This diagram demonstrates an exhaust synchronized system where the CO2 equipment is disabled during exhaust functions and immediately replenished when exhaust is completed. The CT-DH-3P temperature and humidity controller activates the exhaust fan and shuts off the CO2 during the exhaust cycle. It has a built in photo sensor to limit CO2 enrichment to photoperiods only. Enrichment will only occur when exhaust fan is off and light is present.The CO2 “On” cycles are timed by the Cyclestat repeat cycle timer which cycles the CO2 equipment according to your preset periods. An example might be that the timer is set for 5 minutes every hour. The CO2 generator would be operated according to that hour schedule. In the event that there is an exhaust function at any time the CO2 will come on for 5 minutes immediately after the exhaust cycle is completed. It will repeat again one hour after that point. Replenishment of CO2 will always follow an exhaust cycle to maintain a constant and continuous enrichment level.
