CO2 Sensor

The default CO₂ unit is ppm, and it is displayed together with the CO₂ sensor value (if active) permanently (not editable). The CO₂ actual sensor value is displayed in delay of 120 sec after the room panel restart or power supply connection (if the bit 0 of the CO₂ configuration is true). The CO₂ sensor needs up to 2 minutes to warm up from the moment of power supply connection. The CO₂ sensor achieves maximum accuracy after 10 minutes of operation. It is worth mentioning that the built-in CO₂ sensor does not need a manual calibration. Calibration algorithm begins after 24 hours of continuous operation, adjusting the sensor measurement.

WARNING! All registers described below are active only if the room panel is equipped with a built-in CO₂ sensor.

CO₂_SENSOR_ACTUAL_VALUE (30303)

The 30303 register stores an actual value from the CO₂ sensor (including CO₂ Sensor Offset).

CO₂_SENSOR_OFFSET (40306)

The register contains a value which allows for setting a correction of the CO₂ sensor actual value indication. The offset value can be positive or negative. The actual CO₂ offset value is added to the CO₂ sensor indication. The default offset is 0.

CO₂_FILTER (40309)

The register contains a time constant for the CO₂ sensor low pass filter. The value is expressed in seconds. The default filter value is 60 seconds. Setting the 0 value disables the filter.

CO₂_NAME (40314)

The 32-bit register contains up to 4 characters (ASCII code), which can be displayed as a text (name) on the 14-segment display block together with the CO2_SENSOR_ACTUAL_VALUE register (displayed on the 8-segment display block). In case when a particular character value is 0 (NULL), the character is not displayed. Lower case characters are automatically changed into upper case characters. The default value is 838878031, which corresponds to the text “CO₂”.

CO₂_CONFIGURATION (40318, Bit 0)

The bit 0 of the register 40318 is responsible for activation or deactivation of the visibility of the CO₂ sensor. If the bit 0 is active, the CO₂ sensor’s actual value is visible in the main menu. The default value is true (visible).

WARNING! The CO₂ value is visible with delay of 120 sec after the room panel restart or power supply connection.

CO₂_SETPOINT_FOR_ALARM (40226)

The register contains a setpoint for the alarm value in ppm. If the actual CO₂ sensor value increases over the setpoint value, then the room panel indicates the CO₂ alarm (for other indication possibilities see the Device Configuration Modbus section). The default value is 1500 ppm.

CO2_DIFFERENTIAL_FOR_ALARM (40227)

The register contains a value in ppm which is the differential for the CO₂ alarm value. The CO₂ alarm is activated if the CO₂ actual sensor value is higher or equal to the sum of the CO2_SETPOINT_FOR_ALARM register value and the CO₂ differential for the alarm value. The CO₂ alarm is inactive if the CO₂ actual sensor value is lower or equal to the difference of the CO2_SETPOINT_FOR_ALARM register value and the CO₂ differential for the alarm value. The default value is 100 ppm.

CO₂ Alarm ON:

CO₂ sensor actual value >= CO2 SetpointforAlarm + CO2 differential for alarm

CO₂ Alarm OFF:

CO₂ sensor actual value <= CO2 SetpointforAlarm - CO2 differential for alarm

CO2 alarm with differential for active alarm