This is a blower purge 70 CFM twin tower desiccant air dryer in very good used condition.  This type of compressed air dryer is the most efficient because it uses a blower to regenerate the offline tower instead of wasting compressed air.  The machine has a few options such as filter housings, inlet air heeat exchanger, condensate drains and air temperature switch control of heat exchanger.   Unit was tested and it progressed through some of the steps in the cycle such as opening/closing pneumatic valves, turning on/off the blower and operating the heaters.  The machine is controlled with a PLC and Allen Bradley panelview 300 operator interface.  Unit is in very good operating condition.    

• design operating conditions:
• 52 CFM flow rate
• 125 PSI inlet
• 115 deg F inlet temp
• inlet moisure content: saturated
• outlet moisture content: -40 Deg dewpoint at line pressure
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• cycle time: 8 hours = 4 hrs on stream, 3 hrs heating and 1 hour cooling
• absorbant type: 3/16 activated alumna, 40 lbs per chamber
• purge blower: 4.9 cfm
• 3 psi max pressure drop
• 1" NPT connections
• temperature switch control of air cooler
• air to air heat exchanger for inlet air
• coalescing separator with automatic Suredrain timer
• prefiilter with automatic Suredrain timer
• regenerative blower for air purge
• after filter
• operating hours: 21,000