R4 direct expansion
refrigerated air dryers

Some of the many features and benefits:

  • patented large surface area heat exchanger boasts corrosion resistant construction and integrated moisture separator

  • simple to use CAREL digital microprocessor features dew point, high and low pressure and drain operation

  • powder coated aluminum panels are corrosion resistant

  • TXV ensures stable dew point performance even in changing ambient conditions

  • environmentally friendly R134a or R407C refrigerants are recognized as both efficient and safe

  • timed solenoid drain is fully adjustable and extremely reliable

  • small footprint, lightweight and ready to go out of the box

  • oversized condenser uses a high pressure fan switch to protect refrigeration circuit to provide visual high and low pressure alarms

nano NDX direct expansion refrigerated air dryers allow customers running a consistent volume of compressed air the ability to achieve excellent dew point performance and save energy.


The high-quality SSX stainless steel heat exchangers (multi-module NDX 1750 and up), environmentally-friendly refrigerants and reliable compressors make NDX the best value go-to air dryer in the industry.

Reliability is built in...and backed by our 2 year warranty with pre-filtration and non-corrosive piping installed

NDX refrigeratd air dryers

support materials 
R4 direct expansion refrigerated air dryers


R4 NDX direct expansion refrigerated air dryers brochure

refrigerated air dryer sizing

nano refrigerated air dryer application worksheet


ISO 8573 compressed air quality standards