Daikin DPS - 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 Conguration menu to “AutoClr”.
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.
OM 1141-3 • MICROTECH UNIT CONTROLLER 78 www.DaikinApplied.com
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