A non-cycling UL refrigerated air dryer is a type of compressed air dryer that utilizes a refrigeration system to remove moisture from compressed air. The "non-cycling" refers to the operation of the refrigeration system, which remains active continuously, regardless of the compressed air demand.

Here are some key features and characteristics of a non-cycling UL refrigerated air dryer:

1. UL Certification: UL stands for Underwriters Laboratories, an independent safety certification organization. A non-cycling UL refrigerated air dryer is certified by UL, ensuring it meets specific safety and performance standards.

2. Refrigeration System: The dryer uses a refrigeration system, typically with a compressor, condenser, evaporator, and expansion valve, to cool down the compressed air and remove moisture.

3. Continuous Operation: Unlike cycling refrigerated dryers that turn on and off based on the air demand, non-cycling dryers operate continuously regardless of the compressed air usage. This ensures consistent moisture removal and reliable performance.

4. Consistent Dew Point: The non-cycling dryer maintains a consistent dew point, which is the temperature at which moisture in the air begins to condense. This helps to prevent condensation and related issues downstream in the compressed air system.

5. Energy Efficiency: Non-cycling dryers are known for their energy efficiency because they don't cycle on and off. However, they may consume more energy than cycling dryers during periods of low compressed air demand.

6. Suitable for Stable Air Demand: Non-cycling dryers are ideal for applications with a relatively stable compressed air demand. They are commonly used in industries such as manufacturing, automotive, and general industrial processes.

7. Sizing and Capacity: Non-cycling UL refrigerated air dryers come in various sizes and capacities to accommodate different compressed air system requirements. It's important to properly size the dryer based on factors like air flow rate, operating pressure, and ambient conditions.

When selecting a non-cycling UL refrigerated air dryer, it's advisable to consider the specific requirements of your compressed air system, including the desired dew point, operating conditions, and energy efficiency needs. Consulting with a compressed air system specialist or the manufacturer can help ensure the dryer meets your specific application requirements.