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Water-cooled magnetic-bearing centrifugal chiller (via SC-EQ card) · BACnet points list
York YMC2 Magnetic-Bearing Centrifugal Chiller (SC-EQ) BACnet points list
Updated 28 October 2026
The YMC2's SC-EQ card puts the chiller on a BACnet MS/TP trunk (or Modbus RTU / N2). Besides run/stop, the leaving chilled liquid setpoint and the input current limit, it exposes VSD input and output data, harmonic distortion, magnetic bearing (MBC) levitation and speed, VGD/PRV positions and the operation, fault and warning codes. Some points apply only to Mod A or Mod B chillers.
This page lists 112 BACnet objects for the York YMC2 Magnetic-Bearing Centrifugal 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
- YMC2 Magnetic-Bearing Centrifugal Chiller (SC-EQ)
- Equipment
- Water-cooled magnetic-bearing centrifugal chiller (via SC-EQ card)
- Equipment type
- Chillers
- BACnet objects
- 112 (5 writable)
- Transport
- BACnet MS/TP
- Firmware
- SC-EQ software 4.2.0.20
- Default device instance
- 5000 + MAC address
- Also known as
- YMC2, YORK YMC2, YMC², SC-EQ, SC-EQUIP, SE-SCC1001-1
- Source document
- YMC2 SC-EQ BAS Points List · rev. Rev 2.11, 2021-12-08
BMS integration notes: York YMC2 Magnetic-Bearing Centrifugal Chiller (SC-EQ)
Wire the BAS to the SC-EQ J12 RS-485 port, set the MAC address on the DIP switch and let the card detect BACnet MS/TP. Write the remote run/stop, leaving chilled liquid setpoint and input current limit, then read motor run status, the operation code, leaving chilled liquid temperature, % FLA and the safety fault code. Check MV 5 and MV 10-13 to confirm the chiller is taking its commands from the BAS.
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 CHL TEMP SP | Remote leaving chilled liquid setpoint | Command |
| AV 2 | REMOTE INPUT CURRENT SP | Remote input current limit, % | Command |
| MV 1 | UNIT OPERATION CODE | Operating state (stopped, starting, running) | Read |
| BV 5 | COMPR MOTOR STATUS | Compressor motor running | Read |
| MV 5 | UNIT CONTROL SOURCE | Control source; ISN (BAS) for BMS control | Read |
| AV 5 | LEAVING CH LIQ TEMP | Leaving chilled liquid temperature | Read |
| AV 29 | MOTOR CURRENT PCT FLA | Motor current, % FLA (load indication) | 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 the REM AVs are the remote setpoints. MV 5 Unit Control Source shows Local, ISN (BAS), Analog, Digital, Modem or Remote. MV 10 shows the run/stop source (Local, BAS, Hardwire) and MV 11-13 the cooling setpoint, heating setpoint and current limit sources (Local, BAS, 0-10 V, 4-20 mA, PWM); check they read BAS. 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.
- Turn the card's RS-485 end-of-line switches on only when it is at the end of the trunk.
Watch out for
- The BAS port is RS-485 only (BACnet MS/TP, Modbus RTU or N2); the card has no BACnet IP port.
- Points marked Mod A or Mod B only appear on that chiller generation.
- Remote setpoints show as unreliable until the BAS has written them once.
- The card only exposes points that apply to the detected chiller and its options. Replacing an E-Link leaves the old, non-applicable points offline in the BAS until you rediscover the device.
- Code points come in pairs: the MV state is the code + 1, and the AV copy (AV 401 and up) carries the raw code.
York YMC2 Magnetic-Bearing Centrifugal 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 CHL TEMP SP | Remote Leaving Chilled Liquid Setpoint | °F | Command | |
| AVmin | 2 | REMOTE INPUT CURRENT SP | Remote Input Current Limit Setpoint | % | Command | |
| AV | 3 | REM HEATING SP | Remote Heating Setpoint | °F | 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 CH LIQ TEMP | Leaving Chilled Liquid Temperature | °F | Read | |
| AV | 6 | ENTERING CH LIQ TEMP | Entering Chilled Liquid Temperature | °F | Read | |
| AV | 7 | LEAVING COND WATER TEMP | Leaving Condenser Liquid Temperature | °F | Read | |
| AV | 8 | ENTERING COND WATER TEMP | Entering Condenser Liquid Temperature | °F | Read | |
| AV | 9 | EVAPORATOR PRESSURE | Evaporator Pressure | PSIG | Read | |
| AV | 10 | CONDENSER PRESSURE | Condenser Pressure | PSIG | Read | |
| AV | 11 | DISCHARGE TEMP | Discharge Temperature | °F | Read | |
| AV | 12 | EVAP REFRIGERANT TEMP | Evaporator Refrigerant Temperature (Evaporator Refrigerant Temperature enabled only) | °F | Read | |
| AV | 13 | VSD PHASE A OUTPUT CURRENT | VSD Phase A Output Current (RMS) | Amps | Read | |
| AV | 14 | VSD PHASE B OUTPUT CURRENT | VSD Phase B Output Current (RMS) | Amps | Read | |
| AV | 15 | VSD PHASE C OUTPUT CURRENT | VSD Phase C Output Current (RMS) | Amps | Read | |
| AV | 17 | VSD RMS INPUT CURRENT L1 | VSD L1 Input Current (RMS) | Amps | Read | |
| AV | 18 | VSD RMS INPUT CURRENT L2 | VSD L2 Input Current (RMS) | Amps | Read | |
| AV | 19 | VSD RMS INPUT CURRENT L3 | VSD L3 Input Current (RMS) | Amps | Read | |
| AV | 20 | LEAVING CH LIQ TEMP ACT SP | Leaving Chilled Liquid Setpoint - Selected | °F | Read | |
| AV | 21 | INPUT CURRENT LMT ACTIVE | Active Input Current Limit | % | Read | |
| AV | 22 | EVAP SATURATION TEMP | Evaporator Saturation Temperature | °F | Read | |
| AV | 23 | COND SATURATION TEMP | Condenser Saturation Temperature | °F | Read | |
| AV | 24 | INPUT CURRENT PCT FLA | Input % Full Load Amps | % | Read | |
| AV | 25 | COND REFRIGERANT LEVEL | Condenser Refrigerant Level | % | Read | |
| AV | 26 | OPERATING HOURS | Operating Hours | Hr | Read | |
| AV | 27 | NUMBER OF STARTS | Number Of Starts | Read | ||
| AV | 28 | HOT GAS BYPASS VLV CMD | Hot Gas Bypass Command (Hot Gas Bypass enabled only) | % | Read | |
| AVmin | 29 | MOTOR CURRENT PCT FLA | Motor % Full Load Amps | % | Read | |
| BVmin | 5 | COMPR MOTOR STATUS | Motor Run | Read | 0=Off, 1=On | |
| BV | 6 | CH LIQ PUMP STAT | Chilled Liquid Pump | Read | 0=Off, 1=On | |
| BV | 7 | VSD COOLING SYS STAT | VSD Cooling System | Read | 0=Off, 1=On | |
| BV | 8 | RUN PERMISSIVE | Run Permissive | Read | 0=Off, 1=On | |
| BV | 9 | CH LIQ FLOW SWITCH STAT | Chilled Liquid Flow Switch | Read | 0=Open, 1=Closed | |
| BV | 10 | CND FLOW SWITCH STAT | Condenser Liquid Flow Switch | Read | 0=Open, 1=Closed | |
| BV | 11 | COND REF LEVEL CNTRL MODE | Condenser Level Control Valve Mode | Read | 0=Auto, 1=Manual | |
| BV | 12 | CND LIQ PUMP STAT | Condenser Liquid Pump | 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 - Soft Shutdown, 12=Unit Coastdown, 13=Unit Running - Modified Run, 14=Unit Stopped - Internal Shutdown, 16=Unit Running - Active Low Lift - No Abnormal Condition, 17=Unit Running - Active Low Lift - Warning Active, 18=Unit Running - Active Low Lift - Modified Run, 19=Unit Running - Passive Low Lift - No Abnormal Condition, 20=Unit Running - Passive Low Lift - Warning Active, 21=Unit Running - Passive Low Lift - Modified Run, 22=Unit Running - Cooling - No Abnormal Condition, 23=Unit Running - Cooling - Warning Active, 24=Unit Running - Cooling - Modified Run, 25=Unit Running - Heating - No Abnormal Condition, 26=Unit Running - Heating - Warning Active, 27=Unit Running - Heating - Modified Run, 28=Unit Running - Cooling & Heating - No Abnormal Condition, 29=Unit Running - Cooling & Heating - Warning Active, 30=Unit Running - Cooling & Heating - Modified Run | |
| AV | 401 | UNIT OPERATION CODE AV | Unit Operation Code, raw code (MV 1 shows code + 1) | Read | ||
| MVmin | 2 | UNIT SAFETY FAULT CODE | Unit Safety Fault Code | Read | 1=No Safety Faults Present; other values (up to 164) are YMC2 Safety Fault Code table SC.2 codes plus 1 (133 codes listed in the source doc) | |
| AV | 402 | UNIT SAFETY FAULT CODE AV | Unit Safety Fault Code, raw code (MV 2 shows code + 1) | Read | ||
| MVmin | 3 | UNIT CYCLING FAULT CODE | Unit Cycling Fault Code | Read | 1=No Cycling Faults Present; other values (up to 162) are YMC2 Cycling Fault Code table SC.3 codes plus 1 (111 codes listed in the source doc) | |
| AV | 403 | UNIT CYCLING FAULT CODE AV | Unit Cycling Fault Code, raw code (MV 3 shows code + 1) | Read | ||
| MV | 4 | UNIT WARNING CODE | Unit Warning Code | Read | 1=No Warnings Present, 2=WARNING - REAL TIME CLOCK FAILURE, 3=WARNING - SETPOINT OVERRIDE, 4=WARNING - CONDENSER OR EVAPORATOR XDCR ERROR, 5=WARNING - EVAPORATOR - LOW PRESSURE LIMIT, 6=WARNING - CONDENSER - HIGH PRESSURE LIMIT, 8=WARNING - YEARLY SERVICE REQUIRED - CONTACT JCI, 9=WARNING - 3 YEAR SERVICE REQUIRED - CONTACT JCI, 10=WARNING - CONDENSER - HIGH SMALL TEMP DIFFERENCE, 11=WARNING - MBC - LOW AMPLIFIER RESISTANCE, 12=WARNING - MBC - HIGH AMPLIFIER RESISTANCE, 13=WARNING - MBC - LOW AMPLIFIER CURRENT, 14=WARNING - MBC - HIGH AMPLIFIER CURRENT, 15=WARNING - MBC - POSITION SENSOR ERROR, 16=WARNING - MBC - J BEARING SENSOR DISABLED, 17=WARNING - MBC - K BEARING SENSOR DISABLED, 18=WARNING - MBC - H BEARING SENSOR DISABLED, 21=WARNING – UPS – NOT CHARGING, 22=WARNING – UPS – LINE LOW BATTERY VOLTAGE, 23=WARNING – UPS – BATTERY NOT CONNECTED, 24=WARNING – UPS – CHECK BATTERY CONNECTION, 25=WARNING – UPS – BATTERY TEST FAILED, 26=WARNING - SALES ORDER - INVALID SERIAL NUMBER, 30=WARNING - SURGE PROTECTION - EXCESS SURGE LIMIT, 31=WARNING - EXCESS SURGE DETECTED, 35=WARNING - CONDENSER OR VGD SENSOR FAILURE, 36=WARNING - HARMONIC FILTER - INVALID MODEL, 37=WARNING - HARMONIC FILTER - OPERATION INHIBITED, 38=WARNING - HARMONIC FILTER - DATA LOSS, 40=WARNING - HARMONIC FILTER - NOT RUNNING, 41=WARNING - MOTOR - HIGH WINDING TEMPERATURE, 42=WARNING - MOTOR - HIGH ROTOR TEMPERATURE, 45=WARNING - VSD - INPUT VOLTAGE IMBALANCE, 46=WARNING - VSD - HIGH HX APPROACH TEMPERATURE, 49=WARNING - MBC - LANDING COUNTER HIGH, 56=WARNING – MBC – CHECKSUM CENTERING, 57=WARNING – MBC – DSP WATCHDOG, 58=WARNING – MBC – AMP WATCHDOG, 59=WARNING – MBC – INTERNAL ALARM, 60=WARNING – MBC – HIGH RADIAL OSCILLATOR VOLTAGE, 61=WARNING – MBC – HIGH AXIAL OSCILLATOR VOLTAGE, 66=WARNING - MBC - ROTATION MODE OFF, 67=WARNING - MOTOR - HIGH CURRENT LIMIT, 68=WARNING - MOTOR - HIGH HOUSING TEMPERATURE, 69=WARNING - VSD - DC BUS ACTIVE, 70=WARNING - LIQUID LEVEL SETPOINT NOT ACHIEVED, 71=WARNING - LOSS OF SUBCOOLER LIQUID SEAL | |
| AV | 404 | UNIT WARNING CODE AV | Unit Warning Code, raw code (MV 4 shows code + 1) | Read | ||
| MVmin | 5 | UNIT CONTROL SOURCE | Unit Control Source | Read | 0=Local, 1=ISN (BAS), 2=Analog, 3=Digital, 4=Modem, 5=Remote | |
| AV | 405 | UNIT CONTROL SOURCE AV | Unit Control Source, same codes as MV 5 | Read | 0=Local, 1=ISN (BAS), 2=Analog, 3=Digital, 4=Modem, 5=Remote | |
| MV | 6 | UNIT MODIFIED RUN CODE | Unit Modified Run Code | Read | 1=No Modified Run Conditions Present, 2=VSD - DC BUS ACTIVE, 3=MOTOR - HIGH CURRENT LIMIT, 5=VSD - INPUT PULLDOWN LIMIT, 6=VSD - HIGH INPUT CURRENT LIMIT | |
| AV | 406 | UNIT MODIFIED RUN CODE AV | Unit Modified Run Code, raw code (MV 6 shows code + 1) | Read | ||
| MV | 7 | UNIT START INHIBIT CODE | Unit Start Inhibit Code | Read | 1=No Start Inhibits Present, 2=ANTI-RECYCLE, 4=VGD STROKE NOT CALIBRATED, 5=VGD FEEDBACK NOT CALIBRATED, 6=MBC - BEARING CALIBRATION IN PROGRESS, 7=MBC - BEARING CLEARANCE CHECK IN PROGRESS, 8=VSD - INITIALIZATION IN PROGRESS, 11=PRV NOT CALIBRATED, 13=VGD NOT CALIBRATED, 14=LINE VOLTAGE NOT SET, 15=LINE FREQUENCY NOT SET, 16=MBC - INITIALIZATION IN PROGRESS | |
| AV | 407 | UNIT START INHIBIT CODE AV | Unit Start Inhibit Code, raw code (MV 7 shows code + 1) | Read | ||
| MV | 8 | 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, 5=INTERNAL ERROR - CANNOT REGISTER CONTROL, 6=INTERNAL ERROR - INVALID BRAM | |
| AV | 408 | UNIT INTERNAL FAULT CODE AV | Unit Internal Fault Code, raw code (MV 8 shows code + 1) | Read | ||
| AV | 30 | VGD CONTROL STATE | VGD Control State (Mod A Chillers only) | Read | 0=[Unused], 1=Probing or Capacity Control, 2=Stall Reacting, 3=Stall Waiting, 4=Surge Reacting, 5=Surge Waiting, 6=Sensor Override, 7=[Unused], 8=PRV Position Override | |
| AV | 31 | VGD STALL COUNT | VGD Stall Count (Mod A Chillers only) | Read | ||
| AV | 32 | ACTIVE ANTI SURGE MIN FREQ | Active Anti-Surge Minimum Frequency | Hz | Read | |
| AV | 34 | VSD OUTPUT VOLTAGE | VSD Output Voltage | Volts | Read | |
| AV | 35 | VSD INPUT POWER | VSD Input Power | kW | Read | |
| AV | 36 | VSD INPUT KWH | VSD Input Kilowatt Hours | kWh | Read | |
| AV | 37 | VSD DC BUS VOLTAGE | VSD DC Bus Voltage | Volts | Read | |
| AV | 38 | VSD INPUT VOLTAGE L1 | VSD L1 Input Voltage (RMS) | Volts | Read | |
| AV | 39 | SURGE COUNT | Surge Count | Read | ||
| AV | 40 | VSD OUTPUT FREQUENCY | VSD Output Frequency | Hz | Read | |
| AV | 41 | VSD INPUT VOLTAGE L2 | VSD L2 Input Voltage (RMS) | Volts | Read | |
| AV | 42 | VSD INPUT VOLTAGE L3 | VSD L3 Input Voltage (RMS) | Volts | Read | |
| AV | 43 | COND LVL CTRL VLV CMD | Condenser Level Control Valve Command | % | Read | |
| BV | 26 | MBC LEVITATION MODE | MBC Levitation Mode | Read | 0=Off, 1=On | |
| BV | 27 | MBC ROTATION MODE | MBC Rotation Mode | Read | 0=Off, 1=On | |
| AV | 48 | MOTOR HOUSING TEMP | Motor Housing Temp | °F | Read | |
| AV | 107 | MOTOR COOLING VALVE CMD | Motor Cooling Valve Command (Mod A FAB comp & Mod B chillers) | % | Read | |
| AV | 108 | VSD INTERNAL AMBIENT TEMP 2 | VSD Internal Ambient Temperature 2 | °F | Read | |
| AV | 109 | MTR WINDING AVG TEMP | Average Motor Winding Temperature | °F | Read | |
| AV | 110 | VSD INTERNAL AMBIENT TEMP 1 | VSD Internal Ambient Temperature 1 | °F | Read | |
| AV | 111 | VGD POSITION | VGD Position | % | Read | |
| AV | 112 | PRE ROTATION VANES POS | Pre Rotation Vanes (PRV) Position (Mod A chiller FAA comp only) | % | Read | |
| AV | 113 | COND REFRIGERANT LEVEL SP | Condenser Active Level Setpoint | % | Read | |
| AV | 114 | DROP LEG REFRIG TEMP | Drop Leg Refrigerant Temperature | °F | Read | |
| AV | 115 | VSD L1 VOLTAGE THD | VSD L1 Voltage Total Harmonic Distortion | % | Read | |
| AV | 116 | VSD L2 VOLTAGE THD | VSD L2 Voltage Total Harmonic Distortion | % | Read | |
| AV | 117 | VSD L3 VOLTAGE THD | VSD L3 Voltage Total Harmonic Distortion | % | Read | |
| AV | 118 | VSD L1 INPUT CURRENT TDD | VSD L1 Input Current Total Demand Distortion | % | Read | |
| AV | 119 | VSD L2 INPUT CURRENT TDD | VSD L2 Input Current Total Demand Distortion | % | Read | |
| AV | 120 | VSD L3 INPUT CURRENT TDD | VSD L3 Input Current Total Demand Distortion | % | Read | |
| AV | 121 | INPUT KWH LO | Input Kilowatt Hours Low | Read | ||
| AV | 122 | INPUT KWH OFFSET | Input Kilowatt Hours Offset | Read | ||
| AV | 123 | OPERATING HOURS LO | Operating Hours Low | Read | ||
| AV | 124 | OPERATING HOURS OFFSET | Operating Hours Offset | Read | ||
| AV | 125 | MBC MOTOR SPEED | MBC Motor Speed | Hz | Read | |
| AV | 126 | MBC LANDING COUNTER | MBC Landing Counter (Mod A chillers only) | Read | ||
| AV | 127 | ACTIVE MIN PRV POS | Active Minimum PRV Position (Mod A chiller FAA comp only) | % | Read | |
| AV | 137 | UPS BATTERY VOLTAGE | UPS Battery Voltage (Mod B Chillers only) | Volts | Read | |
| AV | 138 | VSD PH A REC BASEPLATE TEMP | VSD Phase A Rectifier Baseplate Temperature | °F | Read | |
| AV | 139 | VSD PH B REC BASEPLATE TEMP | VSD Phase B Rectifier Baseplate Temperature | °F | Read | |
| AV | 140 | VSD PH C REC BASEPLATE TEMP | VSD Phase C Rectifier Baseplate Temperature | °F | Read | |
| AV | 141 | VSD PH A INV BASEPLATE TEMP | VSD Phase A Inverter Baseplate Temperature | °F | Read | |
| AV | 142 | VSD PH B INV BASEPLATE TEMP | VSD Phase B Inverter Baseplate Temperature | °F | Read | |
| AV | 143 | VSD PH C INV BASEPLATE TEMP | VSD Phase C Inverter Baseplate Temperature | °F | Read | |
| AV | 144 | EVAP SMALL TEMP DIFF | Evaporator Small Temp Difference | °F (diff) | Read | |
| AV | 145 | COND SMALL TEMP DIFF | Condenser Small Temp Difference | °F (diff) | Read | |
| AV | 146 | DISCHARGE SUPERHEAT | Discharge Superheat | °F (diff) | Read | |
| AV | 147 | SUBCOOLLER EFFECTIVENESS | Subcooler Effectiveness | Read | ||
| AV | 148 | SUBCOOLING TEMP | Subcooling Temperature | °F (diff) | Read | |
| AV | 149 | DELTA P DIV P | Delta P / P | Read | ||
| AV | 150 | HEAD PRESSURE | Head Pressure | PSID | Read | |
| MV | 10 | RUN STOP CTRL SOURCE | Run/Stop Control Source | Read | 0=Local, 1=BAS, 2=Hardwire | |
| AV | 421 | RUN STOP CTRL SOURCE AV | Run/Stop Control Source, same codes as MV 10 | Read | 0=Local, 1=BAS, 2=Hardwire | |
| MV | 11 | COOL SETP CTRL SOURCE | Cooling Setp Control Source | Read | 0=Local, 1=BAS, 2=0-10 Volts, 3=4-20 mA, 4=PWM | |
| AV | 422 | COOL SETP CTRL SOURCE AV | Cooling Setp Control Source, same codes as MV 11 | Read | 0=Local, 1=BAS, 2=0-10 Volts, 3=4-20 mA, 4=PWM | |
| MV | 12 | HEAT SETP CTRL SOURCE | Heating Setp Control Source | Read | 0=Local, 1=BAS, 2=0-10 Volts, 3=4-20 mA, 4=PWM | |
| AV | 423 | HEAT SETP CTRL SOURCE AV | Heating Setp Control Source, same codes as MV 12 | Read | 0=Local, 1=BAS, 2=0-10 Volts, 3=4-20 mA, 4=PWM | |
| MV | 13 | CURR LIM CTRL SOURCE | Current Limit Control Source | Read | 0=Local, 1=BAS, 2=0-10 Volts, 3=4-20 mA, 4=PWM | |
| AV | 424 | CURR LIM CTRL SOURCE AV | Current Limit Control Source, same codes as MV 13 | Read | 0=Local, 1=BAS, 2=0-10 Volts, 3=4-20 mA, 4=PWM |
No points match these filters.
Integration notes
- Points list for the SC-EQ (SC-EQUIP) communication card, which replaced the E-Link gateway. The list has no read/write column: the REM remote command/setpoint objects are treated as commandable and MV 65001 Units as writable; everything else as read-only.
- In the PDF the names of MV 11-13 and AV 422-424 overprint the enum text; the mixed-up letters spell COOL SETP CTRL SOURCE, HEAT SETP CTRL SOURCE and CURR LIM CTRL SOURCE (plus AV), as in the YK list.
- Operating hours and kWh are also split into Low and Offset AVs: total = Offset x 10,000 + Low.
- Units shown are the IP units; with MV 65001 set to SI the card reports °C, kPa and so on.
- 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; the AV copies (AV 401 and up) carry the raw code. 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.
- Long fault and warning code tables are summarised in the MV states; the full text is in the source document.
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 YMC2 Magnetic-Bearing Centrifugal 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 YMC2 Magnetic-Bearing Centrifugal Chiller (SC-EQ)
How many BACnet points does the York YMC2 Magnetic-Bearing Centrifugal Chiller (SC-EQ) have?
This list has 112 BACnet objects: 88 analog values, 11 binary values, 13 multi-state values. The exact set on a given unit depends on its firmware, installed options and configuration.
Which York YMC2 Magnetic-Bearing Centrifugal Chiller (SC-EQ) BACnet points are writable?
5 of the 112 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 YMC2 Magnetic-Bearing Centrifugal Chiller (SC-EQ) BACnet documentation?
The source is YMC2 SC-EQ BAS Points List, revision Rev 2.11, 2021-12-08, published free by York at https://docs.johnsoncontrols.com/chillers/api/khub/documents/5I6BffzkZybYzhNWLkSq1w/content.
What are the minimum BACnet points to integrate the York YMC2 Magnetic-Bearing Centrifugal Chiller (SC-EQ)?
Start with BV 1 REM RUN STOP CMD (Remote run/stop (1 = run)); AV 1 REM LEAVING CHL TEMP SP (Remote leaving chilled liquid setpoint); AV 2 REMOTE INPUT CURRENT SP (Remote input current limit, %); MV 1 UNIT OPERATION CODE (Operating state (stopped, starting, running)); BV 5 COMPR MOTOR STATUS (Compressor motor running); MV 5 UNIT CONTROL SOURCE (Control source; ISN (BAS) for BMS control); AV 5 LEAVING CH LIQ TEMP (Leaving chilled liquid temperature); AV 29 MOTOR CURRENT PCT FLA (Motor current, % FLA (load indication)); 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 YMC2 Magnetic-Bearing Centrifugal Chiller (SC-EQ)?
BV 1 REM RUN STOP CMD (0 = Stop, 1 = Run) is the BAS run/stop, and the REM AVs are the remote setpoints. MV 5 Unit Control Source shows Local, ISN (BAS), Analog, Digital, Modem or Remote. MV 10 shows the run/stop source (Local, BAS, Hardwire) and MV 11-13 the cooling setpoint, heating setpoint and current limit sources (Local, BAS, 0-10 V, 4-20 mA, PWM); check they read BAS. 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 YMC2 Magnetic-Bearing Centrifugal 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 - 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 - 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 - 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: YMC2 SC-EQ BAS Points List · rev. Rev 2.11, 2021-12-08. Object names, instances and units are reproduced as published; descriptions are our own.