VALLOX 252 D
MOUNTING OF CONTROL PANELS AND SENSORS
Carbon dioxide sensor
Mounting and wiring of the carbon dioxide sensor
13
The CO
2
sensor is wired directly from the VALLOX 252D connection box, or it can
be wired serially with another CO
2
sensor or the control panel (see the external
electrical diagram on page 9).
Cable:
NOMAK 2 x 2 x 0.5 mm
2
+ 0.5 mm
2
CO
2
sensor bottom panel
CO
2
sensor electronics board
NOTE!
Faulty coupling of the (+) wire
destroys the carbon dioxide sensor!
14
125
38
76
Carbon dioxide sensors
• Connect the carbon dioxide sensors one by one.
• When the first carbon dioxide sensor has been connected to the system, switch on
voltage. At this stage, the ventilation unit gives the sensor an address. Repeat the same
procedure for the other carbon dioxide sensors.
1 = orange 1
= +
2 = white 1
= –
3 = orange 2
= A
4 = white 2
= B
5 = metal
= signal ground
}
cirka 21 VDC
Surface mounting
Wiring
1 2 3 4 5
+ – A B M
