29 ED 15121
Clear Alarms - Network
Keypad Menu Path No Keypad Equivalent
This read/write holding register clears all active alarms. Many alarms are automatically clear. Of the alarms that need to
be manually cleared, only those listed below can be cleared from the network:
• UNIT SHUTDOWN - Evaporator Water Flow Loss
• UNIT SHUTDOWN–Evaporator Leaving Water Temp Low (Freeze)
• CIRCUIT SHUTDOWN – Evaporator 1 Freeze Protection
• CIRCUIT SHUTDOWN – Evaporator 2 Freeze Protection
The default is Null, which will cause Normal to be used provided nothing else is writing to this point. This register is
ignored by the unit controller if Chiller Local/Remote is set to Local.
Data Type
Holding Register
Measurement Units Valid Range
RW Holding Register
10
NA N/A
0=Normal
1=Clear Alarm
2=Null
Active Alarms
Tables 12-14 show the registers needed to read each individual alarm, the alarm index, and the alarm code.
Table 12. Modbus Warning Alarms
Warning Alarms
Alarm Class Monitoring
Alarm Index
(Holding
Register 28)
Alarm Code
(Holding
Register 31)
Individual Alarm Monitoring
Holding Registers
(0=Normal, 1=Alarm)
Alarm Description
5 1281 369 Evaporator pump maintenance
1829 371 Compressor #1 maintenance
1861 373 Compressor #2 maintenance
1893 375 Compressor #3 maintenance
7
1925 376 Compressor #4 maintenance
8 2049 377 Bad setpoint override input
9 2305 378 Bad demand limit input
11 2817 740 Unit Power Restore
3105 741 Circuit Failed Pumpdown - Circuit #1
3137 742 Circuit Failed Pumpdown - Circuit #2
3169 743 Circuit Failed Pumpdown - Circuit #3
12
3201 744 Circuit Failed Pumpdown - Circuit #4
13 3329 745 External Event
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