CDR Refrigerated Compressed Air Dryers

CDR Series

Performance through design

Saturated inlet air enters air to air heat exchanger and is precooled by outgoing chilled air, which is simultaneously reheated as it leaves the dryer. Inlet air is further cooled by the refrigeration system. As the air is cooled, water vapor condenses into liquid droplets. This liquid along with particles down to 3 micron are removed by the separator. Condensation is then discharged from the dryer by a zero air loss automatic drain.

FS-Curtis CDR Series models CDR 200 and larger include an Energy Management Control Panel.

CDR SERIES STANDARD FEATURES

Models CDR100 to 150

• On/off switch, power on light, and dew point temperature indicator - alerts operator to overload condition or refrigeration system fault
• CF9 Series filter/separator comes standard
• (Optional) CF5 Series .01 micron coalescing oil removal filter

Models CDR200 to 3000 come with the emm™ Energy Management Monitor

• This advanced 24 volt electronic package has many user friendly interfaces which can save energy, automate service intervals, communicate in ten languages, and add functionality
• Energy-saving “schedule mode” allows compressed air users with one or two- shift operations to schedule the dryer to turn on and off in accordance with their work schedule
• Automatic service intervals can be set for predictive maintenance schedules: to ensure that the condenser on air-cooled units is maintained dust-free and to advise the replacement of the standard CF9 Series separator/filter element every 12 months, and the optional CF5 Series coalescing oil removal filter
• Operator interface with read-outs comes standard in ten languages (English, German, French, Spanish, Italian, Polish, Danish, Dutch, Norwegian and Finnish): Read-outs include current time, operating status such as manual or scheduled running modes, hours to service and total operating hours
• Functionality features include a drain push-to-test button, power-on and
compressor-on lights, an operator alert light which indicates that service is required or that there is a refrigeration system or drain fault, dew point
temperature indicator
• Remote monitoring of the emm™, from your computer, possible through the RS-232 communication port
• Standard NO and NC voltage-free alarm contacts and RS-232 communication port
• Fault condition diagnostics with user-friendly text display
• CF9 Series filter/separator comes standard
• (Optional) CF5 Series .01 micron coalescing oil removal filter

HOW IT WORKS
A) Compressed air, saturated with water vapor, enters the air-to-air heat exchanger.
B) Inlet air is precooled by the outgoing chilled air, and then directed to the air-to-refrigerant (evaporator) heat exchanger.
C) Further cooling takes place in the refrigeration system.
D) As the air is cooled, water vapor condenses into liquid droplets and are removed by the filter/separator.
E) Liquid is discharged from the dryer by an automatic drain.
F) Air then goes through an oil removal filter (optional) and dry, oil-free, chilled air returns through the air-to-air heat exchanger where it is reheated before exiting the dryer.

CAPACITY CORRECTION FACTORS
To adjust dryer capacity for conditions other than rated, use Correction Factors.
Example: What is the capacity of a 1,000 scfm model when the compressed air at the inlet to the dryer is 150 psig and 100ºF (38ºC), and the ambient temperature is 90ºF (32ºC)?

Answer: 2,000 scfm (rated flow from Specifications Table) x 1.13 (correction factor for inlet temperature and pressure from Table 1) x 1.06 (correction factor for ambient temperature from Table 2) = 2,396 scfm

CDR Series Dryers provide an extremely consistent level of drying over a wide range of operating conditions. Downstream air lines and pneumatic equipment are kept free of troublesome liquid water allowing for extended component service life and increased productivity.