Daikin DPS Installation And Maintenance Manual page 78

Control Temperature Fault – (Control
Temp: Fault)
If the temperature sensor (ZNT1, RAT, OAT) selected as
the control temperature source is not reliable for longer than
the Sensor Alarm Delay (Default= 30 seconds), a Control
Temperature Fault occurs . When the Control Temperature
Fault occurs, the unit is shut down . It remains shut down until
the Control Temperature Fault is manually cleared through the
unit keypad or via a network signal .
Emergency Stop Fault – (Emerg Stop:
Fault)
An Emergency Stop Fault will occur if either of the following
conditions is true:
• Emergency Stop Input in the Alarm (Open) condition
• The Net Emrg Ovrd input is set to Off via a network signal
or the keypad/display
This alarm normally is set for manual clear operation but it can
be changed to auto-clear by setting the Emerg Stop parameter
in the Alarm Configuration menu to "AutoClr".
OM 1141-3 • MICROTECH UNIT CONTROLLER
Freeze Fault – (Freeze: Fault)
When a unit is equipped with a hot water coil, the Freeze Fault
occurs when the optional freezestat contacts open as a result
of detecting an abnormally low water or steam coil temperature
while the fans are running .
When the Freeze fault occurs, the controller shuts down the
fans, opens the heating valve and sets a 10-minute timer .
When the 10-minute timer expires, the controller checks the
freezestat input again . If the freezestat contacts are closed the
valve closes . If the freezestat contacts are still open, the valve
remains open, and the 10-minute timer resets . This continues
until the fault is manually cleared through the keypad or via a
network signal .
NOTE: The water valve remains open for 10 minutes after
alarm conditions disappear .
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