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Table 4 – RTU--OPEN Alarms
POINT NAME
BACnet Object
NAME
ACTION TAKEN BY
CONTROL
RESET METHOD PROBABLE CAUSE
Safety Chain safety_alarm Immediate Shutdown Automatic
Over load Indoor Fan or Electric
Heater ov erheat
Fire Shutdown fire_alarm Immediate Shutdown Automatic
Smoke detected by smoke de-
tector or configuration incorrect
Supply Fan Failure sfan_fail_alarm
Immediately disable
Operation
Automatic
Tripped Circuit Breaker, Broken
belt, Bad indoor fan motor, Con-
figuration incorrect, Bad fan
status switch.
Supply Fan in Hand sfan_hand_alarm Ramp down Operations Automatic
Bad Fan Status Switch, C onfigur-
ation incorrect.
Compressor Safety comp_alarm Alert Generated Automatic Compressor would not start
Space Temp Sensor spt_fail Ramp down Operations Automatic
Faulty, shorted, or open thermis-
tor caused by wiring error or
loose connection.
Supply Air Temp
Sensor
sat_alarm Economizer Disabled Automatic
Faulty, shorted, or open thermis-
tor caused by wiring error or
loose connection.
Outdoor Air Temp
Sensor Alarm
oat_alarm
Economizer and Low ambient
DX cooling lockout disabled.
Automatic
Faulty, shorted, or open thermis-
tor caused by wiring error or
loose connection.
Space Relative
Humidity Sensor
sprh_alarm Dehumidification disabled Automatic
Sensor reading is out of range.
Bad sensor, bad wiring, or sensor
configured incorrectly.
IAQ Sensor iaq_alarm No IAQ Operation Automatic
Sensor reading is out of range.
Bad sensor, bad wiring, or sensor
configured incorrectly.
OAQ Sensor oaq_alarm Set OAQ to 400 Automatic
Sensor reading is out of range.
Bad sensor, bad wiring, or sensor
configured incorrectly.
Space Temperature spt_alrm_status Alert Generated Automatic
Space value is less then the low
allowed value or Space value is
greater then the high allowed
value
Alarming
Temp e rature
spt_alrm_temp
Shows temperature that
caused alarm
N/A N/A
Alarm Limit
Exceeded
spt_alrm_lmt
Shows the limit that was ex-
ceeded
N/A N/A
High Supply Air
Temp e rature
sat_hi_alarm Alert Generated Automatic
SAT is greater then the configura-
tion for more then 5 minutes
Low Supply Air
Temp e rature
sat_lo_alarm Alert Generated Automatic
SAT is less then the configuration
for more then 5 minutes
Setpoint Slider slidepot_alarm Set Offset to zero Automatic
STO sensor is open for more then
5seconds
Switch Configuration di_cfg_alarm
Disable only wrong switch
functions
Configure correctly
More then one discrete input is
configured to provide the same
function.
Analog Input
Configuration
ai_cfg_alarm
Disable 4 selectable analog
inputs
Configure correctly
More then one analog input is
configured to provide the same
function.
High Space Relative
Humidity
sprh_hi_alarm Alert Generated Automatic
IRH is greater then the configura-
tion for more then 15 minutes
Low Space Relative
Humidity
sprh_lo_alarm Alert Generated Automatic
IRH is less then the configuration
for more then 5 minutes
High C O2 co2_alarm Alert Generated Automatic
CO2 reading is above the config-
uration for 1 minute
Supply Fan Runtime sfan_rntm_alarm Alert Generated zero the timer
Supply fan run time exceeded
user defined limit
Compressor 1 Runtime
comp1_rntm_alar
m
Alert Generated zero the timer
Compressor run time limit is ex-
ceeded
Compressor 2 Runtime
comp2_rntm_alar
m
Alert Generated zero the timer
Compressor run time limit is ex-
ceeded
Filter filter_alarm Alert Generated
Automatic / reset
timer
DirtyFilter,supplyfanruntimeex-
ceeded, filter switch configuration
wrong.
Airside Linkage Alarm air_linkage_fail Alert Generated Automatic Linkage communication failed
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