Start-Up and Shutdown
RTHD-SVX01K-EN 67
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.
Table 18. Limit conditions
Condition Description
Running- limited
The chiller, circuit, and compressor are currently running, but the operation of the chiller/compressor is being actively
limited by the controls. Further information is provided by the sub-mode.
Condenser Pressure
Limit
The circuit is experiencing condenser pressures at or near the condenser limit setting. The compressor will be unloaded
to prevent exceeding the limits.
Low Evaporator
Refrigerant
Temperature Inhibit
The circuit is experiencing saturated evaporator temperatures at or near the Low Refrigerant Temperature Cutout setting.
The compressors will be unloaded to prevent tripping.
Capacity Limited by
Low Liquid Level
The circuit is experiencing low refrigerant liquid levels and the EXV is at or near full open. The compressor will be unloaded
to prevent tripping.
Current Limit
The compressor is running and its capacity is being limited by high currents. The current limit setting is 100% RLA (to avoid
overcurrent trips).
Phase Unbalance
Limit
The compressor is running and its capacity is being limited by excessive phase current unbalance.
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