Carrier Ecologic Series 3 Controls, Start-up, Operation, Service, And Troubleshooting

Also see for Ecologic 30GX080 Series: User manual Controls, start-up, operation, service, and troubleshooting

45TROUBLESHOOTINGThe 30GX,HX screw chiller control has many features toaid in troubleshooting. By using the keypad and display mod-ule and the Status function, operating conditions of the chillerare displayed while the unit is running. The Test functionallows for operational checkout of compressor loaders, fans,EXVs, solenoids, and other components while the chiller isstopped. The Service function displays how configurable itemsare configured and provides a manual control mode where thecompressors can be started and loaded. If an operating fault isdetected, an alarm is generated and an alarm code is displayedunder the subfunction along with an explanation ofthe fault. Up to 10 current alarm codes are stored under thissubfunction. For checking specific items, see Table 14.Checking Display Codes — To determine how themachine has been programmed to operate, check the diagnosticinformation displayed in the Status function and the configura-tion information displayed in the Service function.Unit Shutoff — To shut the unit off, move the LOCAL/OFF/REMOTE switch to OFF position. All compressors andsolenoids stop immediately.Complete Unit Stoppage — Complete unit stoppagecan be caused by any of the following conditions:• cooling load satisfied• remote on/off contacts open• programmed schedule• emergency stop command from CCN• general power failure• blown fuse in control power feed disconnect• open control circuit fuse(s)• LOCAL/OFF/REMOTE switch moved to OFF position• freeze protection trip• low flow protection trip• open contacts in chilled water flow switch (optional)• Open contacts in any auxiliary interlock. Terminals thatare jumpered from factory are in series with controlswitch. Opening the circuit between these terminals placesunit in Stop mode, similar to moving the control switch toOFF position. Unit cannot start if these contacts are open.If they open while unit is running, the unit stops• cooler entering or leaving fluid thermistor failure• low/high transducer supply voltage• loss of communications between processor module andother control modules• low refrigerant pressure• off-to-on delay is in effectSingle Circuit Stoppage — Single circuit stoppagecan be caused by the following:• low oil pressure• open contacts in high pressure switch• low refrigerant pressure• thermistor failure• transducer failure• alarm condition from CPM moduleStoppage of one circuit by a safety device action does notaffect other circuit. When a safety device trips, the circuit isshut down immediately and EXV closes.Restart Procedure — After the cause for stoppage hasbeen corrected, restart is either automatic or manual, dependingon the fault. Manual reset requires that the alarm(s) be reset viathe HSIO. Press and then to clear manualreset alarms. If the Alarm Reset Select feature is selected( ), a manual reset alarm can also be reset by switchingthe LOR switch from LOCAL/REMOTE to OFF and back toLOCAL/REMOTE again. If an alarm was from the CPM mod-ule, depress the reset button located on the control/fuse panelfor 5 seconds before clearing the alarm through the HSIO.Some typical fault conditions are described in Table 35. For acomplete list of fault conditions, codes, and reset type, seeTable 36.POWER FAILURE EXTERNAL TO THE UNIT — Unitrestarts automatically when power is restored.Table 35 — Typical Stoppage Faultsand Reset TypesAlarms and Alerts — These are warnings of abnormalor fault conditions, and may cause either one circuit (alert) orthe whole unit (alarm) to shut down. They are assigned codenumbers as described in Table 36. The alarm descriptions aredisplayed on the HSIO when the subfunction is en-tered. When a communication loss occurs to a hardware point,an alert or alarm may be generated. Refer to Table 37. ThePSIO also recognizes illegal configurations. Illegal configura-tions are shown in Table 38.When an alarm or alert is activated, the relay K3 (for 30GXunits) or K6 (for 30HX units) will close. See Field Wiring sec-tion on page 70 for wiring details.Table 36 contains a detailed description of each alarm andalert code error and possible cause.ALARM/ALERT RESET — Automatic alarms will resetwithout operator intervention if the condition corrects itself.One or more of the following methods must be used to resetmanual alarms:To reset PSIO alarms, first find and correct the cause of thealarm. Then from the HSIO press and toclear the alarm. If the Alarm Reset Select in is set to“1,” the default value, the LOCAL-OFF-REMOTE switch canbe switched from “Local” or “REMOTE” to “OFF” for 5 sec-onds and back to its original position to reset the alarm.If a stoppage occurs more than once as a result of any ofthe above safety devices, determine and correct thecause before attempting another restart.If a stoppage occurs more than once as a result of any ofthe preceding safety devices, determine and correct thecause before attempting another restart.STOPPAGE FAULT RESET TYPELoss of Condenser Flow (30HXC) Manual resetCooler Freeze Protection (ChilledFluid, Low Temperature)Auto reset first time, manual if repeatedin same dayCooler Fluid Pump Interlock Automatic reset (Manual for closedcontacts when pump is off)Control Circuit Fuse Blown Unit restarts automatically when poweris restoredHigh-Pressure Switch Open Manual resetLow Sat. Suction Temperature Manual resetLow Oil Pressure Manual resetLoss of Communications withWSM or FSM ControllerAutomatic resetLEGENDFSM — Flotronic™ System ManagerWSM — Water System ManagerENTERENTER