Daikin Applied · Chiller
Trailblazer AGZ/AMZ, Pathfinder AWS/AWV, ADS, Magnitude WME and Navigator WWV chillers (MicroTech III) Modbus register map
Default configuration
- Protocol
- RS485
- Port
- 502
- Unit ID
- 1
- Addressing
- 1-based
- Byte order
- Big endian
- Word order
- Low word first
- Baud rate
- 38400
- Parity
- None
- Data bits
- 8
- Stop bits
- 2
This device has an RS-485 interface. Reach it through a Modbus RTU-to-TCP gateway, configured with the factory serial settings above.
Register map
| Address | Count | Name | Type | Unit | Scale | Access |
|---|---|---|---|---|---|---|
| 8 | 1 | Chiller ON/OFF 0 = OFF, 1 = ON. | UInt16 | - | 1 | R |
| 1 | 1 | Chiller Local/Remote 0 = Remote, 1 = Local. Can only be changed on the unit keypad; when Local, the network setpoints are ignored. | UInt16 | - | 1 | R |
| 2 | 1 | Chiller Enable Output 0 = Disabled, 1 = Enabled. | UInt16 | - | 1 | R |
| 3 | 1 | Run Enabled 0 = OFF, 1 = Run Allowed. Indicates the chiller can start if operating conditions are met. | UInt16 | - | 1 | R |
| 4 | 1 | Chiller Capacity Limited 0 = Not Limited, 1 = Limited. | UInt16 | - | 1 | R |
| 5 | 1 | Alarm Digital Output 0 = No Alarm, 1 = Alarm. Must be polled for alarm notification. | UInt16 | - | 1 | R |
| 6 | 1 | Evaporator Flow Switch Status 0 = No Flow, 1 = Flow. | UInt16 | - | 1 | R |
| 7 | 1 | Condenser Flow Switch Status 0 = OFF, 1 = ON. | UInt16 | - | 1 | R |
| 9 | 1 | Chiller Enable Setpoint 0 = Disable, 1 = Enable, 2 = Null. Ignored when Chiller Local/Remote is Local. | UInt16 | - | 1 | RW |
| 10 | 1 | Clear Alarms - Network 0 = Normal, 1 = Clear Alarms, 2 = Null. Ignored when Chiller Local/Remote is Local. | UInt16 | - | 1 | RW |
| 11 | 1 | Chiller Mode Output 1 = Ice, 2 = Cool, 3 = Heat, 4 = Cool/Heat Recovery, 5 = Defrost. | UInt16 | - | 1 | R |
| 12 | 1 | Active Setpoint Setpoint the chiller is currently controlling to, after arbitration of the BAS, external and front-panel sources. Transmitted as °F x 10. | Int16 | °F | 0.1 | R |
| 13 | 1 | Actual Capacity Percent of maximum capacity currently produced. Transmitted as % x 10. | UInt16 | % | 0.1 | R |
| 14 | 1 | Active Capacity Limit Output Lowest of the capacity limits in force. Transmitted as % x 10. | UInt16 | % | 0.1 | R |
| 15 | 1 | Chiller Status 1 = OFF, 2 = Start, 3 = Run, 4 = Pre Shutdown, 5 = Service. | UInt16 | - | 1 | R |
| 16 | 1 | Evaporator Entering Fluid Temperature Fluid entering the evaporator. Transmitted as °F x 10. | Int16 | °F | 0.1 | R |
| 17 | 1 | Evaporator Leaving Fluid Temperature Fluid leaving the evaporator. Transmitted as °F x 10. | Int16 | °F | 0.1 | R |
| 18 | 1 | Evaporator Fluid Flow Rate Fluid flow through the evaporator (0 to 65,535 GPM). | UInt16 | GPM | 1 | R |
| 19 | 1 | Condenser Entering Fluid Temperature Fluid entering the condenser. Transmitted as °F x 10. | Int16 | °F | 0.1 | R |
| 20 | 1 | Condenser Leaving Fluid Temperature Fluid leaving the condenser. Transmitted as °F x 10. | Int16 | °F | 0.1 | R |
| 21 | 1 | Condenser Fluid Flow Rate Fluid flow through the condenser (0 to 65,535 GPM). | UInt16 | GPM | 1 | R |
| 24 | 1 | Outdoor Air Temperature Outdoor air temperature. Transmitted as °F x 10. | Int16 | °F | 0.1 | R |
| 25 | 1 | Chiller Current Average chiller current (0 to 10,000 A). | UInt16 | A | 1 | R |
| 27 | 1 | Total Kilowatts Total chiller power (0 to 3,500 kW). | UInt16 | kW | 1 | R |
| 34 | 1 | Chiller Mode Setpoint - Network 0 = Null, 1 = Ice, 2 = Cool, 3 = Heat, 4 = Cool/Heat Recovery. Ignored when Chiller Local/Remote is Local. | UInt16 | - | 1 | RW |
| 35 | 1 | Cool Setpoint - Network Cooling leaving-fluid setpoint (24.98 to 60.08 °F). Default 43.88 °F, transmitted as °F x 10. | Int16 | °F | 0.1 | RW |
| 36 | 1 | Ice Setpoint - Network Ice-mode leaving-fluid setpoint: 17.6 to 39.2 °F on AWS/AWV/WWV, 15.08 to 38.12 °F on AGZ/AMZ. Default 24.98 °F, transmitted as °F x 10. | Int16 | °F | 0.1 | RW |
| 38 | 1 | Capacity Limit Setpoint - Network Maximum capacity the chiller may deliver (0 to 100 %). Default 100 %, transmitted as % x 10. | UInt16 | % | 0.1 | RW |
| 1855 | 1 | Waterside Economizer Enable Setpoint 0 = Disable, 1 = Enable. Only used on units with the optional waterside economizer and when Chiller Local/Remote is Network. | UInt16 | - | 1 | RW |
| 1854 | 1 | Waterside Economizer State 0 = Off, 1 = Mech, 2 = Hybrid, 3 = WsEcon. Only on units with the optional waterside economizer. | UInt16 | - | 1 | R |
| 39 | 1 | Circuit 1 condenser refrigerant pressure Circuit 1 condenser pressure, transmitted as psi x 10 (0 to 410 psi; 700 psi on R-410A). | UInt16 | psi | 0.1 | R |
| 40 | 1 | Circuit 1 condenser saturated refrigerant temperature Circuit 1 saturated condenser temperature, transmitted as °F x 10. | Int16 | °F | 0.1 | R |
| 41 | 1 | Circuit 1 evaporator refrigerant pressure Circuit 1 evaporator pressure, transmitted as psi x 10 (-349.97 to 349.97 psi). | Int16 | psi | 0.1 | R |
| 1984 | 1 | Circuit 1 liquid line refrigerant temperature Circuit 1 liquid-line temperature, transmitted as °F x 10. | Int16 | °F | 0.1 | R |
| 1990 | 1 | Circuit 1 suction refrigerant temperature Refrigerant temperature entering the circuit 1 compressor (-40 to 230 °F). | Int16 | °F | 1 | R |
| 43 | 1 | Circuit 2 condenser refrigerant pressure Circuit 2 condenser pressure, transmitted as psi x 10 (0 to 410 psi; 700 psi on R-410A). | UInt16 | psi | 0.1 | R |
| 44 | 1 | Circuit 2 condenser saturated refrigerant temperature Circuit 2 saturated condenser temperature, transmitted as °F x 10. | Int16 | °F | 0.1 | R |
| 45 | 1 | Circuit 2 evaporator refrigerant pressure Circuit 2 evaporator pressure, transmitted as psi x 10 (-349.97 to 349.97 psi). | Int16 | psi | 0.1 | R |
| 63 | 1 | Compressor 1 suction refrigerant pressure Circuit 1 compressor 1 suction pressure, transmitted as psi x 10. | UInt16 | psi | 0.1 | R |
| 65 | 1 | Compressor 1 suction refrigerant temperature Refrigerant temperature entering circuit 1 compressor 1, transmitted as °F x 10. | Int16 | °F | 0.1 | R |
| 66 | 1 | Compressor 1 discharge refrigerant pressure Circuit 1 compressor 1 discharge pressure, transmitted as psi x 10. | UInt16 | psi | 0.1 | R |
| 68 | 1 | Compressor 1 discharge refrigerant temperature Circuit 1 compressor 1 discharge temperature, transmitted as °F x 10. | Int16 | °F | 0.1 | R |
| 69 | 1 | Compressor 1 percent RLA Current percent RLA of the circuit 1 compressor 1 motor. | UInt16 | % | 1 | R |
| 70 | 1 | Compressor 1 current Average current of the circuit 1 compressor 1 motor (0 to 10,000 A). | UInt16 | A | 1 | R |
| 71 | 1 | Compressor 1 voltage Average voltage of the circuit 1 compressor 1 motor (0 to 15,000 V). | UInt16 | V | 1 | R |
| 72 | 1 | Compressor 1 power Circuit 1 compressor 1 motor power (0 to 3,500 kW). | UInt16 | kW | 1 | R |
| 73 | 1 | Compressor 1 starts Number of times circuit 1 compressor 1 has been started (0 to 65,535). | UInt16 | starts | 1 | R |
| 74 | 2 | Compressor 1 run hours Operating hours of circuit 1 compressor 1; two holding registers, low word first (register 74 = 0x863C, 75 = 0x0001 for 99,900 h). | UInt32 | h | 1 | RW |
| 904 | 1 | Compressor 1 stator temperature 1 Motor stator sensor 1, transmitted as °F x 10. | Int16 | °F | 0.1 | R |
| 910 | 1 | Compressor 1 stator temperature 2 Motor stator sensor 2, transmitted as °F x 10. | Int16 | °F | 0.1 | R |
| 916 | 1 | Compressor 1 stator temperature 3 Motor stator sensor 3, transmitted as °F x 10. | Int16 | °F | 0.1 | R |
| 922 | 1 | Compressor 1 motor gap temperature Motor gap temperature, transmitted as °F x 10. | Int16 | °F | 0.1 | R |
| 928 | 1 | Compressor 1 motor case temperature Motor case temperature, transmitted as °F x 10. | Int16 | °F | 0.1 | R |
| 934 | 1 | Compressor 1 rotor pump temperature Rotor pump temperature, transmitted as °F x 10. | Int16 | °F | 0.1 | R |
| 940 | 1 | Compressor 1 lift temperature Lift temperature, transmitted as °F x 10. | Int16 | °F | 0.1 | R |
| 946 | 1 | Compressor 1 lift pressure Lift pressure, transmitted as psi x 10 (0 to 410 psi; 700 psi on R-410A). | UInt16 | psi | 0.1 | R |
| 970 | 1 | Compressor 1 unavailable 0 = Available, 1 = Unavailable. AWV units need application code 263220112 or newer. | UInt16 | - | 1 | R |
| 1849 | 1 | Compressor 1 oil feed pressure Oil feed pressure, transmitted as psi x 10. | UInt16 | psi | 0.1 | R |
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Related guides
Notes
Source: Daikin Applied "MicroTech Chiller Unit Controller - Protocol Information, Modbus Networks", ED 15121-12, October 2023 (https://tahoeweb.daikinapplied.com/api/general/DownloadDocumentByName/media/MicroTech%20Chiller%20UC%20Modbus%20Tech%20Sheet%20ED%2015121-12.pdf) and "MicroTech Chiller Unit Controller Modbus Communication Module" IM 969-7, October 2023 (https://tahoeweb.daikinapplied.com/api/general/DownloadDocumentByName/media/Daikin_Applied_IM_969-7_MT_Chiller_Modbus_Comm_Manual.pdf). Covers the shared MicroTech III chiller map; which points exist depends on the model and options (waterside economizer, number of circuits and compressors). The controller contains only holding registers (4xxxx): ED 15121-12 section "Register Mapping" states that the tables assume 4xxxx addressing and that holding register 40001 is shown as 1, so the numbers here are the supplier's one-based register numbers and the PDU address is one less. All values are 16-bit except the compressor run-hour counters, which span two registers with the low word first (worked example in "Modbus Data Point": 99,900 h at registers 74-75 gives 74 = 0x863C, 75 = 0x0001), hence word_order LowFirst. Rows whose range column carries an x10 mark are transmitted as ten times the engineering value, hence scale_factor 0.1. Serial settings are the communication module's factory values from IM 969-7 Table 3: address 1, 38400 bps, no parity, two stop bits. The unit is reached over RS-485 through a Modbus RTU-to-TCP gateway, so the native interface is RS-485. Circuit 2/3/4 and compressor 2/3 rows that repeat the same pattern were left out to keep the seed on the shared, most-used points; every address in the document is available for extension. Bit-level alarm registers are not modelled.