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Table 18 – Troubleshootin g Alarms
POINT NAME
BACnet
OBJECT
NAME
ACTIONTAKEN BY
CONTROL
RESET
METHOD
PROBABLE CAUSE
Safe ty Chain Alarm safety_chain
Alarm Generated
Immediate
Shutdown
Automatic Over load Indoor Fan or Electric Heater overheat.
Fire Shutdown Alarm fire_alarm
Alarm Generated
Immediate
Shutdown
Automatic
Smoke detected by smoke detector or
configuration incorrect
Space Temp Sensor
Failure
spt_alarm
Alarm Generated
Immediate
Shutdown
Automatic
Faulty, shorted, or open thermistor caused by
wiring error or loose connection.
SAT Sensor Alarm sat_alarm
Alarm Generated
Immediate
Shutdown
Automatic
Faulty, shorted, or open thermistor caused by
wiring error or loose connection.
High Space Temp Alarm spt_hi Alarm Generated Automatic
Thespacetemperaturehasrisenabovethecool
setpoint by more than the desired amount.
Low Space Temp Alarm spt_lo Alarm Generated Automatic
The space temperature has dropped below the
heat setpoint by more than the desired amount.
High Supply Air Temp sat_hi Alarm Generated Automatic
SAT is greater then 160 degrees for more than 5
minutes.
Low Supply Air Temp sat_lo Alarm Generated Automatic
Thesupplyairtemperatureisbelow35_Ffor
more than 5 minutes.
Supply Fan Failed to
Start
sf_fail
Alarm Generated
Immediately
disable Operation
Automatic
Tripped Circuit Breaker, Broken belt, Bad indoor
fan motor, Configuration incorrect, Bad fan status
switch.
Supply Fan in Hand sf_hand
Alarm Generated
Ramp down
Operations
Automatic Bad Fan Status Switch, Configura tion incorrect.
Compressor Safety
Alarm
dx_compstat Alarm Generated Automatic Compressor would n ot start.
Setpoint Slider Alarm slide_alarm
Alarm Generated
Offset set to zero
Automatic
STOsensorisopenorshortedformorethen5
seconds.
Dirty Filter Alarm filter Alarm Generated
Automatic/ re
set timer
when
configured
with or
without
switch
Dirty Filter, supply fan run time exc eeded, filter
switch configuration wrong.
Switch Configuration
Alarm
sw_cfg_alarm
Alarm Generated
Disable
misconfigure d switch
functions
Configure
correctly
More than one binary input is configured for the
same purpose. More then one discrete input is
configured to provide the same function.
Misconfi gure d Analog
Input
an_cfg_alarm
Alarm Generated
Disable 4 selectable
analog inputs
Configure
correctly
More then one analog input is configured to
provide the same function.
OAT Sensor Alarm oat_alarm
Alarm Generated
Economizer and Low
ambient DX cooling
lockout disabled.
Automatic
Faulty, shorted, or open thermistor caused by
wiring error or loose connection.
Space RH Sensor Alarm sprh_alarm
Alarm Generated
Dehum idification
disabled
Automatic
Sensor reading is out of range. Bad sensor, bad
wiring, or sensor configured incorrectly.
Outdoor RH Sensor
Alarm
oarh_alarm Alarm Generated Automatic
Sensor reading is out of range. Bad sensor, bad
wiring, or sensor configured incorrectly.
High Space Humidity sprh_hi Alarm Generated Automatic
IRH is greater then 70% for more then 10
minutes.
Low Space Humidity sprh_l o Alarm Generated Automatic IRH is less then 35% for more then 10 minutes.
IAQ Sensor Alarm iaq_alarm
Alarm Generated
Disables IAQ
Operation
Economizer moves
to minimum position
Automatic
Sensor reading is out of range. Bad sensor, bad
wiring, or sensor configured incorrectly.
OAQ Sensor Alarm oaq_alarm
Alarm Generated Set
OAQ to 400
Automatic
Sensor reading is out of range. Bad sensor, bad
wiring, or sensor configured incorrectly.
High Carbon Dioxide
Level
co2_hi Alarm Generated Automatic CO2 reading is above 1200ppm .
Supply Fan Runtime
Alarm
sf_rntm Alarm Generated
clear the
timer
Supply fan run time exceeded user defined limit.
Compressor 1 Runtime
Alarm
dx1_rntm Alarm Generated
clear the
timer
Compressor run time limit is exceede d.
Compressor 2 Runtime
Alarm
dx2_rntm Alarm Generated
clear the
timer
Compressor run time limit is exceede d.
580J