Air and Water cooled inverter chillers and heat pump
EWAD TZ - EWAD TZ B - EWWD VZ
Air and Water cooled inverter chillers
and heat pump
D-EOMZC00105-17EN
Operation Manual
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6
ALARMS AND TROUBLESHOOTING
The UC protects the unit and the components from operating in abnormal conditions. Protections can be
divided in preventions and alarms. Alarms can then be divided in pump-down and rapid stop alarms. Pump-
down alarms are activated when the system or sub-system can perform a normal shutdown in spite of the
abnormal running conditions. Rapid stop alarms are activated when the abnormal running conditions require
an immediate stop of the whole system or sub-system to prevent potential damages.
The UC displays the active alarms in a dedicated page and keep an history of the last 50 entries divided
between alarms and acknowledges occurred. Time and date for each alarm event and of each alarm
acknowledge are stored.
The UC also stores alarm snapshot of each alarm occurred. Each item contains a snapshot of the running
conditions right before the alarm has occurred. Different sets of snapshots are programmed corresponding to
unit alarms and circuit alarms holding different information to help the failure diagnosis.
In the following sections it will also be indicated how each alarm can be cleared between local HMI, Network
(by any of the high level interfaces Modbus, Bacnet or Lon) or if the specific alarm will clear automatically. The
following symbols are used:
Allowed
Not allowed
Not foreseen