Sterling 30RA010-055 manual Operation Sequence, Temperature Limits for, Standard 30RA Units

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Table 41 — Temperature Limits for

Table 41 — Temperature Limits for

Standard 30RA Units

UNIT SIZE 30RA

010-030

032-055

Temperature

F

C

F

C

Maximum Ambient

120

49

120

49

Temperature

 

 

 

 

Minimum Ambient

45

7

32

0

2.Determine maximum deviation from average voltage:

(AB) 243 – 239 = 4 v (BC) 239 – 236 = 3 v (AC) 239 – 238 = 1 v

Maximum deviation is 4 v.

3.Determine percent voltage imbalance:

Temperature

 

 

 

 

Maximum Cooler EWT*

95

35

95

35

% Voltage Imbalance = 100 x

4

Maximum Cooler LWT

70

21

70

21

Minimum Cooler LWT†

40

4.4

40

4.4

LEGEND

EWT — Entering Fluid (Water) Temperature

LWT — Leaving Fluid (Water) Temperature

*For sustained operation, EWT should not exceed 85 F (29.4 C).

†Unit requires modification below this temperature.

LOW-AMBIENT OPERATION — If operating temperatures below 45 F (7 C) for sizes 010-030 or below 32 F (0° C) for sizes 032-055 are expected, accessory Motormaster® V con- trol must be installed. Refer to separate installation instructions for operation using this accessory. Contact your Sterling repre- sentative for details.

Brine duty application (below 40 F [4.4 C] LCWT) for chiller normally requires factory modification. Contact your Sterling representative for applicable LCWT range for standard water-cooled chiller in a specific application.

VOLTAGE — ALL UNITS

Main Power Supply — Minimum and maximum acceptable supply voltages are listed in the Installation Instructions.

Unbalanced 3-Phase Supply Voltage — Never operate a motor where a phase imbalance between phases is greater than 2%. To determine percent voltage imbalance:

 

max voltage deviation

% Voltage Imbalance = 100 x

from avg voltage

average voltage

 

The maximum voltage deviation is the largest difference between a voltage measurement across 2 legs and the average across all 3 legs.

Example: Supply voltage is 240-3-60. AB = 243 v

BC = 236 v AC = 238 v

1. Determine average voltage:

243 + 236 + 238

Average voltage =

3

=7173

=239

239

= 1.7%

This voltage imbalance is satisfactory as it is below the maximum allowable of 2%.

IMPORTANT: If the supply voltage phase imbalance is more than 2%, contact your local electric utility company immediately. Do not operate unit until imbalance condition is corrected.

Control Circuit Power — Power for the control circuit is supplied from the main incoming power through a factory- installed control power transformer (TRAN1) for all models. Field wiring connections are made to either terminal block TB5 or TB6.

OPERATION SEQUENCE

During unit off cycle, the control monitors the outdoor air temperature. If the ambient temperature drops below 40 F (4.4 C), cooler and hydronic system heaters (if either are facto- ry installed) are energized. If power is maintained to the chiller and the EMERGENCY ON/OFF switch is left in the OFF po- sition, these heaters are also energized.

The unit is started by putting the ENABLE/OFF/REMOTE CONTACT switch in the ENABLE or REMOTE CONTACT position. When the unit receives a call for cooling (either from the internal control or SCN network command or remote con- tact closure), the unit stages up in capacity to maintain the leav- ing fluid set point. The first compressor starts 11/2 to 3 minutes after the call for cooling.

The lead circuit can be specifically designated on all models or selected based on compressor run hours and starts depend- ing on field configuration. The unit control will override this selection under certain starting conditions to properly maintain oil return to the compressors. In general, on dual compressor circuits, the control will most often start the A1 or B1 compres- sor first, especially after long off periods. The MBB controls fan stages to maintain the head pressure set point and will auto- matically adjust unit capacity as required to keep compressors from operating outside of the specified envelope. There are no pumpout or pumpdown sequences on these chillers.

For all units, if temperature reset is being used, the unit con- trols to a higher leaving-fluid temperature as the building load reduces. If demand limit is used, the unit may temporarily be unable to maintain the desired leaving-fluid temperature be- cause of imposed power limitations. Loading sequence for compressors is shown in Tables 6 and 7.

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Contents SAFETY CONSIDERATIONS CONTENTS GENERALMAJOR SYSTEM COMPONENTS Control Module CommunicationSterlco Comfort Network SCN Interface — Table 1 — Unit SizesTable 3 — Status Switches Table 5 - SCN Communication Bus WiringTable 2 — Thermistor Designations Table 4 - Output RelaysLEGEND FOR FIG. Page Page Fig. 3 — Wiring Schematic 30RA010-018 30RA010-018AQUA SNAPFig. 3 - Wiring Schematic 30RA010-018cont AQUA-SNAPLOW VOLTAGE CONTROL SCHEMATICSEE NOTE SEE NOTE Fig. 4 - Wiring Schematic 30RA022-030 30RA022-030AQUA SNAPFig. 4 - Wiring Schematic 30RA022-030cont AQUA-SNAPLOW VOLTAGE CONTROL SCHEMATICFig. 5 — Wiring Schematic 30RA032-040 30RA032-040AQUA SNAPFig. 5 — Wiring Schematic 30RA032-040cont AQUA-SNAPLOW VOLTAGE CONTROL SCHEMATICFig. 6 — Wiring Schematic 30RA042-055 30RA042-055AQUA SNAPFig. 6 — Wiring Schematic 30RA042-055cont AQUA-SNAPLOW VOLTAGE CONTROL SCHEMATICFig. 7 — Main Base Board ESCAPEENTERREMOTE CONTACT SW1 OFF ENABLE OFF SW2 ON MODEFig. 9 — Typical Space Temperature Sensor Wiring Fig. 11 - Energy Management Module CEPL130351100/100 Fig. 12 — Deadband Multiplier R-22Maneurop Compressor Fig. 13 — Operating Envelope forFig. 14 — 30RA Condenser Fan Sequence Cooling Set Point Select Service Test See Table 11 — Both main power and control circuit power must be onTable 8 — Control Methods and Cooling Set Points Fig. 16 — Scrolling Marquee DisplayOptional Factory-InstalledHydronic Package — •Cooler Pump Control CPC Configuration, OPT1 ON Fig. 17 — Dual Chiller Thermistor Location Table 9 — Marquee Display Menu StructureTable 10 — Run Status Mode and Sub-ModeDirectory SUB-MODE Table 12 - Temperature Mode and Sub-ModeDirectory Table 14 — Set Point and Sub-ModeDirectory Table 13 — Pressure Mode and Sub-ModeDirectoryTable 15 — Inputs Mode and Sub-ModeDirectory Table 16 — Outputs Mode and Sub-ModeDirectory SUB-MODEKEYPAD DISPLAYSUB-MODE KEYPADITEM DISPLAYSUB-MODE KEYPADITEM DISPLAYTable 18 — Time Clock Mode and Sub-ModeDirectory PER.3 SUB-MODE Table 20 — Alarms Mode and Sub-ModeDirectory Table 19 — Operating Mode and Sub-ModeDirectorySUB-MODE ITEMKEYPAD ENTRY DISPLAYRSET DISP Table 23 — Operating Modes Table 24 — Example of Reading and Clearing Alarms Table 25A — 4-20mA ResetTable 26B — Configuring Return Temperature Reset Fig. 18 — Standard Chilled Fluid Temperature Control — No ResetFig. 19 — Outdoor-AirTemperature Reset Fig. 20 — Space Temperature ResetFig. 21A — 4- to 20-mADemand Limiting Fig. 21B — Cooling Set Point 4 to 20 mATROUBLESHOOTING Table 27 — Configuring Demand LimitRecommended that system be filled with an appro Table 28 — Troubleshootingand fluid tubing Fig. 22 — Component Arrangement — 30RA010-030 FU — Fuse GND — GroundFig. 23 — Component Arrangement — 30RA032-040 FU — Fuse GND — GroundFig. 24 — Component Arrangement — 30RA042-055 FU — Fuse GND — GroundNOTES LEGEND Table 29 — Alarm and Alert Codes Table 29 - Alarm and Alert Codes cont Table 29 — Alarm and Alert Codes cont ALARMTable 29 — Alarm and Alert Codes cont ALARMTable 29 — Alarm and Alert Codes cont ALARMSERVICE Compressor Replacement Refer to FigTable 30 - Unit Torque Specification Electronic ComponentsFig. 28 — Compressor Wiring Fig. 27 — Typical Compressor Mounting — All SizesFig. 29 — Compressor Location — 30RA010-030 Fig. 30 — Compressor Location — 30RA032-055Condenser Section and Coils Table 31 - Oil ChargeFig. 31 — 30RA Access Panels Check Refrigerant Feed ComponentsFig. 32 — Condenser-FanMounting Fig. 33 — Condenser-FanPosition Standard FanTable 32 — Factory Settings, High-Pressure Switch FixedCompressor and Unit Protective Devices Check Unit SafetiesCOOLER FREEZE-UPPROTECTION TEMP TEMP For Thermistor T10 For Thermistor T10 Fig. 35 — Fluid-SideTemperature Sensors T1 and T2 Main Base Board, J8 ConnectorFig. 36 — Thermistor Connections to PROGRAMMING Mode •P50: FAULT HISTORY — Last 8 faults Table 37 - Fault Codes•P51: SOFTWARE version PARAMETERS Table 39 — Replacement Modules MAINTENANCE Minimum Loop VolumePRE-START-UP System CheckOperating Limitations Table 41 — Temperature Limits for OPERATION SEQUENCEStandard 30RA Units APPENDIX A SCN Tables A_UNIT General Unit ParametersCIRCADIO Circuit A Discrete Inputs/Outputs CIRCA_AN Circuit A Analog ParametersCIRCB_AN Circuit B Analog Parameters CIRCBDIO Circuit B Discrete Inputs/OutputsOPTIONS Unit Parameters ALARMDEF Alarm Definition Table DISPLAY Marquee Display SETUPDUALCHIL Dual Chiller Configuration Settings BRODEFS Broadcast POC Definition TableOPTIONS1 Options 1 Configuration OPTIONS2 Options 2 ConfigurationRESETCON Temperature Reset and Demand Limit SCHEDOVR Timed Override SetupSETPOINT UNIT ALARMS: Maintenance DisplayMAINTENANCE CURRMODS: Maintenance Display DUALCHIL: Maintenance DisplayLEARNFNS Maintenance Display LOADFACT: Maintenance DisplayPM-PUMP:Maintenance Display PM-COIL:Maintenance DisplayPM-STRN Maintenance Display RUNTEST: Maintenance Display TESTMODE: Maintenance Display STRTHOUR Maintenance DisplayVERSIONS: Maintenance Display WSMDEFME: Maintenance Display APPENDIX B FACTORY SETTINGS FOR COMPRESSOR, FAN, PUMPAND MANUAL STARTERS AND MANUAL STARTERS cont FACTORY SETTINGS FOR COMPRESSOR, FAN, PUMPAPPENDIX C DataPort, DataLink, BAClink Object DefinitionOPTIONS SETPOINTSTART-UPCHECKLIST FOR 30RA LIQUID CHILLER Remove and use for Job File I.Project InformationII. Preliminary Equipment Check Design InformationIII. Unit Start-Up Start and Operate Machine. Complete the FollowingCL-3 COMMENTS Record Software Versions MODE — RUN STATUSCL-4 OPTIONS1 Options Configuration UNIT Configuration SettingsIII.Unit Start-Upcont OPTIONS2 Options Configuration RSET Reset Configuration SettingsIII.Unit Start-Upcont CL-6SLCT Setpoint and Ramp Load Configuration III.Unit Start-UpcontSETPOINT CL-7Service Test Mode and Sub-ModeDirectory III.Unit Start-Upcont
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