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The HLS34 is specifically designed for individual roomtemperature and zone control applications. The HLS34 controller has built-in RS-485 channel for Modbuscommunication. Controllers can be connected to anysupervisory software / system supporting Modbus RTU.
The HLS34 has built-in display and unique touchsensitive buttons for adjusting the user parameters andfor configuring the controller.This controller supports 0...10V actuators, 3-pointcontrolled actuators and thermic actuators.One of the 0…10Vdc outputs of the controller can be configured for a fan speed control via FCRY3 relay module or it can be used for VAV control.The controller has DAY and NIGHT operating modes.When in the NIGHT mode the controller can beoverridden to the DAY mode via a hardware input orby touching day extension button or via the MODBUSnetwork. Return to NIGHT mode is automatic after preset delay.The controller has also a CO2 measurement input forboosting the ventilation (fan speed) in case of high CO2 level in the room space.