The Energy Saving Opportunity: Every RTU (Rooftop HVAC Unit) produced in the last 18 years has an input and control capability for CO2 demand controlled ventilation (DCV). DCV allows buildings to save energy by modulating outside air based on actual occupancy rather than providing constant ventilation at full design occupancy. However most RTUs installed today are not connected to a CO2 sensor and therefore are missing out on the 15% to 50% savings that this approach can provide.
The Problem: Retrofitting RTUs with wired CO2 sensors is expensive and labor intensive.
A Simple Solution: A wireless, battery powered CO2 sensor is placed in the space and a receiver is placed in the RTU that provides a 0-10 V signal into the RTU CO2 input. Total installation time is 30-45 minutes for one person.
A peer-to-peer, private WiFi connection is made between the sensor and receiver. This approach does not require connection to a local WiFi network, and eliminates the security concerns of owners who want to minimize third-party connections to their network.