Sterling 30RA010-055 Thermistor Designations, Status Switches, Output Relays, Operating Data

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Table 2 — Thermistor Designations

At each system element, the shields of its communication bus cables must be tied together. If the communication bus is entirely within one building, the resulting continuous shield must be connected to a ground at one point only. If the commu- nication bus cable exits from one building and enters another, the shields must be connected to grounds at the lightning suppressor in each building where the cable enters or exits the building (one point per building only). To connect the unit to the network:

1.Turn off power to the control box.

2.Cut the SCN wire and strip the ends of the red (+), white (ground), and black (–) conductors. (Substitute appropri- ate colors for different colored cables.)

3.Connect the red wire to (+) terminal on TB3 of the plug, the white wire to COM terminal, and the black wire to the

(–) terminal.

4.The RJ14 SCN connector on TB3 can also be used, but is only intended for temporary connection (for example, a laptop computer running Service Tool).

IMPORTANT: A shorted SCN bus cable will prevent some routines from running and may prevent the unit from start- ing. If abnormal conditions occur, unplug the connector. If conditions return to normal, check the SCN connector and cable. Run new cable if necessary. A short in one section of the bus can cause problems with all system elements on the bus.

Table 2 — Thermistor Designations

THERMISTOR

PIN

 

CONNECTION

THERMISTOR INPUT

NO.

 

 

POINT

 

 

 

 

T1

 

J8-13,14 (MBB)

Cooler Leaving Fluid

T2

 

J8-11,12 (MBB)

Cooler Entering Fluid

T7

 

J8-1,2 (MBB)

Circuit A Return Gas

 

 

Temperature (Accessory)

 

 

 

T8

 

J8-3,4 (MBB)

Circuit B (032-055 only) Return

 

 

Gas Temperature (Accessory)

 

 

 

T9

 

J8-7,8 (MBB)

Outdoor-Air Temperature

 

 

Sensor

 

 

 

T10

 

J8-5,6 (MBB)

Accessory Remote Space

 

TB5-5,6

Temperature Sensor or

 

 

 

Dual LWT Sensor

 

LEGEND

 

LWT — Leaving Water Temperature

 

MBB — Main Base Board

 

Table 3 — Status Switches

STATUS

PIN CONNECTION

SWITCH

POINT

Chilled Water Pump 1

J7-1,2

Chilled Water Pump 2

J7-3,4

Remote On/Off

TB5-9,10

Cooler Flow Switch

J7-9,10

Compressor Fault Signal, A1

J9-11,12

Compressor Fault Signal, A2

J9-5,6

Compressor Fault Signal, B1

J9-8,9

Compressor Fault Signal, B2

J9-2,3

Table 4 — Output Relays

RELAY

DESCRIPTION

NO.

 

K1

Energize Compressor A1 (010-030)

Energize Compressor A1 and Condenser Fan A1 (032-055)

 

K2

Energize Compressor B1 and Condenser Fan B1 at Low

Speed (032-040)

 

Energize Compressor B1 and Condenser Fan B1 (042-055)

K3

Energize Chilled Water Pump 1 Output

K4

Energize Chilled Water Pump 2 Output

K5

Energize Compressor A2 (all but 010, 015 60Hz)

K6

Energize Compressor B2 (042-055 only)

K7

Alarm Relay

K8

Cooler/Pump Heater

K9

Energize Condenser Fan at Low Speed (010-018)

Energize Condenser Fan A1 (022-030)

 

Energize Condenser Fan A2 (032-055)

 

Energize Condenser Fan at High Speed (010-018)

K10

Energize Condenser Fan A2 (022-030)

Energize Condenser Fan B1 at High Speed (032-040)

 

 

Energize Condenser Fan B2 (042-055)

K11

Minimum Load Valve

Table 5 — SCN Communication Bus Wiring

MANUFACTURER

PART NO.

Regular Wiring

Plenum Wiring

 

Alpha

1895

—

American

A21451

A48301

Belden

8205

884421

Columbia

D6451

—

Manhattan

M13402

M64430

Quabik

6130

—

OPERATING DATA

Sensors — The electronic control uses 3 to 6 thermistors to sense temperatures for controlling chiller operation. See Table 2. These sensors are outlined below. Thermistors T1, T2, T9 and accessory suction gas temperatures (T7,T8) are 5 kΩ at 77 F (25 C) and are identical in temperature versus resistance and voltage drop performance. Thermistor T10 is 10 kΩ at 77 F (25 C) and has a different temperature vs. resistance and voltage drop performance. See Thermistors section for temperature-resistance-voltage drop characteristics.

T1 — COOLER LEAVING FLUID SENSOR — On 30RA010- 030 sizes, this thermistor is installed in a friction fit well at the bottom of the brazed-plate heat exchanger on the control box side. For 30RA032-055 sizes, this thermistor is installed in a well in the factory-installed leaving fluid piping coming from the bottom of the brazed-plate heat exchanger opposite the control box side.

T2 — COOLER ENTERING FLUID SENSOR —On 30RA010- 030 sizes, this thermistor is installed in a friction fit well at the top of the brazed-plate heat exchanger on the control box side. For 30RA032-055 sizes, this thermistor is installed in a well in the factory-installed entering fluid piping coming from the top of the brazed-plate heat exchanger opposite the control box side.

T7,T8 — COMPRESSOR RETURN GAS TEMPERA- TURE SENSOR (ACCESSORY) — A well for this sensor is factory installed in each circuit's suction line. If desired, a 5 kΩ thermistor (Sterling part number HH79NZ029) can be installed in this well and connected to the Main Base Board as shown in Table 2. Use the Scrolling Marquee display to con- figure the sensor (Configuration mode, sub-mode OPT1 — enable item RG.EN).

T9 — OUTDOOR-AIR TEMPERATURE SENSOR — This sensor is factory-installed on a bracket at the left side of compressor A1 on 30RA010-030 models. For models 30RA032-055, it is installed behind the panel below the control box center door.

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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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