Heatless Regenerative Air dryers are labeled “Heatless” because no external heat source required for regeneration. The system utilizes retained heat of adsorption generated from the previous adsorption cycle. Great Lakes Series GPS Air Dryers automatically deliver a standard -40F pres-sure dewpoint. The model series can optionally attain dewpoint’s as low as -100F. The system is easily maintain-able and is extremely reliable in both dewpoint suppres-sion and mechanical reliability.

The GPS Series is most economical in systems with moderate air vol-ume, because of low operating costs and original equipment pur-chase. Systems with high air volumes tend to have prohibitive operat-ing costs, due to the required 14% purge rate.

Sequence of Operation

Compressed air laded with moisture vapor enters the system throught the right inlet valve and proceeds to enter the desiccant bed through the stainless steel diffuser screen. The air flows up from the bottom of the tank to the top allowing separated and condensed liquit to remain at the bottom of the vessel not contaminating the rest of the desiccant. The dehydrated compressed air then exits the right vessel through the top stainless steel

the desiccant bed through the stainless steel diffuser screen. The air flows up from the bottom of the tank to the top allowing separated and condensed liquit to remain at the bottom of the vessel not contaminating the rest of the desiccant. The dehydrated compressed air then exits the right vessel through the top stainless steel diffuser screen, and past the outlet check-valve. A per-centage of the dry air is direct-ed and metered to the left des-iccant bed for regeneration. The adsorbent purge air enters the desiccant bed from the top and flows down collecting moisture from the desic-cant. The now moisture laden purge air exits the system through the purge valve and muffler. Several seconds before the cycle nears completion the purge valve closes and allows the regeneration vessel to equalize pressure with the online tower. The cycle completes and the inlet valves invert continuing the cycle.