NRD-SS Series (30-250 CFM)
Corrosion Resistant Non-Cycling Refrigerated Dryer
NEXT’S Pure-Stream NRD-SS Series (30-250 CFM) Refrigerated dryers are engineered and designed for the highest efficiency and performance under rigorous environmental conditions. With the use of the best available stainless steel, these dryers implement a 304 stainless steel high polished finish cabinet, to protect its internals from harsh environments.
The NRD-SS Series Refrigerated Dryers are designed to utilize the durability and efficiency of Stainless Steel.
Next’s 316 Stainless Steel Series Heat Exchangers, along with Premium Refrigeration Systems and Stainless-Steel enclosures, offer the most efficient and longest-lasting refrigerated compressed air dryers on the Market. While other manufactures use cheaper aluminum heat exchangers, which are susceptible to cracking or rust built up. Next’s Stainless Steel heat exchangers ensure the highest heat transfer efficiency and most consistent dew points available.
NRD-SS Series Features
- Stainless steel heat exchanger for maximum durability and corrosion resistance
- Liquid filled pressure gauge
- Oversized condenser for high ambient temperatures
- Robust refrigeration circuit with fan cycle switch and constant pressure expansion valve
- Supplied with 6’ power cord for plug and play opera.
- Built in timed solenoids drain for reliable condensate removal
- Stainless steel inlet and outlet connections
- C-UL & UL listed components
- Corrosion resistant stainless-steel panels
- Nema-4x rated electrical on/off switch certification
- Hermetically sealed compressors
- Nema-4x design for harsh environments and outdoor installations where ambient temperatures range from 35 to 115°F
- Low pressure drops and energy efficiency
- Easy installation and start up
Standard Operating Voltage
- 115V / 1 PH / 60 HZ – Standard (30 to 150 CFM)
- 208-230 VOLTS / 1 PHASE / 50-60 HZ (200+CFM)
ISO Dew point Class:
- CLASS 4 (ISO 8573-1)
Refrigerant
- R134a,
- R407c
Max Operating Pressure
- 250 psig
- 17 bar
Min/Max Design Pressure
- To 200 psig
- To 14 bar
Max Inlet Temperature
- 180° F ° C (30 To 125 CFM)
- 120° F ° C (150+ CFM)
Max Ambient air Temperature
- 35 To 115°F
- 1.6 To 46.1 ° C
Connection Type
- 1/2” to 1-1/2” npt.
Standard Outlet Pressure Dew Point
- 36 to 39° F /C
- 2 to 4°
Model NRD-SS Series Dryers
SS 30-100 CFM
SS 150-200 CFM
*Additional Flows Available Upon Request
Correction Factors
(1). Nema 4 is standard on all SS dryers
Sizing:
Air flow capacity = Operating Pressure x Inlet air Temperature
NRD-SS Optional Features
All refrigerated dryers come standard with a durable timer drain. A truly unique Electronic “NBM” and manual “NFD” zero loss drain is offered as an option. With the zero-loss drain, condensate is collected in a chamber, segregated from the air flow. As condensate builds, it activates a drain level sensor / float within its chamber. This opens an external solenoid / float drain to evacuate the condensate, closing the valve again before any air escapes. The drain cycle continually adjusts itself to working conditions.
Condensate Management
Electronic Zero Loss Drain
NTD- Series
Manual Zero Loss Float Drain
NFD- Series
Filtration
NFA-SERIES
- Pre-filtration grade μm 0.01
- Post-filtration grade μm 1.0
Next’s NFA Compressed Air Filters with High Performance Elements option is critical for optimum performance and efficiency
Construction
- Two Valve By-Pass
- Three Valve By-Pass
- Rugged Enclosed Rental Skid
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.
Open View
- Pressure Gauge
- On/Off Rocker Switch
- Flat Plate Heat Exchanger
- Timed Solenoid Condensate Drain
- Compressor
- Fan Motor
- Condenser
- Expansion Valve
Principle of Operation
Moisture jeopardizes everything you want your compressed air system to do. Failure to remove this water ruins the product and fouls the process. That’s why it is vital to have a reliable air treatment system in place to help protect your equipment and your operations.
Next Refrigerated Air Dryers reliably remove harmful moisture and contaminants from compressed air, helping protect your compressed air system, machinery and downstream tools.
- Saturated compressed air enters the system and is precooled in the air/air heat exchanger.
- Then, precooled air moves downstream through the air/refrigerant heat exchanger. The heat exchanger’s vertical profile design reduces condensed moisture by nearly 99% using gravitational force.
- To reliably prevent separated droplets from reentering the airstream, condensate collects in a large reservoir with subsequent recirculation where flow velocity is significantly reduced.
- Accumulated condensate is then discharged from the dryer via drain. The dried, cold process air passes back through the heat exchanger to be reheated — reducing relative air humidity and recovering up to 60% cooling capacity.
Non-Cycling dryers are ideal for running at full load because they maintain a constant energy consumption no matter the flow and air demand. Next’s NRD-SS non-cycling dryers use a hot gas bypass to maintain a stable dew point in varying operating conditions and control the amount of refrigerant circulating through the dryer.
Refrigeration Circuit
- Compressor
- Condenser
- Fan Motor
- High Pressure Heat Exchanger
- Condensate Discharge Valve
- Capillary Tube
- Dryer Filter
- By-Pass Valve
Next Air & Gas Performance Advantages
Stainless Steel Plate Heat Exchanger
The stainless-steel heat exchanger has been designed to offer maximum performance and minimum pressure drop. The 316 stainless steel corrosion-resistant heat exchanger is both an air-to-air heat exchanger as well as an air-to-refrigeration heat exchanger. The warm and humid air is pre-cooled by the cool dry air that is leaving the dryer, which increases efficiency.
- High-Quality Materials: Made of 316L stainless steel with 99% copper brazing at edges and contact points, forming a robust and leak-resistant unit that withstands high pressure and temperature. UL and CE certified for reliable quality.
- Efficient Heat Transfer: The high-conductivity stainless steel plates feature an asymmetrical herringbone pattern, creating intense pressure turbulence for efficient heating/cooling. With up to 99% heat efficiency, it generates 1100-1260K BTU per hour, saving pump power and electricity, reducing overall application costs.
- Large Heat Exchange Area: The heat exchanger features 5”x12” plates with up to 100 plates, providing excellent heat transfer performance for maximum efficiency.
- Tight and Leak-Proof: To eliminate the possibility of micro-leaks, the heat exchanger uses high-pressure vacuum brazing and undergoes helium leak testing, ensuring long life and high reliability.
On/Off Rocker Switch
Simple controls include:
- IP40, IP65 rated
- LED and Neon Illumination
- On/Off rocker designed switch
Condenser
The generous sizing of the condenser unit ensures maximum performance of the refrigerant circuit and the ability to operate with changes in ambient conditions quickly. Access to the condenser for cleaning and maintenance is simple. The generous sizing of the condenser ensures maximum performance of the refrigerant circuit and the ability to operate with changes in ambient conditions.
Stainless Steel Liquid Filled Pressure Gauge
- Dual Scale PSI/Kpa
- Stainless Steel Case & Bezel
- Brass Internals & NPT Connection
- Phosphor Bronze Bourdon Tube
- Ambient Temperature -30 F to 160˚F
- Liquid Filled Helps Dampen Effects of Pulsation and Vibration
- Liquid Filled Lubricates the Gauge Movement Keeping the Contaminates (Dirt) Away, Extending the Life of the Gauge
- ANSE 40.1 Compliant
Rugged Corrosion Resistant Construction
The NRD-SS series refrigerated dryers are built to be rugged and robust. The dryer is constructed with 304 stainless steel corrosion resistant panels, which is able to endure any environment that it’s set in.
Refrigeration Compressor
Circulation of the refrigerant in the cooling system is achieved through a variety of highly efficient types of compressors, pistons (reciprocating) and scroll type.
Hermetic Reciprocating PISTON (30-150 CFM)
Hermetic compressors are dependable, cost-effective, and incredibly versatile. An ideal choice for various air conditioning applications, these compressors can withstand harsh environments and have extended operating life cycles. Whether you’re looking for a dependable unit that saves on costs or a versatile option to meet your needs, the hermetic reciprocating compressors have you covered.
Scroll Compressors (200+ CFM)
The type of compressor used is the scroll. Widely used in the air conditioning and refrigeration sectors, the scroll compressor performs well and has low energy consumption. Compression of the refrigerant is achieved by way of two concentric coils: one fixed and the other rotating. The scrolls are wear-resistant, highly reliable and guarantee a high level of noise reduction.
Condensate Drain Controls
NRD-SS dryers are equipped with a timed solenoid condensate drain. The timed condensate drain is the most economic and efficient method of discharging unwanted condensate from compressed air systems.
Removal of condensate from compressed air systems is a critical maintenance requirement. Failure to carry out regular draining results in serious disruption to production schedules, deterioration in product quality, damage to sensitive pneumatic equipment, etc. The auto drain eliminates the risk of human error and possible costly aftermath by providing regular system drainage.
- Adjustable time scales to suit any condensate discharge times:
- ON Time: 0.5 – 10 Sec
- OFF Time: 0.5 – 45 Min
- Drain test switch to check functionality of unit
- Yellow LED’s to indicate status
