Installation and Commissioning Guide
ICUNO-MOD
17
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Installation and Commissioning Guide ICUNO-MOD
Doc. No. 9590-3013
Ver. 5 200722
ActronAir is constantly seeking ways to improve the design of its products, therefore specifications are subject to change without notice.
Copyright © 2019 Actron Engineering Pty. Ltd.
Symptom
Probable Cause
Suggested Resolution
Air Conditioning
Unit won’t operate
from BMS
Air Conditioner
Fault Preventing AC
from operating
OR
UNO Board
not configured
correctly for BMS
Control
• An Air Conditioner fault may prevent the unit from operating from a BMS
command.
• Or the UNO Outdoor Board may be incorrectly setup for BMS Control.
• From the unit, check the UNO Board 7-segment display for any Unit Fault Error
Codes
• Consult the Air Conditioner unit’s troubleshooting guide to resolve the fault.
• Confirm that the UNO Outdoor Board is setup for the correct BMS Control
Mode as per your installed BMS network setup
• See Section 05 for instructions on configuring UNO Outdoor Board for BMS
Control.
• From the BMS Controller, ensure that you are able to read data from the correct
BMS Registers, and that there are no address base issues.
• Try reading from Modbus Analogue Register 405 for BMS Card Software Version
• If Modbus Register 405 reads a 0, then try read from Modbus Register 406
instead. If this returns a non-zero value, then plus one offset will need to be
added to all Modbus registers.
• Check for any Air Conditioner operation faults by reading the Alarm Output
from Modbus Analogue Register 503. If this register is
1
, then the unit will not
operate.
• Check BMS Card to A/C unit communications by reading from Modbus
Analogue Register 909. If this register reads a 1, then the BMS Card is not
connected to the A/C unit correctly.
• Inspect UNO Outdoor Board and BMS Card for faults
• Check the unit fault error code by reading from Modbus Analogue Register
900.
• Consult the Air Conditioner unit’s troubleshooting guide to resolve the fault.
• Once all faults are resolved, Modbus Analogue Register 503 should be cleared,
indicating that the unit is no longer in a fault condition.
• Confirm that the UNO Outdoor Board is setup for the correct BMS Control
Mode by reading the BMS Control Mode from Modbus Analogue Register 505.
• If operating in Basic BMS Control, then Modbus Analogue Register 505 should
read 1.
• If operating in Advanced BMS Control, then Modbus Analogue Register 505
should read 2.
• See Section 05 for instructions on configuring UNO Outdoor Board for BMS
Control.
If the above steps fail to fix the problem. Contact ActronAir Technical Support on 1800 119 229 for further assistance.
