Limit Conditions - Trane Optimus RTHD Installation, Operation And Maintenance Manual

Limit Conditions

Symbio™ 800 will automatically limit certain operating parameters during startup and run modes to maintain optimum
chiller performance and prevent nuisance diagnostic trips. These limit conditions are noted in
Table 18. Limit conditions
Condition Description
The chiller, circuit, and compressor are currently running, but the operation of the chiller/compressor is being actively
Running- limited
limited by the controls. Further information is provided by the sub-mode.
Condenser Pressure The circuit is experiencing condenser pressures at or near the condenser limit setting. The compressor will be unloaded
Limit to prevent exceeding the limits.
Low Evaporator
The circuit is experiencing saturated evaporator temperatures at or near the Low Refrigerant Temperature Cutout setting.
Refrigerant
The compressors will be unloaded to prevent tripping.
Temperature Inhibit
Capacity Limited by The circuit is experiencing low refrigerant liquid levels and the EXV is at or near full open. The compressor will be unloaded
Low Liquid Level to prevent tripping.
The compressor is running and its capacity is being limited by high currents. The current limit setting is 100% RLA (to avoid
Current Limit
overcurrent trips).
Phase Unbalance
The compressor is running and its capacity is being limited by excessive phase current unbalance.
Limit
RTHD-SVX01K-EN
Start-Up and Shutdown
Table 18.
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