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8.3 CO
2
sensor (Xcell 400 QVW model only)
The terminal box for all wiring connections is situated on top of the MVHR. The CO
2
Sensor will only function in
conjunction with the Automatic 3-Speed Switch, described in section 8.2. Refer to sections 7.3 and 7.4 for the
relevant wiring diagrams and associated controllers that are compatible with the CO
2
Sensor. With jumper 10
selected on the PCB, the CO
2
Sensor is active. Only one CO
2
Sensor may be connected to each MVHR.
Minimum size of 3-core cable to be used for switch connections: 0.5mm².
The MVHR only reacts to the CO
2
Sensor when Fan speed 2 is activated on the Automatic 3-Speed Switch. Fan
speed 2 is always displayed on the Automatic 3-Speed Switch, regardless of whether the CO
2
values are displayed
as <900 ppm (speed 1) or >1100 ppm (speed 3) on the CO
2
Sensor. With this setting, the CO
2
Sensor is always
prioritised. As soon as the Moisture Protection speed, speed 1 or speed 3 is manually activated on the Automatic 3-
Speed Switch, the CO
2
Sensor is deactivated.
Switch points of the CO
2
Sensor:
> 1.5 V MVHR switches from speed 2 to speed 1;
< 900 ppm
> 5.0 V MVHR switches from speed 1 to speed 2;
> 1000 ppm
> 7.5 V MVHR switches from speed 2 to speed 3;
> 1100 ppm
< 5.0 V MVHR switches from speed 3 to speed 2;
< 1000 ppm
8.4 Humidity sensor (Xcell 400 QVW model only)
The terminal box for all wiring connections is situated on top of the MVHR.
Refer to sections 7.4 & 7.5 for the relevant wiring diagrams.
Minimum size of 3-core cable to be used for switch connections: 0.5mm².
This product is designed to measure humidity and temperature in indoor applications.
It uses a capacitive sensor element for the humidity measurement.
At 50% RH the MVHR changes to speed 2.
At 75% RH the MVHR changes to speed 3.
Note:
When using Humidity Sensors in conjunction with the Automatic 3-Speed Switch a maximum of four Humidity
Sensors can be connected. When using Humidity Sensors in conjunction with the Automatic 3-Speed Switch and a
CO
2
Sensor a maximum of three Humidity Sensors can be connected.
Summary of Contents for Xcell 400 QV
Page 10: ...10 5 8 Installation dimensions 5 8 1 Right hand installation ...
Page 11: ...11 5 8 2 Left hand installation ...
Page 43: ...43 ...
