Easy BACnet
  1. Home
  2. BACnet points lists
  3. York
  4. Scroll Chiller / Heat Pump / Condensing Unit - BAS (ISN) E-Link (YorkTalk 2)

Scroll chiller / heat pump (via E-Link gateway) · BACnet points list

York Scroll Chiller / Heat Pump / Condensing Unit - BAS (ISN) E-Link (YorkTalk 2) BACnet points list

Updated 6 November 2026

Short answer

The E-Link gateway reads the scroll unit board over YorkTalk 2 (4800 baud) and serves BACnet, N2, LON and Modbus objects named by YorkTalk page: remote setpoint, load limit, heat pump mode and start/stop, liquid and refrigerant temperatures and pressures per system, run hours and status codes.

This page lists 92 BACnet objects for the York Scroll Chiller / Heat Pump / Condensing Unit - BAS (ISN) E-Link (YorkTalk 2) — 7 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
Scroll Chiller / Heat Pump / Condensing Unit - BAS (ISN) E-Link (YorkTalk 2)
Equipment
Scroll chiller / heat pump (via E-Link gateway)
Equipment type
Chillers
BACnet objects
92 (7 writable)
Transport
—
Firmware
Not stated
Also known as
YORK scroll chiller, YCWL, YLAE, Scroll BAS, E-Link, eLink, YorkTalk 2, 031-02550
Source document
Scroll BAS (ISN) E-Link points list · rev. 2020-02-11
Download CSV 92 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 Scroll Chiller / Heat Pump / Condensing Unit - BAS (ISN) E-Link (YorkTalk 2)

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 1YT2_S01_P07Remote start/stop (1 = run)Write
AV 1YT2_S01_P03Remote leaving chilled liquid setpointWrite
AV 2YT2_S01_P04Remote load limit stageWrite
BV 21YT2_S01_P52Must read Remote (1) for BMS controlRead
MV 1YT2_S01_P56System 1 operating codeRead
AV 5YT2_S01_P11Leaving chilled liquid temperatureRead
AV 6YT2_S01_P12Entering chilled liquid temperatureRead
MV 2YT2_S01_P57System 1 fault codeRead
BV 5YT2_S01_P36System 1 alarm (1 = alarm)Read

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 Scroll Chiller / Heat Pump / Condensing Unit - BAS (ISN) E-Link (YorkTalk 2) 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.

92 of 92 shown
Type
AnalogBinaryMulti-state
Access
Show
York Scroll Chiller / Heat Pump / Condensing Unit - BAS (ISN) E-Link (YorkTalk 2) BACnet Points List
DescriptionStates
AVmin1YT2_S01_P03Remote Setpoint / Sys 1 Remote Setpoint (SP Unit)°F / psiWrite99=Auto
AVmin2YT2_S01_P04Load Limit Stage [0, 1, 2] / Sys 1 Load Limit Stage [0, 1, 2]Write
AV3YT2_S01_P05Heating SP (HP) / cooling range (DAT unit) / Sys 2 SP (SP unit)°F / psiWrite
AV4YT2_S01_P06Remote Heatpump Mode (HP or YCWL HP) / Sys 2 Load Limit Stage [0, 1, 2]Write0=Pnl, 1=Cool, 2=Heat
BVmin1YT2_S01_P07Start/Stop Command / Sys 1 Start/Stop CommandWrite
BV2YT2_S01_P08Sys 2 Start/Stop CommandWrite
BV4YT2_S01_P10History Buffer RequestWrite
AVmin5YT2_S01_P11Leaving Chiller Liquid Temp°FRead
AVmin6YT2_S01_P12Entering Chilled Liquid Temp°FRead
AV7YT2_S01_P13Leaving Liquid Temp Hot (YCWL)°FRead
AV8YT2_S01_P14Discharge Air Temp (Cond Unit) / Entering Liquid Temp Hot (YCWL)°FRead
AV9YT2_S01_P15Sys 1 Suction Temperature (EEV)°FRead
AV10YT2_S01_P16Ambient Air Temperature°FRead
AV11YT2_S01_P17Sys 1 Suction Superheat (EEV)°FRead
AV12YT2_S01_P18Sys 1 Run Time in secondsRead
AV13YT2_S01_P19Sys 1 Suction PressurepsiRead
AV14YT2_S01_P20Sys 1 Discharge PressurepsiRead
AV15YT2_S01_P21Sys 1 Suction Temperature (Cond Unit) / Sys 1 Cooler Inlet Refrigerant Temp (R-407c)°FRead
AV16YT2_S01_P22Sys 1 Defrost Temperature (HP)°FRead
AV17YT2_S01_P23Sys 1 EEV Output % (EEV)%Read
AV18YT2_S01_P24Sys 1 Anti-Recycle TimerRead
AV19YT2_S01_P25Anti-Coincident Timer in secondsRead
AV20YT2_S01_P26Sys 2 Suction Temperature (EEV)°FRead
AV21YT2_S01_P27Sys 2 Run Time in secondsRead
AV22YT2_S01_P28Sys 2 Suction PressurepsiRead
AV23YT2_S01_P29Sys 2 Discharge PressurepsiRead
AV24YT2_S01_P30Sys 2 Suction Temperature (Cond Unit) / Sys 2 Cooler Inlet Refrigerant Temp (R-407c)°FRead
AV25YT2_S01_P31Sys 2 Defrost Temperature (HP)°FRead
AV26YT2_S01_P32Sys 2 Suction Superheat (EEV)°FRead
AV27YT2_S01_P33Sys 2 Anti-Recycle TimerRead
AV28YT2_S01_P34Sys 2 EEV Output % (EEV)%Read
AV29YT2_S01_P35Number of CompressorsRead
BVmin5YT2_S01_P36Sys 1 AlarmRead0=No Alarm, 1=Alarm
BV6YT2_S01_P37Sys 2 AlarmRead0=No Alarm, 1=Alarm
BV7YT2_S01_P38Evaporator Heater StatusRead
BV8YT2_S01_P39Evaporator Pump StatusRead
BV9YT2_S01_P40Sys 1 Comp 1 RunRead
BV10YT2_S01_P41Sys 2 Comp 1 RunRead
BV11YT2_S01_P42Sys 1 Liquid Line Solenoid Valve / Sys 1 Mode Solenoid Valve (HP)Read
BV12YT2_S01_P43Sys 1 Hot Gas Bypass ValveRead
BV13YT2_S01_P44Sys 1 Comp 2 RunRead
BV14YT2_S01_P45Sys 2 Comp 2 RunRead
BV15YT2_S01_P46Sys 2 Liquid Line Solenoid Valve / Sys 2 Mode Solenoid Valve (HP)Read
BV16YT2_S01_P47Lead SystemRead0=Sys1, 1=Sys2
BV17YT2_S01_P48Sys 1 Comp 3 RunRead
BV18YT2_S01_P49Sys 2 Comp 3 RunRead
BV19YT2_S01_P50Chilled Liquid TypeRead0=Water, 1=Glycol
BV20YT2_S01_P51Ambient Control ModeRead0=Std Amb, 1=Low Amb
BVmin21YT2_S01_P52Local/Remote Control ModeRead0=Local, 1=Remote
BV22YT2_S01_P53UnitsRead0=Imperial, 1=SI
BV23YT2_S01_P54Lead/Lag Control ModeRead0=Manual, 1=Auto
BV24YT2_S01_P55Sys 2 Hot Gas Bypass ValveRead
MVmin1YT2_S01_P56Sys 1 Operational CodeRead
MVmin2YT2_S01_P57Sys 1 Fault CodeRead
MV3YT2_S01_P58Sys 2 Operational CodeRead
MV4YT2_S01_P59Sys 2 Fault CodeRead
MV6YT2_S01_P61Sys 1 Condenser Fan StageRead
MV8YT2_S01_P63Sys 2 Condenser Fan StageRead
MV10YT2_S01_P65Unit Control ModeRead0=LW, 1=RW, 2=DA, 3=SP, 4=CL, 5=HT
AV30YT2_S01_P66Anti-Recycle Time ProgrammedRead
AV31YT2_S01_P67Leaving Chilled Liquid Temp Cutout°FRead
AV32YT2_S01_P68Low Ambient Temp Cutout°FRead
AV33YT2_S01_P69Low Suction Pressure Cutout Heating (HP)psiRead
AV34YT2_S01_P70Low Suction Pressure Cutout CoolingpsiRead
AV35YT2_S01_P71High Discharge Pressure CutoutpsiRead
AV36YT2_S01_P72Remote Setpoint°FRead
AV37YT2_S01_P73Cooling Range°FRead
AV38YT2_S01_P74Remote Setpoint 2 (SP) / Remote Heating Setpoint (HP and YCWL HP)psi / °FRead
AV39YT2_S01_P75Cooling Range 2 (SP) / Heating Range (HP and YCWL HP)psi / °FRead
AV40YT2_S01_P76Sys 1 Discharge Temperature (EEV)°FRead
AV41YT2_S01_P77Sys 1 Discharge Superheat (EEV)°FRead
AV42YT2_S01_P78Sys 2 Discharge Temperature (EEV)°FRead
AV43YT2_S01_P79Sys 2 Discharge Superheat (EEV)°FRead
BV25YT2_S01_P80Bivalent Heat Step (YLAE HP) / Compressor Heater (R-410a/R-454B chillers, YCWL chillers)Read
BV29YT2_S01_P84SCC Auto Detect AvailableRead
AV116YT2_S02_P18Sys 1 Comp 1 Run HoursRead
AV117YT2_S02_P19Sys 1 Comp 2 Run HoursRead
AV118YT2_S02_P20Sys 1 Comp 3 Run HoursRead
AV125YT2_S02_P27Sys 2 Comp 1 Run HoursRead
AV126YT2_S02_P28Sys 2 Comp 2 Run HoursRead
AV127YT2_S02_P29Sys 2 Comp 3 Run HoursRead
BV105YT2_S02_P36Option IndicatorRead0=Disabled, 1=Enabled
BV116YT2_S02_P47Expansion Valve TypeRead0=TXV, 1=EEV
BV117YT2_S02_P48YCWL ModeRead0=Chiller, 1=Heatpump
BV119YT2_S02_P50SCC Auto Detect Digit 1Read
BV120YT2_S02_P51SCC Auto Detect Digit 2Read
BV121YT2_S02_P52SCC Auto Detect Digit 3Read
BV122YT2_S02_P53SCC Auto Detect Digit 4Read
BV123YT2_S02_P54SCC Auto Detect Digit 5Read
BV124YT2_S02_P55SCC Auto Detect Digit 6Read
MV101YT2_S02_P56RefrigerantRead0=R-22, 1=R-407c, 2=R-410a, 3=R-454B
BV129YT2_S02_P84UnitsRead0=Imperial, 1=Metric
Object ID lookup: York Scroll 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 Scroll Chiller / Heat Pump / Condensing Unit - BAS (ISN) E-Link (YorkTalk 2) 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 Scroll Chiller / Heat Pump / Condensing Unit - BAS (ISN) E-Link (YorkTalk 2)

How many BACnet points does the York Scroll Chiller / Heat Pump / Condensing Unit - BAS (ISN) E-Link (YorkTalk 2) have?

This list has 92 BACnet objects: 49 analog values, 35 binary values, 8 multi-state values. The exact set on a given unit depends on its firmware, installed options and configuration.

Which York Scroll Chiller / Heat Pump / Condensing Unit - BAS (ISN) E-Link (YorkTalk 2) BACnet points are writable?

7 of the 92 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 Scroll Chiller / Heat Pump / Condensing Unit - BAS (ISN) E-Link (YorkTalk 2) BACnet documentation?

The source is Scroll BAS (ISN) E-Link points list, revision 2020-02-11, published free by York at https://docs.johnsoncontrols.com/chillers/api/khub/documents/oBPJz4ijvAYm6msOUI4wyg/content.

What are the minimum BACnet points to integrate the York Scroll Chiller / Heat Pump / Condensing Unit - BAS (ISN) E-Link (YorkTalk 2)?

Start with BV 1 YT2_S01_P07 (Remote start/stop (1 = run)); AV 1 YT2_S01_P03 (Remote leaving chilled liquid setpoint); AV 2 YT2_S01_P04 (Remote load limit stage); BV 21 YT2_S01_P52 (Must read Remote (1) for BMS control); MV 1 YT2_S01_P56 (System 1 operating code); AV 5 YT2_S01_P11 (Leaving chilled liquid temperature); AV 6 YT2_S01_P12 (Entering chilled liquid temperature); MV 2 YT2_S01_P57 (System 1 fault code); BV 5 YT2_S01_P36 (System 1 alarm (1 = alarm)).

How do I enable BMS control of the York Scroll Chiller / Heat Pump / Condensing Unit - BAS (ISN) E-Link (YorkTalk 2)?

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 Scroll Chiller / Heat Pump / Condensing Unit - BAS (ISN) E-Link (YorkTalk 2)?

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: Scroll BAS (ISN) E-Link points list · rev. 2020-02-11. Object names, instances and units are reproduced as published; descriptions are our own.