16 ED 15121
Alarm Data Points
The following section describes the alarm data points supported by the MicroTech III Chiller Unit Controller. The unit
controller contains one holding register for every possible alarm. These holding registers are read only and can be used
to determine if any particular alarm is active or not. These points are not described in the Detailed Data Point
Information section. The alarms are defined as Warning, Problem, and Fault (see Alarms section for more details).
Tables 9-11 display the holding register for each alarm.
Table 9. Warning Alarms
Holding Register
(4xxxx)
Warning Alarms Description
369 Evaporator pump maintenance 0=Normal, 1=Alarm
371 Compressor #1 maintenance 0=Normal, 1=Alarm
373 Compressor #2 maintenance 0=Normal, 1=Alarm
375 Compressor #3 maintenance 0=Normal, 1=Alarm
376 Compressor #4 maintenance 0=Normal, 1=Alarm
377 Bad setpoint override input 0=Normal, 1=Alarm
378 Bad demand limit input 0=Normal, 1=Alarm
Table 10. Problem Alarms
Holding Register
(4xxxx)
Problem Alarms Description
384 RESTART DELAYED - Power Loss While Running Circuit #1 0=Normal, 1=Alarm
385 RESTART DELAYED - Power Loss While Running Circuit #2 0=Normal, 1=Alarm
386 RESTART DELAYED - Power Loss While Running Circuit #3 0=Normal, 1=Alarm
387 RESTART DELAYED - Power Loss While Running Circuit #4 0=Normal, 1=Alarm
388 START INHIBITED - Ambient Temperature Low 0=Normal, 1=Alarm
390 INHIBIT LOAD – Condenser Pressure High Circuit #1 0=Normal, 1=Alarm
391 INHIBIT LOAD – Condenser Pressure High Circuit #2 0=Normal, 1=Alarm
392 INHIBIT LOAD – Condenser Pressure High Circuit #3 0=Normal, 1=Alarm
393 INHIBIT LOAD – Condenser Pressure High Circuit #4 0=Normal, 1=Alarm
395 UNLOAD – Condenser Pressure High Circuit #1 0=Normal, 1=Alarm
396 UNLOAD – Condenser Pressure High Circuit #2 0=Normal, 1=Alarm
397 UNLOAD – Condenser Pressure High Circuit #3 0=Normal, 1=Alarm
398 UNLOAD – Condenser Pressure High Circuit #4 0=Normal, 1=Alarm
409 NO EWT RESET - Entering Evaporator Temperature Sensor Failure 0=Normal, 1=Alarm
411 INHIBIT LOAD - Evaporator Pressure Low Circuit #1 0=Normal, 1=Alarm
412 INHIBIT LOAD - Evaporator Pressure Low Circuit #2 0=Normal, 1=Alarm
413 INHIBIT LOAD - Evaporator Pressure Low Circuit #3 0=Normal, 1=Alarm
414 INHIBIT LOAD - Evaporator Pressure Low Circuit #4 0=Normal, 1=Alarm
416 UNLOAD - Evaporator Pressure Low Circuit #1 0=Normal, 1=Alarm
417 UNLOAD - Evaporator Pressure Low Circuit #2 0=Normal, 1=Alarm
418 UNLOAD - Evaporator Pressure Low Circuit #3 0=Normal, 1=Alarm
419 UNLOAD - Evaporator Pressure Low Circuit #4 0=Normal, 1=Alarm
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