Operating and installation instructions
M-WRG-II P-T (-F, -FC), M-WRG-II E-T (-F, -FC) ventilation units
- 32 -
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 A T I O N & H E A T R E C O V E R Y
10.7
“Humidity control”
The ventilation unit runs constantly at the lowest ventilation level (10 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 humidity in the room drops back below 60% RH.
NOTICE
To ensure dehumidification, the ventilation unit compares the calculated absolute
humidity of the supply air and extract air. LED 3 (see Fig. 12 on page 23) flashes
when the humidity of the outdoor air is greater than that of the extract air, which means
that dehumidification is not possible.
10.8
“CO
2
control”
The ventilation unit runs constantly at the lowest ventilation level (10 m
3
/h*). A CO
2
sensor
monitors the air quality in the room. If the limit of 800 ppm is exceeded, the ventilation
unit calculates the optimum air renewal and sets the required ventilation level in the range
from 10 - 60 m
3
/h.
If equipped with the M-WRG-II O/VOC-AUL option, ventilation units with a CO
2
sensor
can also detect volatile organic compounds in the outdoor air using a VOC sensor (see
section 11.4 on page 34).
NOTICE
— When it is started up for the first time, the ventilation unit must remain switched on
for at least 15 hours without interruption so that the VOC sensor can be calibrated.
► Make sure that the air is not severely contaminated during the calibration phase
by solvents, for example.
— When you switch on again, it will take roughly 5 minutes for the sensor to recali-
brate.
* The ventilation level can be reduced from 10 to 0 m
3
/h at the factory or using the optional wireless remote
control M-WRG-FBH. The ventilation unit switches to sniffing mode and interrupts its operation for the set
pause time (set to 60 minutes at the factory). The relative humidity or CO
2
concentration is then checked
for a 5-minute period. If the corresponding limit is exceeded, the ventilation unit switches back to ventilation
mode.
10.9
“Automatic mode”
The relative room air humidity (see section 10.8) is monitored in addition to the CO
2
concentration (see section 10.7). The CO
2
sensor and the humidity sensor both send
feedback to the ventilation unit, indicating the ventilation level at which it should work. The
ventilation unit automatically assumes the higher of the two suggested ventilation levels
and thus ensures the priority.