Swegon MIRU Function Manual page 12

GB.FUNKMIRU.121204
10.3 MIRU Control
Seven different alarms can be shown on the display screen
on the control panel of the MIRU Control.
No. 1 FAN TRIPPED
The motor control system of the MIRUVENT fan has
tripped and initiated a group alarm. To reset the alarm, see
Section 10.1 on how to reset alarms.
No. 2. FAN COMM. DEFECTIVE
MIRU Control cannot establish correct communication
with the MIRUVENT fan control system.
Check that power is being supplied to the MIRUVENT fan
and that the green LED on the motor control system is
flashing.
To reset the alarm, isolate the power supply for 2 minutes.
No. 3 FLOW SENSOR DEFECTIVE
MIRU Control cannot establish correct communication
with the pressure sensor for flow measurement.
Check that the pressure sensor is set to Address 0, and
that the communication cable is correctly connected. See
Section 4.2.
When everything is correct; the lower LED on the pressure
sensor should be lit with a steady flow and the upper LED
should be flashing.
No. 4 PRESSURE SENSOR DEFECTIVE
MIRU Control cannot establish correct communication
with the pressure sensor for flow regulation.
Check that the pressure sensor is set to Address 1, and
that the communication cable is correctly connected. See
Section 4.2.
When everything is correct; the lower LED on the pressure
sensor should be lit with a steady flow and the upper LED
should be flashing.
No. 5 TEMPERATURE SENSOR DEFECTIVE
The MIRU Control unit cannot establish correct communi-
cation with the outdoor temperature sensor.
Check that the temperature sensor is correctly connected.
See Section 4.3.
No. 6 FLOW/PRESSURE DEV.
The airflow or duct pressure continuously deviates by
+/-20% from the setpoint.
Check that the tubes to the pressure sensor are correctly
connected. See Section 4.2.
To reset alarms.
If any of the above alarms are displayed on the control
panel, and nothing else is specified on the list of alarms
above, reset the alarm by pressing the button under the
RESET text on the MIRU Control panel.
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