Sterling 30RA010-055 manual Typical Space Temperature Sensor Wiring

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Fig. 9 — Typical Space Temperature

SPT (T10) PART NO. 33ZCT55SPT

 

SENSOR

SEN

TB5

SEN

 

5

 

6

Fig. 9 — Typical Space Temperature

Sensor Wiring

 

 

T-55 SPACE

 

 

SENSOR

 

 

6

 

SCN+

5

TO SCN

SCN GND

4

COMM 1

 

 

BUS (PLUG)

 

3

AT UNIT

 

 

 

SCN-

2

 

 

1

Fig. 10 — SCN Communications Bus Wiring to Optional Space Sensor RJ11 Connector

Energy Management Module (Fig. 11) — This factory-installed option (FIOP) or field-installed accessory is used for the following types of temperature reset, demand limit, and/or ice features:

•4 to 20 mA leaving fluid temperature reset (requires field-supplied 4 to 20 mA generator)

•4 to 20 mA cooling set point reset (requires field- supplied 4 to 20 mA generator)

•Discrete inputs for 2-step demand limit (requires field- supplied dry contacts capable of handling a 24 vac, 50 mA load)

•4 to 20 mA demand limit (requires field-supplied 4 to 20 mA generator)

•Discrete input for Ice Done switch (requires field- supplied dry contacts capable of handling a 24 vac, 50 mA load)

See Demand Limit and Temperature Reset sections on pages 44 and 43 for further details.

Care should be taken when interfacing with other manufac- turer’s control systems due to possible power supply differences, full wave bridge versus half wave rectification. The two different power supplies cannot be mixed. ComfortLink™ controls use half wave rectification. A signal isolation device should be utilized if a full wave bridge signal generating device is used.

Loss-of-Cooler Flow Protection — A proof-of-cooler flow device is factory installed in all chillers. It is recommended that proper operation of the switch be verified on a regular basis.

Thermostatic Expansion Valves (TXV) — All units are equipped from the factory with conventional TXVs. Each

refrigeration circuit is also supplied with a factory-installed liquid line filter drier and sight glass.

The TXV is set at the factory to maintain approximately 8 to 12° F (4.4 to 6.7° C) suction superheat leaving the cooler by metering the proper amount of refrigerant into the cooler. All TXVs are adjustable, but should not be adjusted unless absolutely necessary.

The TXV is designed to limit the cooler saturated suction temperature to 55 F (12.8 C). This makes it possible for unit to start at high cooler fluid temperatures without overloading the compressor.

Capacity Control — The control system cycles com- pressors, and minimum load valve solenoids (if equipped) to maintain the user-configured leaving chilled fluid temperature set point. Entering fluid temperature is used by the Main Base Board (MBB) to determine the temperature drop across the cooler and is used in determining the optimum time to add or subtract capacity stages. The chilled fluid temperature set point can be automatically reset by the return fluid temperature, space, or outdoor-air temperature reset features. It can also be reset from an external 4 to 20-mA signal (requires Energy Management Module FIOP or accessory).

The control has an automatic lead-lag feature built in which determines the wear factor (combination of starts and run hours) for each compressor. If all compressors are off and less than 30 minutes has elapsed since the last compressor was turned off, the wear factor is used to determine which compres- sor to start next. If no compressors have been running for more than 30 minutes and the leaving fluid temperature is greater than the saturated condensing temperature, the wear factor is still used to determine which compressor to start next. If the leaving fluid temperature is less than the saturated condensing temperature, then the control will start either compressor A1 or compressor B1 first, depending on the user-configurable circuit lead-lag value.

The TXVs will provide a controlled start-up. During start- up, the low pressure logic will be bypassed for 21/2 minutes to allow for the transient changes during start-up. As additional stages of compression are required, the processor control will add them. See Table 6 and 7.

If a circuit is to be stopped, the compressor with the lowest wear factor will be shut off first in most cases. Certain override conditions may shut off the smaller of two compressors on a circuit first.

The capacity control algorithm runs every 30 seconds. The algorithm attempts to maintain the Control Point at the desired set point. Each time it runs, the control reads the entering and leaving fluid temperatures. The control determines the rate at which conditions are changing and calculates 2 variables based on these conditions. Next, a capacity ratio is calculated using the 2 variables to determine whether or not to make any changes to the current stages of capacity. This ratio value ranges from –100 to +100%. If the next stage of capacity is a compressor, the control starts (stops) a compressor when the ratio reaches +100% (–100%). If installed, the minimum load valve solenoid will be energized with the first stage of capacity. Minimum load valve value is a fixed 30% in the total capacity calculation. The control will also use the minimum load valve solenoid as the last stage of capacity before turning off the last compressor. If the close control feature (CLS.C) [Configura- tion, OPT2] is enabled the control will use the minimum load valve solenoid whenever possible to fine tune leaving fluid temperature control. A delay of 90 seconds occurs after each capacity step change. Refer to Tables 6 and 7.

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Contents SAFETY CONSIDERATIONS GENERAL CONTENTSControl Module Communication MAJOR SYSTEM COMPONENTSSterlco Comfort Network SCN Interface — Table 1 — Unit SizesTable 5 - SCN Communication Bus Wiring Table 3 — Status SwitchesTable 2 — Thermistor Designations Table 4 - Output RelaysLEGEND 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 30RA042-055contESCAPEENTER Fig. 7 — Main Base BoardREMOTE CONTACT SW1 OFF ENABLE OFF SW2 ON MODEFig. 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 and control circuit power must be on Service Test See Table 11 — Both main powerTable 8 — Control Methods and Cooling Set Points Fig. 16 — Scrolling Marquee DisplayOptional 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 SUB-MODE Table 16 — Outputs Mode and Sub-ModeDirectoryKEYPAD DISPLAYKEYPAD SUB-MODEITEM DISPLAYKEYPAD SUB-MODEITEM DISPLAYTable 18 — Time Clock Mode and Sub-ModeDirectory PER.3 SUB-MODE Table 19 — Operating Mode and Sub-ModeDirectory Table 20 — Alarms Mode and Sub-ModeDirectoryITEM SUB-MODEKEYPAD ENTRY DISPLAYRSET DISP Table 23 — Operating Modes Table 25A — 4-20mA Reset Table 24 — Example of Reading and Clearing AlarmsTable 26B — Configuring Return Temperature Reset Temperature Control — No Reset Fig. 18 — Standard Chilled FluidFig. 19 — Outdoor-AirTemperature Reset Fig. 20 — Space Temperature 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 contCompressor Replacement Refer to Fig SERVICETable 30 - Unit Torque Specification Electronic ComponentsFig. 27 — Typical Compressor Mounting — All Sizes Fig. 28 — Compressor WiringFig. 29 — Compressor Location — 30RA010-030 Fig. 30 — Compressor Location — 30RA032-055Table 31 - Oil Charge Condenser Section and CoilsCheck Refrigerant Feed Components Fig. 31 — 30RA Access PanelsFig. 32 — Condenser-FanMounting Fig. 33 — Condenser-FanPosition Standard FanSwitch Fixed Table 32 — Factory Settings, High-PressureCompressor and Unit Protective Devices Check Unit SafetiesCOOLER 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 Minimum Loop Volume MAINTENANCEPRE-START-UP System CheckOperating Limitations Standard 30RA Units OPERATION SEQUENCETable 41 — Temperature Limits for SCN Tables A_UNIT General Unit Parameters APPENDIX ACIRCADIO Circuit A Discrete Inputs/Outputs CIRCA_AN Circuit A Analog ParametersOPTIONS Unit Parameters CIRCBDIO Circuit B Discrete Inputs/OutputsCIRCB_AN Circuit B Analog Parameters DISPLAY Marquee Display SETUP ALARMDEF Alarm Definition TableDUALCHIL Dual Chiller Configuration Settings BRODEFS Broadcast POC Definition TableOPTIONS2 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 OPTIONSRemove and use for Job File I.Project Information START-UPCHECKLIST FOR 30RA LIQUID CHILLERII. Preliminary Equipment Check Design InformationStart 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 RSET Reset Configuration Settings OPTIONS2 Options ConfigurationIII.Unit Start-Upcont CL-6III.Unit Start-Upcont SLCT Setpoint and Ramp Load ConfigurationSETPOINT CL-7III.Unit Start-Upcont Service Test Mode and Sub-ModeDirectory
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