Sensor Fault; Compressor Fault - Trane Symbio 700 Controller Application Manual

Troubleshooting

Sensor Fault

On Symbio™ 700, if a sensor value goes outside of its minimum or maximum range, the point goes into
an Alarm State. If the point in the Alarm State, we consider the sensor failed and take the following
actions:

Compressor Fault

Symbio™ 700 supports compressor safety functionality to keep the compressors from operating in an
undesirable condition. If a compressor safety failure occurs, the following actions occur:
46
Fault
Space Temperature Active
Discharge Air Temperature Local
Outdoor Air Temperature Active
Coil Temperature Sensor 1
Coil Temperature Sensor 2
Space Humidity Sensor
Space CO2 Sensor
Duct Static Pressure Local
Duct Static Pressure Local Lockout
Duct Static Pressure Limit Trip
Duct Static Pressure Limit Lockout
Symbio 700 Response
• Annunciated in the Active Alarm list.
• For specific unit operational response, see Space
Temperature Control (CVZT/VVZT) section of this
document.
• (VVDA) Loss of Space Temperature Active does not
shutdown unit operation; rather, disables specific
operating modes that require valid space
temperature.
• Annunciated in the Active Alarm list.
• For specific unit operational response, see Space
Temperature Control (CVZT/VVZT) section of this
document.
• (VVDA) Loss of Discharge Air Temperature Sensor
results in a loss of heating and cooling capacity.
• Annunciated in the Active Alarm list.
• Economizer cooling disabled.
• Annunciated in the Active Alarm list.
• If Outdoor Air Temperature < 52° F, Demand
Defrost will be disabled and timed defrost will be
used.
• Annunciated in the Active Alarm list.
• If Outdoor Air Temperature < 52°F, Demand Defrost
will be disabled and timed defrost will be used.
• Annunciated in the Active Alarm list.
• Space Dehumidification disabled.
• Comparative Enthalpy disabled.
• Annunciated in the Active Alarm list.
• Demand Controlled Ventilation disabled.
VVDA: Loss of Duct Static Pressure Sensor shall result
in a unit shutdown.
VVDA: Loss of Duct Static Pressure Sensor three times
within 1-hour shall result in a unit shutdown.
VVDA: The supply air static pressure exceeded the
Supply Air Static Pressure High Limit Setpoint. Supply
fan shall turn off (immediate shutdown) for 3 minutes
before being allowed to start.
VVDA: The supply air pressure has exceeded the Duct
Static Pressure High Limit Setpoint for the 3rd
consecutive time without the supply fan running for 3
continuous minutes. (If the fan runs for 3 continuous
minutes the counter will be reset.)
Response Type
Auto Reset
Auto Reset
Auto Reset
Auto Reset
Auto Reset
Auto Reset
Auto Reset
Auto Reset
Manual Reset
Auto Reset
Manual Reset
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