Atlas Copco CD 25+…260+
Adsorptive air dryer (cold regeneration)
Adsorptive compressed air dryer Atlas Copco CD+ series, non‑heated: two columns with adsorbent (activated aluminum oxide) operate alternately — one dries the air, the second is regenerated by a portion of the dried air through a nozzle. Controlled by DC1 controller or graphical Elektronikon (optionally with PDP dew‑point sensor). Manual includes: device and flow diagram, controller menus, installation, commissioning, start/stop, maintenance schedule, nozzle replacement, fault finding and technical data.
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Maintenance procedures
Initial start (or after prolonged shutdown / adsorbent replacement)
- If a bypass exists – open dryer bypass valves. p. 76
- Shut off air supply to PDP sensor (if installed). p. 76
- Close external inlet valve from compressor to dryer and the outlet valve. p. 76
- Remove silencers to prevent adsorbent dust blockage; wear respirator, goggles and hearing protection. p. 76Only during initial start or after adsorbent replacement
- Start compressor, wait for pressure, slowly open inlet valve. p. 76
- Inspect dryer connections for leaks and rectify. p. 76
- Activate dryer with Start button on controller. p. 76
- Run for several hours with outlet valve closed, then reinstall silencers. p. 76
- Gradually open external outlet valve, close bypass, open supply to PDP sensor. p. 76For dew‑point −70 °C, reaching operating mode may take more than 10 days.
Normal start
- Close external inlet valve and air supply to PDP sensor. p. 76
- Close external outlet valve to consumer. p. 76
- Start compressor and slowly open inlet valve. p. 76
- Turn on the dryer, slowly open the outlet valve. p. 76
- Close the bypass (if present) and open the supply to the PDP sensor. p. 77When restarting the compressor, close the inlet valve — high air velocity at start destroys the adsorbent.
Stop
- Open the bypass if needed so the consumer receives air. p. 77
- Close the external inlet and outlet valves. p. 77
- Let the dryer run without flow to vent pressure in the columns. p. 77
- Turn off the dryer. p. 77Do not pass compressed air through the dryer with power off — the adsorbent will be irreversibly damaged.
Regeneration nozzle replacement
- Stop the dryer with the Stop button, isolate all pressure sources and bleed the pressure. p. 78
- Open the top panel — nozzles are located on the upper manifold. p. 79
- Release the spline fittings on the brackets and remove the nozzle assembly with its couplings and tubing. p. 79
- Select a new nozzle based on working pressure according to the recommendation table. p. 79
- Install the assembly back into the corner fittings. p. 79
- Store spare nozzles in the bag inside the unit. p. 79
Maintenance intervals
| Item | When | Action | Manual |
|---|---|---|---|
| Controller display | Daily | Check messages and service warnings | p. 78 |
| Plan A | 6 months / 4000 h | Inspect wiring and connections, air leaks; replace inlet and outlet filter cartridges, purge silencer and regeneration silencer | p. 78 |
| Plan B | 1 year / 8000 h | Plan A + calibration or replacement of PDP dew‑point sensor | p. 78 |
| Plan C | 5 years / 40000 h | Plan B + replacement of adsorbent, purge valve, angle and solenoid regeneration valves | p. 78 |
| Seals | At each maintenance | Replace all removed O‑rings, seals and nylon washers; after maintenance reset service timer | p. 78 |
Faults and what to do
High dew‑point, PDP warning/alarm activeAdsorbent did not complete regenerationHigh dew‑point: silencers cloggedSilencers cloggedHigh dew‑point: filter drain not operatingFilter drain not operatingHigh dew‑point: excessive flow through dryerExcessive flow through dryerHigh dew‑point: low outlet pressureLow outlet pressureHigh dew‑point: high inlet temperatureHigh inlet temperatureFree water in dryerWater separator / filter drain before dryer not operatingExcessive noiseSilencer damaged or poorly securedLow outlet air flowToo much air diverted to purge
Technical specifications
| Nominal inlet pressure | 7 bar (typ.) | p. 82 |
|---|---|---|
| Inlet pressure, min./max. | 4 / 14 bar (typ.) | p. 82 |
| Inlet air temperature, min./max. | 2 / 50 °C | p. 82 |
| Ambient temperature, min./max. | 1 / 45 °C | p. 82 |
| Dew‑point under pressure (performance) | −20 / −40 / −70 °C | p. 82 |
| Default regeneration nozzle | at 7 bar | p. 14 |
| Adsorbent | Activated aluminum oxide | p. 83 |
| Regeneration flow rate (average, at −20 °C) | 16 % | p. 83 |
| Half‑cycle / regeneration / pressure build‑up (at −20 °C) | 87 s / 65 s / 20 s | p. 83 |
| Adsorbent service life | ≈ 5 years | p. 78 |
Spare parts and catalogue numbers
| Part | Number | Qty | Manual |
|---|---|---|---|
| Controller DC1 | 1 | p. 13 | |
| Adsorbent column, right / left | 2 | p. 13 | |
| Purge silencer (M1) | 1 | p. 14 | |
| Regeneration silencer (M2) | 1 | p. 14 | |
| Dust filter at outlet | 1 | p. 13 | |
| 3/2 valves left and right (V1, V2) | 2 | p. 14 | |
| Purge valve (V3) | 1 | p. 14 | |
| Regeneration valve (V4) | 1 | p. 14 | |
| Check valves left / right (V5, V6) | 2 | p. 14 | |
| Regeneration nozzle (N1) | 1 | p. 14 |
Source: manufacturer's manual “CD_plus_25-260_Instruction_Book_EN_Antwerp_2920711111”, 94 pages. Page numbers refer to the original. Check against the manual on board before work.
This page was translated automatically from the manual summary. Part numbers, codes and page numbers are as in the original.