HDD Series (45-5,000 CFM)
Desiccant Compressed Air Dryers
Introducing Air Stream (HDD) & Legacy (DHL) Heatless compressed air dryer series by Next. In today’s demanding industrial environment, where moisture can wreak havoc on equipment and processes, it is crucial to invest in cutting-edge technology that safeguards your operations. That’s where our Heatless dryers come in.
Designed with globality in mind and built to excel, our regenerative dryers are the ultimate solution for moisture control in compressed air systems. Whether you operate in manufacturing, food processing, pharmaceuticals, or any other industry relying on compressed air, our dryers provide a vital shield against the damaging effects of moisture.
Our dryer series uses fully pneumatic stainless steel actuator valves rather than dated shuttle valves, this allows for independence of flow and pressure.
With some dryers being only region specific we made sure that all dryers produced by Next are certified with ASME, CRN, UL, CUL and CSA certification.
With industry standards of design pressure being up to 150 PSIG we thought it best to invest in the technical advantages and manufacture our pressure vessels to run at 250 PSIG as a standard. In addition, our dryers offer dewpoint ranges from -40 °F to -100 °F for maximum dryness.
Investing in our compressed air desiccant air dryers means investing in reliability, productivity, and peace of mind. With our expertise and commitment to excellence, we provide you with the tools to achieve superior air quality and protect your valuable equipment and processes.
HDD
- Mounted Filtration
- NHDC-2300, 4.6 HMI
- Touch Screen Controller
UL, CUL, Electrical Certifications - ASME, CRN Code
- Welded Pressure Vessel Certification
- Stainless Steel Angle
- Body Valves / Butterfly Valves
- Tower Pressure Relief
- Valves
- Purge Adjustment Valve
- Purge Flow indicator
- Horizontal Purge exhaust mufflers
- Tower Pressure gauges
- Stainless steel Desiccant strainers
- Counter-Current Re-pressurization
- Nema-12 Electrical enclosure
- Field adjustable Drying Cycle time (6,10,15 min)
- Separate Drain and Fill port
- Fail-Safe Design
- Common Alarm Output
NHDC 2300 Controller
- 4.6 Color touch screen HMI interface
- Energy management system
- Main display shows the following information
- Dewpoint
- Drying, Regenerating, and Repressurizing Side
- Time Remaining for each state
- Outputs 10+
- Digital Dewpoint Trend
- Alarm status
- Alarm log
- Process History
- Energy Savings
- Filter maintenance indicator
- Modbus TCP communication
- Remote Start Stop
Standard Operating Voltage
110, 115 V / 1 PH / 50-60 HZ – Standard
220 V / 1 PH / 50-60 HZ – Optional
24 V DC- Optional
Standard Outlet Pressure Dew Point
Pre & Post Filtration
Post-filtration grade μm
Pressure Vessel Certification
ASME, CRN ( HDD-80-2500) All Provinces
Control Panel Certification
Average Purge Air*
15%
Min/Max inlet air temperature ° F
40/120
Min/Max operating pressure psig
60/150
Model HDD Series Dryers
Alternate Voltages:
ALT-V-1 208-230 Volts / 1 Phase / 50-60 Hz
ALT-V-2 24 Volt DC
ALT-V-3 12 Volt DC
PC Pneumatic Control
Electrical Enclosure:
N4 NEMA 4 Electrical Enclosure
N4X-P NEAMA 4X Polycarbonate Electrical Enclosure
N4X NEMA 4X Stainless Steel Electrical Enclosure
N7 NEMA 7 Explosion Proof
Electrical Enclosure Controller:
ALT-C-1 NHDC-2201 (Digital Controller) – Standard on NHL Series Dryers
ALT-C-2 NHDC-2300 (Touch Screen Controller) -Standard on all HDD Series Dryers
ALT-C-3 NHABC (Allen Bradley Interface)
ALT-C-4 NHSC (Siemens Interface)
Condensate Drain:
EFD External Float Drain
EZLD Electronic Zero Loss Drain
PZLD Pneumatic Zero Loss Drain
HPTD High Pressure Timer Drain
Dew Point & Digital Monitoring:
DCC+DDP Demand Cycle Control
DDPM-40 Digital Dew Point Monitor (-40° F)
DDPM-100 Digital Dew Point Monitor (-100° F)
FTS Failure to Switch Alarm
DCA Dry Contact Alarm
ESS Emergency Stop Switch
RSS Remote Start / Stop
Bypass:
3VBP Three Valve Bypass
9VBP Nine Valve Bypass
Filtration:
DPF Dual Pre Filter (1 μm , .01 μm)
SP-F Special Filter Configuration
FS Filter Skid
Packages:
LAP Low Ambient Package
SZ Subzero Package
RS Rental Skid
Construction:
NYM No Yellow Metal
SP-DIM Special – Dimension
SP-FLTR Special Filter Configuration
CSA Canadian Standards Association
CRN Canadian Registration Number (3000+ cfm)
BTS Built to Suit
IOPG Inlet-Outlet Pressure Gauge
IOTG Inlet-Outlet Temperature Gauge
TTG Tank Mounted Temperature Gauge
VMI Visual Moisture Indicator
SST Stainless Steel Control Air Tubing
CR Control Line Pressure Regulator
EPH Electrical Panel Heater
AC Aftercooler
TAG Standard Stainless Steel ID Tags
MGP Marine Grade 2 Part Epoxy Primer & Paint
Your next step toward working with NEXT Air & Gas is to contact us for a Quote. Fill out the information below and give us the appropriate information needed to get started. Be sure to fill out all the contact information and our team will reach out with any questions or concerns.
If you’d rather speak to Sales Engineering, feel free to contact us at (865) 635-8178.
Below are links to product information and brochures. Please click and download at your convenience. If you have any questions or suggestions on materials you think would be helpful, please call us at (865) 635-8178.
Principle of Operation
The twin tower design allows for continuous adsorption of water vapor from compressed air by using the X-PACK – a hygroscopic desiccant with high crush strength and a high surface/volume ratio. Drying is accomplished by passing compressed air through one desiccant bed adsorbing moisture while the other is being simultaneously regenerated with the expanded purge air. Regeneration of desiccant is accomplished without the use of heat. The wet bed is dried by diverting a small portion of the super-dry air from the outlet at near atmospheric pressure. The purge flow rate is adjustable to suit the specific outlet conditions (desired dewpoint). The super dry air flows in a counter direction through
the wet bed, sweeping all the water vapor previously adsorbed by the desiccant. The DDC-15 microprocessor controller monitors the automatic operation of the dryer and provides options for load management, fixed cycle and dewpoint based control. Next Air & Gas ensures pressure equalization in the twin towers prior to switching. This prevents line surge and minimizes desiccant attrition. The tower being reactivated will be gradually re-pressurized at the end of its reactivation cycle before switchover takes place. Purge flow and de-pressurization are in a downward direction, counter flow to the drying air flow.
Next Air & Gas Performance Advantages
The performance of any desiccant dryer depends on the quality of its key components. Next Air & Gas uses the best available valves, controllers and desiccant. With accurately designed and sized components, the dryers are manufactured to provide you with years of trouble-free operation.
Electronic Controllers Provide The Information You Need
All Next Air & Gas heated desiccant regenerative dryers are equipped with the state of the art PLC controllers that regulate and monitor dryer function. A simple user interface allows the operator to quickly enter settings and monitor operations, including dewpoint selection, energy cycle, diagnostics, and more. The unit can also be connected to a remote computer.
Digital Dewpoint Transmitters Optimize Operations
The digital dewpoint transmitters are compact, reliable and continuously monitor the dryer performance. With available options, monitors can be used as indicators, alarm units or as controllers. A simple interface permits the operator to choose between multiple units, output the data to a PC, set alarm levels and do field calibration of the sensor.
Quality Desiccant Media
Next Air & Gas uses a mixture of adsorption media in its heatless range of desiccant dryers to achieve consistent dewpoint. Activated Alumina, Molecular Sieve and Silica Gel are used in varying ratios depending on the application. The long lasting, high crush strength media has a very high surface/volume ratio.
Super-Tough, Maintenance-Free Bi-Directional Piston Valves
These non-lubricated, high quality, high performance, bi-directional piston valves are designed to handle the most severe conditions. They require no maintenance and come with a five-year limited warranty.
Butterfly Valves for Precise Control
These versatile, high-performance butterfly valves are used by Next Air & Gas to provide you with precision control and complete bubble-tight shut o . The digitally controlled actuators provide easy PLC interface and feature fast response time. The tongue-and-groove seat design feature ensures complete isolation of flowing media from the body and stem. Rugged and reliable, these valves are designed to provide years of trouble-free service.
Angle Body Piston Valve
These high-performance, 2-way direct acting valves are designed for reliability and durability. It uses a profiled disc in conjunction with a high-resolution compact positioner and linear feedback potentiometer to provide precise proportional flow. The stainless steel internals and a tough fiber composite actuator body, along with the use of oversized bearing and Viton® seals, make it possible to consistently provide smooth piston movement for years of trouble-free service.
