Honeywell Series 72 Economizer Logic Module with analog input from two Indoor Air Quality sensors (commonly Carbon Dioxide Sensors)

Use with C7400A, or C7660 and C7150B or C7046 Sensors; Demand Control Ventilation (DCV) sensor C7232 C02 sensor (2-10 Vdc); and Honeywell Series 72 actuators, or M7415 Damper Actuator to proportion outdoor and return air dampers for economizer and ventilation control in commercial HVAC equipment. (See below) Features Input from DCV C02 sensor provides optimum ventilation based on occupancy. All models include air change and shutdown; "A" models also provide prepurge. Demand control ventilation economizer provides comfort, energy savings, reliability, air quality compliance and application flexibility in heating, cooling and ventilating applications. Combines solid state enthalpy or dry bulb changeover control, minimum and maximum damper position potentiometer and DCV setpoint functions. Optional differential enthalpy control (enthalpy setpoint D with two C7400A sensors) provides greater economizer savings and maximum comfort over single enthalpy control by selecting the most economical method for cooling. ...