basis of the building

volume with the help of certain factors.

q

v,Inf

= f

Inf

* V

q

v,Inf

Flow rate through inﬁltration

f

Inf

Inﬁltration factor (table)

V Building volume to be ventilated

Due to the fact that a permanent, natural change of air takes place

via inﬁltration, the total ﬂow rate to be provided by the ventilation

unit can be reduced by the amount of the inﬁltration ﬂow rate.

Total ﬂow rate according to living space q

v,Fläche

Livingspaceinm² Flowrateinm³/h

≤30 55

50 75

70 95

90 115

110 135

130 155

150 170

170 185

190 200

210 215

230 230

250 245

Calculation: q

v,Fläche

= -0.001*A

ges

2

+ 1.15 *A

ges

+ 20

Total ﬂow rate according to the number of extract air areas

q

v,Abluft

Extractairareas Flowrateinm³/h

Kitchen 45

Bathroom 45

Shower/WC 45

WC 25

Utility room 25

Hobby room 25

Hallway (air extraction optional) 25

Total ﬂow rate according to the number of occupants q

v,Person

Numberofoccupants Flowrateinm³/h

1 30

2 60

3 90

4 120

5 150

6 180

Inﬁltration factors f

Inf

Typeofsupplyair Low-windbuild-

ing location

High-windbuild-

ing location

Central supply air 0.053 0.084

Decentralised supply air 0.059 0.059

Decentralised supply air

(open ﬂue ﬁreplace)

0.037 0.037

Valid for a new detached house up to a height of 15m in a normal building

location

High-wind building location: Average annual wind speed >3.3m/s

Design

Airowratecalculation

16 |Ventilationtechnicalguide www.stiebel-eltron.com

Determining the supply air ﬂow rates

Using the supply air factors from the adjacent table, the total ﬂow

rate calculated can be allocated to the individual supply air areas.

To do this, the associated factor for each room must be divided

by the total of all the factors determined for the building. This

quotient gives the proportion of the total ﬂow rate.

q

v,Zu,Raum

= (f

Zuluft,Raum

/ ∑f

Zuluft

) * q

v,ges

Building-speciﬁc characteristics can be taken into account by using

the given tolerance ranges of the individual factors.

Overﬂow area

Overﬂow areas are the areas between two rooms of an apartment,

where air ﬂows from the supply air area to the extract air area,

due to the pressure differential. Appropriate measures must be

taken to ensure that there is an overﬂow of air, e.g. by shortening

the door leaves at the bottom of the door or by installing suitable

ventilation grilles in doors or walls.

Determining the fan stages

The ﬂow rates for the individual fan stages can be calculated from

the total ﬂow rate.

Ventilationtype Flowrateformula

Ventilation for humidity protection (new

build)

q

v,FL

= 0.3 * q

v,ges

Reduced ventilation q

v,RL

= 0.7 * q

v,ges

Standard ventilation q

v,FL

= q

v,ges

Intensive ventilation q

v,IL

= 1.3 * q

v,ges

Intensive ventilation can also be ensured through user assistance

(opening windows) and must not necessarily only be provided by

the ventilation unit.

Supply air factors f

Zuluft

to DIN 1946, Part 6

Typeofutilisation Supplyairfactor

Living space 3.0 (±0.5)

Dining area 1.5 (±0.5)

Bedrooms 2.0 (±1.0)

Child 2.0 (±1.0)

Study 1.5 (±0.5)

Guest room 1.5 (±0.5)

Overﬂow apertures to DIN 1946, Part 6

Airowrate m

3

/h 10 20 30 40 50 60 70 80 90 100

Doorwithseal

Overﬂow area cm

2

25 50 75 100 125 150 175 200 225 250

Shortening meas-

urement

mm 3 6 8 11 14 17 20 22 25 28

Doorwithoutseal

Overﬂow area cm

2

0 25 50 75 100 125 150 175 200 225

Shortening meas-

urement

mm 0 3 6 8 11 14 17 20 22 25

Speciﬁcations to DIN 1946, Part 6

The shortening measurement speciﬁes by how many millimetres

an 89cm door leaf must be shortened.

Design

Airowratecalculation

www.stiebel-eltron.com Ventilationtechnicalguide| 17

Sample air ﬂow rate calculation

Using a sample building, the following explanation shows how

the total ﬂow rate as well as the supply and extract air rates for

the individual rooms can be calculated.

Building data:

—Detached house

—New build, low-wind location

—Ventilated living space: 135 m²

—3 occupants

Ground ﬂoor

2

12.0 m²

1

36.0 m²

11

8.0 m²

11

5.0 m²

11

5.0 m²

9

6.0 m²

4

3.0 m²

D0000042100

Top ﬂoor

1 Wohnen/Essen Zuluft

2 Küche Abluft

3 Bad/Dusche Abluft

4 WC Abluft

5 Schlafen/Eltern Zuluft

6 Kind Zuluft

7 Arbeiten Zuluft

8 Gast Zuluft

9 HWR Abluft

10 Abstellraum durchströmt

11 Flur/Treppe/Windfang durchströmt

12 Diele Abluft

13 Technik/Heizung Abluft

14 Garage unbelüftet

15 Dachboden unbelüftet

16 Dachdurchführung Fortluft

17 Dachdurchführung Außenluft

18 Lüftungsgerät

8

10.0 m²

5

16.0 m²

11

8.0 m²

3

10.0 m²

6

11.0 m²

11

5.0 m²

10

2.0 m²

D0000042101

1 Living space/dining room Supply air

2 Kitchen Extract air

3 Bathroom/shower Extract air

4 WC Extract air

5 Bedroom/parents Supply air

6 Child Supply air

8 Guest Supply air

9 Utility room Extract air

10 Storage room Receives airﬂow

11 Hallway/staircase/porch Receives airﬂow

The storage room is an ancillary room according to DIN1946-

6. Ancillary rooms are only included in the ventilation system

if humidity or pollutants are expected. Therefore, the storage

room is not ventilated in this example.

To determine the total ﬂow rate, the ﬂow rates required for the

living space, extract air areas and number of occupants must

ﬁrst be calculated.

Flow rate according to living space

A

ges

= 135m²

q

v,Fläche

= -0.001*(135 m²)² + 1.15 *(135 m²) + 20 = 157 m³/h

Flow rate according to the sum of the extract air areas

Kitchen m³/h 45

WC m³/h 25

Utility room m³/h 25

Bathroom m³/h 45

q

v,Abluft

m³/h 140

Flow rate according to the number of occupants

3 occupants

q

v,Person

= 90m³/h

In this sample building, the required maximum value is deter-

mined by the living space.

max (q

v,Fläche

;

q

v,Abluft

; q

v,Person

) = 157m³/h

In order to determine the ﬁnal design ﬂow rate, the natural out-

door air ﬂow rate through inﬁltration must be subtracted from

this, as it does not need be provided by the ventilation unit.

Flow rate through inﬁltration

Central supply air, low-wind location

A

ges

= 135m², room height = 2.5m

f

Inf

= 0.053

q

v,Inf

= 0.053 * 135m² * 2.5m = 18m³/h

Determining the total ﬂow rate

q

v,ges

= max (q

v,Fläche

; q

v,Abluft

; q

v,Person

) – q

v,Inf

q

v,ges

= 157m³/h – 18m³/h ~ 140m³/h

Design

Airowratecalculation

18 |Ventilationtechnicalguide www.stiebel-eltron.com

Determining the supply air ﬂow rates

Depending on how the area is used, the appropriate supply air

factor according to DIN 1946, Part 6 must be applied to each supply

air area, and the sum of all supply air factors then calculated.

f

supplyair

Living space 3.0

Bedrooms 2.0

Child 2.0

Guest 1.5

Total ∑(f

Zuluft

) 8.5

By means of the quotient of the supply air factor and the sum of

the supply air factors, the proportion of the total ﬂow rate can be

determined for each room.

q

v,Zu,Wohnen

= (3.0 / 8.5) * 140m³/h = 49m³/h

q

v,Zu,Schlafen

= (2.0 / 8.5) * 140m³/h = 33m³/h

q

v,Zu,Kind

= (2.0 / 8.5) * 140m³/h = 33m³/h

q

v,Zu,Gast

= (1.5 / 8.5) * 140m³/h = 25m³/h

Determining the extract air ﬂow rates

The extract air ﬂow rate can be found in the relevant table from

DIN 1946-6, depending on the type of use for each room. The

sum of all extract air rates must correspond to the total ﬂow rate

calculated. If this is not the case, the extract air rates must be

adjusted accordingly.

q

v,Ab

Kitchen m³/h 45

WC m³/h 25

Utility room m³/h 25

Bathroom m³/h 45

q

v,ges

= ∑(q

v,Ab

) = 140m³/h

Ventilation unit operating stages

If the total ﬂow rate (standard ventilation) is known, the associated

ﬂow rates for all four operating stages can be determined.

Ventilation for humidity protection:

q

v,FL

= 0.3 * 140 m³/h ~ 40 m³/h

Reduced ventilation:

q

v,RL

= 0.7 * 140 m³/h ~ 100 m³/h

Standard ventilation:

q

v,NL

= 1.0 * 140 m³/h = 140 m³/h

Intensive ventilation:

q

v,IL

= 1.3 * 140 m³/h ~ 180 m³/h

General information

The air distribution system is a key component of the ventilation

system. Design/engineering and implementation must be carried

out carefully and precisely, as subsequent changes often entail

signiﬁcant effort and associated cost.

Air distribution systems

In order to minimise pressure drop and installation effort, duct

runs should be kept as short as possible. It is therefore advisable

to install the ductwork so that it radiates out from the centre. The

total air ﬂow from the ventilation unit is supplied to the individual

rooms over several lines via central distribution units.

Ventila-

tion

Floor Room Area Height Volume Supplyairfac-

tor

Flowrate

m² m m³ m³/h

Supply air

Ground

ﬂoor

Living space/dining room 36.00 2.5 90.0 3.0 49

Attic Bedrooms 16.00 2.5 40.0 2.0 33

Attic Child 11.00 2.5 27.5 2.0 33

Attic Guest 10.00 2.5 25.0 1.5 25

Extract air

Ground

ﬂoor

Kitchen 12.00 2.5 30.0 45

Ground

ﬂoor

WC 3.00 2.5 7.5 25

Ground

ﬂoor

Utility room 6.00 2.5 15.0 25

Attic Bathroom 10.00 2.5 25.0 45

Overﬂow

Ground

ﬂoor

Porch 5.00 2.5 12.5

Ground

ﬂoor

Hallway 8.00 2.5 20.0

Ground

ﬂoor

Stairs 5.00 2.5 12.5

Attic Hallway 8.00 2.5 20.0

Attic Stairs 5.00 2.5 12.5

Building 135.00 2.5 337.5 8.5 140

Design

Airowratecalculation

www.stiebel-eltron.com Ventilationtechnicalguide| 19

Overview

Duct

Flexibel

LVE

Flexibel

LVS

Flatduct

LFK

Folded

spi-

ral-seam

tube

Distributor for

ﬂoor installation

• • •

Distributor for

wall installation

•

Flow rate dis-

tributor

m³/h max. 160 max. 240 max. 160 -

Wall outlets • • • •

Ceiling outlets • • • •

Floor outlets •

Designer venti-

lation grille

• •

Air ﬂow rate

control

At the dis-

tributor

At the vents At the vents At the vents

Connection tech-

nology

Click system Click system Push-ﬁt sys-

tem

Push-ﬁt sys-

tem

Duct

Plastic oval

duct

Plastic circu-

lar duct

Sheet steel

rectangular

duct

Sheet steel

circular duct

Standard duct

lengths

m 20 25 2 2

Installation methods

Installation on an unﬁnished ﬂoor (in screed) or within concrete

ceilings is preferable for the new build sector. Installation in light-

weight construction walls is also possible.

Installation in suspended ceilings and in the attic area has also

proven particularly favourable for modernisation projects.

In this case, a folded spiral-seam tube system is the preferred

means of implementing the main distribution from the ventilation

unit. This also allows higher ﬂow rates with low pressure drops

and speeds, due to the larger cross-sectional areas.

Possible installation methods and suitable distribution systems

Installation

method

Flexibel

LVE

Flexibel

LVS

Flatduct

Foldedspi-

ral-seam

tube

Floor structure

(screed)

• •

Internal walls • •

Concrete ceiling •

Filigree ceiling •

Wooden joist ceiling • • •

Suspended ceiling • • •

Below the ceiling • • •

Attic area • • •

Long pane of the

roof/jamb wall

• • •

Application range

When sizing the ventilation system, the maximum ﬂow rates for

supply and extract air must be observed, taking account of the

distribution system and nominal diameter. If these ﬂow rates are

exceeded, there is more risk of noise and increased pressure drop.

Flow rates

The table shows the maximum recommended air ﬂow rates.

Distribu-

tionsystem

Nominal

diameter

Max.owrate Speed* Pressure

drop*

Flexible LVE 130 x 52 45 m³/h 3.0 m/s 5.1 Pa/m

Flexible LVS DN75 30 m³/h 2.6 m/s 3.3 Pa/m

Flat duct

100 x 50 40 m³/h 2.2 m/s 1.5 Pa/m

150 x 50 60 m³/h 2.2 m/s 1.3 Pa/m

200 x 50 80 m³/h 2.2 m/s 1.2 Pa/m

200 x 80 125 m³/h 2.2 m/s 0.7 Pa/m

Folded spi-

ral-seam tube

DN 100 85 m³/h 3.0 m/s 1.5 Pa/m

DN 125 135 m³/h 3.0 m/s 1.2 Pa/m

DN 160 220 m³/h 3.0 m/s 0.9 Pa/m

DN 180 275 m³/h 3.0 m/s 0.8 Pa/m

* At maximum ﬂow rate

Flow rates are determined on the basis of DIN1946-6, which rec-

ommends sizing the distributor ducts according to a ﬂow velocity

of 3m/s, whereby a moderate pressure drop should also be taken

into account. For ventilation systems marked with an "E" (particu-

larly energy efﬁcient), adherence to the maximum ﬂow velocity in

all ducts (apart from manifolds) is absolutely essential.

Design

Airdistributionsystems

20 |Ventilationtechnicalguide www.stiebel-eltron.com

General information

This central, plastic air distribution system is designed for inte-

gration in the insulation layer below the screed, in suspended

ceilings or in lightweight construction walls. It is unique due to

its high level of robustness and low installed height of just 52mm.

The patented oval pipe comprises a robust corrugated outer pipe

and a smooth inner pipe, through which air ﬂow rates of up to

45m³/h can be transported with a moderate pressure drop. The

small number of components and the intelligent "click" connection

system enable fast installation without tools.

Installation

Air is distributed to each room, radiating out from a central, 4-way

distributor. In order to avoid unnecessarily long ducts, we rec-

ommend positioning the supply and extract air distributors as

centrally as possible on one ﬂoor. Extract air is extracted near the

ceiling via wall or ceiling outlets. In the supply air area, additional

ﬂoor outlets can be installed. The distributor is connected to the

ventilation unit with a folded spiral-seam tube; a special proﬁle

connects the distributor to the main duct. In detached houses up

to approx. 200m², one riser and 1 or 2 distributors for the supply

air, and the same for the extract air are usually sufﬁcient for ven-

tilation to DIN1946-6.

Distributors and proﬁles are ﬁxed to the ﬂoor or wall using integral

eyelets. Special mounting clips are available for the oval pipe.

The pipe and proﬁles can be connected and made airtight using

push-ﬁt adaptors.

Several ducts installed side by side can reduce the load bearing

capacity of the screed when embedded in the ﬂoor; a minimum

clearance of approx. 120mm is therefore recommended. If this

cannot be achieved due to building characteristics, the relevant

screed area must be reinforced.

Cleaning

Due to the radiating design and the resulting short duct runs, the

pipework can be easily cleaned. The system can be cleaned via

the distributor with integral inspection port as well as via the air

outlets, using a combined brush/vacuum system. The distribu-

tor cover can be removed together with the adjustment device,

making subsequent adjustments to the air ﬂow rate superﬂuous.

Cleaning apertures should also be provided at the lowest point of

the risers (main distribution); the installation of tees in connection

with cleaning covers has proven to be a good solution.

Installation example with distributor and ceiling outlet set into

the ﬂoor above

26_04_01_0610_

5

7

2 3

4

1

10 9 8

6

1 Thermal insulation/impact sound insulation

2 Optional thermal insulation/impact sound insulation

3 Screed

4 Floor covering

5 Air distributor with distributor cover

6 Distributor cover

7 Riser

8 Flexible duct

9 Concrete ceiling

10 Ceiling outlet with ventilation grille

Installation example with wall mounted distributor and ﬂoor

outlet

1

2

3

6

9 8

26_04_01_0611_

54

7

1 Thermal insulation/impact sound insulation

2 Optional thermal insulation/impact sound insulation

3 Floor outlet with ventilation grille

4 Floor covering

5 Screed

6 Air distributor with inspection port

7 Connection, main duct, straight

8 Flexible duct

9 Concrete ceiling

Design

LVEexibleairdistributionsystem

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STIEBEL ELTRON Engineering and | Ventilation Technical Guide

STIEBEL ELTRON Engineering and | Ventilation Technical Guide

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