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- KTRBUu217.456 BACnet room controller - application 4HRKR001 / 4RAKR001 (4-pipe fan coil (alone or with radiator))
Room controller (fan coil) · BACnet points list
ALRE KTRBUu217.456 BACnet room controller - application 4HRKR001 / 4RAKR001 (4-pipe fan coil (alone or with radiator)) BACnet points list
Updated 4 November 2026
The KTRBUu217.456 is a flush-mounted 230 V room controller with display and BACnet MS/TP (B-AAC). Each built-in application loads its own object set; this entry is application 4HRKR001 / 4RAKR001, fan coil, 4-pipe. The BMS sets the operation mode, heating/cooling mode and setpoints, writes window, presence and fire-alarm states, and must keep a heartbeat going to stay in online mode.
This page lists 38 BACnet objects for the ALRE KTRBUu217.456 BACnet room controller - application 4HRKR001 / 4RAKR001 (4-pipe fan coil (alone or with radiator)) — 25 of them writable — with each object’s type, instance number, name, engineering units and access. It is re-typed from ALRE’s own free documentation, linked below.
- Manufacturer
- ALRE
- Model
- KTRBUu217.456 BACnet room controller - application 4HRKR001 / 4RAKR001 (4-pipe fan coil (alone or with radiator))
- Equipment
- Room controller (fan coil)
- Equipment type
- VAV boxes & fan coils
- BACnet objects
- 38 (25 writable)
- Transport
- BACnet MS/TP
- Firmware
- Not stated
- Default device instance
- 78
- Also known as
- KTRBUu217.456, KTRBUu-217.456, ALRE BACnet Raumregler, 4HRKR001, 4RAKR001
Reference only, provided as-is: verify against ALRE’s current documentation and the live device before use. Not official ALRE information. Terms of use.
BMS integration notes: ALRE KTRBUu217.456 BACnet room controller - application 4HRKR001 / 4RAKR001 (4-pipe fan coil (alone or with radiator))
Set device instance, MAC address (1-127), baud rate, Max Master and Max Info Frames on the controller. From the BMS, write Operation Mode BMS and (where present) Control-Mode BMS, the setpoints, and the window/presence states, and keep rewriting Heartbeat Input so the controller stays online.
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 2 | Operation Mode BMS | Protection, economy, pre-comfort or comfort | Write |
| MV 4 | Control-Mode BMS | Heating, cooling or automatic | Write |
| AV 15 | Setpoint COMFORT Heating | Comfort heating setpoint | Write |
| AV 25 | Setpoint COMFORT Cooling | Comfort cooling setpoint | Write |
| BV 2 | Window State | Window open from the BMS, 1 = open | Write |
| AV 30 | Heartbeat Input | Rewrite seconds before it counts down to 0 | Write |
| MV 3 | Active Operation Mode | Operation mode in force | Read |
| AI 1 | Temperature | Room temperature | Read |
| AV 1 | Active Setpoint | Setpoint in use | Read |
Enable & remote start
Operation Mode BMS (MV 2) selects protection, economy, pre-comfort or comfort; the schedule object can also drive it. Fire Alarm (BV 6) puts the controller into its fire-alarm state.
Heartbeat & communication loss
Heartbeat Input (AV 30): the BMS writes a number of seconds and the controller counts it down once per second. At 0 the controller goes to offline mode (local operation only); the BMS must write a new value before it reaches 0.
Sensors & values from the BMS
Window State (BV 2) and Presence Detector (BV 3) are written by the BMS from its own window contacts and presence sensors; the controller reads window open from BV 2.
Network setup
- Device instance 0-4194302, MS/TP MAC 1-127, baud rate, Max Master and Max Info Frames are set in the controller's BACnet menu.
- Local Config PIN (AV 4) protects the local configuration menu; Maximum Local Offset (AV 5) limits the user's setpoint shift.
- Factory settings: device instance 78, baud 115200, MS/TP address 128, which keeps the port off until a 1-127 address is set.
Watch out for
- Without a regular heartbeat write the controller drops to offline mode.
- The controller rewrites many objects itself; command them at a higher priority or the change looks ignored.
ALRE KTRBUu217.456 BACnet room controller - application 4HRKR001 / 4RAKR001 (4-pipe fan coil (alone or with radiator)) 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 | |||||
|---|---|---|---|---|---|---|
| AImin | 1 | Temperature | Room temperature used for control | °C | Read | |
| AI | 2 | Fan-Air Temperature | Fan discharge air temperature (external sensor) | °C | Read | |
| AO | 1 | Fan Control | Fan speed signal | % | Command | |
| AO | 11 | Control Value Heating | Heating valve signal | % | Command | |
| AO | 21 | Control Value Cooling | Cooling valve signal | % | Command | |
| AVmin | 1 | Active Setpoint | Setpoint currently in use | °C | Read | |
| AV | 2 | Air Temperature Max-Offset | Fan is reduced when room minus air temperature exceeds this | °C | Write | |
| AV | 4 | Local Config PIN | PIN for the local configuration menu | Write | ||
| AV | 5 | Maximum Local Offset | Maximum setpoint shift allowed at the unit | Write | ||
| AV | 12 | Setpoint PROTECTION Heating | Setpoint PROTECTION Heating | °C | Write | |
| AV | 13 | Setpoint ECONOMY Heating | Setpoint ECONOMY Heating | °C | Write | |
| AV | 14 | Setpoint PRE COMFORT Heating | Setpoint PRE COMFORT Heating | °C | Write | |
| AVmin | 15 | Setpoint COMFORT Heating | Setpoint COMFORT Heating | °C | Write | |
| AV | 22 | Setpoint PROTECTION Cooling | Setpoint PROTECTION Cooling | °C | Write | |
| AV | 23 | Setpoint ECONOMY Cooling | Setpoint ECONOMY Cooling | °C | Write | |
| AV | 24 | Setpoint PRE COMFORT Cooling | Setpoint PRE COMFORT Cooling | °C | Write | |
| AVmin | 25 | Setpoint COMFORT Cooling | Setpoint COMFORT Cooling | °C | Write | |
| AVmin | 30 | Heartbeat Input | BMS heartbeat: seconds until offline mode | Write | ||
| BO | 1 | Output Heating | Heating relay output | Command | 0=off, 1=on | |
| BO | 2 | Output Cooling | Cooling relay output | Command | 0=off, 1=on | |
| BVmin | 2 | Window State | Window open/closed, written by the BMS | Write | 0=closed, 1=open | |
| BV | 3 | Presence Detector | Presence, written by the BMS | Write | 0=Person Absence, 1=Person Presence | |
| BV | 4 | User Reset | Reset the user's local settings | Write | 0=done, 1=Reset | |
| BV | 5 | User Control Lock | Lock all local controls | Write | 0=Usercontrol unlocked, 1=Usercontrol locked | |
| BV | 6 | Fire Alarm | Fire alarm from the BMS | Write | 0=Fire alarm not active, 1=Fire alarm active | |
| MVmin | 2 | Operation Mode BMS | Operation mode requested by the BMS | Write | 1=PROTECTION, 2=ECONOMY, 3=PRE COMFORT, 4=COMFORT | |
| MVmin | 3 | Active Operation Mode | Operation mode currently active | Read | 1=PROTECTION, 2=ECONOMY, 3=PRE COMFORT, 4=COMFORT, 5=EXTENDED PRESENCE, 6=VALVE PROTECTION, 7=BOOST MODE, 8=SLEEP MODE, 9=EMERGENCY-OPERATION, 10=FIRE ALARM | |
| MVmin | 4 | Control-Mode BMS | Heating/cooling mode requested by the BMS | Write | 1=Heating, 2=Cooling, 3=Automatic | |
| MV | 5 | Active Control-Mode | Heating/cooling mode currently active | Read | 1=Heating, 2=Cooling | |
| LO | 10 | Regulator Heating | Heating PID loop | Read | ||
| LO | 20 | Regulator Cooling | Cooling PID loop | Read | ||
| SCH | 1 | Operation-Mode-Schedule | Weekly schedule of operation modes | Write | ||
| NC | 10 | Notificationclass for Alarms | Notification class for alarms | Read | ||
| NC | 20 | Notificationclass for Faults | Notification class for faults | Read | ||
| NC | 30 | Notificationclass for Operational Messages | Notification class for operational messages | Read | ||
| FILE | 100 | checksum.sez | Configuration file | Read | ||
| FILE | 101 | customer.lua | Configuration file | Read | ||
| Other | 1 | PRG0000001_BOOT | Program object | Read |
No points match these filters.
Object ID lookup: ALRE KTRBUu217.456 4HRKR001 / 4RAKR001 point IDs by name
AI1TemperatureAI2Fan-Air TemperatureAO1Fan ControlAO11Control Value HeatingAO21Control Value CoolingAV1Active SetpointAV2Air Temperature Max-OffsetAV4Local Config PINAV5Maximum Local OffsetAV12Setpoint PROTECTION HeatingAV13Setpoint ECONOMY HeatingAV14Setpoint PRE COMFORT HeatingAV15Setpoint COMFORT HeatingAV22Setpoint PROTECTION CoolingAV23Setpoint ECONOMY CoolingAV24Setpoint PRE COMFORT CoolingAV25Setpoint COMFORT CoolingAV30Heartbeat InputBO1Output HeatingBO2Output CoolingBV2Window StateBV3Presence DetectorBV4User ResetBV5User Control LockBV6Fire AlarmMV2Operation Mode BMSMV3Active Operation ModeMV4Control-Mode BMSMV5Active Control-ModeLO10Regulator HeatingLO20Regulator CoolingSCH1Operation-Mode-ScheduleNC10Notificationclass for AlarmsNC20Notificationclass for FaultsNC30Notificationclass for Operational MessagesFILE100checksum.sezFILE101customer.lua
Integration notes
- Object list from ALRE's published EDE file for application 4HRKR001 (identical object list in 4RAKR001); the device object is left out. Application meanings from section 12.3 of the KTRBUu217.456 Handbuch (German).
- The EDE file has no access column; access here is inferred. The controller writes many of its own objects cyclically, so the BMS must write at a higher priority (Handbuch, troubleshooting).
- Multistate state numbers are taken from the order of the EDE state texts (1 = first text).
- Instance numbers follow a pattern: heating objects x1x, cooling objects x2x (setpoints AV 12-15 / 22-25, outputs AO 11 / 21, loops 10 / 20).
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 KTRBUu217.456 BACnet room controller - application 4HRKR001 / 4RAKR001 (4-pipe fan coil (alone or with radiator)) 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 ALRE KTRBUu217.456 BACnet room controller - application 4HRKR001 / 4RAKR001 (4-pipe fan coil (alone or with radiator))
How many BACnet points does the ALRE KTRBUu217.456 BACnet room controller - application 4HRKR001 / 4RAKR001 (4-pipe fan coil (alone or with radiator)) have?
This list has 38 BACnet objects: 2 analog inputs, 3 analog outputs, 13 analog values, 2 binary outputs, 5 binary values, 2 files, 2 loops, 3 notification classs, 1 schedule, 4 multi-state values, 1 other. The exact set on a given unit depends on its firmware, installed options and configuration.
Which ALRE KTRBUu217.456 BACnet room controller - application 4HRKR001 / 4RAKR001 (4-pipe fan coil (alone or with radiator)) BACnet points are writable?
25 of the 38 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 ALRE KTRBUu217.456 BACnet room controller - application 4HRKR001 / 4RAKR001 (4-pipe fan coil (alone or with radiator)) BACnet documentation?
The source is EDE data KTRBUu (file 4HRKR001-EDE.csv), revision EDE timestamp 2019-10-21, published free by ALRE at https://alre.de/wp-content/uploads/2026/11/EDE_Daten_KTRBUu.zip.
What are the minimum BACnet points to integrate the ALRE KTRBUu217.456 BACnet room controller - application 4HRKR001 / 4RAKR001 (4-pipe fan coil (alone or with radiator))?
Start with MV 2 Operation Mode BMS (Protection, economy, pre-comfort or comfort); MV 4 Control-Mode BMS (Heating, cooling or automatic); AV 15 Setpoint COMFORT Heating (Comfort heating setpoint); AV 25 Setpoint COMFORT Cooling (Comfort cooling setpoint); BV 2 Window State (Window open from the BMS, 1 = open); AV 30 Heartbeat Input (Rewrite seconds before it counts down to 0); MV 3 Active Operation Mode (Operation mode in force); AI 1 Temperature (Room temperature); AV 1 Active Setpoint (Setpoint in use).
How do I enable BMS control of the ALRE KTRBUu217.456 BACnet room controller - application 4HRKR001 / 4RAKR001 (4-pipe fan coil (alone or with radiator))?
Operation Mode BMS (MV 2) selects protection, economy, pre-comfort or comfort; the schedule object can also drive it. Fire Alarm (BV 6) puts the controller into its fire-alarm state.
Does the ALRE KTRBUu217.456 BACnet room controller - application 4HRKR001 / 4RAKR001 (4-pipe fan coil (alone or with radiator)) need a BACnet heartbeat or have a communication timeout?
Heartbeat Input (AV 30): the BMS writes a number of seconds and the controller counts it down once per second. At 0 the controller goes to offline mode (local operation only); the BMS must write a new value before it reaches 0.
Can the BMS supply sensor values to the ALRE KTRBUu217.456 BACnet room controller - application 4HRKR001 / 4RAKR001 (4-pipe fan coil (alone or with radiator))?
Window State (BV 2) and Presence Detector (BV 3) are written by the BMS from its own window contacts and presence sensors; the controller reads window open from BV 2.
How do I check these points on the real KTRBUu217.456 BACnet room controller - application 4HRKR001 / 4RAKR001 (4-pipe fan coil (alone or with radiator))?
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 ALRE BACnet points lists
- Room controller (underfloor heating)
ALRE KTRBUu217.456 BACnet room controller - application 2FB001 / 2FB002 (2-pipe underfloor heating (minimum or maximum floor temperature))
ALRE KTRBUu217.456 flush-mounted BACnet MS/TP room controller set to application 2FB001 / 2FB002: 2-pipe underfloor heating (minimum or maximum floor temperature).
Also known as: KTRBUu217.456, KTRBUu-217.456, ALRE BACnet Raumregler, 2FB001, 2FB002 - Room controller (fan coil)
ALRE KTRBUu217.456 BACnet room controller - application 2HRKR001 (2-pipe fan coil with supply air temperature limit)
ALRE KTRBUu217.456 flush-mounted BACnet MS/TP room controller set to application 2HRKR001: 2-pipe fan coil with supply air temperature limit.
Also known as: KTRBUu217.456, KTRBUu-217.456, ALRE BACnet Raumregler, 2HRKR001 - Room controller (chilled ceiling)
ALRE KTRBUu217.456 BACnet room controller - application 2KD001 (2-pipe heating/cooling ceiling with dew point monitor)
ALRE KTRBUu217.456 flush-mounted BACnet MS/TP room controller set to application 2KD001: 2-pipe heating/cooling ceiling with dew point monitor.
Also known as: KTRBUu217.456, KTRBUu-217.456, ALRE BACnet Raumregler, 2KD001 - Room controller (radiator)
ALRE KTRBUu217.456 BACnet room controller - application 2RA001 (2-pipe radiator)
ALRE KTRBUu217.456 flush-mounted BACnet MS/TP room controller set to application 2RA001: 2-pipe radiator.
Also known as: KTRBUu217.456, KTRBUu-217.456, ALRE BACnet Raumregler, 2RA001 - Room controller (fan coil)
ALRE KTRBUu217.456 BACnet room controller - application 2UK001 (2-pipe fan convector / trench convector)
ALRE KTRBUu217.456 flush-mounted BACnet MS/TP room controller set to application 2UK001: 2-pipe fan convector / trench convector.
Also known as: KTRBUu217.456, KTRBUu-217.456, ALRE BACnet Raumregler, 2UK001 - Room controller (underfloor heating)
ALRE KTRBUu217.456 BACnet room controller - application 4FB001 (4-pipe underfloor heating/cooling)
ALRE KTRBUu217.456 flush-mounted BACnet MS/TP room controller set to application 4FB001: 4-pipe underfloor heating/cooling.
Also known as: KTRBUu217.456, KTRBUu-217.456, ALRE BACnet Raumregler, 4FB001 - Room controller (chilled ceiling)
ALRE KTRBUu217.456 BACnet room controller - application 4KD001 (4-pipe heating/cooling ceiling with 6-way ball valve)
ALRE KTRBUu217.456 flush-mounted BACnet MS/TP room controller set to application 4KD001: 4-pipe heating/cooling ceiling with 6-way ball valve.
Also known as: KTRBUu217.456, KTRBUu-217.456, ALRE BACnet Raumregler, 4KD001 - Room controller (chilled ceiling)
ALRE KTRBUu217.456 BACnet room controller - application 4KD002 / 4UK001 (4-pipe heating/cooling ceiling with air-quality damper output, or 4-pipe fan/trench convector)
ALRE KTRBUu217.456 flush-mounted BACnet MS/TP room controller set to application 4KD002 / 4UK001: 4-pipe heating/cooling ceiling with air-quality damper output, or 4-pipe fan/trench convector.
Also known as: KTRBUu217.456, KTRBUu-217.456, ALRE BACnet Raumregler, 4KD002, 4UK001 - Room controller (chilled ceiling)
ALRE KTRBUu217.456 BACnet room controller - application 4KD003 / 4RAKD001 (4-pipe heating/cooling ceiling (alone or with radiator))
ALRE KTRBUu217.456 flush-mounted BACnet MS/TP room controller set to application 4KD003 / 4RAKD001: 4-pipe heating/cooling ceiling (alone or with radiator).
Also known as: KTRBUu217.456, KTRBUu-217.456, ALRE BACnet Raumregler, 4KD003, 4RAKD001
Source: EDE data KTRBUu (file 4HRKR001-EDE.csv) · rev. EDE timestamp 2019-10-21. Object names, instances and units are reproduced as published; descriptions are our own.