The Parker PRD Series refrigeration air dryer increases efficiency and productivity and are ideally suited for general purpose oil free pneumatic air treatment applications. They typically provide pressure dew points of 35°F (1.7°C) to 50°F (10°C) pressure dew point (pdp).  Refrigeration air dryers work by cooling the air, so are limited to positive pressure dew point ratings to prevent freezing of the condensed liquid. Refrigeration dryers use a set of heat exchangers or a single heat exchanger (with chambers) first to pre-cool the air; second to refrigerate the air to condense out moisture vapor; and last to re-heat the air to prevent pipe sweating downstream particularly in humid conditions.

Non-Cycling (Direct Expansion) dryers are a type of dryer where the compressed air and the refrigerant come into direct contact via the heat exchanger. While reliable and simple to use, they generally require that the unit continues to run regardless of actual compressed air flow through the dryer. Cycling dryers that utilize a thermal mass as the means to absorb the heat from the compressed air. By chilling a thermal mass, a refrigerant compressor may turn off in times of low demand thereby saving energy by shutting off the refrigerant compressor. 

Markets
• General Industrial
• Factory Automation

Features/Benefits
• Non-Cycling
• Zero air loss drain
• 3-Stage Dew point Indicator

Applications
• General Assembly
• General Pneumatic

Function Refrigeration Dryer
• Pipe Size (in.): 1/2 NPT-F | 3/4 NPT-F | 1-1/2 NPT-F
• Primary Voltage: (V)115 | 230 | 460
• Flow SCFM 10 to 250
• Flow m³/hr. 17 to 425
• Ambient Temperature Range: 41° to 122°F or  5° to 50°C
• Maximum Inlet Temperature: 149°F or 65°C
• Maximum Pressure (psig): 232 (10 - 175 SCFM) | 203 (200 - 250 SCFM)
• Maximum Pressure (bar): 16 (17 -297 m³/hr.) | 14 (425 m³/hr.)
• Pressure drop (psi) @ rated flow Less than 5
• Pressure drop (bar) @ rated flow Less than .35
• Refrigerant: R134A | R407C
• Weight: 42 to 287lb or 19 to 130kg
• Features Non-Cycling;  Zero air loss drain; 3-Stage Dew point Indicator; On / Off Switch; PlusPak 3-in-1 aluminum design heat exchanger (patent pending)