eSTER_x40 is a battery-powered room thermostat designed for wireless cooperation with the external ISM_xSMART radio transmission module from PLUM. The thermostat is installed in a selected room where the desired temperature can be set. It uses bidirectional ISM radio communication, enabling information transmission from the main controller to the thermostat about fuel level in the tank, alarm states of the controller, and the value of the external temperature. The thermostat displays information on the backlit LCD screen, such as room temperature, selected operating mode, current time, and date, with automatic clock synchronization with the main controller.

Applications, Advantages, and Benefits:

• Room temperature setting and mode selection
• Dedicated backlit LCD display
• Wall-mounted installation in any room without cables
• Wireless, bidirectional ISM communication with the controller
• Portability within the signal range
• Stable ISM transmission range in residential buildings
• Boiler ON/OFF mode
• System operation monitoring
• Weekly schedules
• Notification for boiler cleaning
• Remote boiler temperature setting
• Domestic hot water (DHW) temperature adjustment
• Fuel level monitoring
• Alarm signaling
• Remote room temperature adjustment
• Automatic heating curve adjustment
• Room temperature correction
• Display of the current operating mode

Technical Specifications:

• Wireless, bidirectional ISM radio transmission at 868MHz (range 865-868MHz)
• Powered by standard replaceable batteries: 2xAA
• Built-in acoustic signaling buzzer
• Protection class: IP20
• Operating temperature range: 5-35ºC

Full ISM Bidirectional Radio Communication:

• Works with the ISM_xSMART bidirectional radio transmission module with the LBS system in the ISM band,
• Allows full configuration of the controller menu from any room,
• Maintains the desired room temperature,
• Retrieves data from the controller, providing information on fuel level in the tank, alarm states, burner operation, cleaning needs, and external temperature,
• Turns the boiler on and off and synchronizes time with the controller,

xSMART System:

• LBS system – minimizes interference with other devices,
• Adaptive control of the set temperature for heating circuits and boiler,
• Access to operating parameters and schedules from the user and service menus,
• Mode selection and full parameter configuration of the controller,
• Durable capacitive buttons,
• Battery-saving mode, low battery indicator, and radio signal strength display,
• Parental lock,
• Simple pairing with devices,
• High operational stability thanks to constant connection quality monitoring,