Aircel AHLD Series

Dimensions & Specifications

Search below based on your specific needs and click on a model to order, view pricing, or download product information. If you have questions on how to properly select a compressed air dryer, contact our knowledgeable customer service toll-free: 866-650-1937 or send us an email request. Pricing includes mounted prefilter and afterfilter, ASME code stamped filter housing, differential pressure gauge, automatic drain valve and initial filter element.

¹ Capacity rated in accordance with CAGI ADF 200 @ 100 psig, 100°F inlet, 100° ambient, and a PDP of -40°F.
Ambient air temperature: 38°-125°F, inlet air temperature: 40-125°F, operating pressure: 60-225 psig.
Standard power supply: 110V/60 Hz, other options available.

If you have questions on how to properly select a compressed air dryer, contact our knowledgeable customer service toll-free: 866-650-1937 or send us an email request.

Use our Drying Sizing Tool below to find the dryer you need based on your system specifications.

How to Size a AHLD

To Size the Dryer Capacity for Actual Conditions

Adjusted Capacity = scfm x C1 x C2

To calculate the capacity of a given dryer based on non-standard operating conditions, multiply the standard capacity by the appropriate correction factor(s).

EXAMPLE: Dryer Model: AHLD-100
Standard Capacity: 100 scfm
Actual Operating Conditions: 120 psig system pressure: C1 = 1.18
100°F ambient temperature: C2 = 1.0
Adjusted Capacity = 100 scfm x 1.18 x 1.0 = 118 scfm

To Select the Dryer Model for Actual Conditions

Adjusted Capacity = scfm/C1/C2

To choose a dryer based on a given flow at non-standard operating conditions, divide the given flow by the appropriate correction factor(s).

EXAMPLE: Given Flow: 350 scfm
Actual Operating Conditions: 120 psig system pressure: C1 = 1.18
100°F ambient temperature: C2 = 1.0
Adjusted Capacity = 350 scfm / 1.18 / 1.0 = 296.6 scfm

Selected Dryer Model: AHLD-300

Capacity Correction Factors

The Compressed Air and Gas Institute (CAGI) has developed standards to protect users of compressed air & gas equipment ADF 200 is the current standard for desiccant compressed air dryers. ADF 200 specifies the dryers performance to be rated at -40°F pressure dew point, 100°F inlet temperature, 100°F ambient temperature, and 100 psig system pressure. To adjust the dryer capacity from these "CAGI conditions" to your specific application, please use the correction factors below for differing inlet air temperatures (C1) and system pressures (C2).

*For inlet temperature above 100°F, molecular sieve desiccant is required.

The Aircel AHLD Heatless Regenerative Desiccant Air Dryer

Regenerative compressed air dryers use desiccant to adsorb water vapor from the compressed airstream. In the twin tower design one tower dries the air from the compressor while the desiccant in the other tower is being regenerated to provide continuous operation. These dryers are typically referred to as "heatless" or "heated". Heatless dryers do not use any source of heat for regeneration other than the heat given off during the drying phase. This is known as the "Heat of Adsorption".

The Aircel AHLD Series Dryers (80 - 5,000 scfm) are based on the traditional twin tower concept. Regeneration is achieved by using a partial stream of the dried air, expanded to atmosphere, and directed through the off-line desiccant bed. In addition to standard designs Aircel has the experience, engineering and manufacturing capabilities to design dryer systems of any size including pressures up to 10,000 PSIG and volume flows up to 20,000 SCFM. Designs that meet NEMA ratings of all types or other specialty industry codes such as "pharmaceutical" or "offshore" are easily accommodated.

Features

• Pricing includes mounted prefilter and afterfilter, ASME code stamped filter housing, differential pressure gauge, automatic drain valve and initial filter element.
• The auxiliary-piloted, two-way, angle-body piston valve carries a 10-year warranty on 80 to 600 scfm models.
• Tower pressure relief valves.
• Purge adjustment valve to control purge flow.
• Purge flow indicator.
• Purge exhaust mufflers for quiet operation.
• Tower pressure gauges.
• Stainless steel desiccant supports and air diffusers to prevent channeling.
• Adjustable (5 min.,10 min.) microprocessor controlled sequence module.
• Controlled repressurization.
• Reliable non-lubricated high-performance butterfly valve (≥750 scfm models).
• Fail-safe design: failure of power and/or pilot air causes the purge exhaust valves to close.
• Control pilot air filter.
• Desiccant towers are designed and fabricated according to ASME code (6" vessels and larger).
• Desiccant fill and drain ports for ease of desiccant replacement.
• High quality, soft seat, check valves.
• Tower operating status lights.
• ON/OFF switch and power ON light.

Energy-Saver Demand Cycle Control

The optional energy-saver demand cycle control reduces purge air consumption and optimizes dryer performance by monitoring the actual dew point at the outlet of the dryer.

• A.C.T. (Advanced Capacitive Transducer)
• Adjustable Demand Cycle Control set point
• Range: -130°C to +20°C dew point
• Accuracy: +/- 2°C
• Repeatability: +/- 0.5°C
• Alarm: SPDT, 1A @ 120 VAC
• Output: 0-10 VDC or 4-20 mA
• Enclosure: NEMA 4

Microprocessor control panel with built-in timing module indicates sequence of operation for both towers. Improves reliability and performance.

Dryer sequence indicators for ease of operation and troubleshooting listed below:

• Power ON/OFF switch and light
• Demand cycle ON/OFF switch and light
• Left tower drying light
• Right tower drying light
• Left tower regenerating light
• Right tower regenerating light
• Repressurization lights
• Common alarm dry contact
• Switching valve failure alarm (optional)
• Microprocessor failure alarm (optional)
• High humidity alarm (optional)

This auxiliary-piloted, two-way, angle-body piston valve features an extra-stable shaftwith oversized bearings for extended service life and a pop-up button providing a visual indication of the valve position. They have been tested to over one million cycles and carry a 10-yearwarranty (80- 600 scfmmodels).*

* Refer towarrantymanual for details.

Optional Features

• NEMA 4/12 electrical construction.
• NEMA 7 (explosion proof) electrical construction.
• -100°F pressure dew point.
• Failure to shift alarm.
• High inlet temperature alarm.
• Dew point* monitor.
• Demand cycle control with dew point monitor.
• Pre-piped filters and by-pass valve packages.
• Visual moisture indicator.
• High inlet pressure up to 10,000 psig.
• All-pneumatic control package (no electricity required).
• Programmable logic controller (PLC).

* According to ISA. "The temperature referred to at a specific pressure at which water vapor condenses" is called dew point.

How The AHLD Series Works

Saturated compressed is filtered by the high efficiency coalescing prefilter (recommended option) before entering the dryer. Our up flow drying design with counter-current regeneration provides peak performance with the lowest possible energy consumption. The air is dried as it passes up through the desiccant bed of one tower. Clean dry air is available at the outlet after passing through the outlet filter (recommended option).

Regeneration of the saturated desiccant (off-line bed) is accomplished using a small portion of the dried air. The dry air is passed through the wet desiccant bed at near atmospheric pressure (purge air) which removes moisture vapor from the desiccant surface. The tower being regenerated will be repressurized at the end of the regeneration cycle prior to switchover.

Available Options

Contact our customer service team by calling toll-free 866-650-1937 or email sales@ecompressedair.com for more information about the AHLD dryer or for customized options and quotes.

Replacement Parts & Service

eCompressedair has partnered with Aircel which gives our customers direct distributor discounted pricing and access to the entire Aircel product line.

Purchasing an Aircel dryer from eCompressedair gives you access to factory-direct replacement parts, kits and maintenance information for all Aircel dryers. Contact our customer service team by calling toll-free 866-650-1937 or email sales@ecompressedair.com for more information about the AHLD dryer replacement parts, kits or maintenance information.

Aircel AHLD Heatless Regenerative Desiccant Air Dryer Series

Brochure (pdf)

Contact our customer service team by calling toll-free 866-650-1937 or email sales@ecompressedair.com for more information about the AHLD dryer or for customized options and quotes.