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Steam-turbine-driven centrifugal chiller (via SC-EQ card) · BACnet points list
York YST Steam Turbine Chiller (SC-EQ) BACnet points list
Updated 28 October 2026
YORK by Johnson Controls YST chillers drive a centrifugal compressor with a steam turbine. The SC-EQ communication card exposes them on BACnet MS/TP (or Modbus RTU / N2). Remote commands are run/stop, leaving chilled water setpoint and a turbine horsepower limit; the rest is read-only: chiller and turbine temperatures, pressures, speed, steam flow, bearing and hotwell values, contact states, and multistate status and fault codes.
This page lists 74 BACnet objects for the York YST Steam Turbine Chiller (SC-EQ) — 4 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 (SC-EQ)
- Equipment
- Steam-turbine-driven centrifugal chiller (via SC-EQ card)
- Equipment type
- Chillers
- BACnet objects
- 74 (4 writable)
- Transport
- BACnet MS/TP
- Firmware
- SC-EQ software 4.2.0.20
- Default device instance
- 5000 + MAC address
- Also known as
- YORK YST, YST chiller, steam turbine drive chiller, SC-EQ, SE-SCC1001-1
- Source document
- YST SC-EQ BAS Points List · rev. Rev 1.2, 2021-12-08
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 (SC-EQ)
Run and stop it with BV 1, write the leaving chilled water setpoint (AV 1) and the turbine horsepower limit (AV 2). Read MV 1 and MV 6 for chiller and turbine state, the leaving water temperature and PRV position, and MV 2/MV 3 for safety and cycling shutdowns.
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.
| Object | Name | Why | Access |
|---|---|---|---|
| BV 1 | REM RUN STOP CMD | Remote run/stop (1 = run) | Command |
| AV 1 | REM LEAVING CHW TEMP SP | Remote leaving chilled water setpoint | Command |
| AV 2 | TURBINE HP LIMIT SP | Turbine horsepower limit, % (demand limit) | Command |
| MV 1 | UNIT OPERATION CODE | Operating state (stopped, starting, running) | Read |
| MV 6 | TURBINE STATUS CODE | Turbine state (slow roll, running, cooldown) | Read |
| MV 5 | UNIT CONTROL SOURCE | Control source; ISN (BAS) for BMS control | Read |
| AV 5 | LEAVING CHW TEMP | Leaving chilled water temperature | Read |
| AV 20 | COMPRESSOR PRV POSITION | Pre-rotation vane position, % (load) | Read |
| MV 2 | UNIT SAFETY FAULT CODE | Safety shutdown code (1 = none) | Read |
| MV 3 | UNIT CYCLING FAULT CODE | Cycling shutdown code (1 = none) | Read |
Enable & remote start
BV 1 REM RUN STOP CMD (0 = Stop, 1 = Run) is the BAS run/stop, and AV 1-2 are the remote setpoints. MV 5 Unit Control Source shows Local, ISN, Analog, Digital or Modem, and BV 20 shows the remote-mode ready-to-start contacts. The points list has no write-enable point and doesn't say how the source is chosen at the chiller panel.
Network setup
- The BAS connects to the SC-EQ J12 port (RS-485: +, -, COM/REF, SHLD). The card detects BACnet MS/TP, Modbus RTU or N2 and the baud rate by itself; allow up to 120 seconds after power-up.
- The MAC address (1-127) is set on DIP switch SW1 (switch 8 unused). Cycle the card's power after changing it.
- The device instance defaults to 5000 + the MAC address (MAC 6 gives 5006). To use another number, set Device Instance Mode to Manual and enter the instance with the SC-AP / MAP tool, or write BV 65000 (mode) and AV 65000 (instance ID).
- MV 65001 Units sets whether the BAS sees IP or SI values, independent of the chiller display; set it to match the chiller.
Watch out for
- The remote (commandable) setpoints read as unreliable until the BAS writes them the first time.
- The SC-EQ only exposes the points that apply to the chiller it detects; if it replaces an E-Link, re-discover the device so old non-applicable points don't sit offline.
- A start goes through turbine slow roll and ramp-up; watch MV 6 rather than expecting the chiller to load right after BV 1.
York YST Steam Turbine Chiller (SC-EQ) 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.
Note: the source document has no read/write column, so access here is inferred from the object type (inputs read-only, values writable). Confirm on the live controller before writing.
| Description | States | |||||
|---|---|---|---|---|---|---|
| AVmin | 1 | REM LEAVING CHW TEMP SP | Remote Leaving Chilled Liquid Setpoint | °F | Command | |
| AVmin | 2 | TURBINE HP LIMIT SP | Turbine Horsepower Limit Setpoint | % | Command | |
| BVmin | 1 | REM RUN STOP CMD | Remote Run/Stop | Command | 0=Stop, 1=Run | |
| MV | 65001 | Units | Unit system reported by the SC-EQ | Write | 0=IP (English), 1=SI (Metric) | |
| AVmin | 5 | LEAVING CHW TEMP | Leaving Chilled Liquid Temperature | °F | Read | |
| AV | 6 | ENTERING CHW TEMP | Return Chilled Liquid Temperature | °F | Read | |
| AV | 7 | EVAPORATOR PRESSURE | Evaporator Pressure | PSIG | Read | |
| AV | 8 | CONDENSER PRESSURE | Condenser Pressure | PSIG | Read | |
| AV | 9 | COMPR OIL COMP DIF PRESS | Compressor Oil Pressure | PSIG | Read | |
| AV | 10 | ENTERING COND WATER TEMP | Entering Condenser Liquid Temperature | °F | Read | |
| AV | 11 | LEAVING COND WATER TEMP | Leaving Condenser Liquid Temperature | °F | Read | |
| AV | 12 | TURBINE INLET STEAM TEMP | Turbine Inlet Steam Temperature | °F | Read | |
| AV | 13 | TURBINE INLET STEAM PRES | Turbine Inlet Steam Pressure | PSIG | Read | |
| AV | 14 | TURBINE SUPPLY OIL TEMP | Turbine Supply Oil Temperature | °F | Read | |
| AV | 15 | TURBINE SUPPLY OIL PRESS | Turbine Supply Oil Pressure | PSIG | Read | |
| AV | 16 | TURBINE 1ST STG STM PRES | Turbine First Stage Steam Pressure | PSIG | Read | |
| AV | 17 | TURBINE SPEED | Turbine Speed | RPM | Read | |
| AV | 18 | TURBINE EXHAUST STM PRES | Turbine Exhaust Steam Pressure | PSIA | Read | |
| AV | 19 | LEAVING CHW TEMP ACT SP | Leaving Chilled Liquid Temperature Setpoint - Local | °F | Read | |
| AVmin | 20 | COMPRESSOR PRV POSITION | Compressor PRV Position | % | Read | |
| AV | 21 | EVAP SATURATION TEMP | Chiller Evaporator Saturation Temperature | °F | Read | |
| AV | 22 | COND SATURATION TEMP | Chiller Condenser Saturation Temperature | °F | Read | |
| AV | 23 | DISCHARGE TEMP | Compressor Discharge Temperature | °F | Read | |
| AV | 24 | OIL SUMP TEMPERATURE | Compressor Sump Oil Temperature | °F | Read | |
| AV | 25 | SUBCOOLER REFRIG LEVEL | Subcooler Refrigerant Level | % | Read | |
| AV | 26 | ACCUM OPERATING HOURS | Accumulated Operating Hours | Hr | Read | |
| AV | 27 | ACCUM SYSTEM STARTS | Accumulated System Starts | Read | ||
| AV | 28 | OIL SUMP PRESSURE | Compressor Sump Oil Transducer Pressure | PSIG | Read | |
| AV | 29 | OIL PUMP PRESSURE | Compressor Pump Oil Transducer Pressure | PSIG | Read | |
| BV | 5 | PANEL ROCKER SW RUN | Panel Rocker Switch - Run | Read | 0=Off, 1=On | |
| BV | 6 | PANEL ROCKER SW STOP | Panel Rocker Switch - Stop / Reset | Read | 0=Off, 1=On | |
| BV | 7 | CHW LIQ PUMP STAT | Chilled Liquid Pump Start Contacts | Read | 0=Off, 1=On | |
| BV | 8 | COND LIQ PUMP STAT | Condenser Liquid Pump Start Contacts | Read | 0=Off, 1=On | |
| BV | 9 | CHW FLOW SWITCH STAT | Chilled Liquid Flow Switch Contacts | Read | 0=Off, 1=On | |
| BV | 10 | COND LIQ FLOW SW STAT | Condenser Liquid Flow Switch Contacts | Read | 0=Off, 1=On | |
| BV | 11 | COND REFRIG HI PRESS CO | Condenser Refrigerant High Pressure Cutout | Read | 0=Off, 1=On | |
| BV | 12 | COMP OIL HEATER CONT | Compressor Oil Heater Contactor | Read | 0=Off, 1=On | |
| BV | 13 | COMP OIL RETURN SOL VLV | Compressor Oil Return Solenoid Valve | Read | 0=Open, 1=Closed | |
| BV | 14 | COMP OIL COOLER W SOL VL | Compressor Oil Cooler Water Solenoid Valve | Read | 0=Open, 1=Closed | |
| BV | 15 | COMP VAR SPD OIL PMP RUN | Compressor Variable Speed Oil Pump Run Contacts | Read | 0=Off, 1=On | |
| BV | 16 | COMP VAR SPD OIL PMP AUX | Compressor variable-speed oil pump auxiliary contacts | Read | 0=Off, 1=On | |
| BV | 17 | COMPR LIQ INJ SOL VLV | Compressor Liquid Injection Solenoid Valve | Read | 0=Open, 1=Closed | |
| BV | 18 | COMPR HS THRUST SOL | Compressor High Speed Thrust Solenoid | Read | 0=Open, 1=Closed | |
| BV | 19 | CLOSED LIMIT SWITCH | Closed Limit Switch | Read | 0=Off, 1=On | |
| BV | 20 | REM MODE READY TO START | Remote Mode Ready To Start Contacts | Read | 0=Off, 1=On | |
| BV | 22 | TURBINE ROTATING CONT | Turbine Rotating Contacts | Read | 0=Off, 1=On | |
| BV | 23 | TURBINE TRIP SOL VLV | Turbine Trip Solenoid Valve | Read | 0=Open, 1=Closed | |
| BV | 24 | TURBINE TRIP VLV CLO LS | Turbine Trip Valve Closed Limit Switch | Read | 0=Off, 1=On | |
| MVmin | 1 | UNIT OPERATION CODE | Unit Operation Code | Read | 1=Unit Stopped - Ready To Start, 2=Unit Stopped - Local Shutdown, 3=Unit Stopped -Remote Shutdown, 4=Unit Stopped Warning Active, 5=Unit Stopped - Cycling Shutdown, 6=Unit Stopped - Safety Shutdown, 7=Unit Start Inhibit, 8=Unit Starting, 9=Unit Running - No Abnormal Condition, 10=Unit Running - Warning Active, 11=Unit Running - Chiller Unload Before Shutdown, 12=Unit Coastdown / Lockout Delay, 13=Unit Stopped - Turbine Cooldown, 14=Unit Stopped - Internal Shutdown | |
| MVmin | 2 | UNIT SAFETY FAULT CODE | Unit Safety Shutdown Code | Read | 1=No Malfunction, 2=Evaporator - Low Pressure, 3=Evaporator - Transducer Or Leaving Liquid Probe, 4=Evaporator - Transducer Or Temperature Sensor, 5=Evaporator - Low Temperature, 6=Evaporator - Low Pressure - Smart Freeze, 7=Condenser - High Pressure Contacts Open, 8=Condenser - High Pressure, 9=Condenser - Pressure Transducer Out Of Range, 10=Auxiliary Safety - Contacts Closed, 11=Control Panel - Power Failure (Manual Restart), 12=Discharge - Low Temperature, 13=Discharge - High Temperature, 14=Compressor Oil - High Temperature, 15=Compressor Oil - Low Differential Pressure, 16=Compressor Oil - High Differential Pressure, 17=Compressor Oil - Pump Press Xdcr Out Of Range, 18=Compressor Oil - Sump Press Xdcr Out Of Range, 19=Compressor Oil - High Pressure, 20=Compressor Oil - Differential Pressure Calibration, 22=Oil - Variable Speed Pump - Setpoint Not Achieved, 23=Thrust Bearing - Proximity Probe Clearance - Fwd, 24=Thrust Bearing - Proximity Probe Clearance - Rev, 25=Thrust Bearing - Proximity Probe Uncalibrated, 26=Thrust Bearing - Proximity Probe Out Of Range, 27=Thrust Bearing - Limit Switch, 29=Turbine - Low Oil Pressure, 31=Turbine - High Oil Temperature, 33=Turbine - Governor End Bearing High Temperature, 34=Turbine - Shaft End Bearing High Temperature, 35=Turbine - Governor End Vibration, 36=Turbine - Shaft End Vibration, 37=Turbine - High Inlet Steam Pressure, 38=Turbine - High Exhaust Steam Pressure, 39=Turbine - Hotwell Low Level, 40=Turbine - Hotwell High Level - Analog, 41=Turbine - Hotwell Pump Failure, 42=Turbine - Vacuum Seal Failure, 43=Turbine - Vacuum Pump Failure, 44=Turbine - High Vacuum Pressure, 45=Turbine - Underspeed While Starting, 46=Turbine - Underspeed While Running, 47=Turbine - Steam Supply Valve Malfunction, 48=Turbine - Overspeed, 49=Turbine - Mechanical Overspeed Test Failure, 50=Turbine - Underspeed Dip While Starting, 51=Turbine - Underspeed Dip While Running, 52=Turbine - Excessive Slow Roll, 53=Turbine - Mechanical Trip, 54=Turbine - Excessive Start Delay, 55=Turbine - Shaft Bearing Temperature Out Of Range, 56=Turbine - Oil Temperature Out Of Range, 57=Turbine - Oil Pressure Out Of Range, 58=Turbine - Hotwell High Level - Digital, 59=MPU Failure, 60=Slow Roll Overspeed, 61=Turbine - Governor End Horizontal Vibration, 62=Turbine - Governor End Vertical Vibration, 63=Turbine - Shaft End Horizontal Vibration, 64=Turbine - Governor End Vertical Vibration, 65=Turbine - Govr End Horiz Vibration Out of Range, 66=Turbine - Gov End Vert Vibration Out of Range, 67=Turbine - Shaft End Horiz Vibration Out of Range, 68=Turbine - Gov End Vert Vibration Out of Range, 69=Compressor - Horiz Vibration Out of Range, 70=Compressor - Vertical Vibration Out of Range, 71=Safety Shutdown- Steam Supply Out of Range | |
| MVmin | 3 | UNIT CYCLING FAULT CODE | Unit Cycling Shutdown Code | Read | 1=No Malfunction, 3=Remote Cycling, 4=Low Compressr Oil Differential Temperature, 5=Low Compressr Sump Oil Temperature, 6=Control Panel - Power Fail (Autostart), 7=Evaporator - Low Chilled Liquid Temperature, 8=Evaporator - Flow Switch Open, 9=Chiller Condenser - Flow Switch Open, 10=Control Panel - Schedule Shutdown, 11=Proximity Probe - Low Supply Voltage, 12=Oil - Variable Speed Pump - Drive Contacts Open, 13=Expansion I/O Serial Communications | |
| MV | 4 | UNIT WARNING FAULT CODE | Unit Alarm / Warning Code | Read | 1=No Malfunction, 2=Real-Time Clock Failure, 3=Setpoint Override, 5=Condenser Or Evaporator Transducer Error, 6=Evaporator - Low Pressure Limit, 7=Consenser - High Pressure Limit, 8=Condenser Transducer Error, 9=Freeze Threat From Operating Chiller, 10=Refrigerant Level Out Of Range, 11=Seal Lubrication In Process, 12=Standby Lube - Low Oil Pressure, 14=Turbine - High Condensate Level, 15=Turbine - Oil Low Pressure, 16=Turbine - Auxiliary Oil Low Pressure, 17=Turbine - Oil High Temperature, 19=Turbine - Auxiliary Oil Pump Overrun, 20=Turbine - Speed Sensor Differential, 21=Turbine - Governor End Bearing High Temperature, 22=Turbine - Shaft End Bearing High Temperature, 23=Turbine - Governor End Vibration, 24=Turbine - Shaft End Vibration, 25=Turbine - Inlet Steam High Pressure, 26=Turbine - Exhaust Steam High Pressure, 27=Turbine - Hotwell Low Level, 28=Turbine - Hotwell High Level, 29=Turbine - Hotwell Lead Pump, 30=Turbine - Vacuum Lead Seal, 31=Turbine - Vacuum Lead Pump, 32=Turbine - Vacuum High Pressure, 33=Turbine - High Condensate Drain Level, 34=Mechanical Overspeed Test in Progress, 35=Vacuum Pump Overrrun, 36=Turbine - Governor End Horizontal Vibration, 37=Turbine - Governor End Vertical Vibration, 38=Turbine - Shaft End Horizontal Vibration, 39=Turbine - Governor End Vertical Vibration, 40=Evaporator Low pressure Override, 41=Condenser High pressure Override, 42=Turbine Power Limiter Override, 43=Auto Capacity Control Unavailable, 44=Condenser or VGD sensor Failure, 45=Conditions Override VGD | |
| MVmin | 5 | UNIT CONTROL SOURCE | Unit Control Source | Read | 0=Local, 1=ISN, 2=Analog, 3=Digital, 4=Modem | |
| MVmin | 6 | TURBINE STATUS CODE | Turbine Status Code | Read | 1=Stopped, 2=System Starting, 3=Ready to Begin Slow Roll (Manual), 4=Waiting for Steam Flow (Manual) / System Starting (Auto) / Slow Rolling, 5=Turbine Idling - High Exhaust Pressure, 6=Ready to Run (Manual), 7=Ready to Run (Auto) / Ramping to Rated Speed, 8=Stabilizing, 9=Running, 10=Unloading Before Shutdown, 11=Compressor Shutdown; Turbine Cooldown | |
| MV | 7 | UNIT MODIF RUN FLT CODE | Unit Modified Run Fault Code | Read | 1=No Modified Run Conditions Present, 2=Leaving Chilled Liquid Control, 3=Vanes Closing Before Shutdown, 4=Slide Valve Unloading before Shutdown, 5=Seal Lube in Process | |
| MV | 8 | UNIT INHIBIT FAULT CODE | Unit Inhibit Fault Code | Read | 1=No Start Inhibits Present, 2=Vane Motor Switch Open, 3=Turbine Vibration Sensor Fault, 4=Vanes Uncalibrated, 5=Compressor Vibration Sensor Fault | |
| MV | 9 | UNIT INTERNAL FAULT CODE | Unit Internal Fault Code | Read | 1=No Internal Faults Present, 2=Internal Error- No timer Handles Available, 3=Watchdog- Software Reboot, 4=Internal Error- Cannot create Task | |
| AV | 30 | THRUST BEARING PROX POS | High Speed Thrust Bearing Proximity Position | Read | ||
| AV | 31 | THRUST BEARING PROX REF | High Speed Thrust Bearing Proximity Reference | Read | ||
| AV | 32 | TURBINE GOV END BRG TEMP | Turbine Governor End Bearing Temperature | °F | Read | |
| AV | 33 | TURBINE SHF END BRG TEMP | Turbine Shaft End Bearing Temperature | °F | Read | |
| AV | 34 | HOTWELL CONDENSATE LVL | Hotwell Condensate Level | % | Read | |
| AV | 35 | EVAP REFRIG LIQ TEMP | Evaporator Refrigerant Liquid Temperature | °F | Read | |
| AV | 36 | COND REFRIG LIQ TEMP | Condenser Refrigerant Liquid Temperature | °F | Read | |
| AV | 37 | CHILL LIQ FLOW SENSOR | Chilled Liquid Flow Sensor | GPM | Read | |
| AV | 38 | COND LIQ FLOW SENSOR | Condenser Liquid Flow Sensor | GPM | Read | |
| AV | 39 | STEAM FLOW SENSOR | Steam Flow Sensor | Lb/Hr | Read | |
| AV | 40 | HOTGAS BYPASS VLV POS | Hotgas Bypass Valve Position | % | Read | |
| AV | 41 | GOVERNOR VLV POS | Governor Valve Position | % | Read | |
| AV | 43 | SLOW ROLL TIME REMAINING | Slow Roll Time Remaining | Min | Read | |
| BV | 26 | TURBINE AUX OIL PMP CONT | Turbine Auxiliary Oil Pump Contactor | Read | 0=Off, 1=On | |
| BV | 27 | TURBINE AUX OIL PMP CONA | Turbine auxiliary oil pump contactor auxiliary contact | Read | 0=Open, 1=Closed | |
| BV | 28 | TURBINE OIL CLRW SOL VLV | Turbine Oil Cooler Water Solenoid Valve | Read | 0=Off, 1=On | |
| BV | 29 | ALARM HORN | Alarm Horn | Read | 0=Off, 1=On |
No points match these filters.
Object ID lookup: York YST Steam Turbine Chiller point IDs by name
AV1REM LEAVING CHW TEMP SPAV2TURBINE HP LIMIT SPBV1REM RUN STOP CMDMV65001UnitsAV5LEAVING CHW TEMPAV6ENTERING CHW TEMPAV7EVAPORATOR PRESSUREAV8CONDENSER PRESSUREAV9COMPR OIL COMP DIF PRESSAV10ENTERING COND WATER TEMPAV11LEAVING COND WATER TEMPAV12TURBINE INLET STEAM TEMPAV13TURBINE INLET STEAM PRESAV14TURBINE SUPPLY OIL TEMPAV15TURBINE SUPPLY OIL PRESSAV16TURBINE 1ST STG STM PRESAV17TURBINE SPEEDAV18TURBINE EXHAUST STM PRESAV19LEAVING CHW TEMP ACT SPAV20COMPRESSOR PRV POSITIONAV21EVAP SATURATION TEMPAV22COND SATURATION TEMPAV23DISCHARGE TEMPAV24OIL SUMP TEMPERATUREAV25SUBCOOLER REFRIG LEVELAV26ACCUM OPERATING HOURSAV27ACCUM SYSTEM STARTSAV28OIL SUMP PRESSUREAV29OIL PUMP PRESSUREBV5PANEL ROCKER SW RUNBV6PANEL ROCKER SW STOPBV7CHW LIQ PUMP STATBV8COND LIQ PUMP STATBV9CHW FLOW SWITCH STATBV10COND LIQ FLOW SW STATBV11COND REFRIG HI PRESS COBV12COMP OIL HEATER CONTBV13COMP OIL RETURN SOL VLVBV14COMP OIL COOLER W SOL VLBV15COMP VAR SPD OIL PMP RUNBV16COMP VAR SPD OIL PMP AUXBV17COMPR LIQ INJ SOL VLVBV18COMPR HS THRUST SOLBV19CLOSED LIMIT SWITCHBV20REM MODE READY TO STARTBV22TURBINE ROTATING CONTBV23TURBINE TRIP SOL VLVBV24TURBINE TRIP VLV CLO LSMV1UNIT OPERATION CODEMV2UNIT SAFETY FAULT CODEMV3UNIT CYCLING FAULT CODEMV4UNIT WARNING FAULT CODEMV5UNIT CONTROL SOURCEMV6TURBINE STATUS CODEMV7UNIT MODIF RUN FLT CODEMV8UNIT INHIBIT FAULT CODEMV9UNIT INTERNAL FAULT CODEAV30THRUST BEARING PROX POSAV31THRUST BEARING PROX REFAV32TURBINE GOV END BRG TEMPAV33TURBINE SHF END BRG TEMPAV34HOTWELL CONDENSATE LVLAV35EVAP REFRIG LIQ TEMPAV36COND REFRIG LIQ TEMPAV37CHILL LIQ FLOW SENSORAV38COND LIQ FLOW SENSORAV39STEAM FLOW SENSORAV40HOTGAS BYPASS VLV POSAV41GOVERNOR VLV POSAV43SLOW ROLL TIME REMAININGBV26TURBINE AUX OIL PMP CONTBV27TURBINE AUX OIL PMP CONABV28TURBINE OIL CLRW SOL VLVBV29ALARM HORN
Integration notes
- Access is inferred: the sheet has no read/write column. The remote block (AV 1-2, BV 1) is treated as commandable and MV 65001 as writable; everything else as read-only.
- Status-code MVs (operation, fault, warning, modified run, start inhibit, internal fault) are the printed code + 1, as the doc's status code tables say. MVs with their own enum in the points table (Units, control sources) are shown as printed, from 0; BACnet multistate values start at 1, so the card may report the printed number + 1. Confirm by discovery.
- Units shown are the IP units; with MV 65001 set to SI the card reports °C, kPa and so on.
- Spare objects in the sheet (AV 3-4, AV 42, BV 2-4, BV 21, BV 25, MV 10) have no name and are left out.
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 (SC-EQ) 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 (SC-EQ)
How many BACnet points does the York YST Steam Turbine Chiller (SC-EQ) have?
This list has 74 BACnet objects: 40 analog values, 24 binary values, 10 multi-state values. The exact set on a given unit depends on its firmware, installed options and configuration.
Which York YST Steam Turbine Chiller (SC-EQ) BACnet points are writable?
4 of the 74 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. The source has no read/write column, so this is inferred from object type.
Where is the official York YST Steam Turbine Chiller (SC-EQ) BACnet documentation?
The source is YST SC-EQ BAS Points List, revision Rev 1.2, 2021-12-08, published free by York at https://docs.johnsoncontrols.com/chillers/api/khub/documents/xdkEW8x~Tlf_XJgFpLpcbA/content.
What are the minimum BACnet points to integrate the York YST Steam Turbine Chiller (SC-EQ)?
Start with BV 1 REM RUN STOP CMD (Remote run/stop (1 = run)); AV 1 REM LEAVING CHW TEMP SP (Remote leaving chilled water setpoint); AV 2 TURBINE HP LIMIT SP (Turbine horsepower limit, % (demand limit)); MV 1 UNIT OPERATION CODE (Operating state (stopped, starting, running)); MV 6 TURBINE STATUS CODE (Turbine state (slow roll, running, cooldown)); MV 5 UNIT CONTROL SOURCE (Control source; ISN (BAS) for BMS control); AV 5 LEAVING CHW TEMP (Leaving chilled water temperature); AV 20 COMPRESSOR PRV POSITION (Pre-rotation vane position, % (load)); MV 2 UNIT SAFETY FAULT CODE (Safety shutdown code (1 = none)); MV 3 UNIT CYCLING FAULT CODE (Cycling shutdown code (1 = none)).
How do I enable BMS control of the York YST Steam Turbine Chiller (SC-EQ)?
BV 1 REM RUN STOP CMD (0 = Stop, 1 = Run) is the BAS run/stop, and AV 1-2 are the remote setpoints. MV 5 Unit Control Source shows Local, ISN, Analog, Digital or Modem, and BV 20 shows the remote-mode ready-to-start contacts. The points list has no write-enable point and doesn't say how the source is chosen at the chiller panel.
How do I check these points on the real YST Steam Turbine Chiller (SC-EQ)?
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
- Centrifugal chiller retrofit control panel (via SC-EQ card)
York Competitive Retrofit Chiller Panel (SC-EQ)
Other makers' centrifugal chillers retrofitted with a YORK by Johnson Controls OptiView-style control panel and the SC-EQ communication card.
Also known as: YORK competitive retrofit, OptiView retrofit panel, CR SC-EQ, SC-EQ, SE-SCC1001-1 - Packaged rooftop unit controller (ECO2, 50-130 ton)
York ECO2 Rooftop Unit, 50-130 ton, Mod D/E (IPU 1, native BACnet MS/TP)
YORK ECO2 Mod D and Mod E packaged rooftop units, 50 to 130 tons, with the IPU 1 microboard.
Also known as: YORK ECO2, ECO 2, IPU 1, IPU1, YORK Series 100, Series 100 rooftop, ECO2 Native - Dedicated outdoor air system (DOAS) controller
York JDHA DOAS, Option D19 Space Temperature Control (BACnet MS/TP card)
YORK JDHA dedicated outdoor air units with the Option D19 space temperature control program and the BHB8 BACnet card.
Also known as: JDHA, YORK JDHA, Option D19, D19, 100.55-O1, LD18545, DOAS - Make-up air unit / DOAS controller
York JDMA DOAS, Option D21 Makeup Air Control (BACnet MS/TP card)
YORK JDMA dedicated outdoor air units with the Option D21 makeup air control program and the BHB8 BACnet card.
Also known as: JDMA, YORK JDMA, Option D21, D21, 100.55-O2, LD18456, DOAS, makeup air - Water-cooled self-contained unit controller (IPU2)
York L-Series LSWU / LSWD / LSWF Water-Cooled Self-Contained Unit, 25-105 ton (IPU2, native BACnet MS/TP)
YORK L-Series LSWU, LSWD and LSWF water-cooled self-contained air conditioning units, 25-105 ton, with the IPU2 unit controller.
Also known as: LSWU, LSWD, LSWF, L-Series, IPU2, 145.05-NOM7, YSWU, YSWD, Versecon - Rooftop unit controller
York Millennium / Series 40 Packaged Rooftop Units 25-40 Ton with IPU Control
YORK Millennium (Series 40) 25, 30 and 40 ton packaged rooftop units with the IPU control, constant volume, VAV and FlexSys versions.
Also known as: YORK Millennium, Millennium 25-40 ton, Series 40 Rooftop, YORK Series 40, IPU control, 100.50-NOM8, LD14136 - Rooftop unit (packaged, via BACnet IP gateway kit)
York Roomtop RTC/RTH-L with YKN2Open BMS kit (BACnet IP)
York (Johnson Controls Europe) Roomtop RTC/RTH-L cooling and heat pump rooftops, ACTIVA and Large ACTIVA rooftops and VITALITY VAC/VAH/VCH-VIR units with the YKN2Open control and the S606791244 BACnet IP kit.
Also known as: Roomtop RTC-L, Roomtop RTH-L, YKN2Open, S606791244, FS-QS-1010-0122, ACTIVA Rooftop, Large ACTIVA Rooftop, VITALITY VAC, VITALITY VAH, VCH-VIR, N-40462 - Scroll chiller / heat pump / condensing unit
York Scroll Chiller / Heat Pump / Condensing Unit (native BACnet MS/TP)
YORK by Johnson Controls scroll-compressor chillers, heat pumps and condensing units (including YCWL and YLAE) with the 031-02550 board and its native BAS port.
Also known as: YORK scroll chiller, YORK scroll heat pump, YCWL, YLAE, 031-02550, C.MMC.13, C.MMC.14, C.MMC.16 - Scroll chiller / heat pump / condensing unit (via SC-EQ card)
York Scroll Chiller / Heat Pump / Condensing Unit (SC-EQ)
YORK by Johnson Controls scroll-compressor chillers, heat pumps and condensing units (one or two refrigerant systems, including the YCWL) fitted with the SC-EQ communication card.
Also known as: YORK scroll chiller, YORK scroll heat pump, YORK condensing unit, YCWL, SC-EQ, SE-SCC1001-1 - Scroll chiller / heat pump (via E-Link gateway)
York Scroll Chiller / Heat Pump / Condensing Unit - BAS (ISN) E-Link (YorkTalk 2)
YORK scroll chillers, heat pumps and condensing units (board 031-02550, including YCWL and YLAE variants named on the sheet), connected through a YORK E-Link gateway over YorkTalk 2.
Also known as: YORK scroll chiller, YCWL, YLAE, Scroll BAS, E-Link, eLink, YorkTalk 2, 031-02550 - Packaged rooftop unit controller (Series 100, 50-65 ton)
York Series 100 YPAL Rooftop, 50-65 ton, Mod F (IPU, native BACnet MS/TP)
YORK Series 100 YPAL single packaged rooftop units, 50-65 ton Mod F, with the IPU control board.
Also known as: YPAL, YORK Series 100, Series 100 rooftop, YPAL 50-65 Mod F, 100.50-NOM5, IPU - Packaged rooftop unit controller (Series 100, 70-150 ton)
York Series 100 YPAL Rooftop, 70-150 ton, Mod F/G (IPU, native BACnet MS/TP)
YORK Series 100 YPAL single packaged rooftop units, 70-105 ton Mod F and 120-150 ton Mod G, with the IPU control board.
Also known as: YPAL, YORK Series 100, Series 100 rooftop, YPAL 120-150 Mod G, YPAL 70-105 Mod F, 100.50-NOM11, 100.50-NOM9, IPU - Air-cooled variable-speed screw chiller
York YCAV / YCIV Air-Cooled Screw Chiller (native BACnet MS/TP)
YORK YCAV and YCIV air-cooled variable-speed screw chillers (up to four refrigerant systems) with the 031-03478 microboard and its native BAS port.
Also known as: YORK YCAV, YORK YCIV, 031-03478, YCAV_IV Native, Latitude - Air-cooled variable-speed screw chiller (via E-Link gateway)
York YCAV / YCIV Air-Cooled Screw Chiller - BAS E-Link (YorkTalk 2)
YORK YCAV and YCIV air-cooled screw chillers (1/2 and 3/4 compressor sections, microboard 031-02478), connected through a YORK E-Link gateway over YorkTalk 2.
Also known as: YORK YCAV, YORK YCIV, YCAV_YCIV BAS, E-Link, eLink, YorkTalk 2, 031-02478 - Water-cooled dual-compressor centrifugal chiller (via SC-EQ card)
York YD Dual-Compressor Centrifugal Chiller (SC-EQ)
YORK by Johnson Controls YD water-cooled centrifugal chillers with two compressors, fitted with the SC-EQ communication card.
Also known as: YD, YORK YD, SC-EQ, SC-EQUIP, SE-SCC1001-1, OptiView - Water-cooled centrifugal chiller (via E-Link gateway)
York YD Dual-Compressor Centrifugal Chiller - OptiView E-Link (YorkTalk 3)
YORK YD dual-compressor centrifugal chillers with OptiView panel, connected through a YORK E-Link gateway over YorkTalk 3.
Also known as: YORK YD, YD OptiView, E-Link, eLink, YorkTalk 3 - Absorption chiller, steam or hot water (via SC-EQ card)
York YIA Absorption Chiller (SC-EQ)
YORK YIA steam- or hot-water-fired absorption chillers fitted with the SC-EQ communication card.
Also known as: YORK YIA, YIA absorption, SC-EQ, SE-SCC1001-1 - Water-cooled centrifugal chiller (via SC-EQ card)
York YK Centrifugal Chiller (SC-EQ)
YORK by Johnson Controls YK water-cooled centrifugal chillers (OptiView panel) fitted with the SC-EQ communication card.
Also known as: YK, YORK YK, SC-EQ, SC-EQUIP, SE-SCC1001-1, OptiView - Water-cooled centrifugal chiller (via E-Link gateway)
York YK Centrifugal Chiller with Electro-Mechanical or Solid State Starter - OptiView E-Link (YorkTalk 3)
YORK YK centrifugal chillers with OptiView panel and an electro-mechanical or solid-state starter, connected through a YORK E-Link gateway over YorkTalk 3.
Also known as: YORK YK, YK OptiView, YK SSS, YK EM starter, E-Link, eLink, YorkTalk 3 - Water-cooled centrifugal chiller (via E-Link gateway)
York YK Centrifugal Chiller with VSD - OptiView E-Link (YorkTalk 3)
YORK YK centrifugal chillers with OptiView panel and variable speed drive, connected through a YORK E-Link gateway over YorkTalk 3.
Also known as: YORK YK, YK OptiView, YK VSD, E-Link, eLink, YorkTalk 3, 031-01730, 031-02430 - Water-cooled centrifugal chiller with economizer compressor (via SC-EQ card)
York YK-EP Centrifugal Chiller (SC-EQ)
YORK by Johnson Controls YK-EP (Efficiency Plus) water-cooled centrifugal chillers, which pair the main compressor with an economizer compressor, fitted with the SC-EQ communication card.
Also known as: YK-EP, YKEP, YK EP, YK-EP Efficiency Plus, SC-EQ, SC-EQUIP, SE-SCC1001-1 - Water-cooled centrifugal chiller (via E-Link gateway)
York YK-EP Centrifugal Chiller with EM or SSS Starter - OptiView E-Link (YorkTalk 3)
YORK YK-EP (YKEP) centrifugal chillers with OptiView panel and electro-mechanical or solid-state starters, connected through a YORK E-Link gateway over YorkTalk 3.
Also known as: YORK YKEP, YK-EP, YKEP OptiView, E-Link, eLink, YorkTalk 3 - Water-cooled centrifugal chiller (via E-Link gateway)
York YK-EP Centrifugal Chiller with VSD - OptiView E-Link (YorkTalk 3)
YORK YK-EP (YKEP) centrifugal chillers with OptiView panel and variable speed drive, connected through a YORK E-Link gateway over YorkTalk 3.
Also known as: YORK YKEP, YK-EP, YKEP OptiView, E-Link, eLink, YorkTalk 3, 031-02430 - Water-cooled centrifugal heat pump chiller (via SC-EQ card)
York YKHT Centrifugal Heat Pump Chiller, YT3 panel (SC-EQ)
YORK YKHT two-stage centrifugal heat pump chillers with the YT3 control panel, fitted with the SC-EQ communication card.
Also known as: YORK YKHT, YKHT, YT3, YT3 YKHT, SC-EQ, YKHT heat pump chiller - Air-to-water modular heat pump (four-pipe)
York YMAE Four-Pipe Modular Heat Pump
YORK YMAE air-to-water modular heat pumps with inverter compressors in the four-pipe (simultaneous heating and cooling) version.
Also known as: YORK YMAE, YMAE-130, YMAE four pipe, air-to-water heat pump - Air-to-water modular heat pump (two-pipe)
York YMAE Two-Pipe Modular Heat Pump
YORK YMAE air-to-water modular heat pumps with inverter compressors in the two-pipe (heating or cooling) version.
Also known as: YORK YMAE, YMAE two pipe, YMAE 2-pipe, air-to-water heat pump - Water-cooled magnetic-bearing centrifugal chiller (via SC-EQ card)
York YMC2 Magnetic-Bearing Centrifugal Chiller (SC-EQ)
YORK by Johnson Controls YMC2 oil-free, magnetic-bearing centrifugal chillers with a variable speed drive, fitted with the SC-EQ communication card.
Also known as: YMC2, YORK YMC2, YMC², SC-EQ, SC-EQUIP, SE-SCC1001-1 - Water-cooled centrifugal chiller (via E-Link gateway)
York YMC2 Magnetic-Bearing Centrifugal Chiller - OptiView E-Link (YorkTalk 3)
YORK YMC2 magnetic-bearing centrifugal chillers with OptiView panel, connected through a YORK E-Link gateway over YorkTalk 3.
Also known as: YORK YMC2, YMC², YMC2 OptiView, E-Link, eLink, YorkTalk 3, 031-02430 - Water-cooled screw chiller (via SC-EQ card)
York YR Screw Chiller (OptiView, SC-EQ)
YORK YR water-cooled screw chillers with OptiView controls, fitted with the SC-EQ communication card.
Also known as: YORK YR, YR OptiView, YR chiller, SC-EQ, SE-SCC1001-1 - Water-cooled screw chiller (via E-Link gateway)
York YR Screw Chiller - OptiView E-Link (YorkTalk 3)
YORK YR water-cooled screw chillers with OptiView panel and standard or solid-state starter, connected through a YORK E-Link gateway over YorkTalk 3.
Also known as: YORK YR, YR OptiView, E-Link, eLink, YorkTalk 3, 031-01730, 031-02430 - Water-cooled screw chiller (via E-Link gateway)
York YS / YN Screw Chiller - OptiView E-Link (YorkTalk 3)
YORK YS and YN water-cooled screw chillers with OptiView panel and standard or solid-state starter, connected through a YORK E-Link gateway over YorkTalk 3.
Also known as: YORK YS, YORK YN, YS OptiView, YN OptiView, E-Link, eLink, YorkTalk 3 - Water-cooled screw chiller / heat pump (via SC-EQ card)
York YS / YS HP / YN Screw Chiller (SC-EQ)
YORK YS and YN water-cooled screw chillers and YS HP heat pumps with OptiView controls, fitted with the SC-EQ communication card.
Also known as: YORK YS, YS HP, YORK YN, YS heat pump, OptiView YS, SC-EQ, SE-SCC1001-1 - Air-cooled screw chiller
York YSAA Air-Cooled Screw Chiller (native BACnet MS/TP)
YORK YSAA air-cooled screw chillers (two refrigerant systems) with the 031-02550 board and its native BAS port.
Also known as: YORK YSAA, YSAA chiller, 031-02550, YSAA Native - Air-cooled screw chiller (via E-Link gateway)
York YSAA Air-Cooled Screw Chiller - BAS (ISN) E-Link (YorkTalk 2)
YORK YSAA air-cooled screw chillers (board 031-02550), connected through a YORK E-Link gateway over YorkTalk 2.
Also known as: YORK YSAA, YSAA BAS, E-Link, eLink, YorkTalk 2, 031-02550 - Steam turbine driven centrifugal chiller (via E-Link gateway)
York YST Steam Turbine Chiller - OptiView E-Link (YorkTalk 3)
YORK YST steam turbine driven centrifugal chillers with OptiView panel, connected through a YORK E-Link gateway over YorkTalk 3.
Also known as: YORK YST, YST OptiView, steam turbine chiller, E-Link, eLink, YorkTalk 3 - Water-cooled centrifugal chiller (via SC-EQ card)
York YT Centrifugal Chiller (SC-EQ)
YORK YT water-cooled centrifugal chillers with OptiView controls, fitted with the SC-EQ communication card (VSD, solid-state or electro-mechanical starters).
Also known as: YORK YT, YT chiller, OptiView YT, SC-EQ, SE-SCC1001-1 - Water-cooled centrifugal chiller (via E-Link gateway)
York YT Centrifugal Chiller (Standard or Solid State Starter) - OptiView E-Link (YorkTalk 3)
YORK YT centrifugal chillers with OptiView panel and a standard (electro-mechanical) or solid-state starter, connected through a YORK E-Link gateway over YorkTalk 3.
Also known as: YORK YT, YT OptiView, E-Link, eLink, YorkTalk 3, 031-01730, 031-02430 - Water-cooled centrifugal chiller (via E-Link gateway)
York YT Centrifugal Chiller with VSD - OptiView E-Link (YorkTalk 3)
YORK YT centrifugal chillers with OptiView panel and variable speed drive, connected through a YORK E-Link gateway over YorkTalk 3.
Also known as: YORK YT, YT OptiView, YT VSD, E-Link, eLink, YorkTalk 3 - Air-cooled variable-speed screw chiller
York YVAA / YVFA / YAGK Chiller (native BACnet MS/TP)
YORK YVAA, YVFA (free cooling) and YAGK air-cooled variable-speed screw chillers with the 031-03478 board and its native BAS port.
Also known as: YORK YVAA, YORK YVFA, YORK YAGK, YVAA native, 031-03478, Y.ACS.20 - Air-cooled variable-speed screw chiller (via SC-EQ card)
York YVAA / YVFA / YAGK Chiller (SC-EQ)
YORK YVAA, YVFA (free cooling) and YAGK air-cooled variable-speed screw chillers (two refrigerant systems) fitted with the SC-EQ communication card.
Also known as: YORK YVAA, YORK YVFA, YORK YAGK, YVAA, YVFA, YAGK, SC-EQ, SE-SCC1001-1 - Air-cooled variable-speed screw chiller (via SC-EQ card)
York YVAA / YVFA / YAGK Chiller, YT3 panel (SC-EQ)
YORK YVAA, YVFA (free cooling) and YAGK air-cooled variable-speed screw chillers (two refrigerant systems) fitted with the SC-EQ communication card and the YT3 control panel.
Also known as: YORK YVAA, YORK YVFA, YORK YAGK, YVAA, YVFA, YAGK, SC-EQ, SE-SCC1001-1, YT3, YVAA YT3 - Air-cooled variable-speed screw chiller (via E-Link gateway)
York YVAA / YVFA / YAGK E-Link (YorkTalk 2)
YORK YVAA, YVFA (free cooling) and YAGK air-cooled variable-speed screw chillers with 031-02478 or 031-03478 microboards, connected through a YORK E-Link gateway over YorkTalk 2.
Also known as: YORK YVAA, YORK YVFA, YAGK, E-Link, eLink, YorkTalk 2, 031-02478, 031-03478 - Air-cooled variable-speed screw chiller (via SC-EQ card)
York YVAA Style B Chiller (SC-EQ)
YORK YVAA Style B air-cooled variable-speed screw chillers (two refrigerant systems) fitted with the SC-EQ communication card.
Also known as: YORK YVAA, YVAA Style B, YVAA-B, SC-EQ, SE-SCC1001-1 - Air-cooled magnetic-bearing centrifugal chiller (via SC-EQ card)
York YVAM Air-Cooled Magnetic-Bearing Centrifugal Chiller (SC-EQ)
YORK YVAM air-cooled magnetic-bearing centrifugal chillers fitted with the SC-EQ communication card.
Also known as: YORK YVAM, YVAM chiller, YVAM mag bearing, SC-EQ, SE-SCC1001-1 - Water-cooled variable-speed screw chiller / heat pump (via SC-EQ card)
York YVWA Water-Cooled Variable-Speed Screw Chiller (SC-EQ)
YORK YVWA water-cooled variable-speed screw chillers (one or two compressors, chiller or heat pump mode) fitted with the SC-EQ communication card.
Also known as: YORK YVWA, YVWA chiller, YVWA heat pump, SC-EQ, SE-SCC1001-1 - Water-cooled variable-speed screw chiller (via E-Link gateway)
York YVWA Water-Cooled Variable-Speed Screw Chiller - BAS E-Link (YorkTalk 2)
YORK YVWA water-cooled variable-speed screw chillers (microboards 031-02478 / 031-03478), connected through a YORK E-Link gateway over YorkTalk 2.
Also known as: YORK YVWA, YVWA BAS, E-Link, eLink, YorkTalk 2, 031-02478, 031-03478 - Water-cooled screw chiller / water-to-water heat pump (via SC-EQ card)
York YVWH / YVWE / YGWH Water-Cooled Screw (SC-EQ)
YORK YVWH and YGWH water-to-water screw heat pumps and YVWE water-cooled screw chillers fitted with the SC-EQ communication card.
Also known as: YORK YVWH, YVWH-200, YORK YVWE, YORK YGWH, SC-EQ, water-to-water screw heat pump - Water-cooled magnetic-bearing centrifugal chiller (via SC-EQ card)
York YZ Magnetic-Bearing Centrifugal Chiller (SC-EQ)
YORK YZ water-cooled magnetic-bearing centrifugal chillers (variable speed drive) fitted with the SC-EQ communication card.
Also known as: YORK YZ, YZ chiller, YZ mag bearing, SC-EQ, SE-SCC1001-1, OptiView
Source: YST SC-EQ BAS Points List · rev. Rev 1.2, 2021-12-08. Object names, instances and units are reproduced as published; descriptions are our own.