56FläktGroup DC_9355GB 20180119_R0 We reserve the right to make changes without prior notice
Alarm guide
Continued on next page
Alarms Alarm text Cause Action Type
Pre-alarm supply air
filter
Supply Filter
Pre-alarm
The measured differential
pressure over the supply
air filter exceeds the set
value for the pre-alarm,
normally because the filter
soon needs replacing.
• Check the pressure drop over the supply air
filter. Keep a new filter ready and wait until
the message 'Alarm supply air filter' appears.
• If the pressure drop over the supply air filter
is low in relation to the desired final pressure
drop. Adjust the level for the pre-alarm using
the handheld terminal.
C
Pre-alarm, extract
air filter
Exhaust Filter Pre-
alarm
The measured differential
pressure over the extract
air filter exceeds the set
value for the pre-alarm,
normally because the filter
soon needs replacing.
• Check the pressure drop over the extract
air filter. Get a new filter and wait until the
message 'Alarm extract air filter' appears.
• If the pressure drop over the extract air filter
is low in relation to the desired final pressure
drop. Adjust the level for the pre-alarm using
the handheld terminal.
C
Exception alarm,
supply air fan
Sply fan deviation:
Active
The measured supply
airflow/pressure has
deviated from the setpoint
for an abnormally long time.
• Check that the dampers open.
• Check the filter pressure drop.
• Check that the pressure sensor is
correctly connected. The fan should be
connected to P1.
• Calibrate the pressure sensor (stop
the unit and depress the button on the
sensor for 15 s).
• Check cap on unused measurement nipples.
• Check that the pressure hoses have not
been disconnected.
• Check the external pressure drop.
A
Exception alarm,
extract air fan
Exh fan dev alarm:
Active
The measured extract
airflow/pressure has
deviated from the setpoint
for an abnormally long time.
• Check that the dampers open.
• Check the filter pressure drop.
• Check that the pressure sensor is correctly
connected. The fan should be connected to P1.
• Calibrate the pressure sensor (stop the unit
and depress the button on the sensor for 15 s).
• Check cap on unused measurement nipples.
• Check that the pressure hoses have not
been disconnected.
• Check the external pressure drop.
A
Operating period
alarm
Fan op hours
alarm
The unit's operating period
has reached the alarm
limit. This function is
usually used to signal that
maintenance is due.
• Reset the operation time counter and
acknowledge the alarm.
• If desired, the alarm limit can be changed or
the function can be completely disabled via
the handheld terminal.
B
Alarm supply air fan Supply fan alarm:
Alarm
See alarm number on page
52.
• Go the the Main index Ú Unit Ú
Fan control Ú Supply air fan Ú
Alarm number.
B
Alarm extract air fan Exhaust fan alarm:
Alarm
See alarm number on page
52.
• Go the the Main index Ú Unit Ú
Fan control Ú Extract air fan Ú
Alarm number.
B
Supply air flow below
range
Supply air flow:
under range
The differential pressure
sensor for the supply
air fan is faulty or dis-
connected.
• Check that the differential pressure
sensor on the supply air fan is connected.
• Calibrate the differential pressure sensor
(stop the unit and depress the button on the
sensor for 15 s).
A
14
To Next Page
