AIRSYS UNICOOL 28V1B5 - 4.6 Alarms and History Management

System Operation
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Note: The unit will stay under manual control until step “STOP” is selected. Make sure that “STOP” is selected
and the unit is on before leaving the site to avoid potential high temperature alarms. To verify, the system
status on the main screen should be “ON”.
Warning. Once the compressor has been turned on, it must be allowed to run for
at least three minutes before the next step to prevent compressor damage.
4.6 Alarms
When a problem occurs during unit operation, the controller records the related information and the Alarm
button will be lit. Depending on the severity of the alarm, various components are automatically shut down.
The system will automatically restart most components after a defined delay period. However, manual reset is
required when certain alarms occur three times within an hour (configurable). A description of all system alarms
is given below.
Table 4-6 Alarm Descriptions
Code
Description
User/Auto Reset
AL*01
Too Many Internal Memory Writes
User reset
AL*02
Internal Memory Read/Write Error
User reset
AL*03
Outdoor Temperature Sensor Error
Auto reset
AL*04
Indoor Temperature Sensor Error
Auto reset
AL*05
Humidity Sensor Error
Auto reset
AL*06
Smoke/Fire alarm
Auto reset
AL*07
Generator Run
Auto reset
AL*08
DC Failover Active
Auto reset
AL*09
AC Power Failure
Auto reset
AL*10
Low Press Lockout
User reset
AL*11
High Temp Alarm
Auto reset
AL*12
Low Temp Alarm
Auto reset
AL*13
Hydrogen Alarm
Auto reset
AL*14
Dirty Condenser Alarm
User reset
AL*47
High Pressure Sensor Error
Auto reset
AL*48
Discharge Temperature Sensor Error
Auto reset
AL*49
Suction Pressure Sensor Error
Auto reset
AL*50
Suction Temperature Sensor Error
Auto reset
AL*51
Supply Temperature Probe Error
Auto reset
AL*52
Condenser Temperature Probe Error
Auto reset
AL*53
Compressor Overload
Auto reset
AL*54
High Pressure Switch Alarm
Auto reset