Sterling 30RA010-055 manual Troubleshooting, Recommended that system be filled with an appro

Page 47

Table 28 — Troubleshooting

SYMPTOMS

CAUSE

REMEDY

Cooler Circulating Pump Does

Power line open

Reset circuit breaker.

Not Run

Control fuse or circuit breaker open

Check control circuit for ground or short. Reset

 

 

 

breaker and replace fuse.

 

Compressor over temperature sensor open (06D)

Find cause of high temperature and reset controls.

 

Tripped power breaker

Check the controls. Find the cause of trip and reset

 

 

breaker.

 

Cooler circulating pump not running

Power off — restart.

 

 

Pump binding — free pump.

 

 

Incorrect wiring —rewire.

 

 

Pump motor burned out — replace.

 

Loose terminal connection

Check connections.

 

Improperly wired controls

Check wiring and rewire if necessary.

 

Low line voltage

Check line voltage — determine location of

 

 

voltage drop and remedy deficiency.

 

Compressor motor defective

Check motor winding for open or short.

 

 

Replace compressor if necessary.

 

Seized compressor

Replace compressor.

Compressor Cycles

Loss of charge control erratic in action

Repair leak and recharge.

Off on Loss of Charge

 

 

 

Replace control.

 

 

 

Low refrigerant charge

Add refrigerant.

 

Low suction temperature

Raise cooler leaving fluid temperature set point.

Compressor Cycles Off on Out

Thermistor failure

Replace thermistor.

of Range Condition

System load was reduced faster than controller

Unit will restart after fluid temperature rises back into

 

 

could remove stages

the control band. Avoid rapidly removing system

 

 

load.

 

Temperature controller deadband setting is too low

Raise deadband setting.

Compressor Shuts Down on

High-pressure control acting erratically

Replace control.

High-Pressure Control

 

 

Compressor discharge valve partially closed

Open valve or replace (if defective).

 

 

Noncondensables in system

Purge system.

 

Condenser scaled/dirty

Clean condenser.

 

Condenser water pump or fans not operating

Start pump — repair or replace if defective.

 

System overcharged with refrigerant

Reduce charge.

Unit Operates Too Long

Low refrigerant charge

Add refrigerant.

or Continuously

 

 

Control contacts fused

Replace control.

 

 

Air in system

Purge system.

 

Partially plugged or plugged expansion valve or filter

Clean or replace as needed.

 

drier

 

 

Defective insulation

Replace or repair as needed.

 

Service load

Keep doors and windows closed.

 

Inefficient compressor

Check valves, and replace if necessary.

Unusual or Loud System

Piping vibration

Support piping as required.

Noises

 

 

 

Check for loose pipe connections

 

 

 

Expansion valve hissing

Add refrigerant.

 

 

Check for plugged liquid line filter drier.

 

Compressor noisy

Replace compressor (worn bearings).

 

 

Check for loose compressor holddown bolts.

Compressor Loses Oil

Leak in system

Repair leak.

 

Mechanical damage (Failed seals or broken scrolls)

Replace compressor.

 

Oil trapped in line

Check piping for oil traps.

Hot Liquid Line

Shortage of refrigerant due to leak

Repair leak and recharge.

Frosted Liquid Line

Shutoff valve partially closed or restricted

Open valve or remove restriction.

 

Restricted filter drier

Replace filter drier.

Frosted Suction Line

Expansion valve admitting excess refrigerant (note:

Adjust expansion valve. Replace valve if defective.

 

this is a normal condition for brine applications)

 

Freeze-Up

Improper charging

Make sure a full quantity of fluid is flowing through

 

 

the cooler while charging, and suction pressure in

 

 

cooler is equal to or greater than pressure corre-

 

 

sponding to 32 F (0° C) (58 psig [400 kPa] for

 

 

Refrigerant 22).

 

System not drained for winter shutdown

Recommended that system be filled with an appro-

 

 

priate glycol mixture to prevent freezing of pumps

 

 

and fluid tubing.

 

Loose Thermistor

Verify thermistors are fully inserted in wells.

47

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Contents SAFETY CONSIDERATIONS GENERAL CONTENTSTable 1 — Unit Sizes MAJOR SYSTEM COMPONENTSControl Module Communication Sterlco Comfort Network SCN Interface —Table 4 - Output Relays Table 3 — Status SwitchesTable 5 - SCN Communication Bus Wiring Table 2 — Thermistor DesignationsLEGEND FOR FIG. Page Page 30RA010-018AQUA SNAP Fig. 3 — Wiring Schematic 30RA010-018SEE NOTE SEE NOTE AQUA-SNAPLOW VOLTAGE CONTROL SCHEMATICFig. 3 - Wiring Schematic 30RA010-018cont 30RA022-030AQUA SNAP Fig. 4 - Wiring Schematic 30RA022-030AQUA-SNAPLOW VOLTAGE CONTROL SCHEMATIC Fig. 4 - Wiring Schematic 30RA022-030cont30RA032-040AQUA SNAP Fig. 5 — Wiring Schematic 30RA032-040AQUA-SNAPLOW VOLTAGE CONTROL SCHEMATIC Fig. 5 — Wiring Schematic 30RA032-040cont30RA042-055AQUA SNAP Fig. 6 — Wiring Schematic 30RA042-055AQUA-SNAPLOW VOLTAGE CONTROL SCHEMATIC Fig. 6 — Wiring Schematic 30RA042-055contMODE Fig. 7 — Main Base BoardESCAPEENTER REMOTE CONTACT SW1 OFF ENABLE OFF SW2 ONFig. 9 — Typical Space Temperature Sensor Wiring CEPL130351 Fig. 11 - Energy Management Module100/100 Fig. 12 — Deadband Multiplier Fig. 14 — 30RA Condenser Fan Sequence Fig. 13 — Operating Envelope forR-22Maneurop Compressor Cooling Set Point Select Fig. 16 — Scrolling Marquee Display Service Test See Table 11 — Both main powerand control circuit power must be on Table 8 — Control Methods and Cooling Set PointsOptional Factory-InstalledHydronic Package — •Cooler Pump Control CPC Configuration, OPT1 ON Table 9 — Marquee Display Menu Structure Fig. 17 — Dual Chiller Thermistor LocationTable 10 — Run Status Mode and Sub-ModeDirectory SUB-MODE Table 12 - Temperature Mode and Sub-ModeDirectory Table 15 — Inputs Mode and Sub-ModeDirectory Table 13 — Pressure Mode and Sub-ModeDirectoryTable 14 — Set Point and Sub-ModeDirectory DISPLAY Table 16 — Outputs Mode and Sub-ModeDirectorySUB-MODE KEYPADDISPLAY SUB-MODEKEYPAD ITEMDISPLAY SUB-MODEKEYPAD ITEMTable 18 — Time Clock Mode and Sub-ModeDirectory PER.3 SUB-MODE Table 19 — Operating Mode and Sub-ModeDirectory Table 20 — Alarms Mode and Sub-ModeDirectoryDISPLAY SUB-MODEITEM KEYPAD ENTRYRSET DISP Table 23 — Operating Modes Table 25A — 4-20mA Reset Table 24 — Example of Reading and Clearing AlarmsTable 26B — Configuring Return Temperature Reset Fig. 20 — Space Temperature Reset Fig. 18 — Standard Chilled FluidTemperature Control — No Reset Fig. 19 — Outdoor-AirTemperature ResetFig. 21B — Cooling Set Point 4 to 20 mA Fig. 21A — 4- to 20-mADemand LimitingTable 27 — Configuring Demand Limit TROUBLESHOOTINGand fluid tubing Table 28 — TroubleshootingRecommended that system be filled with an appro FU — Fuse GND — Ground Fig. 22 — Component Arrangement — 30RA010-030FU — Fuse GND — Ground Fig. 23 — Component Arrangement — 30RA032-040FU — Fuse GND — Ground Fig. 24 — Component Arrangement — 30RA042-055NOTES LEGEND Table 29 — Alarm and Alert Codes Table 29 - Alarm and Alert Codes cont ALARM Table 29 — Alarm and Alert Codes contALARM Table 29 — Alarm and Alert Codes contALARM Table 29 — Alarm and Alert Codes contElectronic Components SERVICECompressor Replacement Refer to Fig Table 30 - Unit Torque SpecificationFig. 30 — Compressor Location — 30RA032-055 Fig. 28 — Compressor WiringFig. 27 — Typical Compressor Mounting — All Sizes Fig. 29 — Compressor Location — 30RA010-030Table 31 - Oil Charge Condenser Section and CoilsFig. 33 — Condenser-FanPosition Standard Fan Fig. 31 — 30RA Access PanelsCheck Refrigerant Feed Components Fig. 32 — Condenser-FanMountingCheck Unit Safeties Table 32 — Factory Settings, High-PressureSwitch Fixed Compressor and Unit Protective DevicesCOOLER FREEZE-UPPROTECTION TEMP TEMP For Thermistor T10 For Thermistor T10 Fig. 36 — Thermistor Connections to Main Base Board, J8 ConnectorFig. 35 — Fluid-SideTemperature Sensors T1 and T2 PROGRAMMING Mode •P51: SOFTWARE version Table 37 - Fault Codes•P50: FAULT HISTORY — Last 8 faults PARAMETERS Table 39 — Replacement Modules System Check MAINTENANCEMinimum Loop Volume PRE-START-UPOperating Limitations Standard 30RA Units OPERATION SEQUENCETable 41 — Temperature Limits for CIRCA_AN Circuit A Analog Parameters APPENDIX ASCN Tables A_UNIT General Unit Parameters CIRCADIO Circuit A Discrete Inputs/OutputsOPTIONS Unit Parameters CIRCBDIO Circuit B Discrete Inputs/OutputsCIRCB_AN Circuit B Analog Parameters BRODEFS Broadcast POC Definition Table ALARMDEF Alarm Definition TableDISPLAY Marquee Display SETUP DUALCHIL Dual Chiller Configuration SettingsOPTIONS2 Options 2 Configuration OPTIONS1 Options 1 ConfigurationSETPOINT SCHEDOVR Timed Override SetupRESETCON Temperature Reset and Demand Limit MAINTENANCE ALARMS: Maintenance DisplayUNIT DUALCHIL: Maintenance Display CURRMODS: Maintenance DisplayLOADFACT: Maintenance Display LEARNFNS Maintenance DisplayPM-STRN Maintenance Display PM-COIL:Maintenance DisplayPM-PUMP:Maintenance Display RUNTEST: Maintenance Display VERSIONS: Maintenance Display STRTHOUR Maintenance DisplayTESTMODE: Maintenance Display WSMDEFME: Maintenance Display AND MANUAL STARTERS FACTORY SETTINGS FOR COMPRESSOR, FAN, PUMPAPPENDIX B FACTORY SETTINGS FOR COMPRESSOR, FAN, PUMP AND MANUAL STARTERS contDataPort, DataLink, BAClink Object Definition APPENDIX CSETPOINT OPTIONSDesign Information START-UPCHECKLIST FOR 30RA LIQUID CHILLERRemove and use for Job File I.Project Information II. Preliminary Equipment CheckStart and Operate Machine. Complete the Following III. Unit Start-UpCL-3 CL-4 Record Software Versions MODE — RUN STATUSCOMMENTS III.Unit Start-Upcont UNIT Configuration SettingsOPTIONS1 Options Configuration CL-6 OPTIONS2 Options ConfigurationRSET Reset Configuration Settings III.Unit Start-UpcontCL-7 SLCT Setpoint and Ramp Load ConfigurationIII.Unit Start-Upcont SETPOINTIII.Unit Start-Upcont Service Test Mode and Sub-ModeDirectory
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