Operating instructions
M-WRG-S/Z-T(-F,-FC) ventilation unit
- 22 -
Meltem Wärmerückgewinnung GmbH & Co. KG
Am Hartholz 4 · D-82239 Alling
[email protected] · www.meltem.com
VENTILATION THE RIGHT WAY
V E N T I L AT I O N & H E AT R E C O V E R Y
10.5 “Supply air operation (Summer mode)” program
The ventilation unit runs in supply air operation with limited heat recovery. This
operating mode allows the cooler outdoor air to be routed into the building on sum-
mer nights, for example (supply air 50 m
3
/h, extract air 15 m
3
/h).
NOTE
This ventilation program must not be used in sub-zero temperatures. Otherwise
the ventilation unit will constantly activate the frost protection function or switch off
altogether.
10.6 “Extract air operation” program
The ventilation unit runs in extract air operation with limited heat recovery. This op-
erating mode can be selected to route used air to the outside (supply air 15 m
3
/h,
extract air 50 m
3
/h). If there are two ventilation units present, cross-ventilation can
be achieved in the building by setting one ventilation unit to supply air operation
and the other to extract air operation.
NOTE
Cross-ventilation must not be used in sub-zero temperatures. Otherwise the venti-
lation unit that is set to supply air operation will constantly activate the frost protec-
tion function or switch off altogether.
10.7 “Humidity control” program
The ventilation unit runs constantly at the lowest ventilation level (15 m
3
/h). If the
relative room air humidity exceeds 60 % RH, the ventilation level is increased
continuously up to max. 60 m
3
/h until the room air humidity drops back below 60 %
RH.
NOTE
To ensure dehumidification, the ventilation unit compares the humidity of the sup
-
ply air and extract air. The associated LED flashes when the humidity of the supply
air is greater than that of the extract air, which means that dehumidification is not
possible.
10.8 “Mixed gas/CO
2
control” program or “Automatic mode” as an option
Mixed gas/CO
2
control (standard):
The ventilation unit runs constantly at the lowest ventilation level (15 m
3
/h). A
sensor monitors the air quality in the room (CO
2
and various pollutants in gas-
eous form). If the limit of 600 ppm is exceeded, the ventilation unit calculates
the optimum air renewal and sets the required ventilation level in the range from
15 - 60 m
3
/h fully automatically.
Automatic mode (as an option):
For the M-WRG-S/Z-T-FC unit type, the “Automatic mode” ventilation program can be assigned
to the “CO
2
” program button on the InControl pushbutton sensor, either at the factory or using the
optional wireless remote control M-WRG-FBH. In this case, the relative room air humidity is moni-
CO²
