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Air-to-water modular heat pump (four-pipe) · BACnet points list
York YMAE Four-Pipe Modular Heat Pump BACnet points list
Updated 28 October 2026
The YMAE is the YORK by Johnson Controls modular air-to-water heat pump with inverter compressors; the four-pipe version heats and cools at the same time. Its BAS points list gives BACnet objects next to N2 and Modbus addresses: on/off and mode commands, entering and leaving water setpoints for cooling and heating, chiller-level status and temperatures, and module-level circuit values and bit-coded fault words. Module data is read one module at a time through AV 8.
This page lists 72 BACnet objects for the York YMAE Four-Pipe Modular Heat Pump — 13 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
- YMAE Four-Pipe Modular Heat Pump
- Equipment
- Air-to-water modular heat pump (four-pipe)
- Equipment type
- Heat pumps
- BACnet objects
- 72 (13 writable)
- Transport
- —
- Firmware
- Not stated
- Also known as
- YORK YMAE, YMAE-130, YMAE four pipe, air-to-water heat pump
- Source document
- YMAE Four Pipe Points List · rev. Rev 1.1, 2023-08-24
BMS integration notes: York YMAE Four-Pipe Modular Heat Pump
Enable BAS start/stop and mode at the HMI (MV 4 and MV 3 show the selection), then switch the unit with MV 1 and pick the mode with MV 2. Write the leaving (or entering) water setpoints for cooling and heating, and read BV 100 for actual on/off, chiller loading, the chiller leaving water temperatures and the unit fault words.
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 |
|---|---|---|---|
| MV 1 | CHILLER ON|OFF (CMD) | On/off command (1 = on, 2 = off, as printed) | Write |
| MV 2 | RUNNING MODE | Mode: cooling, heating, pump only, both | Write |
| AV 3 | COOL LWT SETPOINT | Cooling leaving water setpoint | Write |
| AV 4 | HEAT LWT SETPOINT | Heating leaving water setpoint | Write |
| MV 4 | CHILLER ON|OFF CONTROL SELECTION | On/off source; must include BAS (set at HMI) | Read |
| BV 100 | CHILLER ON|OFF (STATUS) | Actual on/off status | Read |
| AV 114 | CHILLER LOADING | Chiller loading, % | Read |
| AV 111 | CHILLER COOL LWT | Chiller cooling leaving water temperature | Read |
| AV 119 | CHILLER HEAT LWT | Chiller heating leaving water temperature | Read |
| AV 109 | UNIT FAULT STATUS (1-16) | Fault flags for modules 1-16, bit-coded | Read |
Enable & remote start
BAS start/stop and operating-mode control are enabled at the HMI. MV 4 (on/off source: HMI, Remote, HMI+BAS) and MV 3 (mode source: HMI, Remote, HMI+BAS, BAS) show the selection and are read-only over the network.
Network setup
- The sheet's notes describe the microboard's Modbus RTU link: 9600 baud, 8 data bits, no parity, 1 stop bit; the BAS is the leader and module 1's microboard the follower. BAS addresses are set at the HMI.
- BV 5 and BV 6 show whether cooling and heating control on entering or leaving water temperature; write the matching setpoints (AV 1/AV 2 or AV 3/AV 4).
Watch out for
- MV 1 only commands on/off; read the real state from BV 100.
- A BAS setpoint can be outside the unit's default range; read the setpoints back from the unit after writing.
- Data defaults to the leader module (No. 1). Write AV 8 to view another module's values; per-module AVs then show that module.
York YMAE Four-Pipe Modular Heat Pump 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.
| Description | States | |||||
|---|---|---|---|---|---|---|
| MVmin | 1 | CHILLER ON|OFF (CMD) | Chiller on/off command | Write | 0=Invalid, 1=On, 2=Off | |
| MVmin | 2 | RUNNING MODE | Running Mode | Write | 0=Cooling, 1=Heating, 8=Pump Only, 9=Cooling+Heating | |
| AV | 1 | COOL EWT SETPOINT | Cool Entering Water Temperature Setpoint, 19.4-86.0 °F | °F | Write | |
| AV | 2 | HEAT EWT SETPOINT | Heat Entering Water Temperature Setpoint, 59.0-131.0 °F | °F | Write | |
| AVmin | 3 | COOL LWT SETPOINT | Cool Leaving Water Temperature Setpoint, 14.0-68.0 °F | °F | Write | |
| AVmin | 4 | HEAT LWT SETPOINT | Heat Leaving Water Temperature Setpoint, 77.0-140.0 °F | °F | Write | |
| BV | 1 | NOISE REDUCTION | Noise Reduction | Write | 0=Off, 1=On | |
| BV | 5 | COOLING CONTROL SELECT | Cooling Control Select | Write | 0=Manual EWT control, 1=Manual LWT control | |
| BV | 6 | HEATING CONTROL SELECT | Heating Control Select | Write | 0=Manual EWT control, 1=Manual LWT control | |
| AV | 5 | TEMP CONTROL CYCLE | Temperature Control Cycle, 10-120 Sec | Sec | Write | |
| AV | 6 | WATER TEMP CONTROL DIFF | Water Temperature Control Differential, 1.8-5.4 °F (diff) | °F (diff) | Write | |
| AV | 7 | EWT PULLDOWN RATE SELECT | Entering Water Temperature Pulldown Rate Select, 0-6 | Write | ||
| AV | 8 | MODULE NUMBER | Module number to read (1-32) | Write | ||
| MV | 3 | CHILLER MODE CONTROL SELECTION | Chiller Mode Control Selection | Read | 0=HMI, 1=Remote, 2=HMI+BAS, 3=BAS | |
| MVmin | 4 | CHILLER ON|OFF CONTROL SELECTION | Chiller ON/OFF Control Selection | Read | 0=HMI, 1=Remote, 2=HMI+BAS | |
| BVmin | 100 | CHILLER ON|OFF (STATUS) | Chiller on/off status | Read | 0=Off, 1=On | |
| MV | 101 | SYSTEM STATUS | System Status | Read | 0=Cooling, 1=Heating, 8=Pump Only, 9=Cooling+Heating | |
| AV | 102 | OTHER STATUS | Other Status | Read | ||
| BV | 103 | HMI COMMUNICATION STATUS | Human Machine Interface Communication Status | Read | 0=Offline, 1=Online | |
| AV | 104 | UNIT NETWORK STATUS (1-16) | Network status of units 1-16, bit-coded | Read | ||
| AVmin | 109 | UNIT FAULT STATUS (1-16) | Fault status of units 1-16, bit-coded | Read | ||
| AV | 110 | CHILLER COOL EWT | Chiller Cool Entering Water Temp | °F | Read | |
| AVmin | 111 | CHILLER COOL LWT | Chiller Cool Leaving Water Temp | °F | Read | |
| AV | 113 | AMBIENT TEMP | Ambient Temperature | °F | Read | |
| AVmin | 114 | CHILLER LOADING | Chiller Loading | % | Read | |
| AV | 117 | TOTAL RUN HOURS | Total Run Hours | Hours | Read | |
| AV | 118 | CHILLER HEAT EWT | Chiller Heat Entering Water Temp | °F | Read | |
| AVmin | 119 | CHILLER HEAT LWT | Chiller Heat Leaving Water Temp | °F | Read | |
| AV | 121 | UNIT NETWORK STATUS (17-32) | Network status of units 17-32, bit-coded | Read | ||
| AV | 122 | UNIT FAULT STATUS (17-32) | Fault status of units 17-32, bit-coded | Read | ||
| AV | 123 | UNIT QUANTITY | Unit Quantity | Read | ||
| AV | 1021 | UNIT COOL EWT | Unit Cool Entering Water Temp | °F | Read | |
| AV | 1023 | CKT1 COIL TEMP | Circuit 1 Coil Temperature | °F | Read | |
| AV | 1024 | CKT2 COIL TEMP | Circuit 2 Coil Temperature | °F | Read | |
| AV | 1025 | UNIT COOL LWT | Unit Cool Leaving Water Temp | °F | Read | |
| AV | 1027 | CKT1 SUCT TEMP | Circuit 1 Suction Temperature | °F | Read | |
| AV | 1028 | CKT2 SUCT TEMP | Circuit 2 Suction Temperature | °F | Read | |
| AV | 1029 | SYS 1 DISCHARGE TEMP | System 1 Discharge Temp | °F | Read | |
| AV | 1033 | CKT1 ECO ENTERING TEMP | Circuit 1 Economizer Entering Temp | °F | Read | |
| AV | 1031 | SYS 2 DISCHARGE TEMP | System 2 Discharge Temp | °F | Read | |
| AV | 1035 | CKT2 ECO ENTERING TEMP | Circuit 2 Economizer Entering Temp | °F | Read | |
| AV | 1034 | CKT1 ECO LEAVING TEMP | Circuit 1 Economizer Leaving Temp | °F | Read | |
| AV | 1036 | CKT2 ECO LEAVING TEMP | Circuit 2 Economizer Leaving Temp | °F | Read | |
| AV | 1200 | R454B RELATIVE LFL | R454B leak sensor, % of lower flammable limit | % | Read | |
| AV | 1037 | UNIT HEAT LWT | Unit Heat Leaving Water Temp | °F | Read | |
| AV | 1039 | UNIT HEAT EWT | Unit Heat Entering Water Temp | °F | Read | |
| AV | 1040 | CKT1 SUCT PRS | Circuit 1 Suction Pressure | PSIG | Read | |
| AV | 1041 | CKT2 SUCT PRS | Circuit 2 Suction Pressure | PSIG | Read | |
| AV | 1042 | CKT1 DISCH PRS | Circuit 1 Discharge Pressure | PSIG | Read | |
| AV | 1043 | CKT2 DISCH PRS | Circuit 2 Discharge Pressure | PSIG | Read | |
| AV | 1053 | DI17-32 | Digital inputs 17-32, bit-coded | Read | ||
| AV | 1054 | DI1-16 | Digital inputs 1-16, bit-coded | Read | ||
| AV | 1055 | DO17-33 | Digital outputs 17-32, bit-coded | Read | ||
| AV | 1056 | DO1-16 | Digital outputs 1-16, bit-coded | Read | ||
| AV | 1057 | CKT1 EEV | Circuit 1 electronic expansion valve opening, steps | Read | ||
| AV | 1058 | CKT2 EEV | Circuit 2 electronic expansion valve opening, steps | Read | ||
| AV | 1059 | CKT1 ECO EEV | Circuit 1 economizer EEV opening, steps | Read | ||
| AV | 1060 | CKT2 ECO EEV | Circuit 2 economizer EEV opening, steps | Read | ||
| AV | 1065 | CKT1 FAN SPEED | Circuit 1 Fan Speed | RPM | Read | |
| AV | 1066 | CKT2 FAN SPEED | Circuit 2 Fan Speed | RPM | Read | |
| AV | 1073 | DIAL SWITCH STATUS | Dial Switch Status | Read | ||
| AV | 1080 | CKT1 INV COMP FREQ | Circuit 1 Inverter Compressor Frequency | Hz | Read | |
| AV | 1096 | CKT2 INV COMP FREQ | Circuit 2 Inverter Compressor Frequency | Hz | Read | |
| AV | 1155 | FAULT STATUS 1 | Fault status word 1, bit-coded | Read | Bit 0=Unit cooling entering water temperature sensor fault, Bit 1=Ambient temperature sensor fault, Bit 2=Circuit 1 coil temperature sensor fault, Bit 3=Circuit 2 coil temperature sensor fault, Bit 4=Unit cooling leaving water temperature sensor fault, Bit 5=Chiller cooling leaving water temperature sensor fault, Bit 6=Circuit 1 accumulator inlet temperature sensor fault, Bit 7=Circuit 2 accumulator inlet temperature sensor fault, Bit 8=Circuit 1 compressor 1 discharge port temperature sensor fault, Bit 10=Circuit 2 compressor 1 discharge port temperature sensor fault, Bit 12=Circuit 1 economizer entering temperature sensor fault, Bit 13=Circuit 1 economizer leaving temperature sensor fault, Bit 14=Circuit 2 economizer entering temperature sensor fault, Bit 15=Circuit 2 economizer leaving temperature sensor fault (1=fault) | |
| AV | 1156 | FAULT STATUS 2 | Fault status word 2, bit-coded | Read | Bit 0=Unit heating leaving water temperature sensor fault, Bit 1=Chiller heating leaving water temperature sensor fault, Bit 2=Unit heating entering water temperature sensor fault, Bit 3=Circuit 1 low pressure transducer fault, Bit 4=Circuit 2 low pressure transducer fault, Bit 5=Circuit 1 high pressure transducer fault, Bit 6=Circuit 2 high pressure transducer fault (1=fault) | |
| AV | 1157 | FAULT STATUS 3 | Fault status word 3, bit-coded | Read | Bit 0=Circuit 1 fan motor fault, Bit 1=Circuit 2 fan motor fault, Bit 2=Circuit 1 high pressure switch fault, Bit 3=Circuit 1 low pressure switch fault, Bit 4=Chiller cooling Water flow fault, Bit 7=External interlock fault, Bit 8=Power fault, Bit 9=Circuit 2 high pressure switch fault, Bit 10=Circuit 2 low pressure switch fault, Bit 11=Unit cooling Water flow fault, Bit 12=Unit heating Water flow fault, Bit 13=Chiller heating Water flow fault (1=fault) | |
| AV | 1158 | FAULT STATUS 4 | Fault status word 4, bit-coded | Read | ||
| AV | 1159 | FAULT STATUS 5 | Fault status word 5, bit-coded | Read | Bit 0=Communication failure (Follower unit with leader), Bit 1=Chiller Dial Switch setting error, Bit 2=Time limit protection, Bit 3=Low ambient temperature in cooling, Bit 4=High ambient temperature in heating, Bit 5=Chiller low leaving temperature in cooling, Bit 6=Chiller high leaving temperature in heating, Bit 7=Chiller locking, Bit 8=Communication failure (FCU with leader), Bit 10=Unit low leaving temperature in cooling, Bit 12=Unit high leaving temperature in heating, Bit 14=Unit low leaving temperature in heatinging (1=fault) | |
| AV | 1160 | FAULT STATUS 6 | Fault status word 6, bit-coded | Read | Bit 0=Circuit 1 compressor 1 high discharge port temperature, Bit 2=Circuit 2 compressor 1 high discharge port temperature, Bit 8=Circuit 1 cooling brazed plate heat exchanger anti-freeze protect, Bit 9=Circuit 2 Cooling brazed plate heat exchanger anti-freeze protect, Bit 10=Circuit 1 heating brazed plate heat exchanger anti-freeze protect, Bit 11=Circuit 2 heating brazed plate heat exchanger anti-freeze protect, Bit 14=Circuit 1 four way valve action failure, Bit 15=Circuit 2 four way valve action failure (1=fault) | |
| AV | 1161 | FAULT STATUS 7 | Fault status word 7, bit-coded | Read | Bit 0=Unit Dial Switch setting error, Bit 1=Communication failure (unit with circuit 1 driver), Bit 2=Communication failure (unit with circuit 1 fan), Bit 3=Communication failure (unit with circuit 2 fan), Bit 4=Communication failure (unit with circuit 2 driver), Bit 5=Driver fault or inverter compressor fault, Bit 7=Circuit 1 fan motor overspeed, Bit 8=Circuit 2 fan motor overspeed, Bit 9=Circuit 1 fan motor underspeed, Bit 10=Circuit 2 fan motor underspeed, Bit 11=Circuit 1 VSD heat dissipation alarm, Bit 12=Circuit 2 VSD heat dissipation alarm, Bit 13=Communication failure (Mainboard with Expansion Board) (1=fault) | |
| AV | 1162 | FAULT STATUS 8 | Fault status word 8, bit-coded | Read | Bit 2=Circuit 1 High pressure alarm, Bit 3=Circuit 2 High pressure alarm, Bit 4=Circuit 1 Low discharge pressure alarm, Bit 5=Circuit 2 Low discharge pressure alarm, Bit 6=Circuit 1 Low pressure alarm, Bit 7=Circuit 2 Low pressure alarm (1=fault) | |
| AV | 1163 | CHILLER MODEL NUMBER | Chiller Model Number | Read |
No points match these filters.
Integration notes
- Access comes from the Modbus function code column: points written with function 06 are marked writable, function 03 points read-only.
- The sheet does not name the BACnet interface or transport; its notes describe the unit's Modbus RTU link (9600 baud, 8-N-1) with the BAS as leader.
- Writable setpoint ranges (IP units) are in the descriptions; SI ranges are in the sheet.
- All MV enums are printed in the points table and the sheet has no add-1 note. Multistate states with their own enum in the points table 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).
- The Fault point in the sheet has no BACnet object and 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 YMAE Four-Pipe Modular Heat Pump 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 YMAE Four-Pipe Modular Heat Pump
How many BACnet points does the York YMAE Four-Pipe Modular Heat Pump have?
This list has 72 BACnet objects: 62 analog values, 5 binary values, 5 multi-state values. The exact set on a given unit depends on its firmware, installed options and configuration.
Which York YMAE Four-Pipe Modular Heat Pump BACnet points are writable?
13 of the 72 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 YMAE Four-Pipe Modular Heat Pump BACnet documentation?
The source is YMAE Four Pipe Points List, revision Rev 1.1, 2023-08-24, published free by York at https://docs.johnsoncontrols.com/chillers/api/khub/documents/DAKAK2ryzuHrZbBA1Ny6_A/content.
What are the minimum BACnet points to integrate the York YMAE Four-Pipe Modular Heat Pump?
Start with MV 1 CHILLER ON|OFF (CMD) (On/off command (1 = on, 2 = off, as printed)); MV 2 RUNNING MODE (Mode: cooling, heating, pump only, both); AV 3 COOL LWT SETPOINT (Cooling leaving water setpoint); AV 4 HEAT LWT SETPOINT (Heating leaving water setpoint); MV 4 CHILLER ON|OFF CONTROL SELECTION (On/off source; must include BAS (set at HMI)); BV 100 CHILLER ON|OFF (STATUS) (Actual on/off status); AV 114 CHILLER LOADING (Chiller loading, %); AV 111 CHILLER COOL LWT (Chiller cooling leaving water temperature); AV 119 CHILLER HEAT LWT (Chiller heating leaving water temperature); AV 109 UNIT FAULT STATUS (1-16) (Fault flags for modules 1-16, bit-coded).
How do I enable BMS control of the York YMAE Four-Pipe Modular Heat Pump?
BAS start/stop and operating-mode control are enabled at the HMI. MV 4 (on/off source: HMI, Remote, HMI+BAS) and MV 3 (mode source: HMI, Remote, HMI+BAS, BAS) show the selection and are read-only over the network.
How do I check these points on the real YMAE Four-Pipe Modular Heat Pump?
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 - 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 - 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: YMAE Four Pipe Points List · rev. Rev 1.1, 2023-08-24. Object names, instances and units are reproduced as published; descriptions are our own.