Daikin D-AHU Professional AH-ERQ-U, Руководство по эксплуатации

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D-EOMOAH00903-21_01EN 27 / 37
Alarm String Description Possible causes & solutions
the digital input “Electric
Heaters Overload.
”
The Electrical heating
device is in over
temperature Check if there are some airflow
problems before resetting the
alarm
Supply press:
under range
Problem with the supply air
pressure sensor Causes Solutions
Supply pressure sensor not
connected Check the wiring connection of the
supply sensor. Check the electrical
power of the device
Supply pressure sensor
broken
Replace the sensor
Return press:
under range
Problem with the return air
pressure sensor Causes Solutions
Return pressure sensor not
connected Check the wiring connection of the
return sensor. Check the electrical
power of the device
Return pressure sensor
broken
Replace the sensor
Rtrn tmp fire
alarm: Alarm
Return air temperature too
high, possible presence of
fire Causes Solutions
Presence of fire
Return temperature sensor
broken Verify if in the alarm list there is
some alarm related to the return
temperature sensor and in this
case refer to it
Supply tmp
fire alm:
Alarm
Supply air temperature too
high, possible presence of
fire Causes Solutions
Presence of fire
Supply temperature sensor
broken Verify if in the alarm list there is
some alarm related to the supply
temperature sensor and in this
case refer to it
Fire alarm:
Alarm
Fire alarm active.
This alarm occurs when the
fire detector device detects
the presence of fire
Causes Solutions
Presence of fire
If no fire is present, the fire
alarm system could be
broken Check the Fire alarm system
Heating Frost:
Frost
This alarm occurs when the
external unit communicate to
the controller (through the
digital input “Frost Switch”)
that there could be ice on the
exchanger of the external unit Causes Solutions
No heating from the
exchanger Check hydraulic circuits and his
temperature, 3way valve, external
unit
Outside temperature very
low The alarm will auto-reset when
“Frost Switch” deactivates. If this
alarm occurs several times, try to
increase “Frost sp” or “Frost Off
Delay”.
Recovery Alarm
Causes Solutions