BLAUBERG S21 Wireless Control System
User's Manual
Introduction
This user's manual is intended for technical, maintenance, and operating staff. It provides information on the purpose, operating principle, and design of the BLAUBERG S21 unit and its modifications. It is essential that technical and maintenance personnel possess theoretical and practical training in ventilation systems and adhere to workplace safety rules, construction norms, and applicable standards.
The information presented herein was accurate at the time of publication. BLAUBERG reserves the right to modify product technical characteristics to incorporate the latest technological developments. No part of this publication may be reproduced, stored, or transmitted in any form without prior written permission from the company.
Controller Wiring Diagram
The document includes a detailed controller wiring diagram illustrating the electrical connections for power supply, sensors, fan motors, and communication interfaces (RS-485, Wi-Fi). It highlights connections for various inputs and outputs, including temperature sensors (T1-T5), VOC, CO2, PM2.5 sensors, fan speed control (M1, M2), filter status, and various control signals.
Controller Specifications
Power Supply: 100-250 V, 50/60 Hz, maximum power consumption 30 W.
Controller Inputs
| Input Purpose | Input Type | Signal Type | Designation | Operation Logic | Comments |
|---|---|---|---|---|---|
| Outdoor air temperature | Analogue | NTC 10 kOhm | T1 | -40...120 °C | |
| Supply air temperature or temperature downstream of the main air heater | Analogue | NTC 10 kOhm | T2 | -40...120 °C | |
| Extract air temperature | Analogue | NTC 10 kOhm | T3 | -40...120 °C | |
| Exhaust air temperature | Analogue | NTC 10 kOhm | T4 | -40...120 °C | |
| Return heat medium temperature | Analogue | NTC 10 kOhm | T5 | -40...120 °C | |
| External set point adjuster | Analogue | 0-10V | 10 V IN | Enables fan speed control via potentiometer. Energised with 10 V. | |
| Main humidity sensor | Analogue | 0-10V | RH | Sensors are enabled/disabled via Engineering Menu. Energised with 24 V for external sensors. Overload protection for 24V line at >700 mA. Manual reset required after overload. | |
| Main VOC sensor | Analogue | 0-10V | VOC | ||
| Main CO2 sensor | Analogue | 0-10V | CO2 | ||
| Main PM2.5 sensor | Analogue | 0-10V | PM2.5 | ||
| Supply fan control | Discrete | Open collector/dry contact | M1 (TACHO) NC | Configurable for fan tach pulses or external dry contact. Allows programming tach pulses per fan revolution and alarm detection time. | |
| Extract fan control | Discrete | Open collector/dry contact | M2 (TACHO) NC | ||
| Supply filter contamination control | Discrete | Dry contact | FILTER (IN SU) NO | ||
| Extract filter contamination control | Discrete | Dry contact | FILTER (IN EXH) NO | ||
| Heat medium flow control | Discrete | Dry contact | L1 | NC | Enabled/disabled via Engineering Menu. |
| Heat medium pressure control | Discrete | ~220 V | L2 | NC | Enabled/disabled via Engineering Menu. |
| Fire alarm sensor | Discrete | ~220 V | L3 | NC | Enabled/disabled via Engineering Menu. |
| Boost switch | Discrete | ~220 V | L4 | NO | Enabled/disabled via Engineering Menu. |
| Fireplace switch | Discrete | ~220 V | L5 | NO | Enabled/disabled via Engineering Menu. |
| Electric preheating thermostat (alarm) | Discrete | ~220 V | NKP TRIAC (IN) | NC | |
| Electric reheater thermostat (alarm) or water heater capillary thermostat (alarm) | Discrete | ~220 V | NKD TRIAC (IN) | NC |
Controller Outputs
| Output Purpose | Output Type | Signal Type | Designation | Note |
|---|---|---|---|---|
| Supply fan control | Analogue | 0-10 V | M1 (OUT 0-10) | Configurable minimum/maximum signal values and delay for automatic control. |
| Extract fan control | Analogue | 0-10 V | M2 (OUT 0-10) | |
| Analogue control of the reheater or water heater valve control | Analogue | 0-10 V | 0-10V OUT (1) | Operation depends on heater type: Electric (controls external circuit board) or Water (2-10 V valve control). |
| Analogue control of the bypass | Analogue | 0-10 V | 0-10V OUT (2) | |
| Analogue control of the cooler | Analogue | 0-10 V | 0-10V OUT (3) | Operation depends on cooler type: Discrete (output inactive) or Analogue (controls built-in/external cooler circuit). |
| Electric preheater control | External TRIAC control | NKP TRIAC (OUT) | PWM signal modulated to external TRIAC (10 sec cycle). | |
| Electric reheater control | External TRIAC control | NKP TRIAC (OUT) | PWM signal modulated to external TRIAC (10 sec cycle). | |
| Electric preheater release | Relay | 3A, ≤30 V/~250 V | NKP | |
| Electric heater release or water heater pump release | Relay | 3A, ≤30 V/~250 V | NKD | |
| Supply damper actuator control and/or supply fan frequency converter release | Relay | 3A, ≤30 V/~250 V | VALVE1 | |
| Exhaust damper actuator control and/or extract fan frequency converter release | Relay | 3A, ≤30 V/~250 V | VALVE2 | |
| Discrete control of the cooler | Relay | 3A, ≤30 V/~250 V | KKB | Controls cooler directly. Configurable minimum activation period and idle time. |
| Discrete control of the bypass or analogue control of the rotary heat exchanger | Two relay outputs | 3A, ≤30 V/~250 V | BPS | Operation depends on unit configuration. Discrete bypass: controls C-NO/C-NC relays. Rotary heat exchanger: controls actuator directly or via release. BPS relay (C-NO) is enabled. |
Communication Interfaces
RS-485: Supports up to 16 units (slave devices) and 16 control panels (master devices). The terminal is energised with 24 DCV, supporting up to 16 external devices with a maximum current of 500 mA. Exceeding this triggers overload protection.
Wi-Fi: The unit can be fitted with a 50 ohm remote antenna.
Connecting a Mobile Device
The BLAUBERG AHU application controls the fan. It is available via App Store, Play Market, or QR code.
Wi-Fi Technical Data:
- Standard: IEEE 802.11 b/g/n
- Frequency band: 2.4 GHz
- Transmission power: 100 mW (dBm)
- Network: DHCP
- WLAN safety: WPA, WPA2
When the application starts, a "No communication with the device!" warning may appear if the device is not connected.
Connection Procedure:
- The unit operates as a Wi-Fi access point by default. Connect your mobile device to the unit's Wi-Fi access point (SSID: FAN + 16-character ID).
- The default Wi-Fi access point password is
11111111. - Start the BLAUBERG AHU application.
- Navigate to Menu ▶ Connection ▶ At Home.
- Select Default connection if connecting directly without a router, or perform a network search if connecting via a router.
- Select the connection with the necessary ID.
- Edit connection settings if needed.
- Change the connection name and create a new password (0-9, a-z, A-Z). The default unit password is
1111. - Confirm settings.
Unit Password Change
To change the unit password:
- Go to Menu ▶ Connection ▶ At Home.
- Select the connection and press the ▶ button.
- Enter and confirm the new password (valid characters: 0-9, a-z, A-Z).
- Press Change Password.
Wi-Fi Parameter Setup
To configure Wi-Fi parameters:
- Go to Menu ▶ Connection ▶ Wi-Fi setup.
- Press the Receive button to view current settings.
- Select Wi-Fi mode: Access point or Client.
Access Point Mode: Connects up to 8 devices without a router. Security options include Open, WPA PSK, WPA2 PSK, and WPA/WPA2 PSK.
Client Mode: Connects to a home router network. Requires entering router details (SSID, password) and selecting IP address type (DHCP or Static).
Special Setup Mode
Used to restore access if Wi-Fi or unit password is lost, or for other troubleshooting. Press and hold the Setup mode button for 5 seconds until its LED flashes. The mode lasts for 3 minutes before reverting to previous settings. To exit, press and hold the button again for 5 seconds.
Settings for Special Setup Mode:
- Wi-Fi name: Setup mode
- Wi-Fi password:
11111111(unit password ignored) - Ethernet IP address type: DHCP
- RS-485 address: 1
- RS-485 transmission rate: 115200 baud
- RS-485 stop bits: 2
- RS-485 parity: none
- Engineering menu password: 1111
Cloud Server Connection
Allows remote control of the unit via the Internet through a cloud server. This function is disabled by default.
Activation: Go to Menu ▶ Connection ▶ At home, select the unit, enter settings, and enable "Control through the cloud server".
Note: Loss of home router internet connection may temporarily disrupt unit communication.
Creating a Cloud Server Account
- Open the mobile app and navigate to MENU ▶ CONNECTION ▶ THROUGH CLOUD SERVER.
- Press the ▶ button to add a new account.
- Enter login, password, and email for recovery. Press ✔️.
- The app logs in automatically. Add a new connection by entering a unit name, ID number, and unit password (default:
1111). - Confirm data by pressing ✔️.
- To exit the account, press ◀.
Home Page
The Home Page displays the unit's status and sensor readings:
Indicators:
- Connection Status: Shows current unit connection (home network or cloud server).
- Operation Mode: Indicates the current mode (Ventilation, Heating, Cooling, Auto).
- Filter Replacement Indicator: Alerts when filter replacement is due.
- Alarm/Warning: Red indicates an alarm (serious error, unit shutdown), orange indicates a warning.
- Electric Heater Cooling: Shows preheating/reheating status.
- Boost Mode: Indicates Boost mode is active.
- Fireplace Mode: Indicates Fireplace mode is active.
Sensor Readings:
Displays current temperatures and air quality parameters (Humidity, CO₂, PM2.5, VOC). The color of the indicator shows sensor status: gray (not detected), blue (working normally), red (signal exceeds pre-set value).
Control Buttons:
- Unit On/Standby: Powers the unit on or off.
- Selection of pre-set speed: Allows choosing predefined fan speeds.
- Manual speed setup: Enables adjusting fan speed via a scroll bar.
- Timer activation: Accesses timer settings (via Menu ▶ Basic Settings ▶ Timers).
- Week-scheduled operation mode activation: Accesses schedule settings (via Menu ▶ Basic settings ▶ Schedule).
Basic Settings
Temperature
Navigate to Menu ▶ Basic settings ▶ Temperature.
- Temperature setpoint: Select display units (°C or °F) and set the desired temperature for normal mode.
- Operating mode: Choose between Ventilation (no temp control), Heating, Cooling, or Auto (automatic temperature management).
Temperature control is not available for units without heating, cooling, bypass, or rotary heat exchangers.
Air Quality
Navigate to Menu ▶ Basic settings ▶ Air quality.
This section allows setting thresholds for Humidity, CO₂, PM2.5, and VOC. If thresholds are exceeded, the fan speed increases. If sensors are inactive, a "Air quality management not available" message is displayed. Sensors can be enabled via the Engineering Menu.
Timers
Navigate to Menu ▶ Basic Settings ▶ Timers.
Configure timer settings for speed, temperature, Boost switch on/off delays.
Schedule
Navigate to Menu ▶ Basic settings ▶ Schedule.
Set up a weekly schedule with up to 4 time intervals per day for different operating parameters (speed, temperature). Adjustments can be made daily, for weekdays, weekends, or the entire week.
Date and Time
Navigate to Menu ▶ Basic settings ▶ Date and time.
View and adjust the current time (hh:mm:ss) and date (dd.mm.yyyy). Syncing with a mobile device is possible.
Filter
Navigate to Menu ▶ Basic settings ▶ Filter.
Set the filter timer (70-365 days) for maintenance alerts. Displays total unit operating time.
Connection Settings
RS-485 Setup
Navigate to Menu ▶ Connection ▶ RS-485 setup.
Configure RS-485 parameters: Address, Baud rate (default 115200), Stop bits (default 2), Parity (default none). Note: Incorrect RS-485 settings can affect external control and panel functionality.
Ethernet Setup
Navigate to Menu ▶ Connection ▶ Ethernet setup.
Configure Ethernet settings: IP address type (DHCP recommended, Static for manual entry), IP address, Subnet mask, and Default gateway. If no Ethernet adapter is detected, a message is displayed.
Engineering Menu
Access requires expert skills. Changes can cause unit malfunction. Default password: 1111.
Navigate to Menu ▶ Engineering menu to access various sub-menus.
Air Flow
Configure air flow values for Standby, Speed 1, 2, 3, Boost, and Fireplace modes. Standby air flow above 0% may disable temperature and air quality management.
Temperature
Select master sensors for temperature control (supply duct, extract duct, room). Configure minimum supply air temperature, winter/summer changeover, main heater type (electric/water), main heater control mode (manual/auto), and cooler type (discrete/analogue).
Cooler Control Mode
Options: Manual (on/off) or Auto. For analogue control, a 0-100% slider is available in manual mode. Settings for minimum time before OFF/ON and hysteresis are available.
Bypass/Rotary Heat Exchanger Control Mode
Configure control modes (close/run, open/stop, auto for discrete; manual/auto for analogue) and settings for bypass or rotary heat exchanger.
Freeze Protection
Details types of freeze protection for heat exchangers, activated when outdoor temperatures drop below -3°C. Includes protection by supply fan, bypass, and electric preheater.
Sensors
Lists available sensors (Main/External Humidity, VOC, CO₂, PM2.5) and their configuration. Includes settings for Boost switch, Fireplace switch, Fire alarm sensor, Water pressure/flow sensors, fan RPM, filter contamination control, and thermostats.
PID Controller
Adjust PID controller settings (Kp, Ki) to fine-tune control signal response for various functions like main heater, pre-heater, bypass, cooler, humidity, CO₂, PM2.5, and VOC.
Firmware
Displays current firmware version and date. Allows checking for and upgrading firmware via an internet connection.
Factory Settings
Resets all settings to factory defaults. May require re-entering network settings.
Engineering Password
Allows changing the engineering password.
Alarms
Displays active alarms (red) and warnings (black). Alarms indicate serious errors and shut down the unit; they require manual reset. Warnings indicate less critical issues and may reset automatically.
Alarm/Warning Codes
The following table lists various alarm and warning codes, their descriptions, and conditions for activation:
| Ordering No. | Description |
|---|---|
| 0. | Alarm! Supply fan malfunction. |
| 1. | Alarm! Extract fan malfunction. |
| 2. | Alarm! No outdoor air temperature sensor detected. |
| 3. | Alarm! Short circuit of the outdoor air temperature sensor. |
| 4. | Alarm! No supply air temperature sensor detected. |
| 5. | Alarm! Short circuit of the supply air temperature sensor. |
| 6. | Alarm! No extract air temperature sensor detected. |
| 7. | Alarm! Short circuit of the extract air temperature sensor. |
| 8. | Alarm! No exhaust air temperature sensor detected. |
| 9. | Alarm! Short circuit of the exhaust air temperature sensor. |
| 10. | Alarm! Actuation of the protecting preheater thermostat. |
| 11. | Alarm! Actuation of the protecting preheater thermostat. |
| 12. | Alarm! Preheating cannot provide heat exchanger freezing protection. |
| 13. | Warning! Main humidity sensor is not detected. |
| 14. | Warning! Main CO2 sensor is not detected. |
| 15. | Warning! Main PM2.5 sensor is not detected. |
| 16. | Warning! Main VOC sensor is not detected. |
| 17. | Warning! External humidity sensor is not detected. |
| 18. | Warning! External CO2 sensor is not detected. |
| 19. | Warning! External PM2.5 sensor is not detected. |
| 20. | Warning! External VOC sensor is not detected. |
| 21. | Warning! Indoor air temperature is not detected! |
| 22. | Warning! The threat of freezing heat exchanger. |
| 23. | Warning! The battery is low. |
| 24. | Warning! Replace the supply air filter. |
| 25. | Alarm! Fire alarm activation. |
| 26. | Alarm! Low supply air temperature. |
| 27. | Alarm! The return water temperature sensor is not detected. |
| 28. | Alarm! Short circuit of the return water temperature sensor. |
| 29. | Warning! Replace the extract air filter. |
| 30. | Alarm! No water pressure detected. |
| 31. | Alarm! No water flow detected. |
| 32. | Alarm! Low return water temperature. |
| 33. | Alarm! Supply fan cannot provide heat exchanger freezing protection. |
| 34. | Alarm! Bypass cannot provide heat exchanger freezing protection. |
| 35. | Warning! Freeze protection is deactivated this may cause freezing of the heat exchanger! |
| 36. | Warning! The main heater is operated in the manual mode. |
| 37. | Warning! The cooler is operated in the manual mode. |
| 38. | Warning! The bypass is operated in the manual mode. |
| 39. | Warning! The rotary heat exchanger is operated in manual mode. |
| 40. | Warning! The filter timer countdown is completed. Please, replace the filter. |
| 41. | Warning! Incorrect operation of the rotary heat exchanger. |
| 42. | Warning! The preheater is operated in the manual mode. |
Mode Priorities
The system prioritizes operating modes based on a defined hierarchy. If a higher priority mode is activated (e.g., Fireplace ON), its air flow settings are used. If not, the system checks the next priority mode (e.g., Timer ON, Standby ON, Boost ON, Schedule ON, 0-10V input, manual speed setting, or air quality threshold increase), applying the corresponding air flow control logic.
