Effectively remove air moisture with a refrigerated dryer

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A refrigerated dryer is suitable for nearly all pneumatic industrial applications. These machines can achieve a pressure dew point (PDP) between +2˚C to +10˚C.

With this, it's important to note that PDP is not the same as the atmospheric dew point. It strictly refers to compressed air water content. Also, using only a filter to achieve dry air isn't an effective solution.

Depending on your application, you may need to meet certain PDP levels. While making sure quality standards are met, air compressor dryers are essential for avoiding corrosion, rust, contaminants, and bacteria within your system.

While refrigerated "fridge" dryers are typically the cheapest option, they're sufficient for protecting air compressor components while increasing the lifespan of your system. Additionally, you'll find features like PDP monitoring on new equipment.

How a refrigerated dryer protects equipment

During the compression process, the air becomes hot and the moisture in it vaporizes. As the air starts to cool down, the water vapor condenses into liquid form. If condensation forms and stays inside an air compressor, you risk the issues mentioned above.

Fridge dryers cool the compressed air, which turn condenses moisture content. This process makes it easy to remove condensate from compressed air. Afterwards, the dry air passes through an air-to-heat exchanger for use.

With moisture discharged from your system, the risk factors mentioned are averted, and you'll operate at peak performance.

Operating a refrigerated dryer

These machines use refrigerants to cool the hot air. Compressed air passes through the dryer where air condenses into water for draining (as mentioned above). This equipment is pretty straightforward and easy to use.

You'll find features like intelligent drain discharge on some models. With electronic sensors, this component removes condensate without wasting any compressed air. There's also optional filter support and features to reduce installation costs.

To be effective, the relative humidity of the compressed air should be below 50%. Helping you monitor the drying process, there's optional PDP indicators. These devices come with a PDP alarm, measure dew point, and indicate fan status.

That being said, setup and maintenance are fairly simple and straightforward for refrigerated dryers. We've designed easy to use, long-lasting machines to minimize operational costs as much as possible.


When researching refrigerated dryers, you'll likely come across non-cycling and cycling models. The main difference between these two types is how the motor runs.

Non-cycling dryers, offered by Mark, are the most budget friendly option. They run continuously, regardless of air load demand. This equipment is fairly standard and straightforward.

Environmentally friendly gasses

Since these dryers use refrigerant gasses, it's worth pointing out their environmental impact. If this is an area of concerns, our MDX dryer uses environmentally-friendly R513A, R410A, and R452A gas with no impact on the ozone layer.

Proper drainage

If your refrigerated dryer is connected to an oil-injected air compressor, you'll need to use an oil-water separator for discharge. It's important to dispose of oil properly, especially with environmental regulations becoming stricter.

You'll also want to be considerate when disposing of condensate. When water is removed from an air compressor, it usually contains tiny contaminants, including oil. It's important to follow proper protocols, especially since most of this material is unseen to the naked eye.

Never drain dirty condensate directly onto your floor or in a plastic container. By following these guidelines, you'll ensure your business is following proper protocols.

Choosing a refrigerated dryer for your air compressor

With our compressed air refrigerated dryers, you'll benefit from easy installation and high reliability. These machines are well worth the investment for protecting your air compressor equipment while meeting quality standards.

When evaluating machines, you'll want to consider installation, reliability, PDP, and quality components. It's also important to find the most energy efficient solution.

If you're ready to explore Mark's offerings, feel free to get in touch. Our team will walk you through various models to meet your needs. We look forward to hearing from you.

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