Meltem M-WRG-II P-M 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 AND INSTALLATION INSTRUCTIONS
HOME VENTILATION WITH HEAT RECOVERY
Ventilation units
M-WRG-II P-M (-F, -FC)
M-WRG-II E-M (-F, -FC)
Part no. 744009EN Week 32/2020 EN
Modbus RTU
Master

Operating and installation instructions
M-WRG-II P-M (-F, -FC), M-WRG-II E-M (-F, -FC) ventilation units
- 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 these operating and installation instructions ................................................... 5
1.2 Description ...................................................................................................................... 5
1.3 Target group .................................................................................................................... 6
1.4 EU declaration of conformity ........................................................................................... 7
1.5 National technical approval (for Germany) ..................................................................... 7
1.6 Nameplate ...................................................................................................................... 7
1.7 Technical data ................................................................................................................. 8
1.7.1 Electrical connection ....................................................................................................... 8
1.7.2 Dimensions and weight ................................................................................................... 8
1.7.3 Noise emission ............................................................................................................... 8
1.7.4 Unit properties ................................................................................................................ 8
1.7.5 Unit features ................................................................................................................... 9
1.7.6 Airlters ........................................................................................................................ 10
1.8 Storage ......................................................................................................................... 10
1.9 Environmentally-friendly disposal ................................................................................. 10
1.10 Revision index .............................................................................................................. 10
1.11 Explanation of the symbols used .................................................................................. 10
1.12 Supplementary documents ........................................................................................... 10
2 Safety instructions ...................................................................................................... 11
2.1 Hazardclassication ...................................................................................................... 11
2.2 Notes on using the ventilation units safely ..................................................................... 11
2.2.1 Fire protection ................................................................................................................ 11
2.2.2 Operationwithreplaces ............................................................................................... 11
2.2.3 Installation in wet areas ................................................................................................ 12
2.2.4 Condensate drain ......................................................................................................... 12
2.2.5 Starting and using the ventilation unit ........................................................................... 12
2.3 Notes on using the ventilation units .............................................................................. 12
2.4 Note on use in conjunction with room air conditioners ................................................. 13
2.5 Intended use ................................................................................................................. 13
3 Warranty and liability .................................................................................................. 14
3.1 Warranty ....................................................................................................................... 14
3.2 Liability .......................................................................................................................... 14
4 Dimensions ................................................................................................................. 15
4.1 Ventilation unit without duct adapters ........................................................................... 15
4.2 Ventilation unit with duct adapters ................................................................................ 16
5 Structure and function ............................................................................................... 17
5.1 Overview of the modules .............................................................................................. 17
5.1.1 Ventilation unit – with cover attached ........................................................................... 17
5.1.2 Ventilation unit – with cover removed ........................................................................... 17
5.2 Description of the functions .......................................................................................... 18
5.2.1 How the M-WRG-II ventilation unit works ..................................................................... 18
5.2.2 Howthecross-counterowplateheatexchangerworks/moisturerecoverywith
enthalpy heat exchanger .............................................................................................. 19

Operating and installation instructions
M-WRG-II P-M (-F, -FC), M-WRG-II E-M (-F, -FC) ventilation units
- 3 -
Meltem Wärmerückgewinnung GmbH & Co. KG
Am Hartholz 4 · D-82239 Alling
[email protected] · www.meltem.com
VENTILATION THE RIGHT WAY
VENTILATION & HEAT RECOVERY
6 Rules for correct usage .............................................................................................. 20
6.1 General ......................................................................................................................... 20
6.2 Seasonal operation ....................................................................................................... 20
6.2.1 Operation at cold times of year ..................................................................................... 20
6.2.2 Summer mode .............................................................................................................. 21
6.3 Airlters ........................................................................................................................ 21
7 Central and local operation of the ventilation unit .................................................. 22
7.1 Operation via the Modbus RTU master ........................................................................ 22
7.2 Controls and indicators on the ventilation unit .............................................................. 22
7.3 Default assignment of the membrane touch pad .......................................................... 23
7.3.1 M-WRG-II P-M / M-WRG-II E-M ................................................................................... 23
7.3.2 M-WRG-II P-M-F / M-WRG-II E-M-F ............................................................................. 23
7.3.3 M-WRG-II P-M-FC / M-WRG-II E-M-FC ....................................................................... 23
7.4 LED indicators .............................................................................................................. 24
7.4.1 Selected ventilation program indicator .......................................................................... 24
7.4.2 Status indicators ........................................................................................................... 24
8 Starting up ................................................................................................................... 24
8.1 Checkingtheventilationunitbeforeswitchingonforthersttime ............................... 24
8.2 Switching on the ventilation unit ................................................................................... 24
9 Operating the ventilation unit .................................................................................... 25
9.1 Central operation .......................................................................................................... 25
9.2 Local operation ............................................................................................................. 25
9.3 Frost protection function ............................................................................................... 25
10 Ventilation levels/programs ....................................................................................... 26
10.1 “Reduced ventilation (people absent)” .......................................................................... 26
10.2 “Normal ventilation (people present)” ........................................................................... 26
10.3 “Increased ventilation” .................................................................................................. 26
10.4 “Intensive ventilation (temporary 15 min)” .................................................................... 26
10.5 “Humidity control” .......................................................................................................... 27
10.6 “Automatic mode” ......................................................................................................... 27
11 Options for ventilation mode ..................................................................................... 28
11.1 External control input .................................................................................................... 28
11.1.1 Description .................................................................................................................... 28
11.1.2 Factory defaults and possible adjustment ranges ........................................................ 28
11.1.3 M-WRG-II O/EST-1, part no. 721005, and M-WRG-II O/EST-2, part no. 721006 ........ 28
11.2 Minimum ventilation to DIN 18017-3, M-WRG-II O/MVS, part no. 721001 ................... 29
11.3 VOC sensor for monitoring the outdoor air quality, M-WRG-II O/VOC-AUL,
part no. 721002 ............................................................................................................. 29
11.4 “Unit OFF” input, M-WRG-II O/EGG-AUS, part no. 721003 ......................................... 29
11.5 Mains switch without function, M-WRG-II O/NOF, part no. 721004 .............................. 29
11.6 Ventilation for moisture protection, M-WRG-II O/LFS, part no. 721007 ........................ 30
11.6.1 Description .................................................................................................................... 30
11.6.2 Factory defaults ............................................................................................................ 30
12 Filter maintenance ...................................................................................................... 31
12.1 Choiceoflter ............................................................................................................... 31
12.2 Orderinglters .............................................................................................................. 31

Operating and installation instructions
M-WRG-II P-M (-F, -FC), M-WRG-II E-M (-F, -FC) ventilation units
- 4 -
Meltem Wärmerückgewinnung GmbH & Co. KG
Am Hartholz 4 · D-82239 Alling
[email protected] · www.meltem.com
VENTILATION THE RIGHT WAY
VENTILATION & HEAT RECOVERY
12.3 Changingtheairlters .................................................................................................. 32
12.3.1 Removing the cover from the ventilation unit ................................................................ 32
12.3.2 Removingtheextractairlter ....................................................................................... 32
12.3.3 Removingtheoutdoorairlter ...................................................................................... 33
12.3.4 Insertingthenewextractairlter .................................................................................. 33
12.3.5 Insertingthenewoutdoorairlter ................................................................................ 34
12.3.6 Attaching the unit cover to the ventilation unit .............................................................. 34
12.3.7 Resettingthelterchangeindicator ............................................................................. 35
13 Cleaning ....................................................................................................................... 35
14 Troubleshooting .......................................................................................................... 36
15 Connecting the ventilation unit to the Modbus RTU ............................................... 37
15.1 Overview of the modules .............................................................................................. 37
15.1.1 Modbus board in the ventilation unit ............................................................................. 37
15.1.2 Bus cable ...................................................................................................................... 38
15.2 Tools and equipment required ...................................................................................... 38
15.3 Codes for designation of wire colours ........................................................................... 38
15.4 Accessing the Modbus board in the ventilation unit ...................................................... 39
15.4.1 Switchingo󰀨powertotheventilationunit ..................................................................... 39
15.4.2 Removing the cover from the ventilation unit ................................................................ 39
15.4.3 Removing the electronics compartment cover plate ..................................................... 40
15.5 Overview drawings ....................................................................................................... 40
15.5.1 Modbus wiring diagram ................................................................................................. 40
15.5.2 Exampleofoor-by-oorwiring .................................................................................... 41
15.6 Electrical installation ..................................................................................................... 42
15.7 Addressing the Modbus boards .................................................................................... 42
15.8 Final tasks ..................................................................................................................... 42
16 Modbusconguration ................................................................................................ 43
16.1 Default settings ............................................................................................................. 43
16.2 Function codes ............................................................................................................. 43
16.3 Frame requirements ..................................................................................................... 43
16.4 Setting and addressing ................................................................................................. 43
16.5 Register ........................................................................................................................ 43
16.6 Sensorsinthedi󰀨erentventilationunittypes ............................................................... 45
16.7 Setting the ventilation level ........................................................................................... 45
16.7.1 Balanced ....................................................................................................................... 45
16.7.2 Unbalanced ................................................................................................................... 46
17 Integrating into other bus systems ........................................................................... 46
17.1 KNX .............................................................................................................................. 46
17.2 Loxone .......................................................................................................................... 47
17.3 Other bus systems ........................................................................................................ 47

Operating and installation instructions
M-WRG-II P-M (-F, -FC), M-WRG-II E-M (-F, -FC) ventilation units
- 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 these operating and installation instructions
These original operating and installation instructions contain important information
that should be followed when setting up and using the M-WRG-II P-M (-F, -FC) and
M-WRG-II E-M (-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
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 section “2 Safety instructions” on page 11 carefully.
1.2 Description
These instructions describe how to set
up and operate the decentralised venti-
lation units M-WRG-II P-M (-F, -FC) and
M-WRG-II E-M (-F, -FC) (see Fig. 1).
They also explain how to connect the
ventilation unit electrically to the Modbus
and how to control it using the Modbus
protocol.
M-WRG stands for Meltem heat
recovery. Home ventilation expertise
extending back nearly 40 years has
been incorporated into this product from
Meltem Wärmerückgewinnung.
Using windows for ventilation, particu-
larly during periods of cold weather, is
now a thing of the past. This ventilation
unit brings in outdoor air fully automat-
ically, and heats it by recovering heat
from the air that is extracted. Outdoor
air and extract air are routed in sepa-
rateductsthroughacross-counterowplateheatexchanger(seesection5.2.2on
page 19). You save on heating costs, increase your living comfort and are kind to the
environment by reducing CO2emissions.Anairlteralsoremovesrespirableparticulates
such as pollen, soot and bacteria from dust class PM1 from the outdoor air. It is also
possible to monitor the outdoor air quality with a VOC sensor; if the air load is high (e.g.
Fig. 1: M-WRG-II P-M / M-WRG-II E-M ventilation unit

Operating and installation instructions
M-WRG-II P-M (-F, -FC), M-WRG-II E-M (-F, -FC) ventilation units
- 6 -
Meltem Wärmerückgewinnung GmbH & Co. KG
Am Hartholz 4 · D-82239 Alling
[email protected] · www.meltem.com
VENTILATION THE RIGHT WAY
VENTILATION & HEAT RECOVERY
duetobiologicaldecayanddecompositionprocesses,motortra󰀩cexhaustfumesor
volatile by-products from industrial and commercial operations) the proportion of supply
air can be reduced temporarily until the available outdoor air quality has improved (only
for units with a CO2sensor,specicallyM-WRG-II...-FCunits).
The ventilation units are designed to run continuously and can be equipped with sensors
fordemand-controlledventilation.Theycanbesurface-mounted,ush-mountedorinte-
grated into the wall (U2). The ventilation units are low-maintenance, but regularairlter
changes are important.
The5buttonsonthemembranetouchpadonthesideoftheunitareusedtosetdi󰀨erent
ventilation levels / programs and a time-limited intensive ventilation program. It therefore
allowsyoutoadapttheairowtoyourneeds.
Beside each button is an LED that displays the active ventilation program and further
informationabouttheunit’sstatus(airlterchange,fault,etc.).
The ventilation unit also has a Modbus board that allows it to be controlled centrally using
the Modbus RTU protocol. The customer must have a Modbus RTU master in order to do
this. Additional interfaces allow the units to be connected to other bus systems, such as
KNX or Loxone.
The ventilation units from the M-WRG-II P and M-WRG-II E series are equipped with heat
exchangersthatworkonthecross-counterowprinciple.M-WRG-IIEalsohasafunction
for recovering moisture from the extract air (enthalpy heat exchanger).
The M-WRG-II P-F and M-WRG-II E-F ventilation units have various ventilation levels /
programs, including a humidity control. The M-WRG-II P-FC and M-WRG-II E-FC units
have an automatic mode (humidity and CO2control). The CO2value is the most impor-
tant measurement for assessing the air quality. A microprocessor integrated into the unit
calculates the optimum air renewal from the values measured by the relative humidity and
CO2sensors and sets the correct ventilation level fully automatically.
1.3 Target group
These operating and installation instructions are aimed at two target groups:
— Chapters “1 Introduction” to “14 Troubleshooting” are intended for users of the ventila-
tion unit. No special prior knowledge is needed.
— The activities described in chapter “15 Connecting the ventilation unit to the Modbus
RTU”,chapter“16Modbusconguration”andchapter“17Integratingintootherbus
systems”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

Operating and installation instructions
M-WRG-II P-M (-F, -FC), M-WRG-II E-M (-F, -FC) ventilation units
- 7 -
Meltem Wärmerückgewinnung GmbH & Co. KG
Am Hartholz 4 · D-82239 Alling
[email protected] · www.meltem.com
VENTILATION THE RIGHT WAY
VENTILATION & HEAT RECOVERY
1.4 EU declaration of conformity
The ventilation units from the M-WRG-II P and M-WRG-II E series manufactured by
Meltem Wärmerückgewinnung GmbH & Co. KG
Am Hartholz 4
D-82239 Alling
conform to the regulations and standards listed in the EU Declaration of Conformity
provided.
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 installed in Germany. This
approval can be provided upon request or can be downloaded from our website at
www.meltem.com/waermerueckgewinnung/downloads/ (see also the QR code on the
back page of these instructions). The approval number is Z-51.3-431 (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).
Fig. 2: Nameplate
Fig. 3: Position of the nameplate
1
2

Operating and installation instructions
M-WRG-II P-M (-F, -FC), M-WRG-II E-M (-F, -FC) ventilation units
- 8 -
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 Technical data
1.7.1 Electrical connection
Unit types M-WRG-II P-M /
M-WRG-II E-M
M-WRG-II P-M (-F, -FC) /
M-WRG-II E-M (-F, -FC)
Operating voltage 230 V AC
(working voltage range: 85 V AC to 265 V AC)
Mains frequency 50 to 60 Hz
Power consumption 4.6 to 52.4 W / 4.4 to 53.4 W
Standby power consumption 0.8 W
Maximum current consumption 0.42 A
IP code IPX4
IPX5 with Integrated into wall U²
installation version
Energye󰀩ciencyclass(ErP) B A
1.7.2 Dimensions and weight
Unit dimensions excluding air connectors,
see also section 4 on page 15
364 x 590 x 218 mm (W x H x D)
Visible unit depth when surface-mounted 218 mm
Visibleunitdepthwhenush-mounted 58 mm
Visible unit depth when integrated into wall -
Outdoor air/exhaust air connectors DN 100
Weight Approx. 8.3 kg
1.7.3 Noise emission
Sound pressure level LP,A surface-mount 11.6 to 48.1 dB(A)/Aeq 10 m2
Sound pressure level LP,Aush-mountor
with ductwork connection on extract air side
12.3 to 47.5 dB(A)/Aeq 10 m2or
12.3 to 46.4 dB(A)/Aeq 10 m2
Sound pressure level LP,A integrated into wall U2
with ductwork connection on extract air side
8.4 to 42.6 dB(A)/Aeq 10 m2
Sound insulation Dn,e,w unit in use
depending on installation version
51 to 70 dB
1.7.4 Unit properties
Unit types M-WRG-II P-M /
M-WRG-II E-M
M-WRG-II P-M (-F, -FC) /
M-WRG-II E-M (-F, -FC)
Type of system Decentralised, heat recuperation
Airow 10 to 100 m3/h
Heatrecoverye󰀩ciency(max.),
DIN EN 13141-8
Up to 94 % / 91 %

Operating and installation instructions
M-WRG-II P-M (-F, -FC), M-WRG-II E-M (-F, -FC) ventilation units
- 9 -
Meltem Wärmerückgewinnung GmbH & Co. KG
Am Hartholz 4 · D-82239 Alling
[email protected] · www.meltem.com
VENTILATION THE RIGHT WAY
VENTILATION & HEAT RECOVERY
Unit types M-WRG-II P-M /
M-WRG-II E-M
M-WRG-II P-M (-F, -FC) /
M-WRG-II E-M (-F, -FC)
Colour White similar to RAL 9010
TÜV-tested Yes
Hygiene tested for conformity
with VDI 6022 sheet 1
W-304132-18-WD
Passivhauscerticate(PHI) 1327vs03 / 1328vs03
National technical approval (DIBt) Z-51.3-431
1.7.5 Unit features
Unit types M-WRG-II P-M /
M-WRG-II E-M
M-WRG-II P-M (-F, -FC) /
M-WRG-II E-M (-F, -FC)
Output control Centrally via Modbus (10 levels),
locally using the unit’s membrane touch pad
(5 levels)
Interface for connecting to the
Modbus
Yes, Modbus RTU
Supply air / exhaust air fan EC direct current radial fan
Heat exchanger Cross-counterowplateheatexchanger,on
M-WRG-II E-M (-F, -FC) with enthalpy
Filtermonitoringwithlterchange
indicator
Runtime-controlled, visual
Condensate drain Via condensate connection / not required*
Fullyautomaticcoverapcontrol
whenswitchingOn/O󰀨,in
Standby mode and if the power
fails
Yes
Frost protection function Yes
“Unit OFF” input (smoke detector,
window contact)
Optional
Fault indicator output Optional
Operating hours display Via optional accessories such as the mobile oper-
ating hours reader M-WRG-ALGH or wireless
remote control M-WRG-FBH
Humidity control No Yes
CO2control / automatic mode
(humidity and CO2control)
No With -M-FC units
Filter type Roundltercartridgesforoutdoorairandextractair
* Intended usage as described in operating instructions, not exposed to excessive humidity

Operating and installation instructions
M-WRG-II P-M (-F, -FC), M-WRG-II E-M (-F, -FC) ventilation units
- 10 -
Meltem Wärmerückgewinnung GmbH & Co. KG
Am Hartholz 4 · D-82239 Alling
[email protected] · www.meltem.com
VENTILATION THE RIGHT WAY
VENTILATION & HEAT RECOVERY
1.7.6 Airlters
Designation Filter class
Outdoorairlter ISO ePM1 60% (F7)
Activatedcharcoallterforoutdoorair(optional) ISO ePM2,5 55% (F7)
Extractairlter ISO Coarse 60% (G4)
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.
1.9 Environmentally-friendly disposal
The ventilation units must not be disposed of in the residual waste bin.
►Dispose of the ventilation unit in accordance with the waste disposal regulations that
apply on site.
1.10 Revision index
Edition Manual Date
2nd edition Operating and installation instructions
for M-WRG-II P-M (-F, -FC) and
M-WRG-II E-M (-F, -FC) ventilation units
Week 32/2020 EN
1.11 Explanation of the symbols used
►This symbol indicates an action to be taken.
— This symbol indicates a list.
1.12 Supplementary documents
Manual Part no.
Installationmanualforush-mountinstallationkitwithplasteringtrim
(solid construction) M-WRG-II M/MB
744001EN
Installationmanualforush-mountinstallationkitM-WRG-IIM
(frame construction)
744002EN
Installationmanualforush-mountinstallationkitM-WRG-IIM-U2744003EN
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

Operating and installation instructions
M-WRG-II P-M (-F, -FC), M-WRG-II E-M (-F, -FC) ventilation units
- 11 -
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.
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.

Operating and installation instructions
M-WRG-II P-M (-F, -FC), M-WRG-II E-M (-F, -FC) ventilation units
- 12 -
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 installation manuals for installation kits and ventilation units in section 1.12 on
page 10).
— 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 13) and chapter “6 Rules for correct usage” on page 20.
— 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operatetheventilationunitwiththeairlterstted.
— 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.

Operating and installation instructions
M-WRG-II P-M (-F, -FC), M-WRG-II E-M (-F, -FC) ventilation units
- 13 -
Meltem Wärmerückgewinnung GmbH & Co. KG
Am Hartholz 4 · D-82239 Alling
[email protected] · www.meltem.com
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.

Operating and installation instructions
M-WRG-II P-M (-F, -FC), M-WRG-II E-M (-F, -FC) ventilation units
- 14 -
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.
— 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.
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.
— 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.

Operating and installation instructions
M-WRG-II P-M (-F, -FC), M-WRG-II E-M (-F, -FC) ventilation units
- 15 -
Meltem Wärmerückgewinnung GmbH & Co. KG
Am Hartholz 4 · D-82239 Alling
[email protected] · www.meltem.com
VENTILATION THE RIGHT WAY
VENTILATION & HEAT RECOVERY
4 Dimensions
4.1 Ventilation unit without duct adapters
Fig. 4: M-WRG-II ventilation unit without duct adapters, dimensions in millimetres
40
364
590
58
160
218
125
210
194,5
149

Operating and installation instructions
M-WRG-II P-M (-F, -FC), M-WRG-II E-M (-F, -FC) ventilation units
- 16 -
Meltem Wärmerückgewinnung GmbH & Co. KG
Am Hartholz 4 · D-82239 Alling
[email protected] · www.meltem.com
VENTILATION THE RIGHT WAY
VENTILATION & HEAT RECOVERY
4.2 Ventilation unit with duct adapters
Fig. 5: M-WRG-II ventilation unit with duct adapters, dimensions in millimetres
40
218
364
610
590
58
160
208,5
125
210
194,5
149

Operating and installation instructions
M-WRG-II P-M (-F, -FC), M-WRG-II E-M (-F, -FC) ventilation units
- 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 Structure and function
5.1 Overview of the modules
5.1.1 Ventilation unit – with cover attached
Item in Fig. 6 Designation
1 Housing
2 Unit cover
3 Membrane touch pad with 5 buttons for selecting the ventilation
levels / programs and 5 status indicator LEDs
5.1.2 Ventilation unit – with cover removed
Item in Fig. 7 Designation
1 Supply air grille
2Outdoorairlterwithltercover
3Mainsswitch“On/O󰀨”
4Extractairlterwithlterring
5 Extract air grille
Fig. 6: Ventilation unit – with cover attached
1
2
3
Fig. 7: Ventilation unit – with cover removed
1
3
2
4
5

Operating and installation instructions
M-WRG-II P-M (-F, -FC), M-WRG-II E-M (-F, -FC) ventilation units
- 18 -
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-II ventilation unit works
1
2
3
4
5
6
Fig. 8: How the ventilation unit works Fig. 9: Components for air exchange
1
2
3
4
5
Item in
Fig. 8
Designation Item in
Fig. 9
Designation
1 M-WRG-II ventilation unit 1 Extractairlter
2 Supply air 2 Supply air fan
3 Extract air 3 Cross-counterowplateheat
exchanger
4 Outdoor air 4 Exhaust air fan
5 Exhaust air 5 Outdoorairlter
6 Outer wall terminal
The ventilation unit operates continuously, transports outdoor air and extract air at the
sametimeandguidesandlterstheoutdoorairandextractairseparately.Theself-reg-
ulatingfans(whichensureaconstantvolumetricowrate)arearrangedonthesupply
air and exhaust air sides. The supply air fan (item 2 in Fig. 9) transports outdoor air
(item4inFig.8)throughtheoutdoorairlter(item5inFig.9)andcross-counterow
plate heat exchanger (item 3 in Fig. 9) into the interior as supply air (item 2 in Fig. 8).
The exhaust 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-counterowplateheatexchangerandcarriedoutsideasexhaustair(item5in
Fig. 8). The supply air and exhaust air fans each transport the same volume of air. The
pressure in the interior remains practically constant.

Operating and installation instructions
M-WRG-II P-M (-F, -FC), M-WRG-II E-M (-F, -FC) ventilation units
- 19 -
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-counterowplateheatexchangerworks/moisturerecovery
with enthalpy heat exchanger
1
2 3
45
Fig. 10: Howthecross-counterowplateheat
exchanger works
Fig. 11: Moisture recovery with enthalpy heat
exchanger
Water molecules Contamination (microbes, bacteria, mould fungi)
Warm, moist
extract air Supply air
Cold, dry
outdoor air
Exhaust air
Thechannelsonthecross-counterowplateheatexchanger(item1inFig.10)are
designedsothattheairowsmoveinoppositedirections.Thisguaranteesthegreatest
possible exchange of thermal energy.
In the winter, the highly thermally conductive plates transfer the heat from the extract air
ow(item2inFig.10)tothesupplyairow(item3inFig.10).Thecooledextractairis
carried to the outside as exhaust air (item 4 in Fig. 10). In the summer, this is reversed;
the warmer, incoming air is cooled.
Ventilation units from the M-WRG-II E series also incorporate a moisture recovery
(enthalpy) function (see Fig. 11). An enthalpy exchanger works on the principle of
osmosis; the water molecules pass through the pore structure of an antimicrobial polymer
membrane, driven by the moisture’s concentration gradient from the warm air to the cold
airside.Themembranelmactsasaseparatinglayerfortheairowsandguarantees
thatonlywatervapourfromthetwoairowsadjacenttothemembraneistransferred.
Microbes, mould fungi and bacteria are unable to penetrate and settle in the membrane
due to their relatively large size compared to water molecules. The innovative polymer
membranethatmakesthispossibleishygiene-certiedtoVDI6022.Theenthalpyheat
exchangere󰀨ectivelypreventstheairwebreathebeingtoodryinthewinterandprevents
excessive atmospheric humidity in the summer. This combination of heat and hygienic
moisture recovery saves on heating costs and protects the respiratory tract.

Operating and installation instructions
M-WRG-II P-M (-F, -FC), M-WRG-II E-M (-F, -FC) ventilation units
- 20 -
Meltem Wärmerückgewinnung GmbH & Co. KG
Am Hartholz 4 · D-82239 Alling
[email protected] · www.meltem.com
VENTILATION THE RIGHT WAY
VENTILATION & HEAT RECOVERY
6 Rules for correct usage
6.1 General
►Always operate the ventilation unit with the unit cover attached.
►Run the ventilation unit in continuous mode or demand-controlled with humidity and/
or CO2control (only possible if the unit contains the appropriate sensors). While
continuous mode constantly ensures a good and healthy atmosphere in the room,
demand-controlledventilationusessensorstoprovideparticularlyenergy-e󰀩cient
ventilation that is tailored precisely to requirements.
► 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 Seasonal operation
6.2.1 Operation at cold times of year
►During cold times of year, run the ventilation unit either in continuous mode or
demand-controlled via the humidity or CO2sensors (only if the unit has the appro-
priate sensors).
— Energy-saving motors and an innovative controller ensure a very low power
consumption, even in continuous mode.
— Continuous removal of moisture from the interior is only guaranteed while the unit
is in operation.
►Run the intensive ventilation program in the following cases:
— regularly if there is high atmospheric humidity in the interior
— ifyouneedtoswitcho󰀨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 0 °C. Otherwise the ventilation unit will constantly activate the frost protection
functionorswitcho󰀨altogether.Thehighertheinteriortemperature,thebiggerthe
bu󰀨erforoperatingtheventilationunitandforheatrecovery.
NOTICE
Supply air or exhaust air operation alone is not recommended. Firstly because the unit
is often in the unbalanced frost protection mode and secondly because the incoming
owofcoldoutdooraircausestheroomstocooldown.