Daikin DPS - Alarm Clearing; Warnings; Problems

Alarm Clearing
Active alarms can be cleared through the keypad/display or a
BAS network. Alarms are automatically cleared when power
is cycled. Alarms are cleared only if the conditions required
to initiate the alarm do not exist. All alarms and groups of
alarms can be cleared via the network or keypad by setting the
ClearAlms variable to a non-zero value as indicated in the table
below. Emergency Off Faults can be set to automatically clear
once the condition that caused the alarm is corrected. This
can be accomplished by navigating to Commission Unit/Alarm
Conguration/Emerg Stop and changing the default ManClr
value to AutoClr.
NOTE: The enumeration text is what shows up on the
keypad/display not the number. The value of this
variable automatically reverts to zero when the
alarms are cleared. This variable may be set through
the keypad in the Active Alarm menu. It may be set
via LON using nviClearAlarms and via BACnet using
the ClearAlarms object.
Alarm List Menu – see page 63.
Table 60: Alarm Clearing
Warnings
Dirty Filter - (Dirty Filter: Warning)
If the pressure drop across the lter section in the unit exceeds
the setting of the differential pressure switch the Dirty Filter
warning occurs. When the Dirty Filter warning occurs, unit
operation is not affected. The Dirty Filter warning must be
manually cleared through the unit keypad or via a network
signal.
Airow Switch - (Airow Sw: Warning)
If the unit has been in the Off operating state for at least
thirty minutes and the PC7 airow switch input to the main
controller indicates airow, the Airow Switch warning occurs.
This normally indicates a problem with the PC7 airow switch.
When the Airow Switch warning occurs, unit operation is not
affected. When the alarm condition is corrected, the Airow
Switch warning must be manually cleared through the unit
keypad or via a network signal.
Return/Exhaust Fan – (RetExhFan:
Warning)
If the unit is equipped with a variable speed return or exhaust
air fan motor and communication is interrupted between the
controller and the motor controller or if the motor controller
generates an internal fault and shuts itself down the RetExhFan:
Warning occurs. Unit operation continues with the fan off and the
alarm is automatically cleared when the problem is corrected.
Problems
Entering Fan Temperature/Leaving Coil
Temperature Sensor Problem - (EFT/LCT
Snsr: Problem)
This alarm occurs when the Entering Fan Temperature/Leaving
Coil Temperature sensor is present and either shorted or open
circuited for longer than the Sensor Alarm Delay (Default = 30
seconds). When this alarm occurs the unit continues to operate
however dehumidication operation is disabled until the sensor
becomes reliable. The maximum DAT limit function associated
with gas or electric heat is also disabled until the sensor
becomes reliable.
Return Air Temperature Sensor Problem
- (RAT Sensor: Problem)
If the return air temperature sensor (RAT) is present and either
shorted or open circuited for longer than the Sensor Alarm
Delay (default is 30 seconds), the Return Air Sensor problem
occurs. When the RAT Sensor problem occurs, the unit
continues to operate with the following modications:
• Cooling Reset and Heating Reset revert to none if they
are set to Return
• Control temperature source reverts from return to space if
a space temperature sensor is present and reliable
When the alarm condition is no longer present, the RAT Sensor
problem automatically clears.
Space Temperature Sensor Problem -
(Space Sensor: Problem)
If the Space Sensor Present setting is set to Yes, a valid Space
Temperature value is not provided via a network signal and
the local space sensor is shorted or open circuited longer
than the Sensor Alarm Delay (default is 30 seconds), the
Space Temperature Sensor problem occurs. When the Space
Temperature Sensor problem occurs, the unit continues to
operate with the following modications:
• Cooling Reset and Heating Reset revert to none they are
set to Space
• Control temperature source reverts from space to return if
a return air sensor is present and reliable.
When the alarm condition is no longer present, the Space
Temperature Sensor problem automatically clears.
Value Action
0 None
1 Clear All Faults
2 Clear All Problems
3 Clear All Warnings
4 Clear All Alarms
alarMs
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