KAD-0A Refrigerated Air Dryer

Moisture is the single most common cause of compressed air system failures — corroded pipes, ruined pneumatic tools, contaminated products, and frozen instrumentation lines. The KAD-20A Refrigerated Air Dryer removes water vapor from compressed air by cooling it below its dew point, condensing moisture into liquid that is then automatically drained away. The result is clean, dry air at a stable 3°C pressure dew point — dry enough for the vast majority of industrial and commercial applications.

What Is Pressure Dew Point and Why Does It Matter?

Pressure dew point (PDP) is the temperature at which water vapor in compressed air begins to condense into liquid, measured at the system's operating pressure. Atmospheric dew point and pressure dew point are very different: air at 25°C with 80% relative humidity has an atmospheric dew point of about 21°C, but when compressed to 7 bar, that same moisture content produces a pressure dew point around +3°C. If your piping or equipment drops below this temperature downstream, condensation forms — causing rust, product spoilage, and instrument failure.

A 3°C PDP means your compressed air system can operate in ambient temperatures down to 3°C without any condensation forming in pipes or at points of use. For most factory environments, workshops, and commercial applications, this is the ideal balance of performance and energy efficiency.

Why Do I Need a Dryer If My Compressor Has an Aftercooler?

An aftercooler reduces air temperature and removes some moisture, but it only cools the air to within 8–15°C of ambient temperature. On a 35°C day, your aftercooler delivers air at 43–50°C — far above the dew point threshold. Water will condense as soon as the air cools in your piping system. A refrigerated dryer like the KAD-20A takes this process further, actively cooling the air to a fixed 3°C PDP regardless of ambient conditions, ensuring consistent dry air year-round.

How Does the Refrigeration Cycle Work in the KAD-20A?

The KAD-20A uses a vapor-compression refrigeration cycle with an energy-efficient R-134a refrigerant system. Warm, moist compressed air enters the air-to-refrigerant heat exchanger, where it is cooled to 3°C. The condensed water is separated in an integrated centrifugal separator and discharged through an automatic zero-loss drain. The cold, dry air then passes through an air-to-air reheater, where it absorbs heat from the incoming warm air — this serves two purposes: it pre-cools the incoming air (saving energy) and raises the outlet air temperature to prevent external condensation on downstream piping.

What Maintenance Does the KAD-20A Require?

Refrigerated dryers are among the lowest-maintenance components in a compressed air system. The KAD-20A requires no desiccant replacement, no regeneration cycling, and no scheduled element changes. Routine maintenance is limited to:

• Cleaning the condenser coil every 6 months (compressed air blow-off) to maintain heat transfer efficiency
• Checking the automatic drain function monthly to ensure condensate is being properly expelled
• Inspecting the refrigerant pressure annually (sealed system, typically no top-up needed for 5+ years)
• Replacing the inlet/outlet air filters every 8,000 hours if integrated

What Are the Technical Specifications?

The KAD-20A's compact design (520 × 420 × 680 mm, 45 kg) allows installation in tight spaces, and the integrated bypass valve allows the dryer to be isolated for maintenance without shutting down the entire compressed air system. Whether protecting pneumatic tools in a workshop or ensuring product quality on a packaging line, the KAD-20A delivers reliable moisture removal with minimal energy cost and zero operator intervention.