Regenerative desiccant compressed air dryers require purge air to strip moisture from the desiccant beds. These dryers use a series of valves to control the flow of compressed air through the dryer. A common failure in older dryers is leaking or purging air from a tower that should not be venting any air. The telltale sign of this problem is a drying tower that doesn’t hold full pressure. Here are some steps you should take if this is happening.

• Turn off power to the dryer.In many makes and models, both towers will pressurize.
• If air is leaking from either exhaust muffler, you probably have a bad purge valve.Repair or replace the purge valve(s).
• Also check the solenoid exhaust ports.While in power-off mode, no air should be bleeding from the control solenoids.
• If any air is exhausting from one or more solenoids, replace the leaky valve.

Also, remember to replace exhaust mufflers on a regular basis and all associated filters. These simple steps will help keep your regenerative desiccant dryer running for a long time.

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