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POINT NAME
Outdoor Air Temp Sensor
Space Relative Humidity
Sensor
Indoor Air Quality Sensor
Outdoor Air Quality Sensor
Economizer Operation
Space Temperature
Supply Air Temperature
Switch Configuration
Analog Input Configuration
Space Relative Humidity
Indoor Air Quality
Supply Fan Runtime
Compressor 1 Runtime
Compressor 2 Runtime
Heat 1 Runtime
Heat 2 Runtime
Filter
Airside Linkage Alarm
Return Air Temperature
Alarms
Alarms are provided to indicate a possible problem with the con-
troller or unit. Alarms can be checked through a network and/or
the local access device. All alarms are listed in Table 4 with name,
object name, action taken by control, reset method, and possible
cause. Some alarms can occur based on specific configurations.
SAFETY CHAIN ALARM
This alarm occurs immediately if a field installed, normally
closed, safety contact opens and interrupts 24VAC signal input #4
(J1-9). The Unit Status will be Shutdown and the System Mode
will be Disable. All unit operations stop immediately and will not
restart until the alarm automatically clears. There are no configu-
rations for this alarm; it is all based on field installed wiring. This
alarm will not occur if Fire Shutdown Alarm is active. Normal op-
eration resumes when the safety chain circuit is complete.
FIRE/SMOKE SHUTDOWN ALARM
This alarm occurs immediately when the smoke detector senses
smoke. The Unit Status will be Shutdown and the System Mode
will be Disable. All unit operations stop immediately and will not
restart until the alarm automatically clears. If there is not a smoke
detector installed or the smoke detector did not trip, check input
configurations.
NOTE: The default function for input 5 is a normally open Fire
Shutdown input.
Table 4 — VAV-RTU Open Alarms (cont)
ACTION TAKEN BY
CONTROL
Economizer and Low ambient
DX cooling lockout disabled.
Dehumidification disabled
No IAQ Operation
Control uses default OAQ
value of 400 ppm.
Alert Generated
Alert Generated
Alert Generated
Disable only wrong switch
functions
Disable 4 selectable analog
inputs
Alert Generated
Alert Generated
Alert Generated
Alert Generated
Alert Generated
Alert Generated
Alert Generated
Alert Generated
Alert Generated
Alert generated
RESET METHOD
Automatic
Automatic
Automatic
Automatic
Automatic
Automatic
Automatic
Configure correctly
Configure correctly
Automatic
Automatic
zero the timer
zero the timer
zero the timer
zero the timer
zero the timer
Automatic / reset timer
Automatic
Automatic
GAS VALVE ALARM
This alarm occurs 60 second after gas heat has been de-energized
but the Integrated Gas Control (IGC) board is still indicating a
need for fan operation. Upon alarm detection, the fan will start im-
mediately and run at its highest speed.
NOTE: The default function for input 9 is a normally open IGC
input for LC WeatherExpert units.
SUPPLY FAN FAILURE
This alarm occurs when the indoor fan is being command on and
the fan status switch feedback is showing the fan off. This will end
current operating mode and disable unit operation. This alarm re-
quires a fan status switch to be configured on one of the inputs.
SUPPLY FAN IN HAND
This alarm occurs when the indoor fan is being commanded off
and the fan status switch feedback is showing the fan is on. This
will prevent any operating mode and disable unit operation. This
alarm requires a fan status switch to be configured on one of the
inputs.
COMPRESSOR STATUS
This alarm indicates the base unit's compressor safety circuit is
energized. Cooling, heating, and supply fan outputs are not inter-
rupted. Normal operation resumes when the compressor safety
circuit is de-energized. This alarm requires field use of this de-
scribed compressor safety circuit.
31
PROBABLE CAUSE
Failure to receive valid local or network value for
Outdoor Air Temperature
Sensor reading is out of range. Bad sensor, bad
wiring, failure to receive Network or Linkage RH
value, or sensor configured incorrectly.
Sensor reading is out of range. Bad sensor, bad
wiring, failure to receive Network or Linkage RH
value, or sensor configured incorrectly.
Sensor reading is out of range. Bad sensor, bad
wiring, failure to receive Network value, or sensor
configured incorrectly.
This alarm is active whenever an economizer fault
is detected as required by the California Title 24
Economizer FDD logic.Economizer fault conditions
include; Failed to Fully Open, Failed to Open,
Failed to Close, and Stuck Open.
Space Temperature value is less than the low limit
value or greater than the high limit value
SAT is greater than the high limit value or less than
the low limit value for more than 5 minutes
More than one discrete input is configured to
provide the same function.
More than one analog input is configured to
provide the same function.
Indoor RH is greater than the high limit value or
less than the low limit value for more then 15
minutes
CO
ppm reading is above the configuration for 1
2
minute
Supply fan run time exceeded user defined limit
Compressor #1 run time limit is exceeded
Compressor #2 run time limit is exceeded
Heat Stage 1 run time limit is exceeded
Heat Stage 2 run time limit is exceeded
Dirty Filter, supply fan run time exceeded, filter
switch configuration wrong.
Airside Linkage communication from VVT
master terminal has stopped or failed
RAT is less than the low limit value or greater than
the high limit value
®
or VAV
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