CD⁺ 25-1400 Desiccant Air Dryers

Compressed air entering the air net is always 100% saturated. When it cools, this moisture will condense, causing damage to your air system and finished products. Removing moisture from compressed air with a pressure dewpoint (PDP) as low as
-70°C/-100°F, Atlas Copco desiccant dryers eliminate system failures, production downtime and costly repairs.

Highest reliability

•A constant pressure dewpoint down to -70°C/-100°F at 100% load conditions.
•A proven, durable design for the switching valves significantly improves the dryer lifetime.
•An advanced control and monitoring system ensures production efficiency.

Maximum energy efficiency

Atlas Copco’s desiccant dryers incorporate energy-saving features to cut your carbon footprint. A low pressure drop below
0.2 bar/2.9 psi drives down energy costs. Dewpoint sensing and control adapts the energy consumption to the real load of the dryer. An adjustable PDP setpoint enables you to adapt the dryer to your actual needs.

Easy installation and long maintenance intervals

The dryers have a small footprint thanks to an innovative all-in-one design. Delivered ready for use, installation is straightforward, minimizing costly production downtime.

Assuring your peace of mind

All internal components are easily accessible to facilitate maintenance. The use of high-grade desiccant and durable valves extends maintenance intervals beyond the standard three years

①Wet compressed air flows upward through the desiccant which adsorbs the moisture, from bottom to top.

The regeneration process

②Dry air from the outlet of the drying tower is expanded to atmospheric pressure and sent through the saturated desiccant, forcing the adsorbed moisture out.

③After desorption, the blow-off valve is closed and the vessel is re-pressurized.

Switching

④After regeneration, the functions of both towers are switched.

•Pre-filter(s) protect desiccant against oil contamination, increasing desiccant lifetime.
•After-filter protects network against desiccant dust, avoiding network contamination.
•Can be mounted directly on the inlet and outlet of the dryer, for low pressure drop.
•Easy to assemble and maintain as no extra piping or filter connections are required.

②High-quality valve block with few moving parts

Designed to minimize pressure drop and increase reliability.

③Overfilled and spring-loaded high-performance desiccant cartridges

•Pressure dewpoint of -40°C/-40°F as standard (-70°C/-100°F as option).
•Filter mat increases silencer lifetime by preventing dust exiting during regeneration.
•Overfilled cartridges protect against desiccant ageing and overflow peak.
•Horizontal operation possible.

④Up-sized silencers with integrated safety valves

Advanced mufflers avoid back-pressure, increase purge efficiency, offer protection in case of clogging via the integrated safety valve, and reduce noise level during blow-off.

⑤Advanced control and monitoring system

• Timer control variant cycles defined to reach PDP target even at 100% load.
• Auto restart after power failure function with cycle status memory.
• Full status annunciation on LEDs, display and pressure gauges.
• Remote alarm and remote control.
• Purge Saver contact: the dryer can freeze purge cycle in case of unload/stop signal.
• All controls are protected from water and dust thanks to the IP54 cubicle.

⑥Dewpoint Dependent Switching (optional)

• Real PDP monitoring (hygrometer).
• PDP display on controller (and alarm).
• The dryer will only switch to the next tower when the desiccant is saturated (based on PDP input). During that period, the dryer consumes no purge.

Advanced mufflers avoid back-pressure, increase purge efficiency, offer protection in case of clogging via the integrated safety valve, and reduce noise level during blow-off.

Filters
•Pre-filter(s) protect desiccant against oil contamination, increasing desiccant lifetime.
•After-filter protects network against desiccant dust, avoiding network contamination.
•Can be mounted directly on the inlet and outlet of the dryer, for low pressure drop.
•Easy to assemble and maintain as no extra piping or filter connections are required.

High-quality desiccant
•Pressure dewpoint of -40°C/-40°F as standard (-70°C/-100°F as option).
•Up to 30% extra desiccant overfill to deliver consistent performance even in harsh conditions such as high temperatures and temporary overloads.

Robust and compact design
•Standard frame, including forklift slots and lifting eyes for easy handling.
•Wide vessels ensure a low air speed and a longer contact time.
•Flanges connecting vessels are integrated into the top and bottom shells, lowering the total unit height.

②Dewpoint Dependent Switching

• Real PDP monitoring (hygrometer).
• PDP display on controller (and alarm).
• The dryer will only switch to the next tower when the desiccant is saturated (based on PDP input). During that period, the dryer consumes no purge.

③Galvanized piping with flanged connections

• Flanged piping simplifies maintenance and minimizes the chance of leakage.
• Pipe sizing is optimized to ensure a low pressure drop, resulting in energy savings.

④Advanced control and monitoring system

• Fitted inside a real IP54 cubicle for easy cabling and safety.
• Monitors all parameters to ensure maximum reliability of the installation.

⑤Stainless steel valves

Fully stainless steel high-performance butterfly valves with actuators ensure long lifetime.