Thermokon JOY HC AO2DO | HC 3AO | RS485 BACnet

Datasheet

Subject to technical alteration

Issue date: 13.06.2025

Valid from production date

Please note the production date on the product label on the device.

CE Mark

BACnet™ Certified

Application

JOY HC AO2DO RS485 BACnet (85..260 V~)

Room thermostat with an appealing design for heating/cooling (230 V) and controlling a 6-way valve. Used for individual control of temperature in commercial and residential buildings. Features a modern design with a 2.5" touch surface for intuitive operation. Configurable with 3 time channels, each with 4 time periods. Suitable for flush mount boxes.

JOY HC 3AO RS485 BACnet (24 V ~/=)

Modern design, flush mounting room thermostat for individual temperature control in commercial, industrial, and residential buildings. Tailored for two-pipe and four-pipe units with two-wire electric valves and controlling a 6-way valve. Combines a modern design with a 2.5" LCD and a touch-sensitive surface. Offers 3 time program options, each with 4 time periods.

Security Advice – Caution

Caution! The installation and assembly of electrical equipment should only be performed by authorized personnel. The product must only be used for its intended application. Unauthorized modifications are prohibited! Ensure all power is disconnected before installing. Do not connect to live/operating equipment.

Caution! Risk of electric shock due to live components within the enclosure, especially devices with mains voltage supply (usually between 90..265 V).

Please comply with:

• Local laws, health & safety regulations, technical standards and regulations
• Condition of the device at the time of installation to ensure safe installation
• This data sheet and installation manual

Product Testing and Certification

Declaration of Conformity

The declaration of conformity for the products is available on the website: https://www.thermokon.de/direct/en-gb/categories/joy-hc

Notes on Disposal

The crossed-out wheelie bin symbol indicates that the product or removable batteries must not be disposed of with household or commercial waste. Within the EU, you are legally obliged to dispose of the product separately and appropriately in accordance with the national laws of your country. Alternatively, please contact your supplier or Thermokon Sensortechnik GmbH. Further information can be found at: www.thermokon.com

Mounting Advise Room Sensors

The accuracy of the room sensors is influenced by technical specifications, positioning, and installation type.

During Assembly:

• Seal mounting box (if present).
• Installation type, air draught, heat source, radiation heat, or direct sunlight can affect the measurement.
• Building material specific properties of the installation place (brick-, concrete-, partition wall, cavity wall, ...) can affect the measurement.

Assembly not recommended in:

• Air draught (e.g., close to windows / doors / fans ...)
• Near heating sources
• Direct sunlight
• Niches / between furniture / ...

Mounting Advices

Plasterboard boxes should be covered by wallpaper or paint to avoid the plasterboard box's front rim being partially visible underneath the JOY unit. Consider using white plasterboard boxes (e.g., Kaiser 9063-77).

Application Notice

Software

Software description available at: https://www.thermokon.de/

MicroSD Card

• Data storage device for Update, Upgrade, or configuration.
• FAT filesystem required. NTFS and exFAT filesystems are not supported.

Bootloader

A MicroSD-card Bootloader for loading applications (Update, Upgrade) or configurations is integrated in the device. Active bootloader indicated by blinking ring illumination (1 sec. cycle), display not triggered.

Firmware Update

1. Remove upper part.
2. Insert a microSD-card with a valid Update file.
3. Mount upper part.

The valid update file is recognized, and the update process starts (ring illumination blinks in a 300ms cycle). New application starts automatically after update (approx. 20-30 sec.). Remove upper part to remove the microSD-card.

Device Configuration

1. Remove upper part.
2. Insert a microSD-card with the device configuration file.
3. Mount upper part.

Configuration file is recognized, and the device is configured. Device is ready for operation. Remove upper part to remove the microSD-card.

Parameters for display, setpoint, and controller can only be changed via the configuration software.

Notes on the Update Function

An update of the device software is only possible within the same version main numbers.

Supported Versions: 3.0.2 - 3.0.11, 2.6.6 - 2.3.0, 2.x, 3.x, 2.x, 4.x

Configuration via uConfig | MicroSD-Card or Modbus

Configuration Software

uConfig for Windows 10 is required to use the uConfig configuration software.

The JOY room thermostat can be parameterized using the uConfig configuration software. An SD card is used to transfer the created configuration file to the device. For BUS devices, live configuration can also be performed via the BUS interface.

The installer for the configuration software is available in the Download-Section on the Thermokon website. The installer retrieves all necessary files and plug-ins from the web server. This version includes an integrated update function.

Download Section

Technical Data

JOY HC AO2DO | HC 3AO

*Humidity and CO2 measured values are not processed internally. The values are displayed and can be read out by higher-level systems for evaluation and further use.

JOY HC AO2DO

JOY HC 3AO

*Power supply: When several BUS devices are supplied by one 24 V AC voltage supply, ensure that all "positive" operating voltage input terminals (+) of the field devices are connected together and all "negative" operating voltage input terminals (-) (=reference potential) are connected together (in-phase connection of field devices). In case of reversed polarity at one field device, a supply voltage short-circuit would be caused by that device. The consequential short-circuit current flowing through this field may cause damage to it. Therefore, pay attention to correct wiring.

Function Description - Controller

JOY HC AO2DO (85..260 V ~)

PI controller (PWM) & 2-point/3-point controller (configurable)

The manipulated variable is output as a proportional control signal to the 6-way valve. Valve type is set via configuration software (e.g., 2..10 V, 0..10 V). A freely parameterizable 6-way valve (generic 6WV) is also possible.

Heating/Cooling with 2-point-/ 3-point-controller (only HC AO2DO)

The 2-point controller has heating ON/OFF states. The 3-point controller also includes cooling states. Both use hysteresis.

[Diagram showing heating/cooling control with hysteresis]

Heating/Cooling with PI-controller (PWM) (only HC AO2DO)

The PI control loop's time response depends on proportional (xp) and reset time (tn) parameters. The P portion changes position value proportionally to the error variable, while the integral portion takes effect after a time. The resulting variable is output as a pulse-width-modulated signal.

Heating/Cooling with PI-controller (0..10 V) (only HC 3AO)

Similar to the PWM PI controller, the time response depends on xp and tn. The P portion changes position value proportionally to the error variable, while the integral portion takes effect after a time. The resulting variable is output as an analog 0..10 V signal.

CO2 + Humidity Measuring Value

CO2 sensor measures 0-2000 ppm (1 ppm resolution). Value can be adjusted for calibration or auto self-calibration. Humidity sensor measures 0-100% (0.1% resolution). Value can be adjusted for calibration. Humidity and CO2 values can be read via bus or displayed, but are not processed internally.

Display

Value Screen

• Internal sensor values
• External sensor values (configurable)
• Additional humidity/CO2 value (optionally configurable)

Header (value/symbol display)

Displays time, weekday, date, ECO symbol (mode dependent), and alarm symbol (higher priority than ECO symbol).

Footer (symbol display)

Shows symbols for heating/cooling mode, occupancy, window contact, etc. The "Timechannel active" symbol appears when a time channel is active.

[Icons for Occupancy, Heating, Cooling, Time-channel active, Window contact/dew point]

Function Description – Buttons

Touch surface allows adjustment for setpoint and fan speed regulation. White ring-LED of the Power button provides visual feedback.

• Setpoint change: Adjusts setpoint within a configurable range (e.g., ±3 °C).
• Power button: For Standby mode or Presence key (requires a 3s press for presence key function).

After 3 seconds of inactivity, the display returns to the main screen.

Standby Mode

In standby mode, the display and all outputs are switched off (controller deactivated). Frost and heat protection monitoring remain active.

Navigation Parameter Menu

Use up, down, left, right buttons to navigate. Right button opens submenu. Left button in header exits submenu. Confirmation via Enter key.

[Diagram showing navigation buttons]

Diagnostics Menu

Access the diagnostics menu by selecting the header in the parameter menu startscreen and pressing the ENTER key. Provides information on device type, software version, input/output states, and controller state.

Parameter Menu - BACnet Interface

Activate configuration menu by simultaneously pressing "up" (A) and "down" (C) buttons for at least 5 seconds.

The menu is enabled for the first 60 minutes after power-on, provided the device is not actively involved in BACnet communication. Access is blocked after 60 minutes if no valid communication occurs or if a valid request is received from a DDC.

BACnet Settings

• Address: Default 32, adjustable (1-247).
• Baudrate: Default 19200, options: 9600, 19200, 38400, 57600, 76800, 115200 Bd.

[Diagram showing BACnet settings]

Configuration

Parameter Menu

Access the parameter menu by pressing buttons simultaneously for 3 seconds.

[Diagram showing parameter menu access]

If no entry is made for 8 minutes, the parameter menu exits automatically.

Menu → Time Channels

Up to 3 time channels with 4 time periods each can be parameterized. Channel 3 has the highest priority.

Time Channel

Time period within one week configuration via button left/right. 4 periods.

Periods:

• Start: Configuration start setpoint (24h format).
• Fan: Selection fan stage (depends on type).
• Temperature: Setpoint (°C or °F, depends on configuration).
• ECO mode: In ECO mode, the dead zone between heating and cooling is automatically set to the ECO dead zone configured in "General Settings" (default: 10 K).

Menu → Time/Date

In the Time/Date menu, the time, date, and display format can be configured.

The room thermostat is equipped with a real-time clock (needs to be set during commissioning).

Menu → Sensor Settings

Value display of internal and external temperature sensors.

Calibration CO2 Sensor (Forced)

The key combination (top left + top right) calibrates the detected air mixture with the configured display value. This works only in the CO2 sensor settings menu. Attention: CO2 sources (e.g., breathing air) influence the measured value recording!

The ASC function is deactivated during forced calibration.

ASC (Automatic Selfcalibration)

The ASC function sets the lowest recorded CO2 value (7-day period) as the reference value for measured value recording. A sufficient supply of fresh air within the 7-day period is necessary for correct measurement results.

CO2 Factory Setting

Use the key combination to reset the sensor to factory settings. This works only in the CO2 sensor settings menu.

Menu → Common Settings

Common Device Settings:

• Brightness: Configuration of LCD brightness/LED ring brightness during button operation/usage.
• Contrast: Configuration of display contrast values.
• Valve protection: A valve protection function regularly actuates heating and cooling valves to prevent locking during non-usage times. The function executes on Fridays at 5:00 (heating valve) and 5:20 (cooling valve). The corresponding valve is triggered for 5 minutes if not activated during the last 96 hours.
• ECO deadband: The dead band can be adjusted (default 10.0 K).
• Fan stages (type-depending): Configuration of the device fan stages.
• Language: Selection of display language.
• Factory setting (reset): Selecting "Factory setting" resets the room thermostat and restores factory default settings.

Inputs

Up to 2 inputs are configurable for functions such as windows contact, dew point, occupancy, change-over, or external sensor option. Combinations can be found in the software specification of the JOY.

• Sensor (NTC10K): The value of an external sensor is shown if connected and configured. The room thermostat controls according to the external sensor. An external temperature sensor can protect floor heating; if a configured temperature is exceeded, heating is suspended.
• Change-Over DI: Digital input switches between heating and cooling mode. Depending on contact state, only heating or cooling controller is active (default: contact open = Heating active, contact closed = Cooling active). Terminals 4 and 5 are used in parallel for heating or cooling.
• Change-Over Sensor: Used to automatically switch between heating and cooling mode. Limit temperatures for heating and cooling can be configured. If the digital input is configured as a changeover, the room thermostat operates in 2-pipe mode, and outputs (terminals 4 and 5 [3AO: terminals 3 and 4]) are used in parallel for heating or cooling. If the universal input is configured as a changeover sensor, medium temperature measurement can be controlled via parameters. Up to two measurements per day are possible, configuring opening time of valves and duration of medium temperature measurement. During active opening time and after faulty medium measurement, the controller mode display alternates between heating and cooling symbols if activated.
• Window contact/Energy hold off: If a window contact is enabled via the digital input, the reference switches to a setback setpoint (Heat SP/Cool SP).
• Dewpoint: An active dewpoint contact locks the cooling controller.
• Occupancy: If occupancy function is active, the symbol is displayed. In "unoccupied" state, heating setpoint is reduced by 2K (default) or cooling setpoint raised by 2K.
• Keycard-Switch: When the card is not inserted, the device enters sleep mode. Keys are locked, display is switched off, and the controller adjusts to nominal values of the "unoccupied" state.
• Alarm contact: An alarm symbol can be shown in the header. Backlight flashes when alarm is active. This symbol has higher priority than the ECO symbol and overwrites it.

Connection Plan

JOY HC AO2DO (85..260 V~)

[Wiring diagram for JOY HC AO2DO]

Terminal Connections:

• 1 GND (6-way valve)
• 2 0..10 V (6-way valve)
• 4 Cooling
• 5 Heating
• 6 Digital Input 2 (230V)
• 7 L
• 8 N
• 9 Digital Input 1 (or NTC10K)
• 10 GND DI 1
• 11 A
• 12 B

JOY HC 3AO (24 V ~/=)

[Wiring diagram for JOY HC 3AO]

Terminal Connections:

• 1 Digital Input 2
• 2 6-way valve (0..10 V)
• 3 Cooling (0..10 V)
• 4 Heating (0..10 V)
• 5 GND DI2
• 6 GND
• 7 24 V = (±10%) or 24 V ~ (±10%)
• 8 GND
• 9 Digital Input 1 (or NTC10K)
• 10 GND DI 1
• 11 A
• 12 B

Note: Floating contacts must not be connected in parallel. For switching multiple devices with one contact, use the input for floating contacts. Ensure the same phase is used for jointly switched devices.

Dimensions (MM)

[Diagram showing dimensions of the JOY HC unit]

Accessories (Optional)

• Frame for surface mounting JOY pure white (Item No. 760201)
• Frame for surface mounting JOY black (Item No. 760951)
• Decorative frame pure white for JOY (Item No. 681452)
• Decorative frame black for JOY (Item No. 740951)
• MicroSD card 2GB (Item No. 500098)
• RS485 Biasing Adapter (Item No. 811378)
• USB-Interface RS485 (incl. Treiber CD) (Art.-Nr.: 668293)