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Table 23 – Troubleshooting Alarms
POINT NAME
BACnet
OBJECT
NAME
ACTION TAKEN BY
CONTROL
RESET
METHOD
PROBABLE CAUSE
Safety Chain Alarm safety_chain
Alarm Generated
Immediate
Shutdown
Automatic Over load Ind oor Fan or Electric Heater overheat.
Fire Shutdown Alarm fire_alarm
Alarm Generated
Immediate
Shutdown
Automatic
Smoke detected by smoke detector or configura-
tion 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, Configuration incorrect.
Compressor Safety
Alarm
dx_compstat Alarm Generated Automatic Compressor would not start.
Setpoint Slider Alarm slide_alarm
Alarm Generated
Offset set to zero
Automatic
STOsensorisopenorshortedformorethen5
seconds.
Dirty Filter Alarm filter Alarm Generated
Automatic/
reset timer
when config-
ured with or
without
switch
Dirty Filter, supply fan run time exceeded, filter
switch configuration wrong.
Switch Configuration
Alarm
sw_cfg_alarm
Alarm Generated
Disable misconfi-
gured 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.
Misconfigured Analog In-
put
an_cfg_alarm
Alarm Generated
Disable 4 selectable
analog inputs
Configure
correctly
More then one analog input is configured to pro-
videthesamefunction.
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
Dehumidification
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 min-
utes.
Low Space Humidity sprh_lo Alarm Generated Automatic IRH is less then 35% for more then 10 minutes.
IAQ Sensor Alarm iaq_alarm
Alarm Generated
Disables IAQ
Operation Econo-
mizer moves to mini-
mum 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 exceeded.
Compressor 2 Runtime
Alarm
dx2_rntm Alarm Generated
clear the
timer
Compressor run time limit is exceeded.
48TC