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DHL Series Desiccant Heatless Dryers

The Sullair desiccant regenerative dryer family is ideal for outdoor piping and operations that require an extremely low dew point to -40°F (-40°C) (-4°F [-20°C] or -100°F [-73°F] optional). By combining the proven benefits of desiccant drying with the most advanced designs, Sullair offers a reliable system to clean and compressed air for the most critical applications.

Desiccant dryers adsorb moisture from the compressed air as the air passes through the desiccant. DHL Series dryers regenerate the desiccant without the use of heat. The dual tower design allows for continuous adsorption of moisture by alternating the adsorbing and regenerating towers.

Models vary by region. Please contact your Sullair sales representative for more details.

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Sullair DHL400 desiccant heatless dryers


80 – 5000 cfm


Maximum inlet pressure
230 psi


2.26 – 141.58 m³/min


Maximum inlet pressure
16.0 bar

  • 80 to 5000 scfm (2.26 to 141.58 m3/min)
  • Maximum inlet pressure: 230 psig (16.0 bar)
  • Maximum inlet temperature: 150°F (66°C)
  • Maximum ambient temperature: 122°F (50°C)

  • PLC controls with text display
  • Pre- and after-filter pre-piped and mounted
  • Field adjustable drying cycle time (10 –15 min.)
  • Pilot air filter
  • Easy front access control panel
  • -40°F (-40°C) pressure dew point
  • Fully automatic self-contained dryer
  • Adjustable purge valves
  • High quality valves
  • Purge flow indicator
  • ASME/CRN code welded pressure vessels
  • UL/CUL electrical certified
  • Separate drain and fill port
  • Robust steel frame with floor stand
  • Separate safety pressure relief valve for each tank
  • Stainless steel inlet/outlet diffusers

  • Demand Cycle Controller
  • NEMA 4, 4x enclosure
  • High pressure up to 500 psig
  • Failure to shift alarm
  • Pneumatic control timer
  • Optional voltage
  • High dew point alarm
  • Dew point monitoring system
  • -4°F (-20°C) and -100°F (-73°C) pressure dew point
  • 3 valve and 9 valve bypass options
  • Visual moisture indicator
  • Low ambient package
  • Sub-zero ambient package