Meltem M-WRG-Z-T 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
OPERATING INSTRUCTIONS
HOME VENTILATION WITH HEAT RECOVERY
Ventilation unit
M-WRG-S/Z-T
M-WRG-S/Z-T-F
M-WRG-S/Z-T-FC
Part no. 5302-22-01 Week 14/2018 EN
CO²

Operating instructions
M-WRG-S/Z-T(-F,-FC) ventilation unit
- 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 the operating instructions .................................................................................. 5
1.2 Description ........................................................................................................................ 5
1.3 Target group ..................................................................................................................... 6
1.4 EU declaration of conformity ............................................................................................ 6
1.5 National technical approval (for Germany) ....................................................................... 7
1.6 Nameplate ........................................................................................................................ 7
1.7 Technical data ................................................................................................................... 7
1.7.1 Electrical connection ......................................................................................................... 7
1.7.2 Dimensions and weight .................................................................................................... 7
1.7.3 Noise emission ................................................................................................................. 8
1.7.4 Unit properties .................................................................................................................. 8
1.7.5 Unit features ..................................................................................................................... 8
1.7.6 Airlters ............................................................................................................................ 8
1.8 Storage ............................................................................................................................. 8
1.9 Environmentally-friendly disposal ..................................................................................... 9
1.10 Revision index .................................................................................................................. 9
1.11 Explanation of the symbols used ...................................................................................... 9
2 Safety instructions ....................................................................................................... 10
2.1 Hazardclassication ....................................................................................................... 10
2.2 Notes on using the ventilation units safely ..................................................................... 10
2.3 Notes on using the ventilation units ................................................................................. 11
2.4 Intended use .................................................................................................................... 11
3 Warranty and liability ................................................................................................... 12
3.1 Warranty ......................................................................................................................... 12
3.2 Liability ............................................................................................................................ 12
4 Dimensions ................................................................................................................... 12
5 Structure and function ................................................................................................. 13
5.1 Overview of the modules ................................................................................................ 13
5.1.1 Ventilation unit – cover attached ..................................................................................... 13
5.1.2 Ventilation unit – cover removed .................................................................................... 13
5.1.3 Outer wall terminal .......................................................................................................... 13
5.2 Description of the functions ............................................................................................ 14
5.2.1 How the M-WRG ventilation unit works .......................................................................... 14
5.2.2 Howthecross-owplateheatexchangerworks ............................................................ 15
6 Rules for correct usage ............................................................................................... 15
6.1 General ........................................................................................................................... 15
6.2 Operation in high atmospheric humidity ......................................................................... 15
6.3 Operation at cold times of year ....................................................................................... 16
6.4 Airlters .......................................................................................................................... 16
7 Controls and displays .................................................................................................. 17
7.1 Controls on the ventilation unit ....................................................................................... 17
7.2 InControl pushbutton sensor .......................................................................................... 17
7.2.1 InControl pushbutton sensor for the type M-WRG-S/Z-T ventilation unit ....................... 17

Operating instructions
M-WRG-S/Z-T(-F,-FC) ventilation unit
- 3 -
Meltem Wärmerückgewinnung GmbH & Co. KG
Am Hartholz 4 · D-82239 Alling
[email protected] · www.meltem.com
VENTILATION THE RIGHT WAY
VENTILATION & HEAT RECOVERY
7.2.2 InControl pushbutton sensor for the type M-WRG-S/Z-T-F ventilation unit .................... 18
7.2.3 InControl pushbutton sensor for the type M-WRG-S/Z-T-FC ventilation unit ................. 18
8 Starting up ..................................................................................................................... 19
8.1 Checkventilationunitbeforeswitchingonforrsttime .................................................. 19
8.2 Switch on the ventilation unit .......................................................................................... 19
8.3 Checkpositionofairaps .............................................................................................. 19
9 Operating the ventilation unit ...................................................................................... 20
9.1 Selecting the ventilation program with the InControl pushbutton sensor ........................ 20
9.2 Set ventilation unit to Standby mode .............................................................................. 20
9.3 Frost protection function ................................................................................................. 20
10 Ventilation programs .................................................................................................... 21
10.1 “Reduced ventilation (people absent)” program ............................................................. 21
10.2 “Normal ventilation (people present)” program ............................................................... 21
10.3 “Increased ventilation” program ...................................................................................... 21
10.4 “Intensive ventilation (15 min)” program ......................................................................... 21
10.5 “Supply air operation (Summer mode)” program ............................................................ 22
10.6 “Extract air operation” program ....................................................................................... 22
10.7 “Humidity control” program ............................................................................................. 22
10.8 “Mixed gas/CO2control” program or “Automatic mode” as an option ............................. 22
11 Filter maintenance ........................................................................................................ 23
11.1 Choiceoflter ................................................................................................................. 23
11.2 Orderinglters ................................................................................................................ 23
11.3 Changingtheairlters .................................................................................................... 24
11.3.1 Remove cover from ventilation unit ................................................................................ 24
11.3.2 Removeairlters ............................................................................................................ 24
11.3.3 Insertnewairlters ........................................................................................................ 25
11.3.4 Attach cover to ventilation unit ........................................................................................ 25
11.3.5 Resetlterchangeindicator ........................................................................................... 26
12 Cleaning ........................................................................................................................ 26
13 Troubleshooting ........................................................................................................... 27

Operating instructions
M-WRG-S/Z-T(-F,-FC) ventilation unit
- 4 -
Meltem Wärmerückgewinnung GmbH & Co. KG
Am Hartholz 4 · D-82239 Alling
[email protected] · www.meltem.com
VENTILATION THE RIGHT WAY
VENTILATION & HEAT RECOVERY

Operating instructions
M-WRG-S/Z-T(-F,-FC) ventilation unit
- 5 -
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 the operating instructions
These original operating instructions contain important information that should be followed when
setting up and using the M-WRG-S/Z-T(-F,-FC) ventilation units.
►Read all the instructions carefully before starting up the ventilation unit to avoid possible
risks and mistakes.
►When assembly is complete, give these instructions to the home owner, caretaker or prop-
erty 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 section „2 Safety instructions“ on page 10 carefully.
1.2 Description
These instructions describe how to set up and operate the decentralised ventilation units
M-WRG-S/Z-T(-F,-FC) (see Fig. 1).
M-WRG-S stands for Meltem heat recovery standard unit. Home ventilation expertise extending
back over 35 years has been incorporated into this product from Meltem Wärmerückgewinnung.
Using windows for ventilation, particularly during periods of cold weather, is now a thing of the past.
This ventilation unit brings in outdoor air fully automatically, and heats it by recovering heat from
Fig. 1: Ventilation unit M-WRG-S/Z-T...

Operating instructions
M-WRG-S/Z-T(-F,-FC) ventilation unit
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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 air that is extracted. Outdoor air and extract air are routed in separate ducts through a cross-
owplateheatexchanger(seesection5.2.2onpage15).Yousaveonheatingcosts,increase
your living comfort and are kind to the environment by reducing CO2emissions.Anairlteralso
removes pollen, dust and other impurities from the outdoor air.
The ventilation units are designed for continuous operation and can be both surface-mounted and
ush-mounted.Theventilationunitsarelow-maintenance,butregular lter changes are impor-
tant.
The ventilation units M-WRG-S/Z-T(-F,-FC) have
six ventilation programs which are activated using
the InControl pushbutton sensor M-WRG-T/... (see
Fig. 2). The LEDs integrated into the pushbutton
sensor indicate the currently selected ventilation
program.Uptoveventilationunitsofthesame
type can be controlled with one InControl pushbut-
ton sensor.
The ventilation unit M-WRG-S/Z-T-F also has a
humidity control program. In addition to the humidity
control, the M-WRG-S/Z-T-FC also has an integrat-
ed mixed gas/CO2control program. Mixed gases
are volatile organic compounds (VOCs) and are
the second important measurement, after the CO2
content, for assessing the air quality. An integrated
microprocessor calculates the optimum air renewal from the values measured by the humidity,
mixed gas and CO2sensors and sets the correct ventilation level fully automatically.
Section „10 Ventilation programs“ from page 21 sets out and describes the ventilation programs
for each type of ventilation unit.
1.3 Target group
These operating instructions are intended for users of the ventilation unit. No special prior knowl-
edge is needed.
1.4 EU declaration of conformity
The ventilation units described below
Type: Part number
M-WRG-S/Z-T 5016-1-1
M-WRG-S/Z-T-F 5016-1-1-1
M-WRG-S/Z-T-FC 5016-1-1-2
manufactured by
Meltem Wärmerückgewinnung GmbH & Co. KG
Am Hartholz 4
82239 Alling
conform to the regulations and standards listed in the EU Declaration of Conformity provided.
Fig. 2: InControl pushbutton sensor M-WRG-T/...
CO²

Operating instructions
M-WRG-S/Z-T(-F,-FC) ventilation unit
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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
1.5 National technical approval (for Germany)
A valid national technical approval from the
Deutsches Institut für Bautechnik (DIBt) must be
obtained for the ventilation unit before it is in-
stalled in Germany. This approval can be provided
upon request or can be downloaded from our web-
site at www.meltem.com/waermerueckgewinnung/
downloads/ (see also the QR code on the back
page of these instructions).
The approval number is Z-51.3-138 (see item 1 in
Fig. 3).
►For installation outside Germany, the
national regulations applicable in your
country should be followed.
1.6 Nameplate
Youwillndthenameplateontheintermediateplateontheinsideofthehousing(seeitem2in
Fig. 3 on page 7).
1.7 Technical data
1.7.1 Electrical connection
Operating voltage 85 to 265 V AC
Mains frequency 50 to 60 Hz
Power consumption 3.8 to 37 W
Power consumption in relation
totheairvolumeow
0.17 W/m3/h (at 30 m3/h)
Maximum current consumption 0.16 A
Connecting cable NYM-J3x1.5mm2
IP rating IPX1
IPX4 with protective cap on mains switch
(optional, must be installed at the factory)
1.7.2 Dimensions and weight
Unit dimensions excluding air connectors
(see also Fig. 4 on page 12)
409 mm x 388 mm x 196 mm (H x W x D)
Visible unit depth when surface-mounted 196 mm
Visibleunitdepthwhenush-mounted 66 mm
Outdoor air/exhaust air connectors DN 100
Weight Approx. 8.1 kg
Fig. 3: Approval number and nameplate

Operating instructions
M-WRG-S/Z-T(-F,-FC) ventilation unit
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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
1.7.3 Noise emission
Sound pressure level LP, Aush-mount 15.5 to 46.5 dB(A)/Aeq 10 m2
Sound pressure level LP, A surface-mount 19 to 46 dB(A)/Aeq 10 m2
Sound insulation Dn,e,wush-mount/surface-mount 50/50 dB
1.7.4 Unit properties
Airow 15 to 100 m3/h
Heatrecoveryefciency Up to 76 %
Leakage 0.1 %
1.7.5 Unit features
Output control 4 levels
Supply air/extract air fan EC direct current motor, radial fan
Heat exchanger Cross-owplateheatexchanger
Filter change indicator (according to the level of
soilingofthelteroratleastoneyearsincethe
lastlterchange)
Audible and visual (“Normal ventilation” pro-
gramLEDashesontheInControlpushbut-
ton sensor, see section 10.2 on page 21)
Condensate drainage Via exhaust air pipe, no condensate trap
required
Fullyautomaticcoverapcontrolwhenswitching
On / Off, in Standby mode and if the power fails
Yes
Frost protection function Yes
Fault indicator Yes(“Reducedventilation”programLED
ashesontheInControlpushbuttonsensor,
see section 10.1 on page 21)
1.7.6 Air lters
Designation Filter class Filter area
Standardlter G4 0.36 m2
Allergylter(optional) F7 0.32 m2
Activatedcharcoallter(optional) M6 0.12 m2
1.8 Storage
►Store the ventilation unit in its original packaging in a dry place where the temperature
ranges between 0 °C and +40 °C.

Operating instructions
M-WRG-S/Z-T(-F,-FC) ventilation unit
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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
1.9 Environmentally-friendly disposal
The ventilation unit components must not be disposed of in the residual waste bin.
►In Germany, metal and plastic components should be disposed of at the local recy-
cling centre. The national regulations in other EU states should also be followed.
►In Germany, electrical components should be disposed of in accordance with the
Electrical and Electronic Equipment Act (ElektroG). In other EU states, the na-
tional implementation of the Waste Electrical and Electronic Equipment Directive
2012/19/EU (WEEE) should be followed.
►In Germany, rechargeable batteries and accumulators should be disposed of in ac-
cordance with the Batteries Act (BattG). The national implementation of the Battery
Directive 2006/66/EC should be followed in other EU states.
►The regulations and statutory requirements in your own country concerning disposal
should also be followed.
1.10 Revision index
Edition Manual Date
5th edition Operating instructions M-WRG-S/Z-T(-F,-FC) ventilation unit Week 14/2018 EN
1.11 Explanation of the symbols used
►This symbol indicates an action to be taken.
— This symbol indicates a list.

Operating instructions
M-WRG-S/Z-T(-F,-FC) ventilation unit
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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 Safety instructions
These instructions contain 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.
NOTE
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
WARNING
—Fire protection
►Follow the requirements of the national technical approval from the Deutsches Institut
für Bautechnik (DIBt), approval number Z-51.3-138, when planning and installing the
unit.
—Operation with replaces
►An additional safety device (underpressure or differential pressure monitor) is need-
ed to monitor operation when M-WRG ventilation units are used in conjunction with
replaces.
►Follow the requirements of the German Fire Code (FeuVo) when planning and install-
ing 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.
—Installation in wet areas
The following rules from DIN VDE 0100-701/702 (IEC 60364-7-701) apply to installation in
wet areas:
— Protection zone 0 and 1: The unit must NOT be installed in these areas.
— Protection zone 2: The unit may be installed in this area if the mains switch is covered
with a protective cap. The protective cap must be installed at the factory.

Operating instructions
M-WRG-S/Z-T(-F,-FC) ventilation unit
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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
► Youwillneedtoincludethemainsswitchprotectivecap(M-WRG-SN,
part no. 5430) when you order the ventilation unit.
— Other zone: The unit may be installed in this area.
—Build-up of icicles and ice patches at low temperatures
The heat recovery process in our ventilation units causes condensation. This condensa-
tion is dissipated to the outside via the exhaust air pipe. When external temperatures drop
below 0 °C this can cause a build-up of icicles at the outer wall terminals and ice patches
on the ground.
CAUTION
—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.
2.3 Notes on using the ventilation units
— This unit may be used by children from 8 years old and by persons of restricted physical,
sensory or mental abilities or persons lacking experience and knowledge if they are super-
vised 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 peo-
ple may be permitted to operate the ventilation unit.
— The ventilation unit must always be freely accessible for operation and maintenance.
►Make sure that the ventilation unit is not blocked, obstructed or covered when the
room is subsequently decorated and furnished, otherwise it cannot be used and it will
notbepossibletoreplacethelter.
►Make sure that the supply and extract air openings are not blocked, obstructed or
covered when the room is subsequently decorated and furnished.
2.4 Intended use
— The ventilation unit is intended for supplying air to and extracting air from living and recrea-
tionrooms(bedrooms,playrooms,livingrooms,bathrooms,basementworkshops,ofces,
consulting rooms, etc.). The ventilation unit is installed in a perpendicular position in the
external wall. Any different 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 instructions.
— Theventilationunitmustnotbeoperatedwithoutairlters.
— 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 offers no warranty that the
components will work perfectly and correctly.

Operating instructions
M-WRG-S/Z-T(-F,-FC) ventilation unit
- 12 -
Meltem Wärmerückgewinnung GmbH & Co. KG
Am Hartholz 4 · D-82239 Alling
[email protected] · www.meltem.com
VENTILATION THE RIGHT WAY
VENTILATION & HEAT RECOVERY
3 Warranty and liability
3.1 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.
— 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.
— Thewarrantydoesnotcoverwearingpartssuchasairlters.
3.2 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.
— 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.
4 Dimensions
Fig. 4: Dimensions of the ventilation unit M-WRG-S/Z-T... in millimetres
109
388
409
66
Ø 99
85106 218
Ø 99
57 130

Operating instructions
M-WRG-S/Z-T(-F,-FC) ventilation unit
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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
5 Structure and function
5.1 Overview of the modules
5.1.1 Ventilation unit – cover attached
Item Designation
1 Housing
2 Cover
3 Stepping switch for three power levels
+ intensive ventilation level
4 Mains switch
5.1.2 Ventilation unit – cover removed
Item Designation
1Supplyairopeningwithairap
2Supplyairlterwithltercover
3 Intermediate plate
4 Network connection cover
5 Supply air hood
6Extractairlterwithlterring
7Extractairopeningwithairap
5.1.3 Outer wall terminal
Item Designation
1 Opening for drawing in outdoor air
2 Opening for blowing out exhaust air
Fig. 5: Ventilation unit – cover attached
Fig. 6: Ventilation unit – cover removed
Fig. 7: Outer wall terminal

Operating instructions
M-WRG-S/Z-T(-F,-FC) ventilation unit
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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
5.2 Description of the functions
5.2.1 How the M-WRG ventilation unit works
The supply air fan (item 5 in Fig. 9) transports outdoor air (item 7 in Fig. 8) through the supply air
lter(item2inFig.9)andcross-owplateheatexchanger(item3inFig.9)intotheinterioras
supply air (item 4 in Fig. 8). The extract air fan (item 4 in Fig. 9) extracts the extract air (item 3 in
Fig.8)fromtheinterior.Intheextractairlter(item1inFig.9),theextractairiscleaned,guided
throughthecross-owplateheatexchangerandcarriedoutsideasexhaustair(item8inFig.8).
The supply air and extract air fans each transport the same volume of air. The pressure in the inte-
rior remains practically constant.
Item Designation
1 M-WRG ventilation unit
2 Internal wall side
3 Extract air
4 Supply air
5 External wall side
6 Outer wall terminal
7 Outdoor air
8 Exhaust air
Item Designation
1Extractairlter
2Supplyairlter
3Cross-owplateheatexchanger
4 Extract air fan
5 Supply air fan
Fig. 8: How the ventilation unit works
Fig. 9: Components for air exchange

Operating instructions
M-WRG-S/Z-T(-F,-FC) ventilation unit
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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
5.2.2 How the cross-ow plate heat exchanger works
The warm extract air (item 5 in Fig. 10) drawn in from the interior is routed through the chambers of
thecross-owplateheatexchanger(item1inFig.10)andheatsthem.
The cooled extract air is carried to the outside as exhaust air (item 3 in Fig. 10).
At the same time, the cold outdoor air that is drawn in (item 2 in Fig. 10) is routed through the
chambersofthecross-owplateheatexchanger,whichareseparatefromtheextractair,andis
heated. The separate chambers prevent the outdoor air and extract air from mixing.
The heated outdoor air is routed into the interior as supply air (item 4 in Fig. 10).
Item Designation
1Cross-owplateheatexchanger
2 Outdoor air
3 Exhaust air
4 Supply air
5 Extract air
6 Rules for correct usage
6.1 General
►Run the ventilation unit in continuous operation. The constant ventilation creates a good
and healthy atmosphere in the room.
► Adapttheairowthroughtheventilationunittotakeaccountoftheairloadcreatedby
cooking, washing, ironing, visitors, showers, sauna, etc.
►Set the ventilation unit so that the relative humidity ranges between 40 % and 65 %.
People feel most comfortable within this range.
6.2 Operation in high atmospheric humidity
NOTE
►In the summer months, ventilate cellars and similar rooms only during the night. Otherwise
condensation from the atmospheric humidity can cause damage due to damp on the cold
walls.
Fig. 10: Howthecross-owplateheat
exchanger works

Operating instructions
M-WRG-S/Z-T(-F,-FC) ventilation unit
- 16 -
Meltem Wärmerückgewinnung GmbH & Co. KG
Am Hartholz 4 · D-82239 Alling
[email protected] · www.meltem.com
VENTILATION THE RIGHT WAY
VENTILATION & HEAT RECOVERY
6.3 Operation at cold times of year
NOTE
►During cold times of year, run the ventilation unit in continuous mode.
— Do not use the “Supply air operation” program in sub-zero temperatures (see section
10.5 on page 22). Otherwise the ventilation unit will constantly activate the frost
protection function or switch off altogether.
— Energy-saving motors and an innovative controller ensure a very low power con-
sumption, even in continuous mode (roughly 3.8 W at the lowest level).
— Continuous removal of moisture from the interior is only guaranteed in continuous
mode.
— The condensate is only routed outside in continuous mode.
►In the following cases, run a 10-minute intensive ventilation at maximum power level:
— regularly if there is high atmospheric humidity in the interior
— if you need to switch off the ventilation unit.
This will remove any condensate that is present in the ventilation unit.
►Maintain the temperature in bedrooms at 16 °C to 18 °C or more. This temperature is
also more healthy for the people in the bedrooms. Do not run the ventilation unit at room
temperatures below 15 °C, and particularly not at low external temperatures below -5 °C.
Otherwise the ventilation unit will constantly activate the frost protection function or switch
off altogether. The higher the interior temperature, the bigger the buffer for operating the
ventilation unit and for heat recovery.
6.4 Air lters
► Neverruntheventilationunitwithoutairlters.
► AlwaysusegenuineMeltemlters.ThesearepreciselymatchedtoyourM-WRGventi-
lation units, ensure minimal pressure losses and will ensure a long service life from your
ventilation units.
► Forhygienereasons,replacebothltercartridgesatleast1xeveryyear,ideallybeforethe
period of cold weather.
► Observetheaudibleandvisuallterchangeindicatorandreplacetheairltersasneces-
sary.

Operating instructions
M-WRG-S/Z-T(-F,-FC) ventilation unit
- 17 -
Meltem Wärmerückgewinnung GmbH & Co. KG
Am Hartholz 4 · D-82239 Alling
[email protected] · www.meltem.com
VENTILATION THE RIGHT WAY
VENTILATION & HEAT RECOVERY
7 Controls and displays
7.1 Controls on the ventilation unit
Item Designation
1 Mains switch
I = Ventilation unit “On"
O = Ventilation unit “Off"
2 Stepping switch for three power levels:
Power level I = 15 m3/h
Power level II = 30 m3/h
Power level III = 60 m3/h
Intensive ventilation level (15 min):
Switching sequence I-II-I = 100 m3/h
NOTE
The power level selected on the stepping switch
(item 2 in Fig. 11) is also signalled by the associat-
ed LED on the InControl pushbutton sensor.
7.2 InControl pushbutton sensor
The InControl pushbutton sensor allows you to select one of six different ventilation programs. The
available ventilation programs depend on the type of ventilation unit. Every button has an LED that
indicates the currently selected ventilation program.
7.2.1 InControl pushbutton sensor for the type M-WRG-S/Z-T ventilation unit
Fig. 11: Controls on the ventilation unit
Reduced
ventilation
(people absent) /
Standby mode
Increased ventilation
Supply air operation
(Summer mode)
Normal
ventilation
(people present)
Intensive ventilation
(15 min)
Extract air operation
Fig. 12: InControl pushbutton sensor for the type
M-WRG-S/Z-T ventilation unit

Operating instructions
M-WRG-S/Z-T(-F,-FC) ventilation unit
- 18 -
Meltem Wärmerückgewinnung GmbH & Co. KG
Am Hartholz 4 · D-82239 Alling
[email protected] · www.meltem.com
VENTILATION THE RIGHT WAY
VENTILATION & HEAT RECOVERY
7.2.2 InControl pushbutton sensor for the type M-WRG-S/Z-T-F ventilation unit
7.2.3 InControl pushbutton sensor for the type M-WRG-S/Z-T-FC ventilation unit
Reduced
ventilation
(people absent) /
Standby mode
Increased ventilation
Humidity control
Normal
ventilation
(people present)
Intensive ventilation
(15 min)
Supply air operation
(Summer mode)
Fig. 13: InControl pushbutton sensor for the type
M-WRG-S/Z-T-F ventilation unit
Reduced
ventilation
(people absent) /
Standby mode
Increased ventilation
Humidity control
Normal
ventilation
(people present)
Intensive ventilation
(15 min)
Mixed gas/
CO2control
or
Automatic mode
(as an option)
Fig. 14: InControl pushbutton sensor for the type
M-WRG-S/Z-T-FC ventilation unit
CO²

Operating instructions
M-WRG-S/Z-T(-F,-FC) ventilation unit
- 19 -
Meltem Wärmerückgewinnung GmbH & Co. KG
Am Hartholz 4 · D-82239 Alling
[email protected] · www.meltem.com
VENTILATION THE RIGHT WAY
VENTILATION & HEAT RECOVERY
8 Starting up
8.1 Check ventilation unit before switching on for rst time
►Check the ventilation unit for damage.
►Check that the openings for extract air and supply air are unobstructed.
8.2 Switch on the ventilation unit
►Switch the ventilation unit on at the mains switch (item 1 in Fig. 11 on page 17).
Afterapprox.10s,theairapsontheextractairandsupplyairopeningsopen.
8.3 Check position of air aps
NOTE
► Checkthepositionoftheairaps(seeFig.15andFig.16)ontheextractairandsupply
air openings.
— Bothairapswillbeclosediftheventilationunitisswitchedofforwithoutpower(see
item 1 in Fig. 15).
— Bothairapsopenwhenyouswitchon(seeitem1inFig.16).
NOTE
Iftheairapsdonotopenfullyafterswitchingonforthersttimeorafteralongerstoppage,follow
the steps below:
►Switch the ventilation unit off.
►Wait at least 15 s.
►Switch the ventilation unit on again.
Theairapsshouldopenfully.Ifthisisnotthecase,repeattheabovesteps.
Fig. 15: Airapsclosed Fig. 16: Airapsopen

Operating instructions
M-WRG-S/Z-T(-F,-FC) ventilation unit
- 20 -
Meltem Wärmerückgewinnung GmbH & Co. KG
Am Hartholz 4 · D-82239 Alling
[email protected] · www.meltem.com
VENTILATION THE RIGHT WAY
VENTILATION & HEAT RECOVERY
9 Operating the ventilation unit
9.1 Selecting the ventilation program with the InControl pushbutton sensor
— Press one of the six buttons on the InControl pushbutton sensor to select the required
ventilation program (see section 10 on page 21). The LED on the corresponding button
lights up.
— If there are multiple ventilation units of the same type connected to an InControl pushbut-
ton sensor, the same ventilation program is activated for all the ventilation units.
— If there are multiple ventilation units of the same type with humidity and/or mixed gas/CO2
control connected to an InControl pushbutton sensor, each ventilation unit regulates the air
exchange on the basis of its own measured values.
— The ventilation unit starts the most recently selected ventilation program in the following
situations:
— after a power cut
— when the switched off ventilation unit is switched on again at the mains switch.
9.2 Set ventilation unit to Standby mode
►Hold down the button for the “Reduced ventilation” program on the InControl pushbutton
sensor (see section 10.1 on page 21) for at least 3 seconds to switch from Ventilation
mode to Standby mode.
This triggers the following actions:
— The current ventilation mode is ended.
— The ventilation unit continues to be supplied with power.
— Closetheairaps.
►Press any button on the InControl pushbutton sensor or press the stepping switch for three
power levels (see section 7.1 on page 17) to switch from Standby to Ventilation mode.
NOTE
— It is not a good idea to leave the ventilation unit in Standby mode for long periods (see
„Rules for correct usage“ on page 15).
— Standby mode is disabled at the factory in association with the “Mains switch without func-
tion” option, type: M-WRG-O/NOF.
9.3 Frost protection function
The ventilation unit is equipped with a frost protection function. In low outdoor temperatures, the
ventilation unit automatically switches to frost protection mode.
►Do not switch the ventilation unit off in the winter. Note section „6 Rules for correct usage“
on page 15.
How it works (extract from the national technical approval Z-51.3-138):
Topreventtheheatexchangerfromicingup,thereisatemperaturesensorttedontheexhaust
air side for constantly monitoring the temperature. If the exhaust air temperature drops below 2 °C,
themotorcontrollergraduallychangesthesupplyairand/orextractairvolumeowaccordingto
the fan level so that the proportion of extract air is increased. This causes the temperature to rise