Specifications

Unpacking/Application/Analysis

UNPACKING

ARROW REGENERATIVE AIR DRYERS ARE SHIPPED AS COMPLETELY ASSEMBLED PACK-

AGES FILLED WITH DESICCANT READY TO INSTALL.

VISUALLY CHECK THE DRYER FOR DAMAGE THAT MAY HAVE OCCURRED IN TRANSIT. IF

THERE IS EVIDENCE OF DAMAGE, IMMEDIATELY ENTER A CLAIM WITH THE CARRIER,

AND NOTIFY YOUR ARROW REPRESENTATIVE.

Standard operating pressure of your Arrow Dryer can range from 75 minimum to 150 maximum

PSIG. Check dryer label to verify maximum service pressure. Air available for your air usage will

vary with operating pressure.

The dryer should not be installed where compressed air and/or ambient temperature exceeds

120°F or drops below 32°F. Locate dryer to avoid extremes of heat and cold from other conditions.

Best results occur when dryer is located as close to point of use as practical. Where applicable,

dryer towers should be insulated to reduce heat loss. Avoid locating dryer outside or where it is

exposed to the elements.

Arrow dryers are sized according to air flow not pipe size. The dryer requires 10% to 15% of inlet

airflow (SCFM) for regeneration. The difference between the inlet and outlet flow is the amount of

purge air required. This air is purged to atmosphere and is not available for use downstream.

Make certain air supply to dryer meets your air demand plus purge air requirements.

APPLICATION CHECK AND ANALYSIS

READ CAREFULLY BEFORE ATTEMPTING TO INSTALL, OPERATE OR MAINTAIN YOUR

DRYER. PROTECT YOURSELF AND OTHERS BY OBSERVING ALL SAFETY

INFORMATION. FAILURE TO DO SO COULD RESULT IN PERSONAL INJURY AND/OR

PROPERTY DAMAGE. KEEP OWNER’S MANUAL FOR FUTURE REFERENCE.

TO ACHIEVE THE BEST DRYER PERFORMANCE, YOU SHOULD CAREFULLY CHECK THAT

THE DESIGN AND INSTALLATION REQUIREMENTS OUTLINED BELOW ARE SATISFIED.

Twin tower regenerative air dryers are the dryers of choice when traditional refrigerated dryers do not

provide sufficient air quality required for today’s applications. Arrow’s reliable ”RH” series of heatless

twin tower regenerative dryers normally produce –40°F and can optionally be as low as –100°F dew

points. The dryer utilizes activated alumina for efficient drying of compressed air and will operate

under extreme environmental conditions. Activated alumina is aluminum oxide that is highly porous

and exhibits tremendous surface area (350 sq. meters/gram). Activated alumina is resistant to ther-

mal shock and abrasion. It has a smooth, uniform ball size that prevents channeling of the air flow,

which maintains low bed velocities. This maintains air contact time for efficient moisture removal and

minimal pressure drop. Arrow’s printed circuit board dryer controls are housed in a NEMA 4X

rated enclosure and provide control of pneumatically piloted valves chosen for long life

and high air flow.

INTRODUCTION TO HEATLESS REGENERATIVE DRYING