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8403-067 OBSOLETE
- Co2 Sensor With Relay
The Bard 8403-067 is an OEM CO2 sensor with relay used to support demand-controlled ventilation on compatible Bard wall-mounted equipment and ERV ventilation packages by monitoring indoor carbon dioxide levels and providing an output signal for ventilation control. This transmitter style control is commonly applied where the unit or ventilation controller accepts a modulating CO2 input, such as 4 to 20 mA or selectable voltage output, and it also includes a normally open SPST relay for CO2-based enable control when required. If you are troubleshooting ventilation that is not ramping correctly or verifying IAQ performance, replacing a drifting or failed CO2 transmitter with the correct Bard 8403-067 helps restore proper outdoor air delivery and stable system operation; always confirm wiring, output type selection, and setpoints against the unit wiring diagram and service manual for your specific model and revision.
Official replacement(s):
S8403-067
- CO2 SENSOR W/RELAY KIT