Page 1: Table Of Contents
Great Lakes Air Products 1515 S. Newburgh Road Westland, MI 48186 PH: 734-326-7080 www.glair.com COMPRESSED AIR DRYER INSTRUCTION MANUAL GPS-SERIES HEATLESS REGENERATIVE DESICCANT DRYERS Contents Introduction General Safety Information Proper use of Dryer Receiving Equipment Installation Location Inlet Conditions Pre-Filtration...
Page 2: Introduction
Reliability in materials and quality assurance are incorporated in our genuine replacement parts. Your authorized Great Lakes Air Products Dryer distributor offers all the backup and reassurance you’ll need. Our network of authorized distributors provides the finest product support in the air compressor industry.
Page 3: Proper Use Of Dryer
This dryer is supplied tested and assembled however some components on larger units have been removed and attached to the skid independently, to avoid any damage during shipping. On models GPS-500 and larger the desiccant material is shipped on a separate skid from the dryer for installation instructions see...
Page 4: Pre-Filtration
PRE-FILTRATION As all regenerative desiccant dryers are designed to remove only water vapor, any possibility of liquid water carryover to the desiccant dryer must be avoided. Coalescing pre-filtration will eliminate the carryover of droplets, aerosols, and compressor lubricant liquids. Proper filtration will not only enhance the dew point suppression capability of the dryer, but will also add years of life to the desiccant by preventing fouling of the desiccant caused by compressor lubricants.
Page 5: Optional Backpressure Regulator
DESICCANT LOADING PROCEDURES Models GPS-500 and larger require field loading of the desiccant material. Desiccant is not shipped in the dryer vessels to avoid damage to the desiccant support screens and premature desiccant breakdown.
Page 6: Operation
OPERATION The operation of a GPS dryer is fully automated with all sequencing and function controlled by an automatic timing module programmable controller. Wet and dirty compressed air discharged from the compressor enters aftercooler, where compressed air temperature is reduced to near ambient.
Page 7: Dewpoint Demand Controller
DEWPOINT DEMAND CONTROLLER The Dewpoint Demand Controller is an option designed to limit energy consumption to the minimum required for optimum dryer performance. The option works off the premise that not all compressed air conditions are stable and continuous. Each desiccant tower is designed to adsorb the moisture load of full rated flow and rated conditions for 5 minutes.
Page 8: Sequence Controller
SEQUENCE CONTROLLER Time cycles are part of the equipment design that have been accurately set in the factory and should not be field adjusted. Timing changes are possible for custom applications but always consult the factory prior to changes. The following are the standard time cycles for your equipment. 5 Minutes or indefinite period with the Demand Cycle Controller Drying Each Tower option.
Page 9: Maintenance
Always leave adequate room above the desiccant bed to permit some bed motion and expansion during dryer operation. Be certain to only install the approved activated alumina that your Great Lakes Air Products representative can provide; it excels with respect to dew point suppression capability and attrition resistance.
Page 10: Troubleshooting Guide Quick Reference
TROUBLESHOOTING GUIDE - QUICK REFRENCE Please read the entire troubleshooting section of the manual before proceeding with any repairs or modifications. Several topics are addressed at several points in the manual and understanding them all before you proceed will give you a much better understanding of the entire process.
Page 11 Ambient & Air Inlet The capacity of a compressed air dryer is a combination of four operating conditions, flow, pressure, temperature, and saturation. These parameters are commonly specified as SCFM at 100 PSIG, 100°F, and 100% saturated. When a system deviates from these standard parameters, the load on the compressed air dryer changes.
Page 12 Intermittent Cycle Problems There are three probable reasons that a system cycle will fail intermittently. The first possible reason is the timer control card. This fault is very easy to verify with the help of a voltmeter. Use the meter to match the control cycle to electrical outputs associated with the output diaphragm on page 9 of this manual.
Page 13 Dewpoint Demand Controller (Optional) The dewpoint demand system consists of three components. First, a probe that reads system dewpoint and transmits a 4-20 ma signal to the second component, a digital display that interprets and displays it in °F pressure Dewpoint. The third component is the 24V DC power supply that supplies power to the probe for loop power signal and the probe’s auto calibration routine.
Page 14: Warranty
Great Lakes Air Products will not be responsible for the following items; component failure due to improper or fluctuating voltage, maintenance items such as control air filter, muffler elements, dewpoint probes, external wear items such as insulation or the exterior finish, desiccant that has been contaminated, freight damages and or any parts not original to the dryer.

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