Daikin Trailblazer AGZ030E-070E Installation, Operation And Maintenance Manual page 105

Event Log
An Event Log similar to the Alarm Log stores the last 50
event occurrences. Each Event Log entry includes an event
description and a time and date stamp for the event occurrence
plus the count of the event occurrences on the current day and
for each of the last seven days. Events do not appear in the
Active Alarm list.
Clearing Alarms
Active alarms can be cleared through the keypad/display or a
BAS network. Alarms are automatically cleared when controller
power is cycled. Alarms are cleared only if the conditions
required to initiate the alarm no longer exist. All alarms and
groups of alarms can be cleared via the keypad or network
via LON using nviClearAlarms and via BACnet using the
ClearAlarms object.
To use the keypad, follow the Alarm links to the Alarms screen,
which will show Active Alarms and Alarm Log. Select Active
Alarm and press the wheel to view the Alarm List (list of current
active alarms). They are in order of occurrence with the most
recent on top. The second line on the screen shows Alm Cnt
(number of alarms currently active) and the status of the alarm
clear function. Off indicates that the Clear function is off and
the alarm is not cleared. Press the wheel to go to the edit
mode. The Alm Clr (alarm clear) parameter will be highlighted
with OFF showing. To clear all alarms, rotate the wheel to
select ON and enter it by pressing the wheel.
An active password is not necessary to clear alarms.
If the problem(s) causing the alarm have been corrected, the
alarms will be cleared, disappear from the Active Alarm list
and be posted in the Alarm Log. If not corrected, the On will
immediately change back to OFF and the unit will remain in the
alarm condition.
Events
Situations may arise that require some action from the chiller
or that should be logged for future reference, but aren't severe
enough to track as alarms. These events are stored in a log
separate from alarms. This log shows the time and date of the
latest occurrence, the count of occurrences for the current day,
and the count of occurrences for each of the previous 7 days.
Unit Events
Unit Power Restore
Trigger: Unit controller is powered up.
Action Taken: None
Reset: None
Circuit Events
Low Evaporator Pressure - Hold
Trigger:
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This event is triggered if all of the following are true:
• circuit state = Run
• evaporator pressure <= Low Evaporator Pressure - Hold
set point
• circuit is not currently in a low OAT start
• it has been at least 30 seconds since a compressor has
started on the circuit.
Action Taken: Inhibit starting of more compressors on circuit.
Reset: While still running, the event will reset if evaporator
pressure > Low Evaporator Pressure Hold SP + 90 KPA (13
PSI). The event is also reset if the circuit is no longer in the run
state.
Low Evaporator Pressure - Unload
Trigger:
This event is triggered if all of the following are true:
• circuit state = Run
• more than one compressor is running on the circuit
• evaporator pressure <= Low Evaporator Pressure -
Unload set point for a time greater than half of the
current freezestat time
• circuit is not currently in a low OAT start
• it has been at least 30 seconds since a compressor has
started on the circuit.
On units equipped with 6 compressors, electronic expansion
valves, and 10 or more fans, when each compressors
starts, there should be a 2 minute window during which the
evaporator pressure must drop an additional 27 KPA (3.9 PSI)
to trigger the alarm. After this 2 minute window, the trigger
point should return to normal.
Action Taken: Stage off one compressor on the circuit every
10 seconds while evaporator pressure is less than the unload
set point, except the last one.
Reset: While still running, the event will be reset if evaporator
pressure > Low Evaporator Pressure Hold SP + 90 KPA(13
PSI). The event is also reset if the circuit is no longer in the
run state.
High Condenser Pressure - Unload
Trigger:
This event is triggered if all of the following are true:
• circuit state = Run
• more than one compressor is running on the circuit
• condenser pressure > High Condenser Pressure –
Unload set point
Action Taken: Stage off one compressor on the circuit every
10 seconds while condenser pressure is higher than the
unload set point, except the last one. Inhibit staging more
compressors on until the condition resets.
Reset: While still running, the event will be reset if condenser
pressure <= High Condenser Pressure Unload SP – 862
KPA(125 PSI). The event is also reset if the circuit is no longer
in the run state.
105 IOM 1207-6 • TRAILBLAZER
Alarms
MODEL AGZ CHILLERS
®