Table 23 – Troubleshooting Alarms
| BACnet | ACTION TAKEN BY | RESET |
| |
POINT NAME | OBJECT | PROBABLE CAUSE | |||
CONTROL | METHOD | ||||
| NAME |
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| Alarm Generated |
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Safety Chain Alarm | safety_chain | Immediate | Automatic | Over load Indoor Fan or Electric Heater overheat. | |
|
| Shutdown |
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| |
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| Alarm Generated |
| Smoke detected by smoke detector or | |
Fire Shutdown Alarm | fire_alarm | Immediate | Automatic | ||
configuration incorrect | |||||
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| Shutdown |
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Space Temp Sensor |
| Alarm Generated |
| Faulty, shorted, or open thermistor caused by | |
spt_alarm | Immediate | Automatic | |||
Failure | wiring error or loose connection. | ||||
| Shutdown |
| |||
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| |
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| Alarm Generated |
| Faulty, shorted, or open thermistor caused by | |
SAT Sensor Alarm | sat_alarm | Immediate | Automatic | ||
wiring error or loose connection. | |||||
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| Shutdown |
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High Space Temp Alarm | spt_hi | Alarm Generated | Automatic | The space temperature has risen above the cool | |
setpoint by more than the desired amount. | |||||
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Low Space Temp Alarm | spt_lo | Alarm Generated | Automatic | The space temperature has dropped below the | |
heat setpoint by more than the desired amount. | |||||
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High Supply Air Temp | sat_hi | Alarm Generated | Automatic | SAT is greater then 160 degrees for more than 5 | |
minutes. | |||||
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Low Supply Air Temp | sat_lo | Alarm Generated | Automatic | The supply air temperature is below 35_F for | |
more than 5 minutes. | |||||
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Supply Fan Failed to |
| Alarm Generated |
| Tripped Circuit Breaker, Broken belt, Bad indoor | |
sf_fail | Immediately | Automatic | fan motor, Configuration incorrect, Bad fan status | ||
Start | |||||
| disable Operation |
| switch. | ||
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| Alarm Generated |
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Supply Fan in Hand | sf_hand | Ramp down | Automatic | Bad Fan Status Switch, Configuration incorrect. | |
|
| Operations |
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Compressor Safety | dx_compstat | Alarm Generated | Automatic | Compressor would not start. | |
Alarm | |||||
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Setpoint Slider Alarm | slide_alarm | Alarm Generated | Automatic | STO sensor is open or shorted for more then 5 | |
Offset set to zero | seconds. | ||||
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| Automatic/re |
| |
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| set timer |
| |
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| when | Dirty Filter, supply fan run time exceeded, filter | |
Dirty Filter Alarm | filter | Alarm Generated | configured | ||
switch configuration wrong. | |||||
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| with or | ||
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| without |
| |
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| switch |
| |
Switch Configuration |
| Alarm Generated | Configure | More than one binary input is configured for the | |
| Disable | ||||
sw_cfg_alarm | same purpose. More then one discrete input is | ||||
Alarm | misconfigured switch | correctly | |||
| configured to provide the same function. | ||||
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| functions |
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Misconfigured Analog |
| Alarm Generated | Configure | More then one analog input is configured to | |
an_cfg_alarm | Disable 4 selectable | ||||
Input | correctly | provide the same function. | |||
| analog inputs | ||||
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| Alarm Generated |
| Faulty, shorted, or open thermistor caused by | |
OAT Sensor Alarm | oat_alarm | Economizer and Low | Automatic | ||
ambient DX cooling | wiring error or loose connection. | ||||
|
|
| |||
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| lockout disabled. |
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| |
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| Alarm Generated |
| Sensor reading is out of range. Bad sensor, bad | |
Space RH Sensor Alarm | sprh_alarm | Dehumidification | Automatic | ||
wiring, or sensor configured incorrectly. | |||||
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| disabled |
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Outdoor RH Sensor | oarh_alarm | Alarm Generated | Automatic | Sensor reading is out of range. Bad sensor, bad | |
Alarm | wiring, or sensor configured incorrectly. | ||||
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High Space Humidity | sprh_hi | Alarm Generated | Automatic | IRH is greater then 70% for more then 10 | |
minutes. | |||||
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Low Space Humidity | sprh_lo | Alarm Generated | Automatic | IRH is less then 35% for more then 10 minutes. | |
|
| Alarm Generated |
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| |
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| Disables IAQ |
| Sensor reading is out of range. Bad sensor, bad | |
IAQ Sensor Alarm | iaq_alarm | Operation | Automatic | ||
wiring, or sensor configured incorrectly. | |||||
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| Economizer moves |
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| to minimum position |
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OAQ Sensor Alarm | oaq_alarm | Alarm Generated Set | Automatic | Sensor reading is out of range. Bad sensor, bad | |
OAQ to 400 | wiring, or sensor configured incorrectly. | ||||
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High Carbon Dioxide | co2_hi | Alarm Generated | Automatic | CO2 reading is above 1200ppm. | |
Level | |||||
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Supply Fan Runtime | sf_rntm | Alarm Generated | clear the | Supply fan run time exceeded user defined limit. | |
Alarm | timer | ||||
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Compressor 1 Runtime | dx1_rntm | Alarm Generated | clear the | Compressor run time limit is exceeded. | |
Alarm | timer | ||||
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Compressor 2 Runtime | dx2_rntm | Alarm Generated | clear the | Compressor run time limit is exceeded. | |
Alarm | timer | ||||
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48TC
53