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VDR Series Variable Speed Refrigerated Air Dryers
| PRODUCT | TYPE | FLOW | RATING |
|---|---|---|---|
| Refrigerated Air Dryer | Variable Speed Cycling | 2,600 to 8,450 SCFM | 203 psig / 158°F inlet |
Specifications
Configuration & Size
Sizes:
2,600, 3,150, 3,700, 4,200, 5,050, 6,350, 8,450 SCFM, each as A or W
Power:
460/3/60; 9.9 to 28.1 kW air-cooled, 6.1 to 19.7 kW water-cooled
Connections:
6 in ANSI flanges to 5,050 SCFM, 8 in at 6,350 and 8,450
Refrigerant:
R410A
Features
- Variable-speed scroll compressors slow down as the air load falls, so power drops with flow instead of holding at nameplate
- Electronic stepper-motor expansion control keeps the evaporator at the right superheat across the whole speed range
- Airflow detection drops the dryer into standby when the plant stops, and brings it back before the dew point moves
- Zero air loss drains as standard
Inverter-driven refrigeration
The compressor speed is the control
The VDR Series drives its scroll compressors through an inverter, so the refrigeration output follows the air load continuously rather than in steps or on-off cycles. Seven sizes from 2,600 to 8,450 SCFM come in air-cooled (A) and water-cooled (W) versions, the water-cooled units absorbing roughly a third less power. An electronic stepper-motor expansion valve, a touch-screen controller, zero air loss drains and a standby mode that idles the dryer when airflow stops complete the package. Against a non-cycling dryer of the same size the energy saving runs to 70 or 80 percent at typical plant loads, and the 158°F inlet rating gives room for a hot aftercooler.
Two cooling options, one controller. The VDR 2600 A draws 9.9 kW; the VDR 2600 W draws 6.1 kW for the same 2,600 SCFM; At 8,450 SCFM the air-cooled unit draws 28.1 kW and the water-cooled 19.7 kW; Touch-screen controller with the dew point, compressor status and alarm history on one display; 6 in ANSI flanges through 5,050 SCFM and 8 in on the two largest sizes.
What continuous modulation is worth. A non-cycling dryer of that size draws its full rating around the clock; the VDR 5050 A at 19.1 kW full load follows the plant down to a fraction of that; Take the water-cooled VDR 5050 W and the full-load figure itself drops to 12.8 kW, with 78 gpm of cooling water doing the rest; The saving is largest on a plant with long low-load hours: a second shift at half flow, weekends on standby.
VDR Series Part Numbers
| Part Number | SCFM | Connection | Voltage | Power | Dimensions (in) | Weight (lb) |
|---|---|---|---|---|---|---|
| VDR 2600 A | 2,600 | 6 in ANSI flange | 460/3/60 | 9.9 kW | 90.4 x 58 x 62.2 | 1,940 |
| VDR 3150 A | 3,150 | 6 in ANSI flange | 460/3/60 | 10.5 kW | — | — |
| VDR 3700 A | 3,700 | 6 in ANSI flange | 460/3/60 | 11.3 kW | — | — |
| VDR 4200 A | 4,200 | 6 in ANSI flange | 460/3/60 | 14.2 kW | — | — |
| VDR 5050 A | 5,050 | 6 in ANSI flange | 460/3/60 | 19.1 kW | — | — |
| VDR 6350 A | 6,350 | 8 in ANSI flange | 460/3/60 | 23.9 kW | — | — |
| VDR 8450 A | 8,450 | 8 in ANSI flange | 460/3/60 | 28.1 kW | — | — |
| VDR 2600 W | 2,600 | 6 in ANSI flange | 460/3/60 | 6.1 kW | — | — |
| VDR 3150 W | 3,150 | 6 in ANSI flange | 460/3/60 | 6.6 kW | — | — |
| VDR 3700 W | 3,700 | 6 in ANSI flange | 460/3/60 | 7.5 kW | — | — |
| VDR 4200 W | 4,200 | 6 in ANSI flange | 460/3/60 | 8.3 kW | — | — |
| VDR 5050 W | 5,050 | 6 in ANSI flange | 460/3/60 | 12.8 kW | 67.9 x 58 x 62.2 | 1,918 |
| VDR 6350 W | 6,350 | 8 in ANSI flange | 460/3/60 | 14.4 kW | — | — |
| VDR 8450 W | 8,450 | 8 in ANSI flange | 460/3/60 | 19.7 kW | — | — |
Ratings are at 100 psig and 100°F inlet with 100°F ambient or 84°F cooling water; the A and W suffixes are the air- and water-cooled builds, and cabinet dimensions for each size are given on the quote drawing.
VDR Series Applications
Cabinet size, flanges and cooling connections
One cabinet outline across the range; the water-cooled units are shorter.
The VDR 2600 A stands 90.4 in tall, 58 in wide and 62.2 in deep at 1,940 lb, with 6 in ANSI flanged air connections. The water-cooled VDR 5050 W is 67.9 in tall on the same 58 x 62.2 in footprint at 1,918 lb, and needs about 78 gpm of cooling water at 84°F. Flanges are 6 in through 5,050 SCFM and 8 in on the 6,350 and 8,450 SCFM units; the pipe should match the flange, since a reducer in a header this size adds pressure drop the dryer was designed to avoid.
Air-cooled units need free air at the condenser and a clear path for the warm discharge, with the room held inside the 45 to 115°F range; a ducted discharge is worth considering above 5,000 SCFM. Water-cooled units need supply and return with isolation valves and a strainer. Provide a line-size bypass, a pad rated for the operating weight, and a route from the zero-loss drains to a condensate treatment unit.
Dimensions and weights for every size and cooling type are confirmed on the drawing issued with the VDR quote.
Common FAQs
2,600 to 8,450 SCFM
- Sizes: 2,600, 3,150, 3,700, 4,200, 5,050, 6,350, 8,450 SCFM, each as A or W
- Power: 460/3/60; 9.9 to 28.1 kW air-cooled, 6.1 to 19.7 kW water-cooled
- Connections: 6 in ANSI flanges to 5,050 SCFM, 8 in at 6,350 and 8,450
- Refrigerant: R410A
- Inlet pressure: 30 to 203 psig
- Max inlet temperature: 158°F
- Ambient range: 45 to 115°F
- Pressure dew point: 37°F (3°C)
- Pressure drop: 2.2 to 3.9 psid at rated flow
