Daikin MicroTech III Operation Manuals page 83

High Pressure - Circuit 1, 2, 3, 4, 5, 6 - (Hi Press 1, 2,
3, 4, 5, 6: Problem)
This alarm occurs on units equipped with compressorized
cooling only . If the high pressure switch opens indicating a high
refrigerant pressure situation, the High Pressure Circuit 1, 2, 3,
4, 5, 6 problems occurs .
When the High Pressure Circuit 1, 2, 3, 4, 5, 6 problem occurs,
the unit continues to operate but the cooling circuit is disabled .
NOTE: The Circuit remains disabled until the high pressure
switch closes and the High Pressure Circuit problem
is manually cleared through the unit keypad or via a
network signal .
Sump Water Level Problem
Unit state has been cooling for the Sump Water Level Delay
time and the Sump Water Level input remains in the open
position
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 dehumidification 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 modifications:
• 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 .
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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 modifications:
• 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 .
OAT Temperature Sensor Problem -(OAT Sensor:
Problem)
If the outside air temperature sensor (OAT) is present, a valid
OAT value is not provided via the network and the local OAT
sensor is either shorted or open circuited for longer than the
Sensor Alarm Delay (default is 30 seconds), the Outside
Air Sensor problem occurs . When the OAT Sensor problem
occurs, the unit continues to operate with the following
modifications:
• Heating is not locked out due to high OAT
• Cooling is not locked out due to low OAT
• Cooling Reset and Heating Reset revert to none if they
are set to OAT
• Economizer is locked out due to high OAT
When the alarm condition is no longer present, the OAT Sensor
problem automatically clears .
Entering Water Temperature Sensor Problem - (EWT
Sensor: Problem)
If the entering water temperature sensor (EWT) is present and
either shorted or open circuited for longer than the Sensor
Alarm Delay (default is 30 seconds), the EWT Sensor problem
occurs . When the EWT Sensor problem occurs, waterside
economizer cooling is disabled . Mechanical cooling is not
locked out based on EWT . When the alarm condition is no
longer present, the EWT Sensor problem automatically clears .
Mixed Air Temperature Sensor Problem - (MAT
Sensor: Problem)
If the Mixed Air Temperature (MAT) sensor is present and
either shorted or open-circuited for longer than the sensor
alarm delay (default is 30 seconds), the MAT sensor problem
occurs . When the MAT sensor problem occurs, waterside
economizer cooling is disabled . When the alarm condition is no
longer present, the MAT sensor problem automatically clears .
83 OM 920-6 • MICROTECH UNIT CONTROLLER
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