Easy BACnet
  1. Home
  2. BACnet points lists
  3. York
  4. YST Steam Turbine Chiller - OptiView E-Link (YorkTalk 3)

Steam turbine driven centrifugal chiller (via E-Link gateway) · BACnet points list

York YST Steam Turbine Chiller - OptiView E-Link (YorkTalk 3) BACnet points list

Updated 6 November 2026

Short answer

The E-Link gateway reads the YST OptiView microboard over YorkTalk 3 and serves BACnet, N2, LON and Modbus objects: remote setpoint and start/stop, water temperatures and pressures, turbine and steam values and the status codes.

This page lists 73 BACnet objects for the York YST Steam Turbine Chiller - OptiView E-Link (YorkTalk 3) — 3 of them writable — with each object’s type, instance number, name, engineering units and access. It is re-typed from York’s own free documentation, linked below.

Manufacturer
York
Model
YST Steam Turbine Chiller - OptiView E-Link (YorkTalk 3)
Equipment
Steam turbine driven centrifugal chiller (via E-Link gateway)
Equipment type
Chillers
BACnet objects
73 (3 writable)
Transport
—
Firmware
Not stated
Also known as
YORK YST, YST OptiView, steam turbine chiller, E-Link, eLink, YorkTalk 3
Source document
YST OptiView E-Link points list · rev. 2010-09-24 (Rev K_03)
Download CSV 73 rows Download EDE B.I.G.-EU JSON Manufacturer PDF ↗ Compare with your scan Download Easy BACnet Mobile App Google Play

Reference only, provided as-is: verify against York’s current documentation and the live device before use. Not official York information. Terms of use.

BMS integration notes: York YST Steam Turbine Chiller - OptiView E-Link (YorkTalk 3)

Integration in brief

Put the chiller in remote/ISN control at the panel, then start and stop it with the E-Link remote run/stop object and write the remote setpoint and current limit. Read the operating, safety and warning codes, run status and water temperatures.

Minimum points to map

The short list most integrators start with — enough to run the unit from a BMS. Map more as the job needs.

ObjectNameWhyAccess
BV 1REM START STOP CMDRemote start/stop (1 = run)Write
AV 1REM LEAVING CHW TEMP SPRemote leaving chilled liquid setpointWrite
MV 5UNIT CONTROL SOURCEMust read ISN (BAS) for BMS controlRead
MV 1UNIT OPERATION CODEUnit operating status codeRead
AV 5LEAVING CHW TEMPLeaving chilled liquid temperatureRead
AV 6ENTERING CHW TEMPEntering chilled liquid temperatureRead
MV 2UNIT SAFETY FAULT CODESafety (shutdown) fault codeRead
MV 4UNIT WARNING FAULT CODEActive warning codeRead

Enable & remote start

The E-Link remote slots (AV 1-4, BV 1-4) are the BMS commands; the chiller panel must be set for remote (ISN/BAS) control for them to take effect.

Network setup

Watch out for

York YST Steam Turbine Chiller - OptiView E-Link (YorkTalk 3) BACnet objects

Type: AI, AO, AV, BI, BO, BV, MI/MO/MV (multi-state) · Access: Read read-only, Write writable, Command writable with a priority array.

73 of 73 shown
Type
AnalogBinaryMulti-state
Access
Show
York YST Steam Turbine Chiller - OptiView E-Link (YorkTalk 3) BACnet Points List
DescriptionStates
AVmin1REM LEAVING CHW TEMP SPLeaving Chilled Liquid Temperature Setpoint°FWrite
AV2TURBINE HP LIMIT SPTurbine Horsepower Limit Setpoint (% of available range)%Write
BVmin1REM START STOP CMDSTART_STOPWrite
AVmin5LEAVING CHW TEMPLeaving Chilled Liquid Temperature°FRead
AVmin6ENTERING CHW TEMPReturn Chilled Liquid Temperature°FRead
AV7EVAPORATOR PRESSUREChiller Evaporator PressurepsiRead
AV8CONDENSER PRESSUREChiller Condenser Pressure PSIGpsiRead
AV9COMPR OIL COMP DIF PRESSCompressor Oil Pressure PSIGpsiRead
AV10ENTERING COND WATER TEMPEntering Condenser Liquid Temperature°FRead
AV11LEAVING COND WATER TEMPLeaving Condenser Liquid Temperature°FRead
AV12TURBINE INLET STEAM TEMPTurbine Inlet Steam Temperature°FRead
AV13TURBINE INLET STEAM PRESTurbine Inlet Steam PressurepsiRead
AV14TURBINE SUPPLY OIL TEMPTurbine Supply Oil Temperature°FRead
AV15TURBINE SUPPLY OIL PRESSTurbine Supply Oil Pressure PSIGpsiRead
AV16TURBINE 1ST STG STM PRESTurbine First Stage Steam PressurepsiRead
AV17TURBINE SPEEDTurbine SpeedrpmRead
AV18TURBINE EXHAUST STM PRESTurbine Exhaust Steam Pressure PSIApsiRead
AV19LEAVING CHW TEMP ACT SPLeaving Chilled Liquid Temperature Setpoint - Local°FRead
AV20COMPRESSOR PRV POSITIONCompressor PRV Position%Read
AV21EVAP SATURATION TEMPChiller Evaporator Saturation Temperature°FRead
AV22COND SATURATION TEMPChiller Condenser Saturation Temperature°FRead
AV23DISCHARGE TEMPCompressor Discharge Temperature°FRead
AV24OIL SUMP TEMPERATURECompressor Sump Oil Temperature°FRead
AV25SUBCOOLER REFRIG LEVELSubcooler Refrigerant Level%Read
AV26ACCUM OPERATING HOURSAccumulated Operating HourshoursRead
AV27ACCUM SYSTEM STARTSAccumulated System StartsRead
AV28OIL SUMP PRESSURECompressor Sump Oil Transducer Pressure PSIGpsiRead
AV29OIL PUMP PRESSURECompressor Pump Oil Transducer Pressure PSIGpsiRead
BV5PANEL ROCKER SW RUNPanel Rocker Switch - RunRead
BV6PANEL ROCKER SW STOPPanel Rocker Switch - Stop / ResetRead
BV7CHW LIQ PUMP STATChilled Liquid Pump Start ContactsRead
BV8COND LIQ PUMP STATCondenser Liquid Pump Start ContactsRead
BV9CHW FLOW SWITCH STATChilled Liquid Flow Switch ContactsRead
BV10COND LIQ FLOW SW STATCondenser Liquid Flow Switch ContactsRead
BV11COND REFRIG HI PRESS COCondenser Refrigerant High Pressure CutoutRead
BV12COMP OIL HEATER CONTCompressor Oil Heater ContactorRead
BV13COMP OIL RETURN SOL VLVCompressor Oil Return Solenoid ValveRead
BV14COMP OIL COOLER W SOL VLCompressor Oil Cooler Water Solenoid ValveRead
BV15COMP VAR SPD OIL PMP RUNCompressor Variable Speed Oil Pump Run ContactsRead
BV16COMP VAR SPD OIL PMP AUXCompressor Variable Speed Oil Pump Auxiliary ContactsRead
BV17COMPR LIQ INJ SOL VLVCompressor Liquid Injection Solenoid ValveRead
BV18COMPR HS THRUST SOLCompressor High Speed Thrust SolenoidRead
BV19CLOSED LIMIT SWITVHClosed Limit SwitchRead
BV20REM MODE READY TO STARTRemote Mode Ready To Start ContactsRead
BV22TURBINE ROTATING CONTTurbine Rotating ContactsRead
BV23TURBINE TRIP SOL VLVTurbine Trip Solenoid ValveRead
BV24TURBINE TRIP VLV CLO LSTurbine Trip Valve Closed Limit SwitchRead
MVmin1UNIT OPERATION CODEUnit Operation CodeRead
MVmin2UNIT SAFETY FAULT CODEUnit Safety Shutdown CodeRead
MV3UNIT CYCLING FAULT CODEUnit Cycling Shutdown CodeRead
MVmin4UNIT WARNING FAULT CODEUnit Alarm / Warning CodeRead
MVmin5UNIT CONTROL SOURCEUnit Control SourceRead0=Local, 1 = ISN, 2= Analog, 3 = Digital, 4 = Modem
MV6TURBINE STATUS CODETurbineStatus CodeRead
MV7UNIT MODIF RUN FLT CODEUnit Modified Run Fault CodeRead
MV8UNIT INHIBIT FAULT CODEUnit Inhibit Fault CodeRead
MV9UNIT INTERNAL FAULT CODEUnit Internal Fault CodeRead
AV30THRUST BEARING PROX POSHigh Speed Thrust Bearing Proximity PositionRead
AV31THRUST BEARING PROX REFHigh Speed Thrust Bearing Proximity ReferenceRead
AV32TURBINE GOV END BRG TEMPTurbine Governor End Bearing Temperature°FRead
AV33TURBINE SHF END BRG TEMPTurbine Shaft End Bearing Temperature°FRead
AV34HOTWELL CONDENSATE LVLHotwell Condensate Level%Read
AV35EVAP REFRIG LIQ TEMPEvaporator Refrigerant Liquid Temperature°FRead
AV36COND REFRIG LIQ TEMPCondenser Refrigerant Liquid Temperature°FRead
AV37CHILL LIQ FLOW SENSORChilled Liquid Flow Sensor (GPM)gpmRead
AV38COND LIQ FLOW SENSORCondenser Liquid Flow Sensor (GPM)gpmRead
AV39STEAM FLOW SENSORSteam Flow Sensor (lb/hr)lb/hrRead
AV40HOTGAS BYPASS VLV POSHotgas Bypass Valve Position%Read
AV41GOVERNOR VLV POSGovernor Valve Position%Read
AV43SLOW ROLL TIME REMAININGSlow Roll Time RemainingminRead
BV26TURBINE AUX OIL PMP CONTTurbine Auxiliary Oil Pump ContactorRead
BV27TURBINE AUX OIL PMP CONATurbine Auxiliary Oil Pump Contactor Auxiliary ContactRead
BV28TURBINE OIL CLRW SOL VLVTurbine Oil Cooler Water Solenoid ValveRead
BV29ALARM HORNAlarm HornRead
Object ID lookup: York YST E-Link point IDs by name

Integration notes

Check it against the live device. A points list tells you what the controller can expose; the unit in front of you may differ by firmware or installed options. This list is provided as-is for reference only and may contain mistakes — confirming it before you write, map or commission anything is up to you (terms). Easy BACnet scans a network for BACnet IP devices from an Android phone, reads every object on the YST Steam Turbine Chiller - OptiView E-Link (YorkTalk 3) and exports what it actually has to Excel — free. New to BACnet? Start with what a BACnet points list is and what the object types mean.

Questions about the York YST Steam Turbine Chiller - OptiView E-Link (YorkTalk 3)

How many BACnet points does the York YST Steam Turbine Chiller - OptiView E-Link (YorkTalk 3) have?

This list has 73 BACnet objects: 40 analog values, 24 binary values, 9 multi-state values. The exact set on a given unit depends on its firmware, installed options and configuration.

Which York YST Steam Turbine Chiller - OptiView E-Link (YorkTalk 3) BACnet points are writable?

3 of the 73 objects accept a write. Points marked Command have a priority array: a write holds until it is released, so release it back to automatic when you are done.

Where is the official York YST Steam Turbine Chiller - OptiView E-Link (YorkTalk 3) BACnet documentation?

The source is YST OptiView E-Link points list, revision 2010-09-24 (Rev K_03), published free by York at https://docs.johnsoncontrols.com/chillers/api/khub/documents/gb8ypitRHG4X5jrdL35ABQ/content.

What are the minimum BACnet points to integrate the York YST Steam Turbine Chiller - OptiView E-Link (YorkTalk 3)?

Start with BV 1 REM START STOP CMD (Remote start/stop (1 = run)); AV 1 REM LEAVING CHW TEMP SP (Remote leaving chilled liquid setpoint); MV 5 UNIT CONTROL SOURCE (Must read ISN (BAS) for BMS control); MV 1 UNIT OPERATION CODE (Unit operating status code); AV 5 LEAVING CHW TEMP (Leaving chilled liquid temperature); AV 6 ENTERING CHW TEMP (Entering chilled liquid temperature); MV 2 UNIT SAFETY FAULT CODE (Safety (shutdown) fault code); MV 4 UNIT WARNING FAULT CODE (Active warning code).

How do I enable BMS control of the York YST Steam Turbine Chiller - OptiView E-Link (YorkTalk 3)?

The E-Link remote slots (AV 1-4, BV 1-4) are the BMS commands; the chiller panel must be set for remote (ISN/BAS) control for them to take effect.

How do I check these points on the real YST Steam Turbine Chiller - OptiView E-Link (YorkTalk 3)?

Scan the network with a BACnet IP browser such as Easy BACnet, open the device and compare its object list with this table. Anything missing is usually an option that isn't installed or a point that is disabled in the controller's configuration.

More York BACnet points lists

Source: YST OptiView E-Link points list · rev. 2010-09-24 (Rev K_03). Object names, instances and units are reproduced as published; descriptions are our own.