Thresholds For Fault Displays; Potential-Free Alarm Contact; Behaviour In The Event Of A Co Alarm And Fault Handling; Maintenance - SystemAir IV Smart EC Montage- Und Betriebsanleitung

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| Troubleshooting/maintenance/repair/CO alarm
11.3.1

Thresholds for fault displays

The control unit distinguishes between two fault types, which are specified in more detail in the table below.
Table 10 Fault display thresholds
Fault type Setting threshold
Fan failure RPM < 130 rpm /
min
I
Sensor fault
4-20mA
11.3.2

Potential-free alarm contact

The illustration below explains the alarm contact's switching states.
1
CO alarm — fault or voltage free
11.3.3

Behaviour in the event of a CO alarm and fault handling

The control unit distinguishes between two fault types, which are specified in more detail in the table below.
Table 11 Behaviour in the event of a CO alarm and faults
No.
Problem
1
CO alarm
2
Fault

11.4 Maintenance

To ensure a reliable operation of the fan, we recommend periodic maintenance intervals. These maintenance intervals
must be specified by the operator. The frequency of maintenance activities or additional activities must be decided ac-
cording to the use of the fans. It is important for traceability to create a maintenance plan, in which the work performed
is written down.
The maintenance intervals should be shorter if the following conditions (among others) apply:
• Fan used as kitchen exhaust application
• Ambient temperature > 40°C or < -10°C, or temperature variations > 20k
Reset threshold
RPM ≥ 180 rpm / min
< 3.0 mA I ≥ 3.5 mA
4-20mA
Control terminals e.g. to connect an alarm signal
Possible cause
Critical CO concentration
reached
- Fan failure
- Sensor fault
Comment
Fan fault or fault with the fan supply cables
–> Signalled after 10 seconds
Short circuit or break in the sensor cable
–> Signalled after 3 seconds
2
Remedy / suggested solution
1. If the fan and control unit is installed in a garage
and your vehicle engine is idling, switch the engine
off.
2. Leave the room immediately and seek fresh air.
Check that everyone is present. Do not go back
into the room before it has been ventilated and the
CO alarm has stopped.
3. If the alarm triggers again after 24 hours, repeat
steps 1-2 and call the emergency gas services
(please check you have their number now) and if
necessary notify the relevant gas fitter.
Contact Systemair
Operating ok
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