VDR Variable Speed Refrigerated Air Dryer By Nano

The nano VDR variable speed refrigerated air dryer is engineered for large industrial compressed air systems that need dependable moisture removal without the energy penalty of a traditional non-cycling dryer. Rated from 2,600 to 8,450 SCFM, the VDR uses variable speed (VSD) scroll refrigeration compressors to hold a stable +37.4°F pressure dew point while drawing only the power your real-time air demand requires.

How variable speed drying saves energy

1. Onboard sensors continuously monitor compressed air flow and dew point.
2. The VSD scroll compressor ramps its speed up or down to match only the load present at that moment.
3. Power consumption tracks actual demand instead of running at full capacity around the clock.
4. The dryer holds a consistent dew point across changing loads, delivering up to 80% energy savings versus non-cycling refrigerated dryers and further savings compared with thermal-mass cycling designs.

Air-cooled vs. water-cooled: which to choose

Every capacity is offered in both configurations. Choose air-cooled for the simplest installation when the equipment room is well ventilated and stays within the 45–114.8°F ambient range. Choose water-cooled when the room runs hot or enclosed, when you already have a cooling-water loop, or when you want the lowest absorbed power, since water-cooled models draw meaningfully less electrical power at the same flow.

How the VDR compares

Against a fixed-speed non-cycling refrigerated dryer, the VDR delivers the same clean, dry air at a fraction of the running cost because it never runs harder than the load demands. Against a thermal-mass cycling dryer, it responds instantly to load swings without waiting on a thermal reservoir. If your process requires a much lower dew point (for example −40°F for outdoor lines or critical instruments), a desiccant dryer is the right tool; for general plant air at ISO 8573.1 Class 4, the VDR is the energy-efficient choice.

Sizing guidance

Capacities are referenced at 100 psig. Actual throughput varies with inlet pressure, inlet air temperature, and ambient temperature, so size the dryer to your peak demand at your site conditions rather than nameplate flow alone. Use nano's R-Series application worksheet or contact our team and we will confirm the right model and cooling type for your compressor and environment.

Key features

• Variable speed (VSD) scroll compressor that matches power draw to real-time flow
• Up to 80% energy savings versus non-cycling refrigerated dryers
• Stable +37.4°F dew point across fluctuating loads
• Zero compressed air consumed during operation
• Compact all-in-one design, delivered ready to install
• Low-emission, zero-ozone-depletion R-410A refrigerant
• Available air-cooled or water-cooled

Specifications

• Flow rate: 2,600 – 8,450 SCFM at 100 psig
• Connections: 6" to 8" flange
• Air quality: ISO 8573.1:2010 Class 4
• Pressure dew point: +37.4°F
• Operating pressure: 30 – 203 psig
• Max inlet temperature: 158°F
• Ambient range: 45 – 114.8°F
• Power supply: 460V / 60Hz / 3-phase
• Refrigerant: R-410A

Ideal applications

• Manufacturing plants and central compressor rooms
• Automotive and metal fabrication
• Food and beverage processing
• Any high-demand system where energy cost and dew point stability matter

Frequently asked questions

How much energy does the VDR actually save?
Because compressor speed follows the load, the VDR can cut drying energy by up to 80% compared with a non-cycling refrigerated dryer, with additional savings over thermal-mass cycling models.

What dew point does it hold?
A pressure dew point of +37.4°F, meeting ISO 8573.1 Class 4, suitable for most general industrial compressed air.

Does it consume compressed air?
No. Unlike desiccant dryers, the VDR uses no purge air, so none of your compressed air is lost in the drying process.

Should I choose air-cooled or water-cooled?
Air-cooled is simplest for well-ventilated rooms within the rated ambient range; water-cooled suits hot or enclosed rooms and draws less electrical power where cooling water is available.

How do I size the right model?
Match the dryer to your peak demand at your actual pressure, inlet temperature, and ambient conditions. Send us your compressor details and we will confirm the correct VDR model.

By varying compressor speed to match load, the nano VDR delivers reliable ISO Class 4 compressed air while significantly lowering operating cost compared with fixed-speed non-cycling and thermal-mass refrigerated dryers, making it a strong choice for facilities focused on energy efficiency and total cost of ownership.