Operation

At least every 10 minutes. If temperature changes of more than 2 Kelvin occur, for example, the values will be updated immediately. The same applies to the CO2 and humidity values.

Under “EXTRACT AIR”:
“Temp.”: The ambient air temperature is measured.

“Rel. humidity”: The moisture content of the ambient air is measured. This value may differ from the values issued by weather stations. This is because the air is extracted and measured in the upper part of the room.

“Abs. humidity”: The absolute humidity is the water content in one cubic metre of air. This is the more important humidity value as it takes account of the temperature. This value is also used to compare the humidity of the indoor air and outdoor air.

“CO2”: The CO2 content of the ambient air is measured.

Under “SUPPLY AIR”:
“Temp.”: The supply air temperature is measured (downstream of the heat exchanger).

“Rel. humidity”: The moisture content of the supply air is measured (downstream of the heat exchanger).

“Abs. humidity”: The absolute humidity is the water content in one cubic metre of air. This is the more important humidity value as it takes account of the temperature. This value is also used to compare the humidity of the indoor air and outdoor air.

“VOC”: The VOC content of the outdoor air is measured.

Under “OTHER”:
“Exhaust air temp.”: This is the temperature of the air that is dissipated to the outside.

“Outdoor air temp.”: This is the temperature of the air that is brought in from the outside. This can differ according to the volumetric flow rate. The value is affected by heat transfer from the wall to the outdoor air. The effects are greater in the low volumetric flow rate range.

“Operating hours”: The operating hours values are read every 24 hours. This value is the time during which the ventilation unit was switched on

The number of hours during which the unit was in ventilation mode. This also includes the standby times. The operating hours are updated once a day.

This sets a low ventilation level (e.g. 10 m³/h as standard). The volumetric flow rate can be changed using the “Button I” settings.

This sets a medium ventilation level (e.g. 30 m³/h as standard). The volumetric flow rate can be changed using the “Button II” settings.

This sets a higher ventilation level (e.g. 50 m³/h as standard). The volumetric flow rate can be changed using the “Button III” settings.

It is used to manually set the ventilation level.

The unit is running with an excess of extract air. The supply air is wholly switched off (set to 0 m³/h for the M-WRG-II series) or largely switched off (set to min. 15 m³/h for the M-WRG series). The supply air cover flap is closed (M-WRG-II) or remains open (M-WRG). The extract air and supply air flow rates are set under “Settings”.

The unit is running with an excess of supply air. The extract air is wholly switched off (set to 0 m³/h for the M-WRG-II series) or largely switched off (set to min. 15 m³/h for the M-WRG series). The extract air cover flap is closed (M-WRG-II) or remains open (M-WRG). The supply air and extract air flow rates are set under “Settings”.

In automatic mode, the ventilation unit is controlled in relation to the relative humidity and CO2 parameters. This prevents the atmospheric humidity or CO2 value in the room being too high. The unit only ventilates as required, making it especially energy-saving.

In the Humidity control program, the ventilation unit is controlled in relation to the humidity of the extract air. This prevents the atmospheric humidity in the room being too high. The unit only ventilates as required, making it especially energy-saving. The unit automatically switches to the required ventilation level to suit the humidity value (various adjustments can be made under “Settings”).

In the CO2 control program, the ventilation unit is controlled in relation to the CO2 content in the extract air. This prevents the CO2 value in the room being too high. The unit only ventilates as required, making it especially energy-saving. The unit automatically switches to the required ventilation level to suit the CO2 value (various adjustments can be made under “Settings”).

When the “Intensive ventilation” program is active, the unit ventilates at 100 m³/h for a short time (15 minutes as standard) and then switches back to the previously-set ventilation program (the running time and ventilation level can be changed under “Settings”).

The “Standby” button switches the ventilation unit to standby mode (OFF). There is no ventilation and the supply air and extract air cover flaps are closed. Press another button to switch the unit back on and perform the function associated with that button.

Humidity control:
Starting value for the humidity controller
Minimum ventilation level in control mode
Maximum ventilation level in control mode

CO2 control:
Starting value for the CO2 controller
Minimum ventilation level in control mode
Maximum ventilation level in control mode

Intensive ventilation:
Ventilation level (factory setting 100 m³/h)
Duration (factory setting 15 minutes)

Membrane touch pad:
Membrane touch pad: ON/OFF
Button 1 (I) LOW: factory setting M-WRG-II 10 m³/h; M-WRG 15 m³/h
Button 2 (II) MED: factory setting M-WRG-II 30 m³/h; M-WRG 30 m³/h
Button 3 (III) HIGH: factory setting M-WRG-II 50 m³/h; M-WRG 60 m³/h
Button 4 Extract air: 70 m³/h, M-WRG-II only
Button 4 Supply air: 70 m³/h, M-WRG-II only

Cross-ventilation:
Supply air operation: volumetric flow rate of supply air (set using slider in the app)
Supply air operation: volumetric flow rate of extract air (factory setting M-WRG-II 0 m³/h, M-WRG 15 m³/h) Extract air operation: volumetric flow rate of supply air (factory setting M-WRG-II 0 m³/h, M-WRG 15 m³/h) Supply air operation: volumetric flow rate of extract air (set using slider in the app)

CO2 control with VOC sensor in the supply air (optional, WRG-II series only)
Two-sensor controller ON/OFF
Starting value for VOC controller for supply air
Minimum volumetric flow rate for supply air
Controller delay

Other:
Pause time standby
Sniffing mode standby
Ventilation level standby
Close cover flaps standby
Audible filter message ON/OFF
Restore factory settings

It is possible for different users to set the unit if they use the app at the same time. To ensure that you receive the actual values every time you call up “Settings”, the actual values have to be read from the unit.

In the timer program, you can use up to 6 switching points per day. The set program is executed at every switching point. The program continues running until a new switching point is set or the user does something else.
Example: MON - 09.00 Humidity program ON.
The humidity program continues running until a new switching point is reached or the user selects something else. The ventilation unit will execute this command again on the following Monday.
Up to 42 switching points can be added to a ventilation unit.
Timer programs can be downloaded from the unit and saved as templates in the app. This allows you to set different timer programs, e.g. for winter/summer, without having to reset the times and programs.
Please note: These programs are only stored in the app on the relevant mobile device.
The timer program can be transferred to all selected ventilation units by selecting those units from the unit overview.

In the interval program, the ventilation unit only works intermittently, at preset times and repeatedly, if appropriate. A running time, pause time and the ventilation levels are set.
The interval program runs through the times in succession.
Example:
Volumetric flow rate – Pause: 0 m³/h
Volumetric flow rate – Running time: 30 m³/h
Pause time: 60 min.
Running time: 60 min. When you press the Start button, the unit always starts with the running time. So in this case, the ventilation unit would ventilate for 60 minutes at a volumetric flow rate of 30 m³/h. The unit will then switch to standby mode and close the cover flaps. After a 60-minute pause, the unit will start ventilating again with the running time volumetric flow rate. This will be repeated until you set something different.
The active interval program is displayed in the unit status.

In the temperature program, the ventilation unit measures the temperature of the supply air (this program requires a unit with humidity sensors). If the supply air temperature rises above the “Max. supply air temp.” value, the unit switches to standby mode (in standby mode, the ventilation unit switches the ventilation levels to 0 for 60 minutes and closes the cover flaps; when the 60-minute pause has elapsed, the unit ventilates at 20 m³/h for 5 minutes and then checks whether the conditions will allow it to resume normal operation). This program is used to prevent a room being heated unnecessarily.
If the temperature drops below the “Min. supply air temp.” value, the unit switches to standby mode to prevent the room being cooled unnecessarily.

Under “Gateway” you can rename, delete or add units and gateways

Under “Post” you can order air filters, fill in a form to request servicing and read the contact details or FAQs. This will route you to the Meltem website.

This button is used to change personal details such as your password and email address, and to unsubscribe from the app. You can also change the language to one of the other available languages. This button also calls up information such as the FAQs, publishing details and privacy policy

It takes a few seconds because the values are written directly to or looked up on the ventilation unit. This means that the values you see are actually feedback from the unit, rather than values displayed in the app.

You can control as many units as you wish. The possible number will depend on how many gateways are registered

Yes. From anywhere in the world if the mobile device and gateway have access to the Internet

Yes, when you name the units you can create groups under “Options”.
You can sort them into three types of group:
- Location
- Area
- Unit name

Example:
Location: Alling
 Area: 1st floor
 Name: Sales office

How the units are displayed in the app:
Alling → 1st floor → Sales office

Yes, using the “Select” or “Select All” menu from the unit overview. You can then control or set all the selected units via “Set”.

You can edit units under “Gateway”.

If certain icons are greyed out, the ventilation unit does not have the necessary sensors

No.