Full-size access doors, real-time self-diagnostic DDC [direct digital controls], media pre-filters to reduce cooling media service intervals, automated fill-and-drain system to extend media service life, direct-drive fan to eliminate belt service, and use of commonly available parts. The factory-installed DDC controls make the ASC unique in its class of equipment. The optional Web-based dashboard includes trend analysis, unit control functions, alarms, etc., but also includes instantaneous and historical kW demand, daily and historical kWh power consumption, and a service interval-countdown timer.