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Air-to-water modular heat pump (two-pipe) · BACnet points list

York YMAE Two-Pipe Modular Heat Pump BACnet points list

Updated 4 November 2026

Short answer

This is the BAS points list for the two-pipe YMAE, which heats or cools (not both at once). It gives BACnet objects next to N2 and Modbus addresses: on/off and mode commands, entering and leaving water setpoints, control settings, 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. The four-pipe YMAE has its own list.

This page lists 69 BACnet objects for the York YMAE Two-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 Two-Pipe Modular Heat Pump
Equipment
Air-to-water modular heat pump (two-pipe)
Equipment type
Heat pumps
BACnet objects
69 (13 writable)
Transport
—
Firmware
Not stated
Also known as
YORK YMAE, YMAE two pipe, YMAE 2-pipe, air-to-water heat pump
Source document
YMAE Two Pipe Points List · rev. Rev 1.0, 2023-08-24
Download CSV 69 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 YMAE Two-Pipe Modular Heat Pump

Integration in brief

Enable BAS start/stop and mode at the HMI (MV 6 and MV 5 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 3 for actual on/off, chiller loading, the chiller leaving water temperature, BV 5 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.

ObjectNameWhyAccess
MV 1CHILLER ON|OFF (CMD)On/off command (1 = on, 2 = off)Write
MV 2RUNNING MODEMode: cooling, heating, pump onlyWrite
AV 3COOL LWT SETPOINTCooling leaving water setpointWrite
AV 4HEAT LWT SETPOINTHeating leaving water setpointWrite
BV 3CHILLER ON|OFF (STATUS)Actual on/off statusRead
MV 6CHILLER ON|OFF CONTROL SELECTIONOn/off source; must include BAS (set at HMI)Read
AV 114CHILLER LOADINGChiller loading, %Read
AV 111CHILLER LWTChiller leaving water temperatureRead
BV 5FAULTUnit fault (1 = alarm)Read
AV 109UNIT FAULT STATUS (1-16)Fault flags for modules 1-16, bit-codedRead

Enable & remote start

BAS start/stop and operating-mode control are enabled at the HMI. MV 6 (on/off source: HMI, Remote, HMI+BAS) and MV 5 (mode source: HMI, Remote, HMI+BAS, BAS) show the selection and are read-only over the network.

Network setup

Watch out for

York YMAE Two-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.

69 of 69 shown
Type
AnalogBinaryMulti-state
Access
Show
York YMAE Two-Pipe Modular Heat Pump BACnet Points List
DescriptionStates
MVmin1CHILLER ON|OFF (CMD)Chiller on/off commandWrite0=Invalid, 1=On, 2=Off
MVmin2RUNNING MODERunning ModeWrite0=Cooling, 1=Heating, 8=Pump Only
AV1COOL EWT SETPOINTCool Entering Water Temperature Setpoint, 23.0-77.0 °F°FWrite
AV2HEAT EWT SETPOINTHeat Entering Water Temperature Setpoint, 68.0-131.0 °F°FWrite
AVmin3COOL LWT SETPOINTCool Leaving Water Temperature Setpoint, 14.0-68.0 °F°FWrite
AVmin4HEAT LWT SETPOINTHeat Leaving Water Temperature Setpoint, 77.0-140.0 °F°FWrite
BV1NOISE REDUCTIONNoise ReductionWrite0=Off, 1=On
MV3COOLING CONTROL SELECTCooling Control SelectWrite0=EWT control, 1=LWT control
MV4HEATING CONTROL SELECTHeating Control SelectWrite0=EWT control, 1=LWT control
AV5TEMP CONTROL CYCLETemperature Control Cycle, 20-120 SecSecWrite
AV6WATER TEMP CONTROL DIFFWater Temperature Control Differential, 1.8-5.4 °F (diff)°F (diff)Write
AV7EWT PULLDOWN RATE SELECTEntering water temp pulldown rate select, 0-6Write
AV8MODULE NUMBERModule number to read, 1-32Write
MV5CHILLER MODE CONTROL SELECTIONChiller Mode Control SelectionRead0=HMI, 1=Remote, 2=HMI+BAS, 3=BAS
MVmin6CHILLER ON|OFF CONTROL SELECTIONChiller on/off control selectionRead0=HMI, 1=Remote, 2=HMI+BAS
BVmin3CHILLER ON|OFF (STATUS)Chiller on/off statusRead0=Off, 1=On
MV101SYSTEM STATUSSystem StatusRead0=Cooling, 1=Heating, 8=Pump Only
AV102OTHER STATUSOther StatusRead
BV4HMI COMMUNICATION STATUSHuman Machine Interface Comm. StatusRead0=Offline, 1=Online
AV104UNIT NETWORK STATUS (1-16)Network status of units 1-16, bit-codedRead
AVmin109UNIT FAULT STATUS (1-16)Fault status of units 1-16, bit-codedRead
AV110CHILLER EWTChiller Entering Water Temperature°FRead
AVmin111CHILLER LWTChiller Leaving Water Temperature°FRead
AV113AMBIENT TEMPAmbient Temperature°FRead
AVmin114CHILLER LOADINGChiller Loading%Read
AV117TOTAL RUN HOURSTotal Run HoursHoursRead
AV121UNIT NETWORK STATUS (17-32)Network status of units 17-32, bit-codedRead
AV122UNIT FAULT STATUS (17-32)Fault status of units 17-32, bit-codedRead
AV123UNIT QUANTITYUnit QuantityRead
BVmin5FAULTUnit fault (no Modbus function code)Read0=Normal, 1=Alarm
AV1021UNIT EWTUnit Entering Water Temperature°FRead
AV1023CKT1 COIL TEMPCircuit 1 Coil Temperature°FRead
AV1024CKT2 COIL TEMPCircuit 2 Coil Temperature°FRead
AV1025UNIT LWTUnit Leaving Water Temperature°FRead
AV1027CKT1 SUCT TEMPCircuit 1 Suction Temperature°FRead
AV1028CKT2 SUCT TEMPCircuit 2 Suction Temperature°FRead
AV1029SYS 1 DISCHARGE TEMPSystem 1 Discharge Temp°FRead
AV1030CKT1 ECO ENTERING TEMPCircuit 1 Economizer Entering Temp°FRead
AV1031SYS 2 DISCHARGE TEMPSystem 2 Discharge Temp°FRead
AV1032CKT2 ECO ENTERING TEMPCircuit 2 Economizer Entering Temp°FRead
AV1033CKT1 ECO LEAVING TEMPCircuit 1 Economizer Leaving Temp°FRead
AV1034CKT2 ECO LEAVING TEMPCircuit 2 Economizer Leaving Temp°FRead
AV1036R454B Relative LFLR454B leak sensor, % of lower flammable limit%Read
AV1040CKT1 SUCT PRSCircuit 1 Suction PressurePSIGRead
AV1041CKT2 SUCT PRSCircuit 2 Suction PressurePSIGRead
AV1042CKT1 DISCH PRSCircuit 1 Discharge PressurePSIGRead
AV1043CKT2 DISCH PRSCircuit 2 Discharge PressurePSIGRead
AV1053DI17-32Digital inputs 17-32, bit-codedRead
AV1054DI1-16Digital inputs 1-16, bit-codedRead
AV1055DO17-33Digital outputs 17-32, bit-codedRead
AV1056DO1-16Digital outputs 1-16, bit-codedRead
AV1057CKT1 EEVCircuit 1 electronic expansion valve opening, stepsRead
AV1058CKT2 EEVCircuit 2 electronic expansion valve opening, stepsRead
AV1059CKT1 ECO EEVCircuit 1 economizer EEV opening, stepsRead
AV1060CKT2 ECO EEVCircuit 2 economizer EEV opening, stepsRead
AV1065CKT1 FAN SPEEDCircuit 1 Fan SpeedRPMRead
AV1066CKT2 FAN SPEEDCircuit 2 Fan SpeedRPMRead
AV1073DIAL SWITCH STATUSDial Switch StatusRead
AV1080CKT1 INV COMP FREQCircuit 1 Inverter Compressor FrequencyHzRead
AV1096CKT2 INV COMP FREQCircuit 2 Inverter Compressor FrequencyHzRead
AV1155FAULT STATUS 1Fault status word 1, bit-codedReadBit 0=Unit 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 leaving water temperature sensor fault, Bit 5=Chiller 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 9=Circuit 1 economizer entering temperature sensor fault, Bit 10=Circuit 2 compressor 1 discharge port temperature sensor fault, Bit 11=Circuit 2 economizer entering temperature sensor fault, Bit 12=Circuit 1 economizer leaving temperature sensor fault, Bit 13=Circuit 2 economizer leaving temperature sensor fault, Bit 15=R454B leakage sensor Fault (1=fault)
AV1156FAULT STATUS 2Fault status word 2, bit-codedReadBit 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)
AV1157FAULT STATUS 3Fault status word 3, bit-codedReadBit 7=External interlock fault, Bit 8=Power fault, Bit 11=Unit Water flow fault (1=fault)
AV1158FAULT STATUS 4Fault status word 4, bit-codedRead
AV1159FAULT STATUS 5Fault status word 5, bit-codedReadBit 0=Communication failure (Follower unit with leader), Bit 1=Communication failure (BAS), 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 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)
AV1160FAULT STATUS 6Fault status word 6, bit-codedReadBit 0=Circuit 1 compressor 1 high discharge port temperature, Bit 2=Circuit 2 compressor 1 high discharge port temperature, Bit 8=Circuit 1 brazed plate heat exchanger anti-freeze protect, Bit 9=Circuit 2 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)
AV1161FAULT STATUS 7Fault status word 7, bit-codedReadBit 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=Circuit 1 driver fault or inverter compressor fault, Bit 6=Circuit 2 driver fault or inverter compressor fault, Bit 7=Circuit 1 fan driver fault, Bit 8=Circuit 2 fan driver fault, Bit 11=Circuit 1 VSD heat dissipation alarm, Bit 12=Circuit 2 VSD heat dissipation alarm (1=fault)
AV1162FAULT STATUS 8Fault status word 8, bit-codedReadBit 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, Bit 8=Water filter cleaning reminde, Bit 9=VSD cleaning reminder, Bit 10=Refrigerant leakage alarm (R454B) (1=fault)
AV1163CHILLER MODEL NUMBERChiller Model NumberRead
Object ID lookup: York YMAE two-pipe 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 YMAE Two-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 Two-Pipe Modular Heat Pump

How many BACnet points does the York YMAE Two-Pipe Modular Heat Pump have?

This list has 69 BACnet objects: 58 analog values, 4 binary values, 7 multi-state values. The exact set on a given unit depends on its firmware, installed options and configuration.

Which York YMAE Two-Pipe Modular Heat Pump BACnet points are writable?

13 of the 69 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 Two-Pipe Modular Heat Pump BACnet documentation?

The source is YMAE Two Pipe Points List, revision Rev 1.0, 2023-08-24, published free by York at https://docs.johnsoncontrols.com/chillers/api/khub/documents/cCyKNapISIvyShxh1Z~l5g/content.

What are the minimum BACnet points to integrate the York YMAE Two-Pipe Modular Heat Pump?

Start with MV 1 CHILLER ON|OFF (CMD) (On/off command (1 = on, 2 = off)); MV 2 RUNNING MODE (Mode: cooling, heating, pump only); AV 3 COOL LWT SETPOINT (Cooling leaving water setpoint); AV 4 HEAT LWT SETPOINT (Heating leaving water setpoint); BV 3 CHILLER ON|OFF (STATUS) (Actual on/off status); MV 6 CHILLER ON|OFF CONTROL SELECTION (On/off source; must include BAS (set at HMI)); AV 114 CHILLER LOADING (Chiller loading, %); AV 111 CHILLER LWT (Chiller leaving water temperature); BV 5 FAULT (Unit fault (1 = alarm)); 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 Two-Pipe Modular Heat Pump?

BAS start/stop and operating-mode control are enabled at the HMI. MV 6 (on/off source: HMI, Remote, HMI+BAS) and MV 5 (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 Two-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

Source: YMAE Two Pipe Points List · rev. Rev 1.0, 2023-08-24. Object names, instances and units are reproduced as published; descriptions are our own.