On-board programmable logic controller P/N 818-9001

compactinputsanalog inputs

The Discharge Air Controller (DAC) (P/N 818-9001) is a packaged HVAC control board for use either as a standalone controller or connected to a zone application in a Copeland supervisory controller. Site Supervisor and E2 BX building control systems both provide support for HVAC Zone applications. The DAC is capable of controlling heat and cool stages, fans, dehumidification devices, and economizers using on-board I/O and control algorithms, as well as monitor and interact with other building control systems and peripherals (such as smoke alarms and CO2 sensors). The DAC supports local physical inputs and outputs and communicates with the E2 controller (version 3.00 and higher) via the RS485 MODBUS network. The E2 will support a maximum of 32 instances of the DAC to be added to a BX-300 or CX-300. The E2 will support a maximum of 50 DAC devices on a BX-400 or CX-400. The DAC supports 15 relay outputs, 6 analog outputs, 10 analog inputs, and 10 digital inputs. The compact size of the DAC allows technicians to field-mount the DAC in a rooftop unit or enclosure close to it, allowing for local connection of sensors and transducers. The board has 10 analog inputs and 20 digital inputs, with default configurations pre-loaded for quick connection to space temperature sensors, supply and return air temperature sensors, and fan proofs. Its 15 relay outputs, rated 2.0 amps max, are used for activating and deactivating fans, heat and cool stages, economizers, and other systems or devices. Its 6 analog outputs may be used for air damper, modulated heat and cool control, and variable- speed fan control.