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SPACE TEMP SENSOR
The SPT value from the Network or Airside Linkage is no longer
being received. When this occurs the Unit Status will be Shut-
down and the System Mode will be Run. Sensor, sensor connec-
tions, wiring, board connection, and configurations should be
checked for faults or errors. Alarm will reset automatically when
cause is fixed.
ZS SENSOR
This alarm occurs if the ZS sensor wired to the VAV-RTU Open
stops communicating with the controller.
ZS Sensor
This alarm indicates a communication failure of a connected ZS
sensor that previously had been actively communicating. The
alarm is reset when normal ZS sensor communications resume, if
power is cycled to the controller, or if the Shutdown point is set to
Active.
ZS Configuration
This alarm indicates that at least one ZS sensor is configured in the
Sensor Binder properties and is not actually communicating. The
alarm is reset when the configured ZS sensor is communicating or
the configuration is changed to reflect the sensor is no longer con-
nected to the Rnet.
SUPPLY AIR TEMP SENSOR
This alarm occurs immediately when the supply air temperature
sensor wired to the VAV-RTU Open is disconnected or shorted.
When this occurs the Unit Status will be Shutdown and the Sys-
tem Mode will be Run. Sensor, sensor connections, wiring, board
connection, and configurations should be checked for faults or er-
rors. Alarm will reset automatically when cause is fixed.
LOCAL OAT SENSOR
This alarm occurs when the outdoor air sensor indicates a short or
open circuit or the Network OAT value is no longer being
received. Economizer cooling and optimal start functions are dis-
abled. Normal operation resumes when the controller detects a
valid sensor.
OUTDOOR AIR TEMP SENSOR
This alarm indicates that a valid OAT sensor value is no longer
available to the controller after having been available previously.
Economizer Operation
This alarm is active whenever an economizer fault is detected as
required by California Title 24 Economizer FDD logic. Once de-
tected, this alarm will stay active until the Shutdown input is set to
Active or the fan is stopped.
Economizer
This point indicates the specific fault detected and annunciated by
the Economizer Operation alarm above. Detected fault conditions
include: Failed to Fully Open, Failed to Open, Failed to Close, and
Stuck Open.
SPACE RELATIVE HUMIDITY SENSOR
This alarm indicates the mA input at the associated channel falls be-
low 35 mA or rises above 21 mA, or the Network value for space
RH is no longer being received. Cooling, heating, and supply fan
operation continues, however, the controller's Humidi-MiZer binary
output is disabled until the fault condition is corrected.
IAQ SENSOR
This alarm indicates the mA input at the associated channel falls
below 3.5 mA or rises above 21 mA, or the Network value for
space RH is no longer being received. Cooling, heating, and sup-
ply fan operation continues. However, the controller's IAQ control
function is disabled until the fault condition is corrected.
OAQ SENSOR
This alarm indicates the mA input at the associated channel falls
below 3.5 mA or rises above 21 mA, or the Network value for
space RH is no longer being received. Cooling, heating, and sup-
ply fan operation continues. However, the controller's IAQ control
function uses 400ppm as the fixed outdoor air CO
fault condition is corrected.
SPACE TEMPERATURE
When Occupied, a Space Temperature alarm is generated if the
space temperature falls below the lower limit or rises above the
upper limit.
When Unoccupied, an unoccupied space temperature alarm is
generated when the space temperature falls below the alarm con-
figuration Unoccupied Low SPT Alarm Limit or when the space
temperature rises above the alarm configuration Unoccupied High
SPT Alarm Limit. The following values are related to the Space
Temperature alarm:
Alarming Temperature
This variable displays the value of the space temperature that
caused the alarm and is only visible when the space temperature is
in an alarm state.
Alarm Limit Exceeded
This variable displays the value of the alarm setpoint that was ex-
ceeded by the alarming space temperature and is only visible
when the space temperature is in an alarm state.
SUPPLY AIR TEMPERATURE
This alarm indicates the supply air temperature fell below the
alarm configuration Low SAT Alarm Limit or exceeded the alarm
configuration High SAT Alarm Limit for 5 minutes. This alarm is
inhibited until the RTU has been running for 30 minutes to allow
for system stabilization after startup.
RETURN AIR TEMPERATURE
This alarm indicates the return air temperature fell below the
alarm configuration Low RAT Alarm Limit or exceeded the alarm
configuration High RAT Alarm Limit for 5 minutes. This alarm is
inhibited until the RTU has been running for 30 minutes to allow
for system stabilization after startup.
SWITCH CONFIGURATION
This occurs if more than one binary input (inputs 3, 5, and 8) is
configured for the same function. When this happens the two in-
puts (or more) configured wrong will be disabled as an inputs.
This alarm will automatically be cleared when configuration is
corrected.
An example of this would be: Input 3 = Compressor Safety, input
5 = Fan Status, and input 8 = Fan Status; the alarm would be ac-
tive, unit would run, compressor safety, and Fan Status (inputs 5
and 8) will be interpreted as "No Function."
ANALOG INPUT CONFIGURATION
This occurs if more than one analog input (inputs 1 and 2) is con-
figured for the same sensor. When this happens the two inputs will
be disabled as inputs. This alarm will automatically be cleared
when configuration is corrected. An example of this would be: In-
put 1 = IAQ Sensor, input 2 = IAQ Sensor; the alarm would be ac-
tive, unit would run, but the IAQ Sensor (inputs 1 and 2) will be
interpreted as "No Function."
SPACE RELATIVE HUMIDITY
This alarm indicates the space humidity fell below the alarm con-
figuration Low Space Humidity Alarm Limit or exceeded the
alarm configuration High Space Humidity Alarm Limit for 10
minutes. This alarm is inhibited until the RTU runs for 15 minutes
to allow for system stabilization after startup.
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level until the
2
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