Meltem M-WRG-II M-U2 User manual

Meltem Wärmerückgewinnung GmbH & Co. KG
Am Hartholz 4 · D-82239 Alling
[email protected] · www.meltem.com
VENTILATION THE RIGHT WAY
VENTILATION & HEAT RECOVERY
INSTALLATION MANUAL
HOME VENTILATION WITH HEAT RECOVERY
M-WRG-II M-U2installation kit
for integrating the M-WRG-II ventilation unit series
into the wall in solid walls and frame constructions
Part no. 744003EN Week 33/2020 EN

Installation manual
M-WRG-II M-U2
- 2 -
Meltem Wärmerückgewinnung GmbH & Co. KG
Am Hartholz 4 · D-82239 Alling
[email protected] · www.meltem.com
VENTILATION THE RIGHT WAY
VENTILATION & HEAT RECOVERY
Contents
1 Introduction ................................................................................................................... 5
1.1 Notes on this installation manual .................................................................................... 5
1.2 Description ...................................................................................................................... 5
1.3 Target group .................................................................................................................... 6
1.4 Nameplates ..................................................................................................................... 6
1.5 Storage ........................................................................................................................... 6
1.6 Revision index ................................................................................................................ 7
1.7 Explanation of the symbols used .................................................................................... 7
1.8 Supplementary documents ............................................................................................. 7
2 Safety instructions ....................................................................................................... 8
2.1 Hazardclassication ....................................................................................................... 8
2.2 Notes on using the ventilation units safely ...................................................................... 8
2.2.1 Fire protection ................................................................................................................. 8
2.2.2 Operationwithreplaces ................................................................................................ 8
2.2.3 Installation in wet areas .................................................................................................. 9
2.2.4 Condensate drain ........................................................................................................... 9
2.2.5 Starting and using the ventilation unit ............................................................................. 9
2.3 Notes on using the ventilation units ................................................................................ 9
2.4 Note on use in conjunction with room air conditioners ................................................. 10
2.5 Intended use ................................................................................................................. 10
3 Planning notes ............................................................................................................. 11
3.1 Positioning the ventilation unit indoors .......................................................................... 11
3.2 Unrestricted access to the ventilation unit .................................................................... 12
3.3 Additional planning notes for this installation kit ........................................................... 12
3.3.1 Firesafetyandsoundproong ...................................................................................... 12
3.3.2 Flat ductwork ................................................................................................................ 13
3.3.3 Flexible pipes ................................................................................................................ 13
3.4 Retrospectivelyush-mountingtheinstallationkit ........................................................ 13
3.5 Electrical connection ..................................................................................................... 14
3.6 Special notes for installation in solid walls .................................................................... 14
3.7 Special notes for installation in frame constructions ..................................................... 14
3.7.1 Planning example for installing the installation kit in a frame construction with a
framing member thickness of 160 mm .......................................................................... 15
4 Warranty and liability .................................................................................................. 16
4.1 Warranty ....................................................................................................................... 16
4.2 Liability .......................................................................................................................... 16
5 Items supplied ............................................................................................................. 17
5.1 M-WRG-II M-U2installation kit, part no. 712000 ........................................................... 17
5.2 Options ......................................................................................................................... 17
5.3 Installation materials required ....................................................................................... 17
6 Dimensions of the installation kit ............................................................................. 18

Installation manual
M-WRG-II M-U2
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Meltem Wärmerückgewinnung GmbH & Co. KG
Am Hartholz 4 · D-82239 Alling
[email protected] · www.meltem.com
VENTILATION THE RIGHT WAY
VENTILATION & HEAT RECOVERY
7 General installation instructions ............................................................................... 19
8 Installing the installation kit in a solid wall .............................................................. 19
8.1 Tools and equipment required ...................................................................................... 19
8.2 Breaking through the wall ............................................................................................. 20
8.2.1 Planning the wall breakthrough for new builds ............................................................. 20
8.2.2 Breaking through an existing wall ................................................................................. 20
8.3 Chasingoutchannelsforatductworkorexiblepipes ............................................... 21
8.3.1 Chasingoutchannelsfortwoatductworkconnections(singleroomversion) ........... 21
8.3.2 Chasingoutchannelsforconnectingatductwork(multi-roomversion) ..................... 22
8.3.3 Chasingoutchannelsforconnectingexiblepipes(multi-roomversion) ..................... 23
8.4 Chasing out channels for connecting cables ................................................................ 24
8.5 Running the mains and control cables .......................................................................... 25
8.5.1 Cable types ................................................................................................................... 26
8.5.2 External control input .................................................................................................... 26
8.5.3 Option M-WRG-II O/EGG-AUS ..................................................................................... 27
8.6 Inserting the wall box .................................................................................................... 28
8.7 Inserting the protective cover and plaster cover ........................................................... 28
8.8 Fixing the wall box ........................................................................................................ 29
8.9 Filling gaps around the wall box with foam ................................................................... 30
8.10 Insertingatductworkintochannels ............................................................................. 30
8.11 Cuttingexiblepipestolength ...................................................................................... 31
8.12 Insertingexiblepipesintotheexiblepipeconnection ............................................... 31
8.13 Plasteringtheinstallationkitandatductwork/exiblepipesontheinside ................ 32
8.14 Condensate drain on the exhaust air pipe .................................................................... 33
8.15 Aligning the wall box on the outside before plastering .................................................. 34
8.15.1 If the solid wall is less than 42.5 cm thick ..................................................................... 34
8.15.2 If the solid wall is more than 42.5 cm thick ................................................................... 34
8.16 Plastering the installation kit on the outside .................................................................. 35
8.17 Preparing the installation kit for connecting the ventilation pipes ................................. 36
8.18 Cutting ventilation pipes to length ................................................................................. 36
8.19 Insertingandxingtheventilationpipes ....................................................................... 37
8.20 Sealing ventilation pipes on external wall ..................................................................... 38
8.21 Attaching the outer wall terminal ................................................................................... 38
9 Installing the installation kit in a frame construction .............................................. 39
9.1 Tools and equipment required ...................................................................................... 39
9.2 Creating a mount for the installation kit in a frame construction ................................... 40
9.3 Chasingoutchannelsforatductworkorexiblepipes ............................................... 41
9.4 Running the mains and control cables .......................................................................... 42
9.4.1 Cable types ................................................................................................................... 43
9.4.2 External control input .................................................................................................... 44
9.4.3 Option M-WRG-II O/EGG-AUS ..................................................................................... 45
9.5 Insertingandxingthewallbox .................................................................................... 46
9.6 Inserting the protective cover and plaster cover ........................................................... 47
9.7 Filling gaps around the wall box with insulating material .............................................. 48
9.8 Connecting the wall box to the vapour barrier .............................................................. 48
9.9 Insertingatductworkintochannels ............................................................................. 49
9.10 Cuttingexiblepipestolength ...................................................................................... 50

Installation manual
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Meltem Wärmerückgewinnung GmbH & Co. KG
Am Hartholz 4 · D-82239 Alling
[email protected] · www.meltem.com
VENTILATION THE RIGHT WAY
VENTILATION & HEAT RECOVERY
9.11 Insertingexiblepipesintotheexiblepipeconnection ............................................... 50
9.12 Claddingtheinstallationkitandatductwork/exiblepipesontheinside .................. 51
9.13 Condensate drain on the exhaust air pipe .................................................................... 52
9.14 Aligning the wall box on the outside before plastering .................................................. 53
9.14.1 If the wall is less than 42.5 cm thick ............................................................................. 53
9.14.2 If the wall is more than 42.5 cm thick ............................................................................ 53
9.15 Plastering the installation kit on the outside .................................................................. 54
9.16 Preparing the installation kit for connecting the ventilation pipes ................................. 55
9.17 Cutting ventilation pipes to length ................................................................................. 55
9.18 Insertingandxingtheventilationpipes ....................................................................... 56
9.19 Sealing ventilation pipes on external wall ..................................................................... 57
9.20 Attaching the outer wall terminal ................................................................................... 57
10 Installing the ventilation unit ..................................................................................... 58
11 Installation example for installation in a solid wall ................................................. 58

Installation manual
M-WRG-II M-U2
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Meltem Wärmerückgewinnung GmbH & Co. KG
Am Hartholz 4 · D-82239 Alling
[email protected] · www.meltem.com
VENTILATION THE RIGHT WAY
VENTILATION & HEAT RECOVERY
1 Introduction
1.1 Notes on this installation manual
This installation manual contains important information that should be followed when
installing the M-WRG-II M-U2installation kit for the M-WRG-II series of ventilation units.
►Read all the instructions carefully before installing the kit to avoid possible risks and
mistakes.
►When assembly is complete, give these instructions to the home owner, caretaker or
property manager.
►These instructions are part of the product. Keep the instructions in a safe place for
future reference.
WARNING
►Follow ALL danger and warning instructions and notes on precautionary measures.
►Read chapters 2 “Safety instructions” on page 8 and 3 “Planning notes” on
page 11 carefully.
1.2 Description
Thismanualdescribeshowtoush-
mount the M-WRG-II M-U2installation kit
(item1inFig.1)insolidwallsandframe
constructions. This installation kit is used
to integrate ventilation units from the
M-WRG-II series fully into the wall. Two
atductworkconnectionsortwoexible
pipe connections oroneatductwork
connectionandoneexiblepipeconnec-
tion may be used in the extract air and
supply air openings. In solid construc-
tions, if a complete wall aperture is
planned for the installation kit in a new
build, for example, or if a complete wall
breakthroughisplannedforaretrot,
theoptionalllerpieceM-WRG-IIM/Fü
(item2inFig.1)canbeusedtopack
outthewall.Ifrequired,thellerpiece
can be used in the same way in a frame
construction.
Fig. 1: Installation kit M-WRG-II M-U2and optional
llerpieceM-WRG-IIM/Fü
1
2

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Am Hartholz 4 · D-82239 Alling
[email protected] · www.meltem.com
VENTILATION THE RIGHT WAY
VENTILATION & HEAT RECOVERY
1.3 Target group
The activities described in this manual must only be carried out by specialised personnel
withthefollowingqualications:
— Training in the installation and commissioning of electrical devices
— Training in electrical hazards and the local safety requirements
— Knowledge of the relevant standards and directives
— Knowledge and observance of this document and all the safety instructions
1.4 Nameplates
The nameplates are attached in two places:
— ontheplastercover(seeitem1inFig.2)
— besidethecableinletforthemainsandcontrolcables(item1inFig.3)
Fig. 2: Nameplate on the plaster cover
1
Fig. 3: Nameplate on wall box
1
1.5 Storage
►Store the installation kit in its original packaging in a dry place where the temperature
ranges between 0 °C and +40 °C.

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Meltem Wärmerückgewinnung GmbH & Co. KG
Am Hartholz 4 · D-82239 Alling
[email protected] · www.meltem.com
VENTILATION THE RIGHT WAY
VENTILATION & HEAT RECOVERY
1.6 Revision index
Edition Manual Date
4th edition Installation manual M-WRG-II M-U2Week 33/2020 EN
1.7 Explanation of the symbols used
►This symbol indicates an action to be taken.
— This symbol indicates a list.
1.8 Supplementary documents
Manual Part no.
Installation manual for M-WRG-II ventilation units 744004EN
Installation manual for outer wall terminals M-WRG-II ES, M-WRG-II KSR 744005EN
Installation manual for window reveal installation kit 744006EN
OperatinginstructionsforM-WRG-IIP(-F,-FC),M-WRG-IIE(-F,-FC)
ventilation units
744007EN
Table 1: Supplementary documents

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VENTILATION THE RIGHT WAY
VENTILATION & HEAT RECOVERY
2 Safety instructions
This manual contains notes that you must follow for your own personal safety and to
avoid injury and damage to property. They are highlighted by warning triangles and are
shown as follows according to the level of danger.
2.1 Hazard classication
DANGER
The signal word designates a hazard with a high degree of risk which, if it is not
avoided, will result in death or severe injury.
WARNING
The signal word designates a hazard with a medium degree of risk which, if it is not
avoided, will result in death or severe injury.
CAUTION
The signal word designates a hazard with a low degree of risk which, if it is not avoided,
could result in minor or moderate injury.
NOTICE
A note as used in this manual contains important information about the product or about
a part of the manual to which particular attention should be paid.
2.2 Notes on using the ventilation units safely
2.2.1 Fire protection
Followthegenerallyapplicableresafetyrequirementswhenplanningandinstallingthe
unit.
2.2.2 Operation with replaces
— Anadditionalsafetydevice(underpressureordi󰀨erentialpressuremonitor)isneeded
to monitor operation when M-WRG-II ventilation units are used in conjunction with
replaces.
— FollowtherequirementsoftheGermanFireCode(FeuVo)whenplanningand
installing the unit.
— Contact the local chimney sweep before the end of the planning phase.
— Have the chimney sweep approve the operation of the ventilation unit.
— Correct use of a ventilation system set up with the decentralised ventilation unit
requiresthepossibilityofshuttingo󰀨combustionairpipesanduesystemsforsolid
fuelreplacesduringperiodsinwhichthereplacesarenotinuse.

Installation manual
M-WRG-II M-U2
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Meltem Wärmerückgewinnung GmbH & Co. KG
Am Hartholz 4 · D-82239 Alling
[email protected] · www.meltem.com
VENTILATION THE RIGHT WAY
VENTILATION & HEAT RECOVERY
2.2.3 Installation in wet areas
ThefollowingrulesfromDINVDE0100-701/702(IEC60364-7-701)applytoinstallation
of M-WRG-II ventilation units in wet areas:
— Protection zone 0: The unit must NOT be installed in this area.
— Protection zone 1: The unit must only be installed with the “integrated into wall” U2
variant. The extract and supply air valves must be installed in the top part of the wall
or in the ceiling.
— Protection zone 2 and other zone: The unit may be installed in this area.
Country-specicstandards/regulationsonobservingtheprotectionzonesforinstallation
in rooms with bathtub or shower must also be followed.
2.2.4 Condensate drain
The heat recovery process in our ventilation units causes condensation. This condensa-
tion is dissipated via the exhaust air pipe.
— If M-WRG-II P ventilation units are used, a condensate connection should be provided
(seesection8.14onpage33).
— WithM-WRG-IIEventilationunits(withenthalpyheatexchanger)thereisnoconden-
sationifthefollowingrequirementsarefullled:
— Theventilationunitisoperatedasdescribedin“Intendeduse”(seesection2.5on
page10)andthe“Rulesforcorrectusage”chapteroftheoperatinginstructions.
— There is no exceptional loading due to very high atmospheric humidity.
2.2.5 Starting and using the ventilation unit
— Do not start up the ventilation unit until it is fully installed.
— Always make sure that the cover is closed and locked in place before using the venti-
lation unit.
— Please note that the ventilation unit must not be used without the outer wall terminal
for safety reasons.
2.3 Notes on using the ventilation units
— This unit may be used by children from 8 years old and by persons of restricted phys-
ical, sensory or mental abilities or persons lacking experience and knowledge if they
are supervised or have been instructed in how to use the unit safely and understand
the associated hazards. Do not allow children to play with the unit. Cleaning and user
maintenance must not be carried out by children unless they are supervised.
►Follow the regulations applicable in your country concerning the age from which
people may be permitted to operate the ventilation unit.

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VENTILATION THE RIGHT WAY
VENTILATION & HEAT RECOVERY
— The ventilation unit must always be freely accessible for operation and maintenance.
►Make sure that the ventilation unit is not covered or obstructed when the room is
subsequently decorated and furnished, otherwise it cannot be operated and it will
notbepossibletoreplacetheairlters.Youshouldthereforemaintainaclearance
of at least 15 cm in front of the ventilation unit cover.
►Make sure that the supply and extract air openings are not covered when the room
is subsequently decorated and furnished, otherwise the ventilation unit’s functions
may be impaired.
2.4 Note on use in conjunction with room air conditioners
Condensation may form in the ventilation unit if the outdoor air temperature and humidity
are high, but the room temperature is cool.
For these conditions, we recommend using the M-WRG-II E ventilation unit with enthalpy
heat exchanger. This has the advantage of removing both sensible and latent heat from
thesupplyair.Asaresult,theairisdehumidiedaswellasbeingprecooled.Theroom
air conditioner needs to do less work, so the user saves money on the reduced power
consumption.
2.5 Intended use
— The ventilation unit is designed to ventilate living spaces and rooms used for
quasi-residential purposes. The ventilation unit is installed in a perpendicular position
intheexternalwall.Anydi󰀨erentormoreextensiveusagewillberegardedascontrary
to the intended use.
— The intended use also includes compliance with all the notes in the operating instruc-
tions.
— Theventilationunitmustnotbeoperatedwithoutairltersorouterwallterminal.
— The ventilation unit is intended for use in rooms with normal room air humidity levels
of approx. 40 % to 70 % RH. It must not be installed in rooms in which the relative
humidity during operation constantly exceeds 80 %.
— The ventilation unit’s functions may be impaired or the unit may be damaged in rooms
withalotofdust(e.g.model-making)orcorrosivegasemissions(e.g.blueprintshop,
cleaning).
— Foranyusecontrarytotheintendeduse,MeltemWärmerückgewinnungGmbH&Co.KG
shallacceptnoliabilityforanydamagethatmayoccurando󰀨ersnowarrantythatthe
ventilation unit will work perfectly and correctly.

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VENTILATION THE RIGHT WAY
VENTILATION & HEAT RECOVERY
3 Planning notes
3.1 Positioning the ventilation unit indoors
The ventilation unit must be installed indoors in a perpendicular position on an external
wall.
— Theush-mountinstallationkit(wallbox)mustbeinstalledsothattheopeningsfor
theexiblepipe/atductworkconnectionsalwayspointup(seeFig.4).
— Theatductworksystemo󰀨ersconsiderablefreedomwhenpositioningtheextractair
and supply air openings and the installation kit. The openings may be made directly
ontheinstallationkitoro󰀨sethorizontally(item1inFig.4)orvertically(item2in
Fig.4).Thisallowstheinstallationkittobepositionedexactlyasrequired(item3in
Fig.4).
Fig. 4: Minimum distances and options for positioning the M-WRG-II M-U2installation kit,
dimensions in millimetres
min. 50
min. 300
min.50(*)
1
2
3
(*) Ifacondensateconnection(seesection8.14onpage33)isused,theminimumdimensionsmustbe
adapted to suit the local conditions. This applies, in particular, if condensate is drained inwards, e.g. via a
greywater outlet.
— Thebeste󰀨ectforairexchangeisachievedifthesupplyandextractairopeningsare
as high up the wall as possible or in the ceiling.
► Maintainthefollowingminimumdistances(seeFig.4andFig.5):
— For this installation kit, the distance between the top edge of the wall box and
the ceiling must be at least 300 mm, otherwise there will not be enough space
forconnectingatductworkorexiblepipes.
— The distance between the side and bottom edges of the wall box and adjacent
surfacesshouldbeatleast50mm(exception:ifacondensateconnection
isused,see(*)inFig.4).Theventilationunitwillbeeasiertooperateifthis
minimumdistanceismaintained.Italsoallowstheairltertobereplaced
without obstruction.
— Position the supply air and extract air openings so as to avoid a short circuit
betweenthetwoairows.Forexample,onlylouvredgrillesshouldbeusedin
the openings in the arrangement of extract air and supply air openings shown
in Fig. 12 on page 22.

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Meltem Wärmerückgewinnung GmbH & Co. KG
Am Hartholz 4 · D-82239 Alling
[email protected] · www.meltem.com
VENTILATION THE RIGHT WAY
VENTILATION & HEAT RECOVERY
— The lateral distance between two wall boxes must not be less than 200 mm to
prevent an air short circuit between the ventilation units.
Fig. 5: Lateral minimum distance between two wall boxes, dimensions in millimetres
min. 200
Dividing wall
NOTICE
Follow the notes in Table 2 on page 26 when planning the unit. This contains informa-
tion about the types of mains and control cable for each ventilation unit and the recom-
mended operating options.
3.2 Unrestricted access to the ventilation unit
The ventilation unit must always be freely accessible for operation and maintenance.
►Make sure that the ventilation unit is not covered or obstructed when the room is
subsequently decorated and furnished, otherwise it cannot be operated and it will not
bepossibletoreplacetheairlters.Youshouldthereforemaintainaclearanceofat
least 15 cm in front of the ventilation unit cover.
►Make sure that the supply and extract air openings are not covered when the room is
subsequently decorated and furnished, otherwise the ventilation unit’s functions may
be impaired.
3.3 Additional planning notes for this installation kit
3.3.1 Fire safety and soundproong
WARNING
Observe the relevant re safety and soundproong regulations
► Observetheregulationsconcerningtherebehaviourofbuildingmaterialsand
componentsasdenedinDIN4102(EN13501).
► Observetheregulationsconcerningsoundproonginbuildingsasdenedin
DIN 4109, particularly the requirements for insulation against airborne and impact
sound.
►Observe the building regulations applicable in your country.

Installation manual
M-WRG-II M-U2
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Meltem Wärmerückgewinnung GmbH & Co. KG
Am Hartholz 4 · D-82239 Alling
[email protected] · www.meltem.com
VENTILATION THE RIGHT WAY
VENTILATION & HEAT RECOVERY
3.3.2 Flat ductwork
NOTICE
► Observethefollowingrecommendationswhenusingatductworktoavoidunneces-
sary pressure losses in the ducts.
— Makesurethatthewallaperturedoesnota󰀨ectthelocalstaticloadingandther-
mal insulation requirements.
— Horizontal runs in the external wall should be as short as possible.
— Thetotallengthofaatductshouldnotexceed6m,aspermittedbythestatic
calculations.
— Minimisethenumberofbendsintheatductwork.
3.3.3 Flexible pipes
NOTICE
► Observethefollowingrecommendationswhenusingexiblepipestoavoidunnec-
essary pressure losses in the pipes.
— Alwaysconnecttwoexiblepipestotheexiblepipeconnection.
— Asfaraspossible,useexiblepipeswithadiameterof75mm.
— Thetotallengthofeachexiblepipeshouldnotexceed10m.
— Minimisethenumberofbendsintheexiblepipes.
— Runthetwoexiblepipesofaexiblepipeconnectioninparalleltooneanother.
Theminimumdistancebetweentheexiblepipesmustnotbelessthan3xthe
pipe diameter.
3.4 Retrospectively ush-mounting the installation kit
WARNING
Danger from emerging gas or electric shock
► Makesurethattherearenosupplylinesinthevicinityofthewallbreakthrough(e.g.
power,gasorwater).
► Makesurethatthewallbreakthroughdoesnota󰀨ectthelocalstaticloadingrequire-
ments.
►Fit a lintel if necessary.
► Ifyouareinstallingthekitretrospectively,runtheexiblepipesinasuspended
ceiling.

Installation manual
M-WRG-II M-U2
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Meltem Wärmerückgewinnung GmbH & Co. KG
Am Hartholz 4 · D-82239 Alling
[email protected] · www.meltem.com
VENTILATION THE RIGHT WAY
VENTILATION & HEAT RECOVERY
3.5 Electrical connection
Theworkingvoltagerangeoftheventilationunitisbetween85VACand265VAC/
50-60 Hz.
NOTICE
If the ventilation unit is not equipped with a mains connection cable and plug or other
means of disconnecting from the mains supply that has, at each pole, a contact opening
width that conforms to the conditions of overvoltage category III for complete separa-
tion,thensuchanisolatingunit(e.g.circuitbreaker)mustbeintegratedintotheperma-
nently installed electrical system in accordance with the installation regulations. The
isolatingunitmustbeidentiedassuchandeasytoaccess.
3.6 Special notes for installation in solid walls
Theinstallationkitcanbeinstalledinsolidwallsthatareatleast30cmthick(including
internalplaster,externalrenderandinsulation).
►For wall structures that are 70 cm thick or more, you will need 100 cm long outdoor
andexhaustairpipes(M-WRG-LR100,partno.5580).
NOTICE
Theinstallationkitxestheventilationpipeswitha2°falltotheexternalwall.
— Theinstallationkitcanbeshortenedbyupto165mm(tonolessthan273mm).If
theunplasteredwallisthin(30cmorless),donotcuto󰀨theinstallationkitushwith
theunplasteredwall(seesection8.15onpage34).Allowthekittoprotrudeinto
theexternalthermalinsulationcompositesystem(ETICS)asthisistheonlywayto
allowtheventilationpipestopassfarenoughthroughandsobexedinplace.
— WhenttingtheETICS,makesurethattheventilationpipesmaintaintheir2°fall.
3.7 Special notes for installation in frame constructions
The installation kit can be installed in frame constructions with walls that are at least
30cmthick(includinginternalplaster,externalrenderandinsulation).
►For wall structures that are 70 cm thick or more, you will need 100 cm long outdoor
andexhaustairpipes(M-WRG-LR100,partno.5580).
NOTICE
Theinstallationkitxestheventilationpipeswitha2°falltotheexternalwall.
— Theinstallationkitcanbeshortenedbyupto165mm(tonolessthan273mm).
Allow the kit to protrude into the external thermal insulation composite system
(ETICS)asthisistheonlywaytoallowtheventilationpipestopassfarenough
throughandsobexedinplace.
— WhenttingtheETICS,makesurethattheventilationpipesmaintaintheir2°fall.

Installation manual
M-WRG-II M-U2
- 15 -
Meltem Wärmerückgewinnung GmbH & Co. KG
Am Hartholz 4 · D-82239 Alling
[email protected] · www.meltem.com
VENTILATION THE RIGHT WAY
VENTILATION & HEAT RECOVERY
3.7.1 Planning example for installing the installation kit in a frame construction
with a framing member thickness of 160 mm
Fig. 6: Planning example for installing the installation kit in a frame construction with a framing member thickness of
160 mm
A- A
B- B
C
D
A
A
B
B
C
D
129
3
4
5
6 7 108
8
8
10
11
12
4
1
00
1
60
1
5
1
5
1
2,5
1
5
31
7,5
56
102 58
100
118
60
7
6
10
Cutouts in the
upperbattenforat
ductwork
Cutouts in the
lowerbattenforat
ductwork
Option:
M-WRG-IIM/Fü
llerpiece
Note the excess pipe length
speciedintheinstallationman-
ual for the outer wall terminals.
M-WRG-II ES: 5-10 mm
TheOSBboard(item6)
andplasterboard(item7)
extend over the installa-
tionkit(item10).Inthis
version no cutouts are
needed in the OSB board
fortheatductwork.
289 M-WRG-II M-U2
(shortened)
Detail of version 1
List of components
Item Description
1 15 mm external render
2Woodbreinsulation
3 15 mm OSB board
4 160 x 60 mm framing member
5 160 mm insulation
6 15 mm OSB board
7 12.5 mm plasterboard
8Batten(supportandxingforinstallationkit)
9 Outdoor air and exhaust air pipe DN 100
10 Installation kit M-WRG-II M-U2
(option:M-WRG-IIM/Füllerpiece)
11 M-WRG-FK-Vatductworkconnector110x54mm
12 M-WRG-FK-Fatductwork110x54mm

Installation manual
M-WRG-II M-U2
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Meltem Wärmerückgewinnung GmbH & Co. KG
Am Hartholz 4 · D-82239 Alling
[email protected] · www.meltem.com
VENTILATION THE RIGHT WAY
VENTILATION & HEAT RECOVERY
NOTICE
Frameconstructionsareimplementedinmanydi󰀨erentways,soitisnotpossibleto
provide a generally-applicable description for every variant. This planning example
shows the installation in a frame construction with a framing member thickness of
160 mm. The installation will have to be adapted accordingly for other framing member
thicknesses or wall structures.
►If you are in any doubt, please send us a dimension drawing of your wall section so
we can provide you with a custom solution.
4 Warranty and liability
4.1 Warranty
The following cases shall invalidate the warranty:
— The installation kit was not installed as described in the installation manual.
— The ventilation unit was not installed as described in the installation manual.
— Theventilationunitwasush-mountedwithoutusingaush-mountinstallationkit.
— Genuineparts/genuineairlterswerenotreplacedwithgenuineparts.
— Unapproved changes were made to the installation kit or ventilation unit.
— Repairs were not carried out by Meltem or by an authorised specialist company.
— Theventilationunitwasoperatedwithoutairltersandouterwallterminals.
— Thewarrantydoesnotcoverwearingpartssuchasairlters.
4.2 Liability
The manufacturer’s liability shall not apply in the following cases:
— The installation kit was not installed as described in the installation manual.
— The ventilation unit was not installed as described in the installation manual.
— Theventilationunitwasush-mountedwithoutusingaush-mountinstallationkit.
— Genuineparts/genuineairlterswerenotreplacedwithgenuineparts.
— Unapproved changes were made to the installation kit or ventilation unit.
— Repairs were not carried out by Meltem or by an authorised specialist company.
— Theventilationunitwasoperatedwithoutairltersandouterwallterminals.

Installation manual
M-WRG-II M-U2
- 17 -
Meltem Wärmerückgewinnung GmbH & Co. KG
Am Hartholz 4 · D-82239 Alling
[email protected] · www.meltem.com
VENTILATION THE RIGHT WAY
VENTILATION & HEAT RECOVERY
5 Items supplied
Fig. 7: Items supplied with the installation kit M-WRG-II M-U2
1
2
3
4
5
5.1 M-WRG-II M-U2installation kit, part no. 712000
Item Description Quantity
1 Plaster cover for wall box 1x
2 Protective cover 1x
3 Wall box 1x
4 Protective sleeve 2x
5.2 Options
Item Description Part no.
5InstallationkitllerpieceM-WRG-IIM/Fü 735003
- Plaster scrim M-WRG-II PG 735000
5.3 Installation materials required
Additionalinstallationmaterialsareneededforush-mountinstallation.Thesemustbe
ordered separately.
Item Description Part no.
- Outdoor air and exhaust air pipe, DN 100, 2 x 0.5 m,
M-WRG-LR 50
5574
- If a condensate connection is used:
Outdoor air and exhaust air pipes, DN 100, 2 x 0.5 m, exhaust
air pipe with 1/2” male thread condensate connection,
M-WRG-II LR 50-KA
735200

Installation manual
M-WRG-II M-U2
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Meltem Wärmerückgewinnung GmbH & Co. KG
Am Hartholz 4 · D-82239 Alling
[email protected] · www.meltem.com
VENTILATION THE RIGHT WAY
VENTILATION & HEAT RECOVERY
6 Dimensions of the installation kit
Fig. 8: Dimensionsoftheinstallationkitwithoptionalllerpieceinmillimetres
88
125
63
660
148
194,5
208,5
75 / 63 Ø
83
84,5 115
58
167
434,5
15
438
410
165
273
A
B
M-WRGFK-V
part no. 5591
M-WRG-IIM/Fü,optional
part no. 735003
A Cableinletforthemainsandcontrolcables(acontrolcableisonlyneededforcertainventi-
lationunits,seeTable2onpage26)
B Theinstallationkitcanbeshortenedbyupto165mm(tonolessthan273mm).
Twoatductworkconnectionsortwoexiblepipeconnectionsoroneatductworkconnec-
tionandoneexiblepipeconnectionmaybeusedintheextractairandsupplyairopenings.
Acongurationwithatductwork(FK)andexiblepipeconnection(diameterof75/63mm)
wasusedinFig.8toillustratethedimensioningoftheatductworkandexiblepipeconnec-
tions.
NOTICE
With the M-WRG-II WM-M-U2option, part no. 720005, the kit can be shortened at the
factory to a minimum length of 258 mm.

Installation manual
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Meltem Wärmerückgewinnung GmbH & Co. KG
Am Hartholz 4 · D-82239 Alling
[email protected] · www.meltem.com
VENTILATION THE RIGHT WAY
VENTILATION & HEAT RECOVERY
7 General installation instructions
The M-WRG-II M-U2installation kit is suitable for installation in solid walls and frame
constructions:
— Installation of the installation kit in solid walls is described in section “8 Installing
the installation kit in a solid wall” from page 19.
— Installation of the installation kit in frame constructions is described in
section “9 Installing the installation kit in a frame construction” from page 39.
NOTICE
— The unit must be installed in accordance with the generally acknowledged rules of
technology.
— Connections with adjacent components must be formed to absorb movements
between the contact surfaces.
— Sealanyconnectionsthatareexposedtodrivingrainwithtapes,prolesorsealants
suchthattheyo󰀨ersu󰀩cientprotectionagainsttheexpectedconditions.
WARNING
Follow the relevant accident prevention regulations
►Follow the accident prevention regulations when setting up the installation location.
►Protect the outside area against falling parts.
8 Installing the installation kit in a solid wall
8.1 Tools and equipment required
— Permanently elastic sealant, solvent-free if applied to polystyrene
— Sealing tape, 30 mm wide, e.g. Coroplast
— Wedgesforxingthewallbox,8x
alternativelyuseinatableaircushions,4x,e.g.Amo-BagfromWürth,
part no. 07156780
— Ifnecessary,wedgesforxingthellerpiece,4x
alternativelyuseinatableaircushions,2x,e.g.Amo-BagfromWürth,
part no. 07156780
— Adhesive tape
— Wall chaser
— ExpandingfoamwithabP(nationaltechnicaltestcerticateoftheDIBt)approval
(“exactgap”foamisrecommended)
— Saw for cutting the ventilation pipes to length
— Styrofoam saw
— Spirit level
NOTICE
If the installation kit is to be retrospectively installed in a solid wall, you will need addi-
tional tools to break through the wall.

Installation manual
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[email protected] · www.meltem.com
VENTILATION THE RIGHT WAY
VENTILATION & HEAT RECOVERY
8.2 Breaking through the wall
The wall breakthrough can either be included when planning a new build or subsequently
made in the solid wall.
Fig. 9: Wall breakthrough for installation kit
withoutllerpiece,dimensionsin
millimetres
456
680
min. 300
min. 50
273
420
456
680
min. 300
min. 50
Fig. 10: Wall breakthrough for installation kit with
llerpiece,dimensionsinmillimetres
8.2.1 Planning the wall breakthrough for new builds
►Commission an architect or design professional to include the wall breakthrough at
a suitable point in the construction drawing and execute it when constructing the
building shell.
There are two possible versions of the wall breakthrough:
— Wallbreakthroughwithrecess(seeFig.9)forinstallationkitwithoutllerpiece
M-WRG-IIM/Fü
— Completewallbreakthrough(seeFig.10)forinstallationkitwithllerpiece
M-WRG-IIM/Fü
8.2.2 Breaking through an existing wall
WARNING
Danger due to damaging supply lines and changing the stress loadings
► Makesurethattherearenosupplylinesinthevicinityofthewallbreakthrough(e.g.
power,gasorwater).
► Makesurethatthewallbreakthroughdoesnota󰀨ectthelocalstaticloadingrequire-
ments.
►Fit a lintel if necessary.