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Air-cooled variable-speed screw chiller (via SC-EQ card) · BACnet points list
York YVAA Style B Chiller (SC-EQ) BACnet points list
Updated 28 October 2026
Short answer
YORK by Johnson Controls YVAA Style B chillers connect to a BAS through the SC-EQ communication card on BACnet MS/TP (or Modbus RTU / N2). The BAS can start/stop the chiller and write the cooling setpoint, current limit and sound limit. Read-only points cover chilled liquid and ambient temperatures, per-system pressures, temperatures, % FLA, power and alarms, VSD values, and multistate operational, fault and warning codes per system.
This page lists 102 BACnet objects for the York YVAA Style B Chiller (SC-EQ) — 5 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
- YVAA Style B Chiller (SC-EQ)
- Equipment
- Air-cooled variable-speed screw chiller (via SC-EQ card)
- Equipment type
- Chillers
- BACnet objects
- 102 (5 writable)
- Transport
- BACnet MS/TP
- Firmware
- SC-EQ software 4.9.0.12
- Default device instance
- 5000 + MAC address
- Also known as
- YORK YVAA, YVAA Style B, YVAA-B, SC-EQ, SE-SCC1001-1
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BMS integration notes: York YVAA Style B Chiller (SC-EQ)
Integration in brief
Put the chiller in remote control (BV 20 reads Remote), then start/stop it with BV 1 and write the cooling setpoint (AV 1) and current limit (AV 2). Read BV 5 for chiller run, leaving chilled liquid temperature and VSD frequency, and BV 15/BV 16 for system alarms; the per-system fault codes give the cause.
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 START STOP CMD | Remote start/stop (1 = run) | Command |
| AV 1 | REMOTE COOLING SETP | Remote leaving chilled liquid setpoint | Command |
| AV 2 | REM CURRENT LIMIT SETP | Remote current limit, % | Command |
| BV 20 | LOCAL REMOTE CONTROL MODE | Must read Remote (1) for BMS control | Read |
| BV 5 | CHILLER RUN | Chiller running | Read |
| AV 5 | LEAVING CHILLED LIQ TEMP | Leaving chilled liquid temperature | Read |
| AV 27 | VSD OUTPUT FREQUENCY | Compressor VSD frequency (load indication) | Read |
| BV 15 | SYS 1 ALARM | System 1 alarm active | Read |
| BV 16 | SYS 2 ALARM | System 2 alarm active | Read |
Enable & remote start
BV 20 shows Local or Remote control mode. The points list gives no point to change it and no write-enable point.
Heartbeat & communication loss
The operational code list includes 'Loss of External Communications'; the sheet gives no timeout or heartbeat point.
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.
- Fault/inhibit codes are per refrigerant system (MV 2, MV 4); there is no single unit fault code, so alarm on BV 15 and BV 16.
York YVAA Style B 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 | REMOTE COOLING SETP | Remote Cooling Setpoint | °F | Command | |
| AVmin | 2 | REM CURRENT LIMIT SETP | Remote Current Limit Setpoint | % | Command | |
| AV | 3 | REMOTE SOUND LIMIT | Remote Sound Limit | % | Command | |
| BVmin | 1 | REM START STOP CMD | Remote Start / Stop Command | 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 CHILLED LIQ TEMP | Leaving Chilled Liquid Temp | °F | Read | |
| AV | 6 | ENTERING CHILLED LIQ TEMP | Entering Chilled Liquid Temp | °F | Read | |
| AV | 7 | VSD INT AMBIENT TEMP | VSD Internal Ambient Temp | °F | Read | |
| AV | 8 | SYS 1 COND TEMP | Sys 1 Condenser Temperature | °F | Read | |
| AV | 9 | SYS 1 DISCH TEMP | Sys 1 Discharge Temperature | °F | Read | |
| AV | 10 | OUTSIDE AMBIENT AIR TEMP | Outside Ambient Air Temperature | °F | Read | |
| AV | 11 | SYS 1 EDUCTOR TEMP | Sys 1 Eductor Temperature | °F | Read | |
| AV | 12 | SYS 1 OIL PRESS | Sys 1 Oil Pressure | PSIG | Read | |
| AV | 13 | SYS 1 SUCT PRESS | Sys 1 Suction Pressure | PSIG | Read | |
| AV | 14 | SYS 1 DISCH PRESS | Sys 1 Discharge Pressure | PSIG | Read | |
| AV | 15 | SYS 1 COMP PCT FLA | Sys 1 Compressor % Full Load Amps | % | Read | |
| AV | 16 | SYS 1 HOURS | Sys 1 Total Run Hours | Hr | Read | |
| AV | 17 | SYS 1 STARTS | Sys 1 Total Number of Starts | Read | ||
| AV | 20 | SYS 2 EDUCTOR TEMP | Sys 2 Eductor Temperature | °F | Read | |
| AV | 21 | SYS 2 OIL PRESS | Sys 2 Oil Pressure | PSIG | Read | |
| AV | 22 | SYS 2 SUCT PRESS | Sys 2 Suction Pressure | PSIG | Read | |
| AV | 23 | SYS 2 DISCH PRESS | Sys 2 Discharge Pressure | PSIG | Read | |
| AV | 24 | SYS 2 COMP PCT FLA | Sys 2 Compressor % Full Load Amps | % | Read | |
| AV | 25 | SYS 2 HOURS | Sys 2 Total Run Hours | Hr | Read | |
| AV | 26 | SYS 2 STARTS | Sys 2 Total Number of Starts | Read | ||
| AVmin | 27 | VSD OUTPUT FREQUENCY | VSD Output Frequency | Hz | Read | |
| AV | 28 | SYS 1 COND DRAIN VALVE CMD | Sys 1 Condenser Drain Valve Command | % | Read | |
| AV | 29 | SYS 2 COND DRAIN VALVE CMD | Sys 2 Condenser Drain Valve Command | % | Read | |
| BVmin | 5 | CHILLER RUN | Chiller Run | Read | 0=Off, 1=On | |
| BV | 7 | EVAPORATOR HEATER STATUS | Evaporator Heater Status | Read | 0=Off, 1=On | |
| BV | 8 | EVAPORATOR PUMP STATUS | Evaporator Pump Status | Read | 0=Off, 1=On | |
| BV | 9 | SYS 1 COMP RUN STATUS | Sys 1 Compressor Run Status | Read | 0=Off, 1=On | |
| BV | 10 | SYS 2 COMP RUN STATUS | Sys 2 Compressor Run Status | Read | 0=Off, 1=On | |
| BV | 11 | SYS 1 VI STEP SOL VALVE 1 STATUS | Sys 1 VI Step Solenoid Valve 1 Status | Read | 0=Off, 1=On | |
| BV | 12 | SYS 2 VI STEP SOL VALVE 1 STATUS | Sys 2 VI Step Solenoid Valve 1 Status | Read | 0=Off, 1=On | |
| BV | 13 | SYS 1 VI STEP SOL VALVE 2 STATUS | Sys 1 VI Step Solenoid Valve 2 Status | Read | 0=Off, 1=On | |
| BV | 14 | SYS 2 VI STEP SOL VALVE 2 STATUS | Sys 2 VI Step Solenoid Valve 2 Status | Read | 0=Off, 1=On | |
| BVmin | 15 | SYS 1 ALARM | Sys 1 Alarm | Read | 0=No Alarm, 1=Alarm Active | |
| BVmin | 16 | SYS 2 ALARM | Sys 2 Alarm | Read | 0=No Alarm, 1=Alarm Active | |
| BV | 17 | EVAP ANTI-FREEZE FLOW SWITCH | Evap anti-freeze flow switch (anti-freeze pump option) | Read | 0=Off, 1=On | |
| BV | 18 | EVAP ANTI-FREEZE PUMP RUN | Evap anti-freeze pump run (anti-freeze pump option) | Read | 0=Off, 1=On | |
| BV | 19 | COOLING TYPE | Cooling Type | Read | 0=Water, 1=Glycol | |
| BVmin | 20 | LOCAL REMOTE CONTROL MODE | Local Remote Control Mode | Read | 0=Local, 1=Remote | |
| BV | 21 | DISPLAY UNITS | Display Units | Read | 0=Imperial, 1=SI | |
| BV | 22 | READY TO START | Ready To Start | Read | 0=Off, 1=On | |
| MV | 1 | SYS 1 OPERATIONAL CODE | Sys 1 Operational Code | Read | 64=Manual Override, 65=Daily Schedule Shutdown, 66=Unit Switch OFF, 67=Remote Controlled Shutdown, 68=Loss of External Communications, 69=Flow Switch Shutdown, 70=VSD Cooling Shutdown, 75=No Run Permissive, 76=Anti-Recycle Timer Active, 77=System Switch OFF, 78=System Not Running, 79=System Running, 80=Discharge Pressure Limiting, 81=Suction Pressure Limiting, 82=Motor Current Limiting, 83=Free Cooling, 84=BAS Motor Current Limiting, 85=Remote Motor Current Limiting, 86=System Shutting Down, 87=VSD PreCharging, 88=VSD Baseplate Temp Limiting, 89=VSD Internal Ambient Temp Limiting, 90=Sound Limiting, 91=BAS Sound Limiting, 92=Remote Sound Limiting, 93=Pulldown Motor Current Limiting, 94=Cooling Demand Shutdown, 95=Input Current Limiting, 96=BAS Input Current Limiting, 97=Remote Input Current Limiting, 98=Pulldown Input Current Limiting | |
| MV | 2 | SYS 1 FAULT CODE | Sys 1 Fault Code | Read | 1=No Faults/Inhbits Present, 2=Low Ambient Temperature, 3=High Ambient Temperature, 4=Low Chilled Liquid Temperature, 5=VSD Initialization Failure, 6=Low RTC Battery Voltage, 7=Invalid Number of Compressors Selected, 8=VSD Communications Failure, 9=Pre-charge Low DC Bus Voltage, 10=Pre-charge DC Bus Voltage Imbalance, 11=High DC Bus Voltage, 12=Low DC Bus Voltage, 13=DC Bus Voltage Imbalance, 14=High VSD Ambient Temperature, 15=Single Phase Input, 16=VSD Power Supply Fault, 17=VSD Logic Board Fault, 18=Motor Current Overload (Hardware), 19=CT Plug Fault, 20=High Harmonic Filter Temperature, 21=Evap Anti-Freeze Pump Fault, 22=Low Heat Exchanger Temperature, 23=Replace RTC Battery, 28=High Discharge Pressure (Software), 29=High Differential Oil Pressure, 30=Low Differential Oil Pressure, 31=Low Suction Pressure, 32=High Discharge Temperature, 34=Eductor Clog Fault, 35=Sensor Failure, 36=Low Motor Current, 37=High Motor Temperature, 38=Pre-charge Low DC Bus Voltage, 39=Pre-charge DC Bus Voltage Imbalance, 40=High DC Bus Voltage, 41=Low DC Bus Voltage, 42=DC Bus Voltage Imbalance, 43=High Motor Current, 44=Motor Current Overload, 45=IGBT Gate Driver Fault, 46=High Baseplate Temperature, 47=Single Phase Input, 48=VSD Run Signal Fault, 49=High Discharge Press, 50=Low Suction Superheat, 51=Control Voltage Fault, 52=Low Discharge Superheat, 53=Low Suction Pressure Smart Freeze, 54=Isolation Valve Failed to Close Warning, 55=Isolation Valve Failed to Open Fault, 56=High Discharge Pressure Rate, 57=Condenser Fan VSD Warning, 58=Low Economizer Superheat | |
| MV | 3 | SYS 2 OPERATIONAL CODE | Sys 2 Operational Code | Read | 64=Manual Override, 65=Daily Schedule Shutdown, 66=Unit Switch OFF, 67=Remote Controlled Shutdown, 68=Loss of External Communications, 69=Flow Switch Shutdown, 70=VSD Cooling Shutdown, 75=No Run Permissive, 76=Anti-Recycle Timer Active, 77=System Switch OFF, 78=System Not Running, 79=System Running, 80=Discharge Pressure Limiting, 81=Suction Pressure Limiting, 82=Motor Current Limiting, 83=Free Cooling, 84=BAS Motor Current Limiting, 85=Remote Motor Current Limiting, 86=System Shutting Down, 87=VSD PreCharging, 88=VSD Baseplate Temp Limiting, 89=VSD Internal Ambient Temp Limiting, 90=Sound Limiting, 91=BAS Sound Limiting, 92=Remote Sound Limiting, 93=Pulldown Motor Current Limiting, 94=Cooling Demand Shutdown, 95=Input Current Limiting, 96=BAS Input Current Limiting, 97=Remote Input Current Limiting, 98=Pulldown Input Current Limiting | |
| MV | 4 | SYS 2 FAULT CODE | Sys 2 Fault Code | Read | 1=No Faults/Inhbits Present, 2=Low Ambient Temperature, 3=High Ambient Temperature, 4=Low Chilled Liquid Temperature, 5=VSD Initialization Failure, 6=Low RTC Battery Voltage, 7=Invalid Number of Compressors Selected, 8=VSD Communications Failure, 9=Pre-charge Low DC Bus Voltage, 10=Pre-charge DC Bus Voltage Imbalance, 11=High DC Bus Voltage, 12=Low DC Bus Voltage, 13=DC Bus Voltage Imbalance, 14=High VSD Ambient Temperature, 15=Single Phase Input, 16=VSD Power Supply Fault, 17=VSD Logic Board Fault, 18=Motor Current Overload (Hardware), 19=CT Plug Fault, 20=High Harmonic Filter Temperature, 21=Evap Anti-Freeze Pump Fault, 22=Low Heat Exchanger Temperature, 23=Replace RTC Battery, 28=High Discharge Pressure (Software), 29=High Differential Oil Pressure, 30=Low Differential Oil Pressure, 31=Low Suction Pressure, 32=High Discharge Temperature, 34=Eductor Clog Fault, 35=Sensor Failure, 36=Low Motor Current, 37=High Motor Temperature, 38=Pre-charge Low DC Bus Voltage, 39=Pre-charge DC Bus Voltage Imbalance, 40=High DC Bus Voltage, 41=Low DC Bus Voltage, 42=DC Bus Voltage Imbalance, 43=High Motor Current, 44=Motor Current Overload, 45=IGBT Gate Driver Fault, 46=High Baseplate Temperature, 47=Single Phase Input, 48=VSD Run Signal Fault, 49=High Discharge Press, 50=Low Suction Superheat, 51=Control Voltage Fault, 52=Low Discharge Superheat, 53=Low Suction Pressure Smart Freeze, 54=Isolation Valve Failed to Close Warning, 55=Isolation Valve Failed to Open Fault, 56=High Discharge Pressure Rate, 57=Condenser Fan VSD Warning, 58=Low Economizer Superheat | |
| AV | 405 | SYS 1 COND FAN STAGE | Sys 1 Condenser Fan Stage (Staged Fans only) | Read | ||
| AV | 407 | SYS 2 COND FAN STAGE | Sys 2 Condenser Fan Stage (Staged Fans only) | Read | ||
| AV | 30 | ACTIVE LEAVING CHILL LIQ SETP | Active Leaving Chilled Liquid Setpoint | °F | Read | |
| AV | 31 | LOW LEAVING CHILL LIQ CUTOUT | Low Leaving Chilled Liquid Temp Cutout | °F | Read | |
| AV | 32 | SYS 1 ECON VALVE CMD | Sys 1 Economizer Valve Command | % | Read | |
| AV | 33 | SYS 2 ECON VALVE CMD | Sys 2 Economizer Valve Command | % | Read | |
| AV | 34 | LOW SUCT PRESS CUTOUT | Low Suction Pressure Cutout | PSIG | Read | |
| AV | 35 | VSD DC BUS VOLT | VSD DC Bus Voltage | Volts | Read | |
| AV | 37 | SYS 1 SUBCOOLING TEMP / SYS 1 EVAPORATOR LEVEL | Sys 1 subcooling (microchannel) or evaporator level (round tube) | °F (diff) / % | Read | |
| AV | 38 | COOLING RANGE | Cooling Range | °F (diff) | Read | |
| AV | 39 | SYS 1 DISCH SUPERHEAT | Sys 1 Discharge Superheat | °F (diff) | Read | |
| AV | 40 | SYS 2 COND TEMP | Sys 2 Condenser Temperature | °F | Read | |
| AV | 41 | SYS 2 DISCH TEMP | Sys 2 Discharge Temperature | °F | Read | |
| AV | 42 | SYS 2 SUBCOOLING TEMP / SYS 2 EVAPORATOR LEVEL | Sys 2 subcooling (microchannel) or evaporator level (round tube) | °F (diff) / % | Read | |
| AV | 43 | SYS 2 DISCH SUPERHEAT | Sys 2 Discharge Superheat | °F (diff) | Read | |
| BV | 25 | SYS 1 LOCKOUT | Sys 1 Lockout | Read | 0=Off, 1=On | |
| BV | 26 | SYS 2 LOCKOUT | Sys 2 Lockout | Read | 0=Off, 1=On | |
| BV | 27 | FLOW SWITCH STATUS | Flow Switch Status | Read | 0=Off, 1=On | |
| BV | 28 | LEAD SYSTEM NUMBER | Lead System Number | Read | 0=Sys 1, 1=Sys 2 | |
| AV | 49 | SYS 1 ECON TEMP | Sys 1 Economizer Temperature | °F | Read | |
| AV | 50 | SYS 2 ECON TEMP | Sys 2 Economizer Temperature | °F | Read | |
| AV | 51 | SYS 1 ECON PRESS | Sys 1 Economizer Pressure | PSIG | Read | |
| AV | 52 | SYS 2 ECON PRESS | Sys 2 Economizer Pressure | PSIG | Read | |
| AV | 53 | SYS 1 MOTOR TEMP 1 | Sys 1 Motor Temperature 1 | °F | Read | |
| AV | 54 | SYS 1 MOTOR TEMP 2 | Sys 1 Motor Temperature 2 | °F | Read | |
| AV | 55 | SYS 1 MOTOR TEMP 3 | Sys 1 Motor Temperature 3 | °F | Read | |
| AV | 56 | SYS 2 MOTOR TEMP 1 | Sys 2 Motor Temperature 1 | °F | Read | |
| AV | 57 | SYS 2 MOTOR TEMP 2 | Sys 2 Motor Temperature 2 | °F | Read | |
| AV | 58 | SYS 2 MOTOR TEMP 3 | Sys 2 Motor Temperature 3 | °F | Read | |
| AV | 59 | SYS 1 COND FAN SPEED CMD | Sys 1 Condenser Fan Speed Command (VSD Fans only) | % | Read | |
| AV | 60 | SYS 2 COND FAN SPEED CMD | Sys 2 Condenser Fan Speed Command (VSD Fans only) | % | Read | |
| AV | 70 | VSD FREQUENCY COMMAND | VSD Frequency Command | Hz | Read | |
| BV | 36 | SOFT SHUTDOWN | Soft Shutdown | Read | 0=Disabled, 1=Enabled | |
| BV | 37 | REMOTE EVAPORATOR | Remote Evaporator | Read | 0=Disabled, 1=Enabled | |
| BV | 38 | QUICK START | Quick Start | Read | 0=Disabled, 1=Enabled | |
| BV | 44 | SYS 1 COND FAN VSD FLT | Sys 1 condenser fan VSD fault (VSD fans) | Read | 0=Off, 1=On | |
| BV | 45 | SYS 2 COND FAN VSD FLT | Sys 2 condenser fan VSD fault (VSD fans) | Read | 0=Off, 1=On | |
| MV | 13 | SYS 1 SYSTEM STATE | Sys 1 System State | Read | 0=Stopped, 1=Running, 2=Faulted, 4=Locked Out, 5=Pre-Run | |
| MV | 14 | SYS 2 SYSTEM STATE | Sys 2 System State | Read | 0=Stopped, 1=Running, 2=Faulted, 4=Locked Out, 5=Pre-Run | |
| AV | 415 | SYS 1 SYSTEM STATE AV | Sys 1 System State AV | Read | 0=Stopped, 1=Running, 2=Faulted, 4=Locked Out, 5=Pre-Run | |
| AV | 416 | SYS 2 SYSTEM STATE AV | Sys 2 System State AV | Read | 0=Stopped, 1=Running, 2=Faulted, 4=Locked Out, 5=Pre-Run | |
| MV | 15 | SYS 1 WARNING CODE | Sys 1 Warning Code | Read | 1=No Faults/Inhbits Present, 2=Quarterly Service Required – Contact JCI, 3=Yearly Service Required – Contact JCI, 4=3 Year Service Required – Contact JCI, 5=5 Year Service Required – Contact JCI, 6=Replace Oil filter | |
| MV | 16 | SYS 2 WARNING CODE | Sys 2 Warning Code | Read | 1=No Faults/Inhbits Present, 2=Quarterly Service Required – Contact JCI, 3=Yearly Service Required – Contact JCI, 4=3 Year Service Required – Contact JCI, 5=5 Year Service Required – Contact JCI, 6=Replace Oil filter | |
| AV | 417 | SYS 1 WARNING CODE AV | Sys 1 Warning Code AV | Read | 0=No Faults/Inhbits Present, 1=Quarterly Service Required – Contact JCI, 2=Yearly Service Required – Contact JCI, 3=3 Year Service Required – Contact JCI, 4=5 Year Service Required – Contact JCI, 5=Replace Oil filter | |
| AV | 418 | SYS 2 WARNING CODE AV | Sys 2 Warning Code AV | Read | 0=No Faults/Inhbits Present, 1=Quarterly Service Required – Contact JCI, 2=Yearly Service Required – Contact JCI, 3=3 Year Service Required – Contact JCI, 4=5 Year Service Required – Contact JCI, 5=Replace Oil filter | |
| AV | 74 | SYS 1 FAN POWER | Sys 1 Fan Power | kW | Read | |
| AV | 75 | SYS 1 COMPRESSOR POWER | Sys 1 Compressor Power | kW | Read | |
| AV | 76 | SYS 2 FAN POWER | Sys 2 Fan Power | kW | Read | |
| AV | 77 | SYS 2 COMPRESSOR POWER | Sys 2 Compressor Power | kW | Read | |
| AV | 501 | SYS 1 OPERATIONAL CODE AV | Sys 1 Operational Code AV | Read | 63=Manual Override, 64=Daily Schedule Shutdown, 65=Unit Switch OFF, 66=Remote Controlled Shutdown, 67=Loss of External Communications, 68=Flow Switch Shutdown, 69=VSD Cooling Shutdown, 74=No Run Permissive, 75=Anti-Recycle Timer Active, 76=System Switch OFF, 77=System Not Running, 78=System Running, 79=Discharge Pressure Limiting, 80=Suction Pressure Limiting, 81=Motor Current Limiting, 82=Free Cooling, 83=BAS Motor Current Limiting, 84=Remote Motor Current Limiting, 85=System Shutting Down, 86=VSD PreCharging, 87=VSD Baseplate Temp Limiting, 88=VSD Internal Ambient Temp Limiting, 89=Sound Limiting, 90=BAS Sound Limiting, 91=Remote Sound Limiting, 92=Pulldown Motor Current Limiting, 93=Cooling Demand Shutdown, 94=Input Current Limiting, 95=BAS Input Current Limiting, 96=Remote Input Current Limiting, 97=Pulldown Input Current Limiting | |
| AV | 502 | SYS 1 FAULT CODE AV | Sys 1 Fault Code AV | Read | 0=No Faults/Inhbits Present, 1=Low Ambient Temperature, 2=High Ambient Temperature, 3=Low Chilled Liquid Temperature, 4=VSD Initialization Failure, 5=Low RTC Battery Voltage, 6=Invalid Number of Compressors Selected, 7=VSD Communications Failure, 8=Pre-charge Low DC Bus Voltage, 9=Pre-charge DC Bus Voltage Imbalance, 10=High DC Bus Voltage, 11=Low DC Bus Voltage, 12=DC Bus Voltage Imbalance, 13=High VSD Ambient Temperature, 14=Single Phase Input, 15=VSD Power Supply Fault, 16=VSD Logic Board Fault, 17=Motor Current Overload (Hardware), 18=CT Plug Fault, 19=High Harmonic Filter Temperature, 20=Evap Anti-Freeze Pump Fault, 21=Low Heat Exchanger Temperature, 22=Replace RTC Battery, 27=High Discharge Pressure (Software), 28=High Differential Oil Pressure, 29=Low Differential Oil Pressure, 30=Low Suction Pressure, 31=High Discharge Temperature, 33=Eductor Clog Fault, 34=Sensor Failure, 35=Low Motor Current, 36=High Motor Temperature, 37=Pre-charge Low DC Bus Voltage, 38=Pre-charge DC Bus Voltage Imbalance, 39=High DC Bus Voltage, 40=Low DC Bus Voltage, 41=DC Bus Voltage Imbalance, 42=High Motor Current, 43=Motor Current Overload, 44=IGBT Gate Driver Fault, 45=High Baseplate Temperature, 46=Single Phase Input, 47=VSD Run Signal Fault, 48=High Discharge Press, 49=Low Suction Superheat, 50=Control Voltage Fault, 51=Low Discharge Superheat, 52=Low Suction Pressure Smart Freeze, 53=Isolation Valve Failed to Close Warning, 54=Isolation Valve Failed to Open Fault, 55=High Discharge Pressure Rate, 56=Condenser Fan VSD Warning, 57=Low Economizer Superheat | |
| AV | 503 | SYS 2 OPERATIONAL CODE AV | Sys 2 Operational Code AV | Read | 63=Manual Override, 64=Daily Schedule Shutdown, 65=Unit Switch OFF, 66=Remote Controlled Shutdown, 67=Loss of External Communications, 68=Flow Switch Shutdown, 69=VSD Cooling Shutdown, 74=No Run Permissive, 75=Anti-Recycle Timer Active, 76=System Switch OFF, 77=System Not Running, 78=System Running, 79=Discharge Pressure Limiting, 80=Suction Pressure Limiting, 81=Motor Current Limiting, 82=Free Cooling, 83=BAS Motor Current Limiting, 84=Remote Motor Current Limiting, 85=System Shutting Down, 86=VSD PreCharging, 87=VSD Baseplate Temp Limiting, 88=VSD Internal Ambient Temp Limiting, 89=Sound Limiting, 90=BAS Sound Limiting, 91=Remote Sound Limiting, 92=Pulldown Motor Current Limiting, 93=Cooling Demand Shutdown, 94=Input Current Limiting, 95=BAS Input Current Limiting, 96=Remote Input Current Limiting, 97=Pulldown Input Current Limiting | |
| AV | 504 | SYS 2 FAULT CODE AV | Sys 2 Fault Code AV | Read | 0=No Faults/Inhbits Present, 1=Low Ambient Temperature, 2=High Ambient Temperature, 3=Low Chilled Liquid Temperature, 4=VSD Initialization Failure, 5=Low RTC Battery Voltage, 6=Invalid Number of Compressors Selected, 7=VSD Communications Failure, 8=Pre-charge Low DC Bus Voltage, 9=Pre-charge DC Bus Voltage Imbalance, 10=High DC Bus Voltage, 11=Low DC Bus Voltage, 12=DC Bus Voltage Imbalance, 13=High VSD Ambient Temperature, 14=Single Phase Input, 15=VSD Power Supply Fault, 16=VSD Logic Board Fault, 17=Motor Current Overload (Hardware), 18=CT Plug Fault, 19=High Harmonic Filter Temperature, 20=Evap Anti-Freeze Pump Fault, 21=Low Heat Exchanger Temperature, 22=Replace RTC Battery, 27=High Discharge Pressure (Software), 28=High Differential Oil Pressure, 29=Low Differential Oil Pressure, 30=Low Suction Pressure, 31=High Discharge Temperature, 33=Eductor Clog Fault, 34=Sensor Failure, 35=Low Motor Current, 36=High Motor Temperature, 37=Pre-charge Low DC Bus Voltage, 38=Pre-charge DC Bus Voltage Imbalance, 39=High DC Bus Voltage, 40=Low DC Bus Voltage, 41=DC Bus Voltage Imbalance, 42=High Motor Current, 43=Motor Current Overload, 44=IGBT Gate Driver Fault, 45=High Baseplate Temperature, 46=Single Phase Input, 47=VSD Run Signal Fault, 48=High Discharge Press, 49=Low Suction Superheat, 50=Control Voltage Fault, 51=Low Discharge Superheat, 52=Low Suction Pressure Smart Freeze, 53=Isolation Valve Failed to Close Warning, 54=Isolation Valve Failed to Open Fault, 55=High Discharge Pressure Rate, 56=Condenser Fan VSD Warning, 57=Low Economizer Superheat |
No points match these filters.
Integration notes
- Access is inferred: the sheet has no read/write column. The remote block (AV 1-3, BV 1) is treated as commandable and MV 65001 as writable; everything else as read-only.
- AV 37 and AV 42 mean subcooling on microchannel condensers and evaporator level on round-tube condensers; they are merged into one row each.
- Operational, fault and warning code MVs (MV 1-4, MV 15-16) use the Status Codes tables + 1, as the sheet says to add 1 for BACnet MSV values; the AV copies use the raw code.
- Multistate states with their own enum in the points table (Units, system state) are shown as printed, from 0. BACnet multistate values start at 1, so the device may report the printed number + 1; confirm by discovery (read the state text).
- Units shown are the IP units; with MV 65001 set to SI the card reports °C, bar and so on.
- The sheet also lists a Total Run Hours value (sum of both systems) with no BACnet object; it is 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. Easy BACnet scans a network for BACnet IP devices from an Android phone, reads every object on the YVAA Style B 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 YVAA Style B Chiller (SC-EQ)
How many BACnet points does the York YVAA Style B Chiller (SC-EQ) have?
This list has 102 BACnet objects: 66 analog values, 27 binary values, 9 multi-state values. The exact set on a given unit depends on its firmware, installed options and configuration.
Which York YVAA Style B Chiller (SC-EQ) BACnet points are writable?
5 of the 102 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 YVAA Style B Chiller (SC-EQ) BACnet documentation?
The source is YVAA Style B SC-EQ BAS Points List, revision Rev 1.8, 2023-03-20, published free by York at https://docs.johnsoncontrols.com/chillers/api/khub/documents/Cxf1tNmYudSglP~8DcXK7g/content.
What are the minimum BACnet points to integrate the York YVAA Style B Chiller (SC-EQ)?
Start with BV 1 REM START STOP CMD (Remote start/stop (1 = run)); AV 1 REMOTE COOLING SETP (Remote leaving chilled liquid setpoint); AV 2 REM CURRENT LIMIT SETP (Remote current limit, %); BV 20 LOCAL REMOTE CONTROL MODE (Must read Remote (1) for BMS control); BV 5 CHILLER RUN (Chiller running); AV 5 LEAVING CHILLED LIQ TEMP (Leaving chilled liquid temperature); AV 27 VSD OUTPUT FREQUENCY (Compressor VSD frequency (load indication)); BV 15 SYS 1 ALARM (System 1 alarm active); BV 16 SYS 2 ALARM (System 2 alarm active).
How do I enable BMS control of the York YVAA Style B Chiller (SC-EQ)?
BV 20 shows Local or Remote control mode. The points list gives no point to change it and no write-enable point.
Does the York YVAA Style B Chiller (SC-EQ) need a BACnet heartbeat or have a communication timeout?
The operational code list includes 'Loss of External Communications'; the sheet gives no timeout or heartbeat point.
How do I check these points on the real YVAA Style B 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
- 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 - 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 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 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 - 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 - 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 - Steam-turbine-driven centrifugal chiller (via SC-EQ card)
York YST Steam Turbine Chiller (SC-EQ)
YORK YST steam-turbine-driven centrifugal chillers fitted with the SC-EQ communication card.
Also known as: YORK YST, YST chiller, steam turbine drive chiller, SC-EQ, SE-SCC1001-1 - 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 - 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 - 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
Source: YVAA Style B SC-EQ BAS Points List · rev. Rev 1.8, 2023-03-20. Object names, instances and units are reproduced as published; descriptions are our own.