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VRF hydronic module (air to water heat pump) gateway (BACnet IP) · BACnet points list
Midea IMMP-BAC(A) BACnet gateway - HTHM hydronic module device BACnet points list
Updated 7 November 2026
For a high-temperature hydronic module the IMMP-BAC(A) gateway publishes a separate BACnet IP device with heating and hot water on/off commands, their setpoints and locks, and water temperatures, pressures, compressor frequency and the error code.
This page lists 25 BACnet objects for the Midea IMMP-BAC(A) BACnet gateway - HTHM hydronic module device — 8 of them writable — with each object’s type, instance number, name, engineering units and access. It is re-typed from Midea’s own free documentation, linked below.
- Manufacturer
- Midea
- Model
- IMMP-BAC(A) BACnet gateway - HTHM hydronic module device
- Equipment
- VRF hydronic module (air to water heat pump) gateway (BACnet IP)
- Equipment type
- Heat pumps
- BACnet objects
- 25 (8 writable)
- Transport
- BACnet IP
- Firmware
- Not stated
- Also known as
- IMMP-BAC(A), K05.2-BACNET(A), IMMP-BAC-A
Reference only, provided as-is: verify against Midea’s current documentation and the live device before use. Not official Midea information. Terms of use.
BMS integration notes: Midea IMMP-BAC(A) BACnet gateway - HTHM hydronic module device
Map BV 90 and BV 91 to switch space heating and hot water, AV 51 and AV 50 for their setpoints, and read MI 56 mode, the water temperatures and AV 63 error code.
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 90 | Encendido/apagado de la calefacción | Space heating on/off | Write |
| BV 91 | Encendido/apagado del calentamiento del agua | Domestic hot water on/off | Write |
| AV 51 | Ajuste de temperatura de la calefacción | Heating water setpoint, 25-80 °C | Write |
| AV 50 | Ajuste de la temperatura de calentamiento del agua | Hot water setpoint, 25-80 °C | Write |
| MI 56 | Modo actual | Mode: 1=Off 4=Heating 6=Hot water | Read |
| AV 61 | Temperatura de salida del agua | Water outlet temperature, °C | Read |
| AV 62 | Temperatura del acumulador de agua | Hot water tank temperature, °C | Read |
| AV 63 | Código de error | Error code (1-260 = A0...UU) | Read |
Network setup
- Default gateway IP address is 192.168.1.8; change it on the gateway web page, then set a BACnet network number between 2 and 254 (unique per gateway) and restart the gateway for it to take effect.
- Unit device instances follow the network/port/address formula in the notes.
Watch out for
- The HTHM error code is an AV (AV 63), not an AI as on the indoor and outdoor devices.
Midea IMMP-BAC(A) BACnet gateway - HTHM hydronic module device 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 | |||||
|---|---|---|---|---|---|---|
| AVmin | 50 | Ajuste de la temperatura de calentamiento del agua | Domestic hot water setpoint, 25-80 °C | °C | Write | |
| AVmin | 51 | Ajuste de temperatura de la calefacción | Heating water setpoint, 25-80 °C | °C | Write | |
| AV | 52 | Bloqueo de la temperatura de la calefacción | Heating setpoint limit (0 = unlocked) | °C | Write | |
| AV | 53 | Bloqueo de la temperatura de calentamiento del agua | Hot water setpoint limit (0 = unlocked) | °C | Write | |
| AV | 60 | Temperatura de entrada del agua | Water inlet temperature | °C | Read | |
| AVmin | 61 | Temperatura de salida del agua | Water outlet temperature | °C | Read | |
| AVmin | 62 | Temperatura del acumulador de agua | Water tank temperature | °C | Read | |
| AVmin | 63 | Código de error | Error code (see code table) | Read | ||
| AV | 64 | Tf | Tf temperature | °C | Read | |
| AV | 65 | T2A | T2A temperature | °C | Read | |
| AV | 66 | T7 | T7 temperature | °C | Read | |
| AV | 67 | T7C | T7C temperature | °C | Read | |
| AV | 68 | Pe | Pe pressure | bar | Read | |
| AV | 69 | Pc | Pc pressure | bar | Read | |
| AV | 70 | EXV 1 | EXV 1 opening | Read | ||
| AV | 71 | EXV 2 | EXV 2 opening | Read | ||
| AV | 72 | Necesidad | HTHM demand | Read | ||
| AV | 73 | Potencia | Capacity | Read | ||
| AV | 75 | Frecuencia del compresor | Compressor frequency | Hz | Read | |
| AV | 76 | Versión del software | Software version | Read | ||
| MV | 78 | Bloqueo de la calefacción | Heating lock | Write | 1=Bloqueo ENCENDIDO, 2=Bloqueo APAGADO, 3=Desbloqueado | |
| MV | 79 | Bloqueo de calentamiento del agua | Hot water lock | Write | 1=Bloqueo ENCENDIDO, 2=Bloqueo APAGADO, 3=Desbloqueado | |
| MImin | 56 | Modo actual | Current mode | Read | 1=Apagado, 4=Calefacción, 6=Calentamiento del agua | |
| BVmin | 90 | Encendido/apagado de la calefacción | Heating on/off command | Write | 0=APAGADO, 1=ENCENDIDO | |
| BVmin | 91 | Encendido/apagado del calentamiento del agua | Hot water on/off command | Write | 0=APAGADO, 1=ENCENDIDO |
No points match these filters.
Object ID lookup: Midea IMMP-BAC point IDs by name
AV50Ajuste de la temperatura de calentamiento del aguaAV51Ajuste de temperatura de la calefacciónAV52Bloqueo de la temperatura de la calefacciónAV53Bloqueo de la temperatura de calentamiento del aguaAV60Temperatura de entrada del aguaAV61Temperatura de salida del aguaAV62Temperatura del acumulador de aguaAV63Código de errorAV64TfAV65T2AAV66T7AV67T7CAV68PeAV69PcAV70EXV 1AV71EXV 2AV72NecesidadAV73PotenciaAV75Frecuencia del compresorAV76Versión del softwareMV78Bloqueo de la calefacciónMV79Bloqueo de calentamiento del aguaMI56Modo actualBV90Encendido/apagado de la calefacciónBV91Encendido/apagado del calentamiento del agua
Integration notes
- The manual is in Spanish (Midea Spain); object names are kept as printed and the English descriptions are ours.
- Each unit is its own BACnet device. Indoor unit device instance = BACnet network number x 10000 + RS-485 port (0-3) x 1000 + indoor address (0-63); outdoor unit = network x 10000 + port x 1000 + 100 + outdoor address (0-31).
- Error codes are numbered 1-260 and map to the display codes A0...UU (blocks of 20 per letter).
- AV 70 is printed twice across a page break; it is listed once.
- AV 52/53 = 254 means the temperature cannot be adjusted.
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 IMMP-BAC(A) BACnet gateway - HTHM hydronic module device 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 Midea IMMP-BAC(A) BACnet gateway - HTHM hydronic module device
How many BACnet points does the Midea IMMP-BAC(A) BACnet gateway - HTHM hydronic module device have?
This list has 25 BACnet objects: 20 analog values, 2 binary values, 1 multi-state input, 2 multi-state values. The exact set on a given unit depends on its firmware, installed options and configuration.
Which Midea IMMP-BAC(A) BACnet gateway - HTHM hydronic module device BACnet points are writable?
8 of the 25 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 Midea IMMP-BAC(A) BACnet gateway - HTHM hydronic module device BACnet documentation?
The source is Manual de Instalación y de Usuario, Sistema de control IMMP-BAC(A) (K05.2-BACNET(A)) (210427_MI-MU_F-CTR_IMMP-BAC-A-ES), revision 2021-04, published free by Midea at https://www.midea.es/wp-content/uploads/2021/04/210427_MI-MU_F-CTR_IMMP-BAC-A-ES.pdf.
What are the minimum BACnet points to integrate the Midea IMMP-BAC(A) BACnet gateway - HTHM hydronic module device?
Start with BV 90 Encendido/apagado de la calefacción (Space heating on/off); BV 91 Encendido/apagado del calentamiento del agua (Domestic hot water on/off); AV 51 Ajuste de temperatura de la calefacción (Heating water setpoint, 25-80 °C); AV 50 Ajuste de la temperatura de calentamiento del agua (Hot water setpoint, 25-80 °C); MI 56 Modo actual (Mode: 1=Off 4=Heating 6=Hot water); AV 61 Temperatura de salida del agua (Water outlet temperature, °C); AV 62 Temperatura del acumulador de agua (Hot water tank temperature, °C); AV 63 Código de error (Error code (1-260 = A0...UU)).
How do I check these points on the real IMMP-BAC(A) BACnet gateway - HTHM hydronic module device?
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 Midea BACnet points lists
- VRF BACnet gateway (V8 indoor unit device)
Midea GW3-BAC gateway - V8 VRF indoor unit device
Midea V8 series VRF indoor units connected through the GW3-BAC gateway.
Also known as: GW3-BAC, Midea GW3-BAC IDU, Midea V8 BACnet gateway, Midea VRF V8 BACnet IP, Pasarela GW3-BAC - VRF BACnet gateway (V8 outdoor unit device)
Midea GW3-BAC gateway - V8 VRF outdoor unit device
Midea V8 series VRF outdoor units connected through the GW3-BAC gateway.
Also known as: GW3-BAC, Midea GW3-BAC ODU, Midea V8 outdoor unit BACnet, Midea VRF V8 BACnet IP - VRF indoor unit gateway (BACnet IP)
Midea IMMP-BAC(A) BACnet gateway - indoor unit device
Midea MDV VRF and commercial indoor units connected through the IMMP-BAC(A) building control gateway.
Also known as: IMMP-BAC(A), K05.2-BACNET(A), IMMP-BAC-A - VRF outdoor unit gateway (BACnet IP)
Midea IMMP-BAC(A) BACnet gateway - outdoor unit device
Midea MDV VRF outdoor units connected through the IMMP-BAC(A) building control gateway.
Also known as: IMMP-BAC(A), K05.2-BACNET(A), IMMP-BAC-A
Source: Manual de Instalación y de Usuario, Sistema de control IMMP-BAC(A) (K05.2-BACNET(A)) · 210427_MI-MU_F-CTR_IMMP-BAC-A-ES · rev. 2021-04. Object names, instances and units are reproduced as published; descriptions are our own.