iSMA-B-LP-HC 2020-03-30T12:36:48+00:00



iSMA-B-LP-HC is a room unit with 2.3” LCD display and four function buttons. Additionally, the room unit has the built-in temperature sensor and the humidity and CO2 sensors.


iSMA-B-LP-HC is powered with 24 V AC/DC and has the built-in RS485 port (Modbus RTU/ASCII and BACnet MSTP). Use of open communication protocol allows to connect the room unit with any controller supporting Modbus RTU/ASCII or BACnet MSTP. Together with iSMA-B-FCU controller, the room unit allows to change the basic parameters such as: temperature setpoint, fan speed, FCU mode and others. Thanks to built-in USB port, there is possibility to firmware update and room unit configuration without the necessity of power supply. iSMA-B-LP has the modern design and is available in different colours (white is basic) on client request.

Temperature sensor

  • Type: 10k NTC
  • Range: 0 – 50°C
  • Accuracy: +/- 0,5°C
  • Resolution: +/- 0,1°C

Humidity sensor

  • Range: 0-100% RH
  • Accuracy: +/- 2% RH in range 20 – 80% RH
  • Resolution: +/- 1% RH

CO2 sensor

  • Method Non Dispersive Infrared (NDIR), gold plated optics, diffusion sampling (with Telaire’s Patented ABC Logic Self Calibrated Algorithm)
  • Range: 400 – 2000 ppm
  • Accuracy: +/- 30 ppm OR +/- 3% of reading
  • Stability: < 2% of FS over life of sensor (15 years typical)
  • Warm Up Time : < 2 minutes (operational); 10 minutes (maximum accuracy)
  • Calibration: ABC Logic Algorithm
  • Manual Calibration Interval: Not required


  • 2x RJ 12 terminal (RS485 half duplex)
  • Baud rate: 2400 to 115200 bps
  • Protocol: Modbus, BACnet
  • MINI USB, Type B


  • ARM Cortex – M0+


  • Dimension: 100x123x27 mm
  • Construction: plastic, self-extinguishing (PC/ABS)
  • Wall mounting (standard electric box)
  • Cooling: internal air circulation


  • Operating temperature: 0°C to 50°C
  • Storage temperature: -40°C to 85°C
  • Relative humidity: 5% to 95%, no condensation
  • Ingress Protection Rating: IP20
  • For indoor installation

Power supply

  • 24 V AC/DC
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