Sterling 30RA010-055 manual Operating Limitations

Page 75
Operating Limitations

COMPRESSOR OIL

SIGHT GLASS

Fig. 39 — Compressor Connections and Oil Sight Glass Location

5.Allow unit to operate and confirm that everything is func- tioning properly. Check to see that leaving fluid tempera- ture agrees with leaving set point (CSP.1 or CSP.2), or if reset is used, with the control point (CTPT) [Run Status, VIEW].

6.Check the cooler leaving chilled water temperature to see that it remains well above 32 F (0° C), or the brine freez- ing point if the unit is a medium temperature brine unit.

7.Recheck compressor oil level (see Check Oil Charge section).

Check Refrigerant Charge — All 30RA units are shipped with a complete operating charge of R-22 and should be under sufficient pressure to conduct a leak test after installa- tion. If there is no system pressure, admit nitrogen until a pres- sure is observed and then proceed to test for leaks. After leaks are repaired, the system must be dehydrated.

All refrigerant charging should be done through the ¼-in. Schraeder connection on the liquid line. Do NOT add refriger- ant charge through the low-pressure side of the system. If com- plete charging is required, weigh in the appropriate charge for the circuit as shown on the unit nameplate. If partial charging is required, operate circuit at full load and use an accurate tem- perature sensor on the liquid line as it enters the TXV. Use the Temperatures mode on the Scrolling Marquee display to show the circuit saturated condensing temperature (SCT.A or SCT.B). Charging is most accurate at saturated discharge tem- peratures of 120 to 125 F (49 to 52 C). Block condenser airflow as required to reach this temperature range. Add refrigerant un- til the system subcooling (SCT.A or SCT.B minus liquid line temperature entering TXV) is approximately 15 to 17 F (–9.4 to –8.3 C). Refrigerant VAPOR only may be added to a circuit through the 1/4-in. suction Schraeder connection on the com- pressor. This connection is located in line and to the left of the compressor junction box for the SM110 compressors and to the

lower right of the compressor junction box for all other com- pressor models.

Never charge liquid into low-pressure side of system. Do not overcharge. Overcharging results in higher discharge pressure, possible compressor damage, and higher power consumption. During charging or removal of refrigerant, be sure water is continuously circulating through the cooler to prevent freezing. Damage caused by freezing is considered abuse and may void the Sterling warranty.

Operating Limitations

TEMPERATURES (See Table 41 for 30RA Standard Tem- perature Limits)

Do not operate with cooler leaving chiller water (fluid) temperature (LCWT) below 40 F (4.4 C) for the standard units, or below 15 F (–9.4 C) for units factory built for medium temperature brine.

High Cooler Leaving Chilled Water (Fluid) Temperatures (LCWT) — During start-up with cooler LCWT above approx- imately 60 F (16 C), the unit expansion valve will limit suction pressure to approximately 90 psig (620 kPa) to avoid overload- ing the compressor.

Low Cooler LCWT — For standard units, the LCWT must be no lower than 40 F (4.4 C). If the unit is the factory-installed optional medium temperature brine unit, the cooler LCWT can go down to 15 F (–9.4 C).

75

Page 74 Page 76
Image 75
Page 74 Page 76
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 30RA010-018AQUA-SNAPLOW VOLTAGE CONTROL SCHEMATIC Fig. 3 - Wiring Schematic 30RA010-018contSEE NOTE SEE NOTE 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. 13 — Operating Envelope for R-22Maneurop CompressorFig. 14 — 30RA Condenser Fan Sequence 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 13 — Pressure Mode and Sub-ModeDirectory Table 14 — Set Point and Sub-ModeDirectoryTable 15 — Inputs Mode 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 TROUBLESHOOTINGTable 28 — Troubleshooting Recommended that system be filled with an approand fluid tubing 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 Main Base Board, J8 Connector Fig. 35 — Fluid-SideTemperature Sensors T1 and T2Fig. 36 — Thermistor Connections to PROGRAMMING Mode Table 37 - Fault Codes •P50: FAULT HISTORY — Last 8 faults•P51: SOFTWARE version PARAMETERS Table 39 — Replacement Modules System Check MAINTENANCEMinimum Loop Volume PRE-START-UPOperating Limitations OPERATION SEQUENCE Table 41 — Temperature Limits forStandard 30RA Units CIRCA_AN Circuit A Analog Parameters APPENDIX ASCN Tables A_UNIT General Unit Parameters CIRCADIO Circuit A Discrete Inputs/OutputsCIRCBDIO Circuit B Discrete Inputs/Outputs CIRCB_AN Circuit B Analog ParametersOPTIONS Unit Parameters BRODEFS Broadcast POC Definition Table ALARMDEF Alarm Definition TableDISPLAY Marquee Display SETUP DUALCHIL Dual Chiller Configuration SettingsOPTIONS2 Options 2 Configuration OPTIONS1 Options 1 ConfigurationSCHEDOVR Timed Override Setup RESETCON Temperature Reset and Demand LimitSETPOINT ALARMS: Maintenance Display UNITMAINTENANCE DUALCHIL: Maintenance Display CURRMODS: Maintenance DisplayLOADFACT: Maintenance Display LEARNFNS Maintenance DisplayPM-COIL:Maintenance Display PM-PUMP:Maintenance DisplayPM-STRN Maintenance Display RUNTEST: Maintenance Display STRTHOUR Maintenance Display TESTMODE: Maintenance DisplayVERSIONS: Maintenance Display WSMDEFME: Maintenance Display FACTORY SETTINGS FOR COMPRESSOR, FAN, PUMP APPENDIX BAND MANUAL STARTERS 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 Record Software Versions MODE — RUN STATUS COMMENTSCL-4 UNIT Configuration Settings OPTIONS1 Options ConfigurationIII.Unit Start-Upcont 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
Top Page Image Contents