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| Operation
9.7.2
Warm-up time
Once the operating voltage has been connected, the control unit is in a warm-up state for around 6.5 minutes. During
this time, no CO measurements are carried out and no CO alarms are triggered. To ensure basic ventilation and to re-
move any raised CO concentrations in the air, the fans are controlled at a minimum speed. The warm-up time is needed
to give the CO sensor enough time for the CO measuring transducer's warm-up phase. Once the warm-up time has
elapsed, the control unit switches to its normal operating state (ready) and CO analysis takes place.
9.7.3
Visual and audible display
The table below distinguishes between the displays based on the control unit's four operating modes.
Table 7 Visible and audible display
Operating mode
Warm-up time
Ready
CO alarm
Fault
Table 8 Carbon monoxide alarm thresholds
CO concentration for activation of
the CO alarm
30 ppm
50 ppm
100 ppm
300 ppm
10
Operation
10.1 Safety information
Warning: Hazard from electrical voltage or moving components.
♦ The device may only be operated by adequately qualified persons, details see Table 1 Qualifications, page 6.
♦ The device may only be operated by people who are instructed in and have understood the function and risks, and
can act accordingly.
♦ Abide by the system-related conditions and requirements of the system manufacturer or plant constructor.
10.2 Preconditions
♦ Ensure access only to persons who can safely handle the device.
♦ Only use the fan in accordance with the operating instructions and the operating instructions for the motor.
♦ Do not dismantle or circumvent safety elements, or put them out of function.
Audible signal
CO alarm
generator
Red LED
No
No
No
No
On
Rapid flashing 2 Hz
No
2 fast sounds / min
Control unit trigger times
No alarm
After around 75 min
After around 25 min
After around 1 min
Operation
Fault
Green LED
Yellow LED
On
No
On
No
On
No
On
Rapid flashing 2 Hz
CO concentration for resetting of the
active CO alarm
No alarm
< 40 ppm
< 40 ppm
< 40 ppm
GB
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