Moisture is the quiet enemy of a compressed air system. Water vapor in the tank will rust the inside, carry scale downstream, and make your tools stutter. In the compressors blowers air treatment space, a refrigerated dryer is the component that removes that moisture before it reaches the work. The Schulz ADS 20 is a refrigerated compressed air dryer intended for this job, and the real question is whether its fixed rating fits the air demand of your compressor.
Quick verdict
The ADS 20 is a non-cycling refrigerated dryer, and at USD 1,381.80, the price positions it as a serious tool for a small shop air system. It is a specific component with a defined operating envelope, so it works best when the compressor and the dryer are sized to each other.
Who it suits
Choose this dryer for a compressed air system that runs a 5 HP compressor or a smaller unit and needs around 20 CFM at 100 PSI. It also runs on 115V, so it fits shops where a standard voltage outlet is already available for the dryer.
What stands out
The integrated electronic controller with digital display is the strongest feature here. It shows temperature and dew point, controls the automatic drain on a timer, and reads a temperature probe to regulate the condenser fan. The unit also includes a quick-disconnect automatic drain valve and a high-efficiency refrigeration compressor, and it accepts up to 220 PSI input pressure. For a small-system dryer, that controller turns monitoring into a glance at a screen.
Meaningful trade-offs
The main trade-off is that the dryer is non-cycling, which means it is engineered for continuous moisture removal rather than on/off cycling. That aligns with steady shop use, but it also means the design is what it is. You are also paying USD 1,381.80 for one component, so the dryer needs to earn that cost by being matched correctly to the compressor.
Bottom line
The Schulz ADS 20 is a credible refrigerated dryer when the compressor it serves is sized to its capacity. It brings the monitoring and drain automation that keep moisture out of the line, and if the capacity matches your air demand, this unit is a solid fit.
#### Schulz ADS 20 Refrigerated Compressed Air Dryer - 20 CFM, 115V
The reason to lean toward the ADS 20 is the integrated electronic controller and digital display: you get temperature and dew point readings, automatic drain timing, and condenser fan regulation from a temperature probe all in one package. The limiting detail is the airflow ceiling at 100 PSI. That is the operating point the dryer is sized for, so your compressor and downstream equipment have to stay within that airflow. If they do, the unit should keep the line dry; if they do not, the dryer is outside its intended operating point.
