
Operating and service manual
100 of 222 pages
303
AirEx No connection
Warning
Description
Air Exchange Sensor Short Circuit
Cause
Indication of a loose connection, defect or lack of air exchange sensor
Trouble
shooting
Possible causes:
•
AirEx is out of calibration
•
Air exchange sensor AirEx or cable defective.
•
X1 cable is defect.
•
Controller PCB defective.
Accompanied alarms:
•
AL 305.
Trouble shooting:
1) If the cable by inspection is defect, replace cable.
2) Calibrate AirEx see p.188
If the value shown in controller is wrong or alarm still active then disconnect the
cable for AirEx from the connector PCB according to the wiring schematics
inside the control cabinet and from the AirEx sensor.
3) Mount the cable for AirEx in controller cabinet and on the sensor. Disconnect
signal wire on interface/terminal block PCB. Measure voltage between wire
and GND on the interface/terminal block PCB. If the voltage is over 4.0 V
DC, sensor or connection between sensor and cable is defect. If the voltage
is between 0.2 V DC and 4.0 V DC, continue to 4).
4) Mount signal wire. Measure voltage between SIGNAL and GND. If the voltage
is between 0.2V DC and 4.0V DC and this alarm is still active continue to 5).
5) Check controller, see
Trouble shooting for Star Cool Controller
p.56
before replacing controller door.
Criteria
Value above high alarm limit 225 m
3
/hour
Controller
action
None
Log
X
Alarm
X
Alarm light
Off
Consequence
Elimination
When sensor value becomes valid, it is marked as inactive in alarm list and may then be
deleted.
Log data
Parm 1
Parm 2
Parm 3
Parm 4
Parm 5
Active/Inactive Low limit
High limit
Current