Heat recovery unit RDKS - Technical manual
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FläktGroup DC_9295GB_20190326_R5
We reserve the right to make changes without prior notice
OVERHEATING PROTECTION, ROTOR ALARM, TEMPERATURE ALARM, OTHER ALARMS
THERMAL OVERLOAD PROTECTION
The fan motors are equipped with thermal overload protection devices,
which are reset manually by briefly disconnecting the power.
The electric heaters have two thermal overload protection devices, one
automatic and one manual. The automatic overheating protection trips
before the manual one, which means it does not normally need to be
reset.
If the manual overheating protection for the electric heater has tripped
during operation, first the power to the unit should be switched off and
then the overheating protection should be reset by pressing the reset
button.
In order to access the button, the electric heater must be disconnect-
ed.
If the manual overheating protection trips again, call qualified service
personnel.
ROTOR ALARM
If the rotor motor stops and the Tacho signal disappears, five attempts
will automatically be made to restart the rotor (start/stop). If this does
not solve the problem, the unit will stop and the rotor alarm will be in-
dicated.
TEMPERATURE ALARM
Generates an alarm and stops operation if the supply air temperature
drops below +5 °C. The alarm is disabled during defrosting or dur-
ing forced operation with a cooker hood. A 10-minute delay ensures
that the supply air temperature has time to rise if operation has been
stopped.
OTHER ALARMS
The unit has various alarms that are not supported by the simple
ISYteq Basic control panel (accessory).
If any of these alarms are triggered, the unit will stop running and all
the LEDs on the ISYteq Basic will be extinguished. This also happens
in the event of power failure. A LED on the control card indicates that
the power is not switched off.
To reset these alarms, the unit must be restarted by pulling out and
reconnecting the plug.
If the ISYteq Touch 3.5 control panel (accessory) is used, the alarm will
be presented in plain text.
If the alarm recurs, service personnel will be called for assistance.
SENSOR ERROR
If any of the temperature sensors starts malfunctioning, the unit will
stop running. To reset, follow the instructions under Other alarms.
EXTERNAL ALARM
An external alarm can be connected to the unit. If this alarm is trig-
gered, the unit will stop running To reset, follow the instructions under
Other alarms.
