DD · DB Series Refrigerated Compressed Air Dryers
The first +3 °C of clean, dry, workable air
Cycling refrigeration dryers from 3.8 to 320 Nm³/min, air or water cooled, fixed speed (DD) or inverter driven (DB), with a stainless air-to-air economiser on every frame and a demand drain fitted as standard. A refrigeration dryer chills the air to just above freezing, separates the condensate while the air is cold, then reheats it against the incoming stream.
Models: DD & DB Series · 109 models · Compressed air dryers
- +3 °C Pressure dew point
- 109 Models in the range
- 320 Nm³/min top capacity
- 6–10 bar g working range
Key specifications
| Pressure dew point | +3 °C |
|---|---|
| Working pressure | 6 – 10 bar g |
| Pressure drop at rating point | 0.1 bar |
| Rating point inlet air | 50 °C |
| Rating point ambient | 32 °C |
| Cooling water at rating point | 30 °C, 0.2 – 0.4 MPa |
| Condensate discharge | Demand drain |
| Medium handled | Compressed air, non-corrosive gas |
Why this range
- DD fixed speed cycles on a thermal mass; DB inverter speed follows the air demand, so power falls continuously at part load
- Stainless steel air-to-air economiser pre-cools incoming air at no extra power
- Air cooled (A) and water cooled (W) frames; water cooled frames hold dew point on hot plant floors
- Demand drain fitted as standard — no timer drain blowing compressed air
- 0.1 bar pressure drop at the rating point
Models and technical data
DD Series — air cooled
| Model | Nm³/min | scfm | kW | Air connection | L × W × H mm | kg | Max inlet air °C | Max amb. °C |
|---|---|---|---|---|---|---|---|---|
| DD30A | 3.8 | 146 | 1.50 | G1-1/2" | 1050 × 600 × 1100 | 202 | 60 | 42 |
| DD50A | 6.5 | 250 | 2.35 | G1-1/2" | 1100 × 600 × 1100 | 220 | 60 | 42 |
| DD75A | 10.5 | 403 | 2.70 | G2" | 1350 × 700 × 1205 | 276 | 60 | 42 |
| DD100A | 13.5 | 518 | 3.20 | DN65/2-1/2" | 1450 × 800 × 1200 | 326 | 60 | 42 |
| DD120A | 17 | 653 | 4.90 | DN80/3" | 1500 × 800 × 1200 | 352 | 60 | 42 |
| DD150A | 21.5 | 826 | 5.05 | DN80/3" | 1500 × 800 × 1200 | 365 | 60 | 42 |
| DD180A | 25 | 960 | 5.20 | DN80/3" | 1750 × 940 × 1500 | 486 | 60 | 42 |
| DD200A | 28.5 | 1095 | 5.30 | DN80/3" | 1750 × 940 × 1500 | 490 | 60 | 42 |
| DD250A | 32 | 1229 | 6.95 | DN80/3" | 1750 × 940 × 1500 | 505 | 80 | 42 |
| DD300A | 37 | 1421 | 9.80 | DN100/4" | 1900 × 980 × 1580 | 680 | 80 | 42 |
| DD350A | 41.5 | 1594 | 9.80 | DN100/4" | 1900 × 980 × 1610 | 657 | 60 | 42 |
| DD400A | 45 | 1728 | 11.70 | DN100/4" | 1900 × 980 × 1610 | 657 | 80 | 42 |
| DD450A | 50 | 1920 | 12.50 | DN125/5" | 2150 × 1000 × 1730 | 830 | 80 | 42 |
| DD500A | 55 | 2112 | 12.50 | DN125/5" | 2150 × 1000 × 1700 | 835 | 60 | 42 |
| DD550A | 60 | 2304 | 14.10 | DN125/5" | 2150 × 1000 × 1730 | 856 | 60 | 42 |
| DD600A | 65 | 2496 | 14.90 | DN125/5" | 2150 × 1000 × 1700 | 856 | 80 | 42 |
| DD700A | 75 | 2880 | 19.20 | DN125/5" | 2400 × 1200 × 2305 | 1320 | 60 | 42 |
| DD800A | 85 | 3264 | 21.50 | DN125/5" | 2400 × 1200 × 2305 | 1370 | 60 | 42 |
| DD900A | 95 | 3648 | 23.50 | DN150/6" | 2450 × 1200 × 2250 | 1680 | 60 | 42 |
| DD1000A | 100 | 3840 | 23.50 | DN150/6" | 2450 × 1200 × 2250 | 1750 | 60 | 42 |
| DD1100A | 110 | 4224 | 28.50 | DN150/6" | 2450 × 1200 × 2250 | 1850 | 60 | 42 |
| DD1200A | 120 | 4609 | 28.50 | DN150/6" | 2450 × 1200 × 2250 | 1890 | 60 | 42 |
Rating point: 50 °C inlet air, 7 bar g, 32 °C ambient.
DD Series — water cooled
| Model | Nm³/min | scfm | kW | Air connection | Water m³/h | L × W × H mm | kg | Max inlet air °C | Max amb. °C |
|---|---|---|---|---|---|---|---|---|---|
| DD100W | 13.5 | 518 | 3.10 | DN65/2-1/2" | 3 | 1400 × 800 × 1200 | 350 | 80 | 40 |
| DD120W | 17 | 653 | 4.20 | DN80/3" | 4 | 1500 × 800 × 1200 | 352 | 60 | 40 |
| DD150W | 21.5 | 826 | 4.50 | DN80/3" | 4 | 1450 × 800 × 1200 | 380 | 60 | 40 |
| DD180W | 25 | 960 | 4.50 | DN80/3" | 5 | 1650 × 940 × 1480 | 485 | 60 | 40 |
| DD200W | 28.5 | 1095 | 5.40 | DN80/3" | 5.5 | 1750 × 940 × 1530 | 477 | 60 | 40 |
| DD250W | 32 | 1229 | 5.75 | DN80/3" | 6 | 1750 × 940 × 1500 | 495 | 80 | 40 |
| DD300W | 37 | 1421 | 7.65 | DN100/4" | 7 | 1900 × 980 × 1610 | 642 | 60 | 40 |
| DD350W | 41.5 | 1594 | 9.05 | DN100/4" | 8 | 1900 × 980 × 1580 | 565 | 80 | 40 |
| DD400W | 45 | 1728 | 10.50 | DN100/4" | 8 | 1900 × 980 × 1580 | 780 | 60 | 40 |
| DD450W | 50 | 1920 | 11.35 | DN125/5" | 10.5 | 2150 × 1000 × 1700 | 824 | 60 | 40 |
| DD500W | 55 | 2112 | 11.35 | DN125/5" | 12 | 2150 × 1000 × 1700 | 825 | 80 | 40 |
| DD550W | 60 | 2304 | 12.60 | DN125/5" | 15 | 2150 × 1000 × 1700 | 850 | 60 | 40 |
| DD600W | 65 | 2496 | 13.65 | DN125/5" | 16 | 2150 × 1000 × 1700 | 855 | 60 | 40 |
| DD700W | 75 | 2880 | 17.90 | DN125/6" | 18 | 2400 × 1200 × 1980 | 1390 | 60 | 40 |
| DD800W | 85 | 3264 | 19.05 | DN125/6" | 18 | 2450 × 1200 × 1980 | 1450 | 55 | 40 |
| DD900W | 95 | 3648 | 23.50 | DN150/6" | 22 | 2450 × 1200 × 2250 | 1750 | 60 | 40 |
| DD1000W | 100 | 3840 | 23.50 | DN150/6" | 22 | 2450 × 1200 × 2250 | 1750 | 60 | 40 |
| DD1100W | 110 | 4224 | 27.20 | DN150/6" | 25 | 2550 × 1200 × 1950 | 1825 | 60 | 40 |
| DD1200W | 120 | 4609 | 27.20 | DN150/6" | 25 | 2450 × 1200 × 2250 | 1850 | 80 | 40 |
| DD1300W | 130 | 4993 | 35 | DN250/12" | 35 | 3000 × 1400 × 2330 | 1850 | 80 | 40 |
| DD1400W | 140 | 5377 | 35.45 | DN200/8" | 30 | 3000 × 1400 × 2200 | 1980 | 80 | 40 |
| DD1500W | 150 | 5761 | 36 | DN200/8" | 30 | 3000 × 1400 × 2200 | 1980 | 60 | 40 |
| DD1600W | 160 | 6145 | 38 | DN200/8" | 35 | 3000 × 1400 × 2330 | 1980 | 60 | 40 |
| DD2100W | 210 | 8065 | 57.05 | DN200/8" | 32 | 3450 × 1500 × 2330 | 1980 | 80 | 40 |
| DD2300W | 230 | 8833 | 43 | DN250 | 42 | 3900 × 2000 × 1985 | 3450 | 60 | 40 |
| DD2500W | 250 | 9601 | 45 | DN250 | 50 | 3900 × 2000 × 1985 | 3550 | 45 | 40 |
Water flow at 30 °C inlet and 0.2–0.4 MPa.
DB Series — air cooled (inverter)
| Model | Nm³/min | scfm | kW | Air connection | L × W × H mm | kg | Max inlet air °C | Max amb. °C |
|---|---|---|---|---|---|---|---|---|
| DB30A | 3.8 | 146 | 1.50 | DN40thd/1-1/2" | 1050 × 600 × 1100 | 202 | 60 | 42 |
| DB50A | 7 | 269 | 1.42 | DN40thd/1-1/2" | 1200 × 600 × 1155 | 222 | 80 | 42 |
| DB75A | 10.5 | 403 | 2.30 | DN50thd/G2" | 1350 × 700 × 1205 | 276 | 80 | 42 |
| DB100A | 13.5 | 518 | 3.20 | DN65/2-1/2" | 1450 × 800 × 1200 | 325 | 60 | 42 |
| DB120A | 17 | 653 | 4.90 | DN80/3" | 1500 × 800 × 1200 | 365 | 60 | 42 |
| DB150A | 21.5 | 826 | 4.80 | DN80/3" | 1500 × 800 × 1200 | 365 | 60 | 42 |
| DB180A | 25 | 960 | 5.50 | DN80/3" | 1750 × 940 × 1500 | 495 | 80 | 42 |
| DB200A | 28.5 | 1095 | 6.70 | DN80/3" | 1750 × 940 × 1500 | 499 | 80 | 42 |
| DB250A | 32 | 1229 | 8.50 | DN80/3" | 1750 × 940 × 1500 | 514 | 80 | 42 |
| DB300A | 37 | 1421 | 10 | DN100/4" | 1900 × 980 × 1610 | 643 | 60 | 42 |
| DB350A | 41.5 | 1594 | 9.80 | DN100/4" | 1900 × 980 × 1610 | 645 | 80 | 42 |
| DB400A | 45 | 1728 | 11.70 | DN100/4" | 1900 × 980 × 1610 | 645 | 60 | 42 |
| DB450A | 50 | 1920 | 12.30 | DN125/5" | 2150 × 1000 × 1730 | 830 | 60 | 42 |
| DB500A | 55 | 2112 | 12.50 | DN125/5" | 2150 × 1000 × 1730 | 830 | 60 | 42 |
| DB550A | 60 | 2304 | 15 | DN125/5" | 2150 × 1000 × 1730 | 850 | 60 | 42 |
| DB600A | 65 | 2496 | 14.90 | DN125/5" | 2150 × 1000 × 1730 | 850 | 60 | 42 |
| DB700A | 75 | 2880 | 19 | DN125/PN10/5" | 2400 × 1200 × 2305 | 1320 | 55 | 42 |
| DB800A | 85 | 3264 | 18.50 | DN125/5" | 2400 × 1200 × 2305 | 1370 | 60 | 42 |
| DB900A | 95 | 3648 | 22.50 | DN150/6" | 2550 × 1200 × 2335 | 1680 | 60 | 42 |
| DB1000A | 100 | 3840 | 22.50 | DN150/6" | 2450 × 1200 × 2250 | 1710 | 80 | 42 |
| DB1100A | 110 | 4224 | 28.50 | DN150/6" | 2550 × 1200 × 2335 | 1680 | 60 | 42 |
| DB1200A | 120 | 4609 | 28.50 | DN150/6" | 2550 × 1200 × 2250 | 1680 | 60 | 42 |
| DB1300A | 135 | 5185 | 35 | DN200/8" | 3100 × 1400 × 2335 | 2450 | 60 | 42 |
| DB1400A | 140 | 5377 | 35.45 | DN200/8" | 3100 × 1400 × 2330 | 1880 | 60 | 46 |
| DB1500A | 150 | 5761 | 36 | DN200/8" | 3100 × 1400 × 2430 | 1880 | 60 | 46 |
| DB2400A | 240 | 9217 | 43 | DN200/8" | per GA drawing | 1880 | 60 | 42 |
kW is the installed rating; running power follows the load.
DB Series — water cooled (inverter)
| Model | Nm³/min | scfm | kW | Air connection | Water m³/h | L × W × H mm | kg | Max inlet air °C | Max amb. °C |
|---|---|---|---|---|---|---|---|---|---|
| DB100W | 13.5 | 518 | 3.20 | DN65/2-1/2" | — | 1450 × 800 × 1200 | 350 | 60 | 40 |
| DB120W | 17 | 653 | 4.90 | DN80/3" | — | 1500 × 800 × 1200 | 440 | 60 | 40 |
| DB150W | 21.5 | 826 | 5.05 | DN80/3" | — | 1500 × 800 × 1200 | 450 | 60 | 40 |
| DB180W | 25 | 960 | 5.20 | DN80/3" | — | 1750 × 940 × 1500 | 440 | 55 | 40 |
| DB200W | 28.5 | 1095 | 5.30 | DN80/3" | — | 1750 × 940 × 1500 | 450 | 55 | 40 |
| DB250W | 32 | 1229 | 6.95 | DN80/3" | — | 1750 × 940 × 1500 | 501 | 55 | 40 |
| DB300W | 37 | 1421 | 9 | DN100/4" | 8 | 1900 × 980 × 1610 | 630 | 60 | 40 |
| DB350W | 41.5 | 1594 | 9.80 | DN100/4" | 7 | 1900 × 980 × 1610 | 680 | 60 | 40 |
| DB400W | 45 | 1728 | 11.70 | DN100/4" | 8 | 1900 × 980 × 1610 | 650 | 55 | 40 |
| DB450W | 50 | 1920 | 12.50 | DN125/5" | 8 | 2150 × 1000 × 1730 | 835 | 55 | 40 |
| DB500W | 55 | 2112 | 12.50 | DN125/5" | 11 | 2150 × 1000 × 1730 | 865 | 55 | 40 |
| DB550W | 60 | 2304 | 11 | DN125/5" | 13 | 2150 × 1000 × 1700 | 840 | 60 | 40 |
| DB600W | 65 | 2496 | 14.90 | DN125/5" | 14 | 2150 × 1000 × 1700 | 850 | 60 | 40 |
| DB700W | 75 | 2880 | 19.20 | DN125/5" | 15 | 2400 × 1200 × 1980 | 585 | 55 | 40 |
| DB800W | 85 | 3264 | 21.50 | DN125/5" | 15.5 | 2400 × 1200 × 1980 | 1420 | 55 | 40 |
| DB900W | 95 | 3648 | 23.50 | DN150/8" | 16.5 | 2550 × 1200 × 1950 | 1680 | 60 | 40 |
| DB1000W | 100 | 3840 | 23.50 | DN150/8" | 16.5 | 2550 × 1200 × 1950 | 1680 | 60 | 40 |
| DB1100W | 110 | 4224 | 28.50 | DN150/6" | 18 | 2550 × 1200 × 1950 | 1680 | 60 | 40 |
| DB1200W | 120 | 4609 | 28.50 | DN150/6" | 20 | 2550 × 1200 × 1950 | 1853 | 60 | 40 |
| DB1300W | 130 | 4993 | 35 | DN200/8" | 23 | 3000 × 1400 × 2330 | 2250 | 60 | 40 |
| DB1400W | 140 | 5377 | 35.45 | DN200/8" | 23 | 3000 × 1400 × 2330 | 2260 | 60 | 40 |
| DB1500W | 150 | 5761 | 36 | DN200/8" | 24 | 3000 × 1400 × 2330 | 1880 | 60 | 40 |
| DB1600W | 160 | 6145 | 25 | DN200/8" | 24 | 3000 × 1400 × 2330 | 1880 | 60 | 40 |
| DB1650W | 165 | 6337 | 38 | DN200/8" | 24 | 3100 × 1650 × 2055 | 1780 | 60 | 40 |
| DB1700W | 170 | 6529 | 29 | DN200/8" | 28 | 3400 × 1300 × 2000 | 1680 | 60 | 40 |
| DB1800W | 180 | 6913 | 25 | DN200/8" | 25 | 3450 × 1500 × 2330 | 2450 | 60 | 40 |
| DB1900W | 195 | 7489 | 29 | DN200/8" | 32 | 3450 × 1500 × 2330 | 1980 | 55 | 40 |
| DB2000W | 200 | 7681 | 29 | DN200/8" | 32 | 3450 × 1500 × 2330 | 1980 | 55 | 40 |
| DB2100W | 210 | 8065 | 57.05 | DN200/8" | 32 | 3450 × 1500 × 2330 | 1980 | 60 | 40 |
| DB2200W | 220 | 8449 | 57.05 | DN200/8" | 39 | 4000 × 1650 × 2500 | 2450 | 60 | 40 |
| DB2300W | 230 | 8833 | 39.50 | DN250/10" | 40 | 4000 × 1650 × 2530 | 2450 | 60 | 40 |
| DB2500W | 250 | 9601 | 45 | DN250/10" | 39 | 3800 × 1800 × 2200 | 2450 | 55 | 40 |
| DB2600W | 260 | 9985 | 45 | DN250/10" | 45 | 4000 × 1650 × 2600 | 2450 | 60 | 40 |
| DB3000W | 300 | 11521 | 52 | DN250/10" | 52 | per GA drawing | 2950 | 55 | 40 |
| DB3200W | 320 | 12289 | 44 | DN250/10" | 52 | 3400 × 1800 × 2200 | 2650 | 45 | 40 |
Correction factor F1 — working pressure × inlet air temperature
| Working pressure | 45 °C | 50 °C | 55 °C | 60 °C | 70 °C | 80 °C |
|---|---|---|---|---|---|---|
| 0.4 MPa (4 bar g) | 1.06 | 0.87 | 0.77 | 0.71 | 0.67 | 0.61 |
| 0.5 MPa (5 bar g) | 1.12 | 0.92 | 0.82 | 0.75 | 0.71 | 0.64 |
| 0.6 MPa (6 bar g) | 1.17 | 0.96 | 0.85 | 0.79 | 0.74 | 0.67 |
| 0.7 MPa (7 bar g) | 1.22 | 1.00 | 0.89 | 0.82 | 0.77 | 0.70 |
| 0.8 MPa (8 bar g) | 1.24 | 1.02 | 0.90 | 0.84 | 0.79 | 0.71 |
| 1.0 MPa (10 bar g) | 1.29 | 1.06 | 0.94 | 0.87 | 0.82 | 0.74 |
Maximum capacity = rated capacity × F1 × F2.
Correction factor F2 — ambient temperature
| Ambient | F2 |
|---|---|
| 30 °C | 1.03 |
| 32 °C (rating point) | 1.00 |
| 35 °C | 0.96 |
| 40 °C | 0.90 |
Where it is used
- Pharmaceutical and chemical plants
- Tyre and rubber
- Textiles and spinning
- Food and beverage
- Automotive and general engineering
- Any duty where +3 °C is enough