Meltem M-WRG/ZNH-F User manual

M-WRG User manual
1
Meltem Wärmerückgewinnung GmbH & Co.KG
Am Hartholz 4 D-82239 Alling [e-mail] www.meltem.com
Order Nr. 5302-02-01 06/2011
HOME VENTILATION WITH HEAT RECOVERY
Ventilation Units
M-WRG/ZNH-F
M-WRG/ZNH-FC
M-WRG/LCD-F
M-WRG/LCD-FC

M-WRG/ZNH-F (-FC) User manual
M-WRG/LCD-F (-FC)
- 2 -
Meltem Wärmerückgewinnung GmbH & Co.KG
Am Hartholz 4 D-82239 Alling [e-mail] www.meltem.com
Important user information
Ventilation with heat recovery
With the decentralized ventilation system M-WRG with
heat recovery from Meltem you have acquired a high
quality product. This ventilation system serves you as
an improvement for your home and your health as well
as a protective measure against moisture and mold
damages in your home.
Ventilation by opening windows, especially during cold
seasons, belongs to the past. From now on, fresh and
filtered air is supplied fully automated. The stale air is
extracted and its warmth transferred to the fresh air,
via the heat exchanger. While doing so, the M-WRG
ventilation units have minimum power consumption.
You save heating costs, increase the comfort of your
home and at the same time reduce the impact on the
environment by reducing CO2 emissions.
Of course you still may open your windows -
especially during warmer days.
A family of four produces daily an average of 10-14
liters of moisture, due to cooking, laundry, personal
hygiene, and breathing of inhabitants, plants and
animals! This excessive amount of moisture, within
the interior air, is extracted through the M-WRG
ventilation unit and therefore prevents the forming of
mold and resulting damages in the building structure.
At the same time, fumes from floors, furniture and a
too high CO2 concentration in the air, which can lead
to fatigue and health issues, will be extracted from the
interior rooms and replaced by fresh and clean air.
Directions for correct usage
Please read this manual carefully and follow the
instructions contained in this manual. Additionally,
familiarize yourself with the operations of the M-WRG
ventilation unit, as well as please pay attention to the
warnings and cautions contained in this manual.
•Never operate the M-WRG ventilation unit without
filters. Only with the original filters from Meltem,
the units will remain clean, fully operative, and
have a long lifespan.
•The M-WRG ventilation unit may only be operated
once installed correctly.
•When ventilating basements or similar rooms we
advise to be cautious (especially during the
summer season and warm weather), due to the
fact that the moisture in the air will condense on
cold interior walls and - despite ventilation -
moisture damages can occur. Therefore, please
only ventilate at night during warm weather
seasons! If you would like to ventilate such rooms
with an M-WRG ventilation system, please consult
with the manufacturer prior to purchase.
•Never cover the M-WRG ventilation unit or any part
of it with e.g. cabinets, blinds or curtains. A
minimum distance of 30 cm to any furniture is
required, in order for the M-WRG ventilation unit to
remain fully operable.
•The M-WRG ventilation unit has been designed for
continuous operation and a long lifespan. During
cold seasons, the M-WRG ventilation unit should
be operated continuously. The energy saving
motors and innovative electronics guarantee –
despite continuous operation- for a low power
consumption (approx. 3.8 Watt at level 1). Only a
continuous operation achieves a permanent
extraction of moisture and condensation. If this
does not occur, it is possible that condensate will
gather in the unit.
•If a high concentration of moisture occurs, we
recommend regularly ventilating the room at the
highest ventilation level for 10 minutes, in order to
eliminate any possible condensation inside the
unit.
•In order to guarantee a smooth operation,
especially during low exterior temperatures
(below -5°C), you should avoid interior
temperatures below 15°C.
Caution: In case of exterior temperatures below
0°C, icicles may form at the façade covers. These
should be removed for safety purposes.
Maintenance and Filter replacement
The unit automatically monitors the filter status. An
acoustic warning signal will inform you, when the
filters need to be replaced.
However, for hygienic reasons, it is strongly
recommended to replace the filters at least once
per year, ideally before the heating season.
For a reliable operation of the units and for your
own safety, only original and certified parts from
Meltem should be used. Otherwise this may void
the warranty and Meltem will not be liable for any
damages.
We hope you will enjoy your new M-WRG home
ventilation system with heat recovery!

M-WRG/ZNH-F (-FC) User manual
M-WRG/LCD-F (-FC)
- 3 -
Meltem Wärmerückgewinnung GmbH & Co.KG
Am Hartholz 4 D-82239 Alling [e-mail] www.meltem.com
Contents
1. You have made the right choice!..................................................................................................................- 4 -
1.1 Safety instructions ............................................................................................................................................ - 4 -
1.2 How does the M-WRG ventilation unit work? ................................................................................................. - -
1.3 M-WRG ventilation unit overview.................................................................................................................... - 6 -
2. Start up and operation ................................................................................................................................- 7 -
2.1 Display overview............................................................................................................................................... - 7 -
2.2 Control buttons................................................................................................................................................. - 7 -
3. Programs ....................................................................................................................................................- 8 -
3.1 Program overview............................................................................................................................................. - 8 -
3.2 Continuous ventilation program P1.................................................................................................................. - 8 -
3.2.1 Boost ventilation ......................................................................................................................................... - 9 -
3.3 Cross ventilation with two units programs P2 and P3.................................................................................... - 10 -
3.4 Humidity regulation program P4.................................................................................................................... - 12 -
3. Temperature program P ............................................................................................................................... - 13 -
3.5.1 Temperature program Summer (Su)........................................................................................................ - 14 -
3.5.2 Temperature program Automated Heating (HA)...................................................................................... - 15 -
3.5.3 Temperature program Constant Temperature (Hc) .................................................................................- 16 -
3.6 Air quality regulation program P6 .................................................................................................................. - 17 -
4. Filter replacement..................................................................................................................................... - 18 -
4.1 Filter selection ................................................................................................................................................ - 18 -
4.2 Replace filters ................................................................................................................................................. - 18 -
4.2.1 Remove unit cover.................................................................................................................................... - 18 -
4.2.2 Remove old filters..................................................................................................................................... - 19 -
4.2.3 Insert new filters ....................................................................................................................................... - 19 -
4.2.4 Close unit cover........................................................................................................................................ - 19 -
. Trouble shooting....................................................................................................................................... - 20 -
6. Antifreeze protection................................................................................................................................ - 20 -
7. Cleaning the M-WRG ventilation unit.........................................................................................................- 20 -
8. Technical data........................................................................................................................................... - 21 -
9. Program overview.....................................................................................................................................- 22 -

M-WRG/ZNH-F (-FC) User manual
M-WRG/LCD-F (-FC)
- 4 -
Meltem Wärmerückgewinnung GmbH & Co.KG
Am Hartholz 4 D-82239 Alling [e-mail] www.meltem.com
1. You have made the right choice!
With the M-WRG decentralized ventilation unit with heat recovery,you acquired a high quality product. M-WRG
stands for Meltem – heat recovery – with comfort. Meltem‘s „know how“ of more than 30 years, developing and
producing decentralized ventilation systems, is now combined with their innovate heat recovery process. Ventilation
by opening windows especially during cold seasons, belong to the past. From now on, fresh and filtered air is
supplied fully automated. The stale air is extracted and its warmth transferred to the fresh air, via the heat exchanger.
While doing so, the M-WRG units have minimum power consumption. You save heating costs, increase the comfort
of your home and at the same time reduce the impact on the environment by reducing CO2 emissions.
The M-WRG ventilation unit has been designed for continuous operation. We guarantee an effective operation as
well as a long lifespan of the system if it is correctly used. We hope you will enjoy your new M-WRG home ventilation
system with heat recovery!
1.1 Safety instructions
•The M-WRG ventilation unit may only be operated once installed correctly.
•For correct installation of the system please follow the instructions of the assembly manual.
•The M-WRG ventilation unit may only be used for the ventilation of living space and interior rooms (Kitchens,
bathrooms, basements, offices, etc). With rooms that have an excessive build up of dust and/or corrosive
gas emissions, the M-WRG ventilation unit may be limited and/or damaged in its operating capacity.
•Please familiarize yourself with the operating modes and procedures of the M-WRG ventilation unit.
•The M-WRG ventilation unit is especially suitable for the drying phase after a building is constructed and the
inhabitants have moved in. It is not suitable for drying a building during construction or to ventilate a building
while interior renovations are in progress. A continuously high concentration of dust and/or moisture will clog
the filters additionally and overwork the automated extraction of condensate.
•Never operate the M-WRG ventilation unit without the suitable filters. The filters protect your health and living
space from exterior environmental influences. Only with the suitable filters, the M-WRG ventilation unit will
remain clean. Additionally it will prevent the pollution of the electrical components and the heat converter, as
well as reduce or prevent full operating capacity of the M-WRG ventilation unit.
•Do not install the M-WRG ventilation unit into the interior of a cabinet or other furniture. Do not cover the M-
WRG ventilation unit with any type of fabric (towel, curtains, etc.) or any other objects (furniture, blinds, etc.).
•Please follow the instructions contained in this user manual.
•Please follow the maintenance instructions contained in this user manual.
•Important Indication according to DIN EN 60335: This M-WRG ventilation unit is not to be operated by
persons (including children) with limited physical, sensory or mental capabilities, or lack of experience and/or
lack of knowledge. Except if they are supervised, or were given instructions how to use the M-WRG
ventilation unit by a legal guardian, responsible for their safety. Children should be supervised, in order to
ensure that they are not playing with the M-WRG ventilation unit.
•If these Safety instructions are not regarded, Meltem will not be held liable!
Safety Warning for installing the M-WRG ventilation unit in rooms with open fire places: During the planning
and installation process of the ventilation system, the fireplace safety regulations (i.e.FeuVo) have to be met! Before
operating the M-WRG ventilation unit, the installation has to be discussed and approved by the responsible official
authorities and the chimney sweeper.

M-WRG/ZNH-F (-FC) User manual
M-WRG/LCD-F (-FC)
- 5 -
Meltem Wärmerückgewinnung GmbH & Co.KG
Am Hartholz 4 D-82239 Alling [e-mail] www.meltem.com
1.2 How does the M-WRG ventilation unit work?
The heat exchanger core uses the heat of the
outgoing warm stale air to temper the fresh inflowing
air. The unit has two fans, one fan extracts the warm
stale air from the interior and the other fan draws in
fresh air from the exterior. As the air streams flow
through the air ducts of the heat exchanger core, heat
is transferred from the warm passage to the cold,
while the airstreams are never combined. The cooled
stale air is led out and the pre-tempered fresh air then
streams into the room without causing a draft.
Stale Air Filter
Heat exchanger
Supply Air fan
Supply Air Filter
Stale Air fan
Exterior:
Fresh Air Intake
Exhaust Air Outlet
Interior:
Stale Air Intake
Supply Air Outlet

M-WRG/ZNH-F (-FC) User manual
M-WRG/LCD-F (-FC)
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Meltem Wärmerückgewinnung GmbH & Co.KG
Am Hartholz 4 D-82239 Alling [e-mail] www.meltem.com
1.3 M-WRG ventilation unit overview
Supply Air Outlet
Stale Air Intake
Ring Cover for Stale Air Filter
Cover for Supply Air Filter
Facade Cover: Ventilation Hood
Fresh Air Intake
Exhaust Air Outlet
Cover
Display
Dual switch
-Power switch ON/OFF
-3-level ventilation rate switch

M-WRG/ZNH-F (-FC) User manual
M-WRG/LCD-F (-FC)
- 7 -
Meltem Wärmerückgewinnung GmbH & Co.KG
Am Hartholz 4 D-82239 Alling [e-mail] www.meltem.com
2. Start up and operation
The M-WRG ventilation unit was properly installed, according to the assembly manual, by a certified expert. Please
check that the unit is undamaged and all air ducts are free of any obstructions.
2.1 Display overview
The LCD-Display will show the following symbols and information, depending on the program selected or set up
menu:
2.2 Control buttons
You are able to control and monitor the settings and programs with these buttons:
Thermostat
(Only ZNH unit)
Heating
(Only ZNH unit)
Programs
Stale air
ventilation rate
Supply air
ventilation
rate
Air quality Antifreeze mode
-
Program
menu
- Settings menu
-
Start program
- Save
Change settings

M-WRG/ZNH-F (-FC) User manual
M-WRG/LCD-F (-FC)
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Meltem Wärmerückgewinnung GmbH & Co.KG
Am Hartholz 4 D-82239 Alling [e-mail] www.meltem.com
3. Programs
3.1 Program overview
For a complete program overview, please turn to chapter 8
3.2 Continuous ventilation program P1
The program P1 is designed for a continuous operation with the capability of ventilating your home 24 hours a day.
Start program:
(1) Press the button for 3 seconds to open the program selection menu
(2) Press the button to navigate to program P1
(3) Press the button to start program P1
(4) Press the button to select your preferred ventilation rate
Change settings:
After you have started the program you may change the manufacturer’s preinstalled settings.
(1) Press the button for 3 seconds
(2) Press the button to enter your preferred continuous ventilation rate (du)
(3) Press the button to save your settings
(4) Press the button to be able to change the settings for the boost ventilation rate (in)
(5) Press the button to enter your preferred boost ventilation rate (in)
(6) Press the button to save your settings
(7) Press the button to be able to change the settings for the duration of the boost ventilation (ic)
(8) Press the button to enter your preferred duration of the boost ventilation (ic)
(9) Press the button to save your settings
(10) Press the button for 3 seconds to return to the current operating program display
or
or
or
or
1
3
2
or
4

M-WRG/ZNH-F (-FC) User manual
M-WRG/LCD-F (-FC)
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Meltem Wärmerückgewinnung GmbH & Co.KG
Am Hartholz 4 D-82239 Alling [e-mail] www.meltem.com
3.2.1 Boost ventilation
The program P1 has the additional feature of an intensive ventilation mode (=boost ventilation). The display will show
the remaining ventilation time in minutes. After the countdown is finished, the program will automatically switch back
to the continuous ventilation mode.
Start program:
(1) Repeat steps (1) – (3) as demonstrated above
(2) Press the button for 3 seconds to start the boost ventilation
To change the settings for the ventilation rate and duration of the boost ventilation see chapter 3.2.

M-WRG/ZNH-F (-FC) User manual
M-WRG/LCD-F (-FC)
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Meltem Wärmerückgewinnung GmbH & Co.KG
Am Hartholz 4 D-82239 Alling [e-mail] www.meltem.com
3.3 Cross ventilation with two units programs P2 and P3
Program P2 can be used to supply only fresh air, or program P3 to extract stale air (one way ventilation). In these
modes heat recovery is reduced. These operating modes e.g. are preferable in the summer, to let the cooler air at
night time into your home.
Programs P2 and P3 can also be used to cross ventilate your home by using two ventilation units. One unit will run
program P2 to supply fresh air – the other unit will run program P3 to extract stale air. You are also able to enter
separate ventilation rates for the supply and stale air.
Caution!
•This program should not be operated if outside temperatures are below 10°C.
•Under normal conditions the supply air ventilation rate should be equal to the stale air ventilation rate.
•A ventilation rate of VS: 00 is not possible with this program.
•Please ensure that the connecting or adjacent doors of the two rooms are open or the gap between doorframe
and door is at least 5mm.
Abbreviations Description
VSE Ventilation rate for the
stale air
VSI Ventilation rate for the
supply air
VS Ventilation rate for the
Pause interval
ON Start time
TIME Duration of the operating
interval
Start program:
(1) Press the button for 3 seconds to open the program selection menu
(2) Press the button to navigate to program P2 (or P3)
(3) Press the button to start program P2 (or P3)
(4) Press the button to select your preferred ventilation rate
Unit 2
Air flow through two adjacent doors
Unit 1
K
VSE:03
VSI:03
VSE:01 VSI:01
Bedroom
Bathroom
or
or
4
3
1
2

M-WRG/ZNH-F (-FC) User manual
M-WRG/LCD-F (-FC)
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Meltem Wärmerückgewinnung GmbH & Co.KG
Am Hartholz 4 D-82239 Alling [e-mail] www.meltem.com
Change settings:
After you have started the program you may change the manufacturer’s preinstalled settings.
(1) Press the button for 3 seconds
(2) Press the button to enter your preferred stale air ventilation rate
(3) Press the button to save your settings
(4) Press the button to be able to change the settings for the supply air ventilation rate
(5) Press the button to enter your preferred supply air ventilation rate
(6) Press the button to save your settings
(7) Press the button to return to the current operating program display
or
or
1
2
or
3
4
5
or
6

M-WRG/ZNH-F (-FC) User manual
M-WRG/LCD-F (-FC)
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Meltem Wärmerückgewinnung GmbH & Co.KG
Am Hartholz 4 D-82239 Alling [e-mail] www.meltem.com
3.4 Humidity regulation program P4
The program P4 is designed to control humidity levels in a room. Optimal values for humidity levels (comfort zone)
are between 40…65% r.H. (relative Luftfeuchte r.F.) The achievable indoor levels are depending on outdoor
temperatures and humidity.
Start program:
(1) Press the button for 3 seconds to open the program selection menu
(2) Press the button to navigate to program P4
(3) Press the button to start program P4
(4) Press the button to select your preferred ventilation rate
Change settings:
(1) Press the button to be able to change the humidity concentration “rF”
(2) Press the button to select your preferred humidity concentration
(3) After 20 seconds the “rF” symbol will stop blinking and your settings will automatically be saved. The program
starts automatically and the screen switches back to the current operating program display
or
or
or
4
2
3
1

M-WRG/ZNH-F (-FC) User manual
M-WRG/LCD-F (-FC)
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Meltem Wärmerückgewinnung GmbH & Co.KG
Am Hartholz 4 D-82239 Alling [e-mail] www.meltem.com
3.5 Temperature program P5
The M-WRG ventilation units M-WRG/ZNH-F (-FC) have three different temperature programs: Summer (Su),
Heating (HA) and constant temperature (Hc).
The ventilation units M-WRG/LCD-F (-FC) only have the temperature program Summer (Su).
Start program:
(1) Press the button for 3 seconds to open the program selection menu
(2) Press the button to navigate to program P5
(3) Press the button to start program P5
(4) Press the button to select your preferred ventilation rate
Change settings:
After you have started the program you may change the manufacturer’s preinstalled settings.
(1) Press the button for 3 seconds
(2) Press the button to navigate to your preferred temperature program
(3) Press the button to save your settings
(4) Press the button to return to the current operating program display
Su Summer program
(see ch.3.5.1)
HA Heating program
(see ch.3.5.2)
Hc Constant Temperature program
(see ch.3.5.3)
or
or
or
4
2
3
1

M-WRG/ZNH-F (-FC) User manual
M-WRG/LCD-F (-FC)
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Meltem Wärmerückgewinnung GmbH & Co.KG
Am Hartholz 4 D-82239 Alling [e-mail] www.meltem.com
3.5.1 Temperature program Summer (Su)
The temperature program Summer (Su) is designed for summer seasons. It prevents warm air from entering the
living space. The continuous ventilation will remain active as long as the outside supply air is cooler then the indoor
stale air. If the supply air gets warmer than the stale air, the program will automatically turn to the selectable
minimum ventilation rate.
The M-WRG ventilation units M-WRG/LCD-F (-FC) will automatically start the temperature program Summer (Su)
when program P5 is started.
Start program:
Start program as demonstrated in chapter 3.5
Change settings:
(1) Press the button to be able to change the continuous ventilation rate du, the minimum ventilation rate br,
or to switch to a different temperature program Pr
(2) Press the button to select your preferred continuous ventilation rate
(3) Press the button to save your settings
(4) Press the button to return to be able to select your preferred minimum ventilation rate
(5) Press the button to select your preferred minimum ventilation rate
(6) Press the button to save your settings
(7) Press the button to return to the current operating program display
Du Continuous ventilation rate
Br Minimum ventilation rate
Pr Program
or
or

M-WRG/ZNH-F (-FC) User manual
M-WRG/LCD-F (-FC)
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Meltem Wärmerückgewinnung GmbH & Co.KG
Am Hartholz 4 D-82239 Alling [e-mail] www.meltem.com
3.5.2 Temperature program Automated Heating (HA)
(Only available with M-WRG/ZNH-F (-FC) units)
The temperature program Automated Heating HA enables you to additionally warm up the incoming supply air. The
thermostat of the unit is set to about 21°C as the ideal room temperature. You may increase or decrease this
temperature by up to 3°C. The maximum ventilation r ate for this program is 4.
Start program:
Start program as demonstrated in chapter 3.5
HA Automated Heating ON
HO Automated Heating OFF
Change Settings:
(1) Press the button to be able to change the temperature
(2) Press the button to select your preferred temperature
(3) After 20 seconds the “thermostat” symbol will stop blinking and your settings will automatically be saved. The
program starts automatically and the screen switches back to the current operating program display
•If you wish to turn the Automated Heating HA OFF manually, simply press the button until the symbol
changes to Ho
•If you wish to turn the Automated Heating HA back ON, simply press the button once. The symbol should
change to HA.
or

M-WRG/ZNH-F (-FC) User manual
M-WRG/LCD-F (-FC)
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Meltem Wärmerückgewinnung GmbH & Co.KG
Am Hartholz 4 D-82239 Alling [e-mail] www.meltem.com
3.5.3 Temperature program Constant Temperature (Hc)
(Only available with M-WRG/ZNH-F (-FC) units)
The constant Temperature program Hc regulates the temperature of supply air. The M-WRG ventilation unit ensures
that supply and stale air have the same temperature, by additional warming of he supply air. To prevent overheating
the program limits the supply air temperature to max. 21°C
Start program:
Start program as demonstrated in chapter 3.5
Du Continuous ventilation rate
Pr Program
Change settings:
(1) Press the button to be able to change the continuous ventilation rate du, or to switch to a different
temperature program Pr
(2) Press the button to select your preferred continuous ventilation rate
(3) Press the button to save your settings
(4) Press the button to return to the current operating program display
or

M-WRG/ZNH-F (-FC) User manual
M-WRG/LCD-F (-FC)
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Meltem Wärmerückgewinnung GmbH & Co.KG
Am Hartholz 4 D-82239 Alling [e-mail] www.meltem.com
3.6 Air quality regulation program P6
(Only available with M-WRG/LCD-FC and M-WRG/ZNH-FC units)
The air quality program P6 is specifically designed to regulate the concentration of carbon dioxide (CO
2
). The M-
WRG unit automatically measures the CO
2
concentration in parts per million “ppm” and adjusts the ventilation rate.
You are able to set your preferred CO
2
-concentration; values between 600…1000 ppm are most preferable.
However, the finally achievable air quality depends on outside air conditions.
Start program:
(1) Press the button for 3 seconds to open the program selection menu
(2) Press the button to navigate to program P6
(3) Press the button to start program P6
(4) Press the button to select your preferred ventilation rate
Change Settings:
(1) Press the button to be able to change the ppm setting
(2) Press the button to select your preferred temperature
(3) After 20 seconds the “ppm” symbol will stop blinking and your settings will automatically be saved. The
program starts automatically and the screen switches back to the current operating program display
or
or
or
2
1
3




M-WRG User manual
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Meltem Wärmerückgewinnung GmbH & Co.KG
Am Hartholz 4 D-82239 Alling [e-mail] www.meltem.com
4. Filter replacement
The clogging of the filters is monitored automatically
by the M-WRG ventilation unit. In case the filters
need to be replaced, an acoustic signal will inform
you, 2–3 weeks prior to the replacement. The interval
of the acoustic signal will shorten over the time
interval when the filter replacement is necessary. You
must change the filters if the acoustic signal sounds
for an interval of one second per hour.
4.1 Filter selection
For the M-WRG ventilation unit you have multiple
filter options. For normal operation the Standard
Filter (G4) is sufficient.
•For persons suffering from allergies, you may
choose to install the Allergy Filter (F7). (only
needed for supply air )
•In order to prevent unpleasant odors and
emissions or even harmful gases (gasoline,
nitrogen oxides, etc.) from entering your home,
you may choose to install the Activated Carbon
Filter (F6). (only needed for supply air)
•Only use original filters made by Meltem!
Otherwise Meltem cannot guarantee a smooth
operation and will not be held liable for any
malfunctions.
Replacement filters can be ordered at your local
HVAC supplier or at www.meltem.com.
4.2 Replace filters
No tools are required to replace the filters. Both
filters should be replaced at the same time
4.2.1 Remove unit cover
•Turn OFF the M-WRG ventilation unit. The air
flaps will close automatically.
•With both thumbs, press down the two hooks on
the bottom of the M-WRG ventilation unit and at
the same time grab the edge of the cover with
both index fingers and then carefully lift the cover
up and towards you.
Model Nr. Description Model
5571 Standard filter M-WRG-FS
5572 Allergy filter M-WRG-FA
5573 Activated
Carbon filter M-WRG-FK
Caution
•Always turn the M-WRG ventilation
unit off before you open the cover
and replace the filters !
•Always replace both filters at the
same time!
•The efficiency of the unit depends
on the permeability of both filters!

M-WRG/ZNH-F (-FC) User manual
M-WRG/LCD-F (-FC)
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Meltem Wärmerückgewinnung GmbH & Co.KG
Am Hartholz 4 D-82239 Alling [e-mail] www.meltem.com
4.2.2 Remove old filters
•Twist left the filter covers and detach
•Remove old filters and discard
•Clean the cap with a damp cloth
4.2.3 Insert new filters
•Insert new filters
•Insert the filter covers (making sure the marked
arrows on case and cover are aligned) and turn
right
•The marking (arrow) on the cap has to align with
the marking on the M-WRG ventilation unit
•Make sure the covers sit flat and tight on the
cover
•Repeat this process for both supply and stale air
filter caps.
Note:
Allergy Filters or Activated Carbon Filters have to be
installed as supply air filters!
4.2.4 Close unit cover
Please ensure the correct positioning of both
filter caps before putting the cover back on!
•Grab the cover with both hands
•Place it onto the unit and insert the hooks into the
slots
•Rotate the cover downwards
•Carefully push the cover closed on the bottom
edge until the hooks on each side snap into place.
•Turn the M-WRG ventilation unit back on with the
power switch
Stale
air filter
Supply
air filter
Stale air filter Supply air filter
Hooks

M-WRG User manual
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Meltem Wärmerückgewinnung GmbH & Co.KG
Am Hartholz 4 D-82239 Alling [e-mail] www.meltem.com
5. Trouble shooting
Problem Reason Solution
M-WRG ventilation unit does not
work Installation error. Power switch, motor or main control is/are
defective.
Let a certified electrician test the
connecting wires
Air flaps do not open once the
M-WRG ventilation unit is
switched ON
If the M-WRG ventilation unit is
not operated for a longer interval
of time or operated for the first
time, the motor may not receive
power from the electronic wiring.
Air flaps may be clogged (e.g.
dirt, polystyrene, plaster, etc)
The M-WRG ventilation unit
should be switched ON and OFF
again by the operator
Remove any clogging material
(remove cover to do so, User
manual p.7)
M-WRG ventilation unit starts to
beep in intervals The M-WRG ventilation unit signals a soon to be done filter
replacement
Replace the filters.
(User manual p.7)
M-WRG ventilation unit does not
react to the remote control Check the batteries Replace batteries if necessary
Display malfunction Software fault Unplug the M-WRG ventilation
unit for approximately 30
seconds and then switch it ON
again
6. Antifreeze protection
In of case low exterior temperatures the M-WRG ventilation unit will automatically switch to the antifreeze protection
mode. During the winter season, it is recommended to ventilate the room daily for 10 minutes at the highest
ventilation rate (III), in order to avoid any condensate buildup inside the M-WRG ventilation unit.
7. Cleaning the M-WRG ventilation unit
The M-WRG ventilation unit is made of high quality synthetic material and only needs little cleaning. From time to
time we recommend cleaning the surface of the unit with a damp cloth. In order to preserve the parts we
recommend only using mild cleaning detergents. You may also use special synthetic cleaning detergents in case of
the occurrence of more resistant dirt.
Caution! Never use cleaning detergents that contain acids or corrosives! Never use a high pressure or
steam cleaner!