Sequence shutdown switch

;NFPA86, UL, AGA & CGA machinery electrical standards (Gas Dryers)

;Available supply voltages of 208, 230, 460, 575/3/60 and 400/3/60

2-4 Options

Dewpoint Extend

The Dewpoint Extend option measures the temperature of the moist air as it is bled to the atmosphere after regeneration. After a period of time, the bleed temperature will rise. This condition, called "bed breakthrough" indicates that the bed is dry. At bed breakthrough, the bleed air temperature peaks between 350°F and 400°F.

The regeneration heaters turn off automatically on bed breakthrough for additional energy savings. A 550°F regeneration temperature will dry the desiccant beds sufficiently to produce process air dewpoint of -40°F. In a properly sized system, this ultra-low humidity level will be more than adequate to dry plastics to as little as .003% moisture.

Closed-Loop Regeneration

An optional regeneration closed-loop valve and heat exchanger can be used to close the regeneration loop during the cooling portion of the regeneration cycle. If this option is enabled on the dryer, air will be bled to the atmosphere until the heating portion of the regeneration cycle is finished. Then, the regeneration closed loop valve will direct air through a water-cooled heat exchanger and back into the regeneration loop (see Figure 2).

 

Figure 2: Closed Loop Regeneration

 

 

Regeneration

 

Regeneration

 

Blower

 

Blower

AD600-AD1500

 

AD600-AD1500

 

Dryer Flow Schematic

Dryer Valve

Dryer Flow Schematic

Dryer Valve

Regeneration Closed Loop

Regeneration

Regeneration Heating is

 

Cooling is Activated

Activated

 

Filter

Regeneration

 

 

 

Filter

 

Optional

 

Optional

 

Regeneration

 

Regeneration

Regeneration

Closed Loop

Regeneration

Closed Loop

Cooler

Cooler

Heaters

Heaters

 

 

 

Regenerarion

 

Regeneration

 

Exhaust

 

 

 

Exhaust

 

 

 

 

Optional

 

Optional

 

Regeneration

 

Regeneration

 

Closed Loop

 

Closed Loop

 

Valve

 

Valve

Left Desiccant

 

Left Desiccant

 

Large Dehumidifying Dryers

Functional Description

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Sterling 882.00295.00 specifications Options, Dewpoint Extend, Closed-Loop Regeneration

882.00295.00 specifications

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