Swegon CLASS UNIT Operation & Maintenance Instructions Manual page 41

7.20 TYPE 18: ALARM INDICATING AN INCORRECT POSITION OF THE MODULATING
BYPASS RELATIVE TO THE ORDERED POSITION
- Conditions:
• units with modulating bypass
- Causes:
• This alarm indicates that the modulating bypass has not reached the ordered position within 10 seconds.
The most common reason for this is a damaged position sensor on the bypass actuator, and this must be replaced.
Other reasons may be that the control board output is damaged, implying the replacement of the board, or a
mechanical blocking verified by a visual inspection of the bypass
- Effects:
B.20 Position of the modulating bypass incorrect
AL1 relay
Alarm Status
7.21 TYPE 19: ALARM INDICATING THAT THE HOURS LIMIT FOR THE MAINTENANCE OF
THE FILTERS HAS BEEN REACHED
- Conditions:
• The basic setup parameter "Filters Resets" must be >0
- Causes:
• Alarm indicating that the hours limit for the maintenance of the filters has been reached
- Effects:
Text displayed
FILTERS ALARM
AL1 relay
/
Operation and maintenance
Displayed on HMI TACtouch
Text displayed
O.R.1
/
Manual reset mandatory.
Displayed on HMI TACtouch
O.R.1
/
Auto reset: via dedicated reset
instructions – CLASS UNIT TAC5
TAC control board
LED ALARM
ON
LED ALARM
Red
TAC control board
LED ALARM
ON
LED ALARM
RED
LED AF
/ Stopped
LED Pa
/
LED AF
/
LED Pa
/
Fans
Fans
/
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