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Select Aire (SA) systemsare dual refrigerationcircuit dehumidifiers. Systems remove between55 and 340 pounds ofmoisture per hour. Refrigeration circuitsconsist of scrollcompressors for highperformance and long life. Models feature 8-rowevaporator coils for highmoisture removal capacity. SA systems include anexclusive exhaust air heatrecovery system andpatented air flowbalancing. SA’s dual refrigerationcircuit design allowsstaging to minimizeenergy consumption andoptimize energy recovery.Installation and Operation Manual
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DANGERONLY TRAINED, QUALIFIED PERSONNEL SHOULD INSTALL AND/OR SERVICEDESERT AIRE EQUIPMENT. SERIOUS INJURY, DEATH AND PROPERTY DAMAGE CANRESULT FROM IMPROPER INSTALLATION/SERVICE OF THIS EQUIPMENT. HIGH VOLTAGEELECTRICAL COMPONENTS AND REFRIGERANT UNDER PRESSURE ARE PRESENT.Desert AireDehumidification EquipmentStandard Limited WarrantyDesert Aire warrants the dehumidifying unit to be free from defects in materials and workmanship subject to the terms,conditions and limitations stated herein.TERMSDesert Aire warrants all components (except as noted) for a period of two (2) years from the date of shipment. Thiswarranty shall be limited to the supply of new or rebuilt parts for the part which has failed because ofdefects in workmanship or material, and does not include the cost for labor, transportation or other costs not hereinprovided for. Replaced parts are warranted only for the remaining portion of the original warranty period.CONDITIONSThe warranty is subject to the following conditions:1.The unit must be properly installed and maintained in accordance with the Desert Aire“Installation and Operation Manual” provided with each unit and/or other documentationprovided.2.The Start-Up Report must be completed and returned to Desert Aire Service for evaluation. If nodeficiencies are identified a Warranty Validation Letter will be issued that provides all warrantydates and coverage. If installation or start-up deficiencies are present, these must be corrected3.and communicated to Desert Aire in order to activate warranty.This warranty shall not apply to any part that has been tampered with, or has been subject tomisuse, negligence or accident. A warranty can be obtained for altered equipment but only withwritten consent from Desert Aire.4.5.The following parts and components are excluded from the warranty: belts, filters, driers, fuses andrefrigerant.Refrigerant coils or other components that corrode due to improperly balanced pool chemistry orcorrosive air quality will not be warranted.6.All replacements or repairs will be FOB Germantown, WI.7.This warranty shall be null and void if defects or damages result from unauthorized opening of therefrigerant circuit, tampering with factory set controls, or operating outside the original designconditions.Desert Aire - SA Manual3
8.9.Desert Aire shall not be liable for labor costs incurred in diagnosing the problem, or the removalor replacement of the part or parts being repaired.Desert Aire must preauthorize all warranty coverage described herein.Extended Warranty:Your Desert Aire unit may have extended warrantees beyond this Standard Limited Warranty document.Extended warrantees are only available at the time of the purchase of the original equipment. These extended warrantees are covered under a separate document and their terms and conditions are separate from this document.It is mentioned in this document for informational purposes only. Any Extended Warranties will be identified on theWarranty Validation Letter.Any and all incidental or consequential damages are expressly excluded from this warranty. Some states do not allowthe exclusion of incidental or consequential damages for personal injury, so the above limitations may not apply to youfor certain damages. This warranty gives you specific legal rights, and you may also have other rights, which varyfrom state to state. No person or representative is authorized to make any warranty or assume any liability not strictlyin accordance with the aforementioned.Inquiries regarding warranty matters should be addressed to:Desert Aire Corp c/o Service ManagerN120 W18485 Freistadt Road Germantown, WI 53022PH: (262) 946-7400 FAX: (262) 946-7401 E-MAIL: service@desert-aire.comAdditional copies of this manual can be purchased for a nominal fee from Desert Aire. Desert Aire also posts the mostcurrent revision of our I/O Manuals on our website. For a digital copy of the I/O Manual for your unit revision, pleasesubmit request to the contact information listed above.Gas Heat Exchanger Ten (10)-Year Prorated Warranty Terms (For SA units with gas heat only)Desert Aire offers an extended prorated eight (8)-year warranty for gas heat exchanger. All other heater componentsare covered under the initial 2 year warranty.2 Years Parts Only from date of shipment. Prorated from years 3-9 as follows:Year 3:Year 4:Year 5:Year 6:Year 7:Year 8:Year 9:4Desert Aire warrants 70% of replacement priceDesert Aire warrants 60% of replacement priceDesert Aire warrants 50% of replacement priceDesert Aire warrants 40% of replacement priceDesert Aire warrants 30% of replacement priceDesert Aire warrants 20% of replacement priceDesert Aire warrants 10% of replacement priceDesert Aire - SA Manual
Safety Labels are used throughout this manual. They comply with the ANSI Z535.4 Standard.Please be familiar with the following labels and their definitions.This is the safety alert symbol. It is used to alert you to potentialpersonal injury hazards. Obey all safety messages that follow thissymbol to avoid possible death or injury.Indicates an imminently hazardous situation which, if notavoided, will result in death or serious injury.Indicates a potentially hazardous situation which, if notavoided, could result in death or serious injury.Indicates a potentially hazardous situation which, if notavoided, could result in minor or moderate injury.Caution used without the safety alert symbol indicates apotentially hazardous situation which, if not avoided, couldresult in property damage.Product Warning for the State of California:Desert Aire - SA Manual5
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TABLE OF CONTENTS1Introduction .91.1Inspection .91.2Freight Damage Claims .91.3Rigging .91.3.1 Rigging the Dehumidifier .92Installation .112.1Position and Service Clearance .112.2Outdoor Air and Exhaust Air (When Equipped) .152.2.1Units with Outdoor Air Only .162.2.2Units with Exhaust Air Energy Recovery .182.3Condensate Drain Piping .202.4Pool Water Piping .212.5Auxiliary Heat Coil Piping .232.6Remote Condenser (Optional) .242.7High Voltage Wiring .242.8Controls and Sensors .252.8.1Air Temperature/Humidity Sensors .252.8.2Water Temperature Sensor .262.8.3Installation of Sensors for the SelectAire with Integral Exhaust Fan .262.8.3.1 Indoor Static Sensor Installation .262.8.3.2 Outdoor Static Sensor .27Installation of Optional VOC Monitoring Sensor .28Auxiliary Heating Control Wiring .292.9.1Auxiliary Heating - Dry Contact Closure .292.9.2Auxiliary Heating - Proportional Signal .30Gas Heater (Optional) .302.10.1 Gas Heater Installation .312.92.102.8.42.10.1.1 Gas Heater Installation with Roofcurb .312.10.1.2 Gas Heater Installation with Housekeeping Pad or Dunnage .312.10.1.3 Mating Flanges .312.10.1.4 Heater Alignment .322.10.1.5 Outdoor Units: B-Vent Support Set-up Instructions .332.10.1.6 Indoor Unit Set-up Instructions .362.10.1.7 Finalize Installation .362.10.2 Gas Heater Start-up .362.11Auxiliary Pool Water Heating .372.12Smoke Alarm Interlock .37Desert Aire - SA Manual7
3Start-Up Procedures .393.1Preliminary Inspection .393.2Airflow Balancing .403.2.1Airflow Setup of SelectAire without Integral Exhaust Fan .413.2.2Airflow Setup of SelectAire with Integral Exhaust Fan .433.2.3Final Air Balancing .473.3Refrigeration Testing .513.4General Testing .533.5Routine Maintenance Schedule .533.5.1Service Every Month .533.5.2Service Every Six Months .54Troubleshooting .554.1The Blower Does Not Run .554.2The Compressor(s) Do Not Run .554.3High Pressure Alarms / Readings Above 575 PSIG .564.4Low Pressure Alarms / Evaporator Coil Icing .574.5The Pool Water Is Too Cold .57Appendix .595.1Compressor Failure .595.1.1Compressor Replacement .595.2Recommended Duct Design .625.3Pool Water Chemistry .635.4Recommended Controller Settings .635.4.1Controller Set Points .635.5System Operating Modes .635.6Component Replacement, Charge, Evacuation, & Leak Instructions .645.7System Rating Plate .685.8Start-Up Supervision Supplemental Information .685.9System Start-Up Report .71Start-Up Report .72Compressor Replacement Form .78458Desert Aire - SA Manual
1IntroductionDesert Aire dehumidifiers are designed to provide years of reliable service when installed properly.Read these instructions carefully before you install the dehumidifier.1.1InspectionDesert Aire inspects and tests each dehumidifier before it leaves the factory so that you receive a qualitypiece of equipment. Unfortunately, equipment may become damaged in transit. Inspect thedehumidifier carefully before signing the receiving papers. Check for both visible and concealed damage.Use a halogen leak detector to check the piping for refrigerant leaks.1.2Freight Damage ClaimsIf the dehumidifier has been damaged, document the extent of the damage. Take pictures if possible.Next, obtain a claim form from the carrier. Promptly fill out and return the form. Carriers may deny claimsthat you have not filled out within a week of delivery. Notify Desert Aire of any damage.1.3Rigging1.Failure to observe rigging instructions may lead to equipment damage,personal injury or death.2.Lifting method and procedure must comply with all local and national codesand regulations.3.4.The use of safety slings in addition to lifting lugs is required.Do not lift the dehumidifier in high winds or above people.Desert Aire dehumidifiers are solidly built and can be very heavy. Avoid personal injury and damagedequipment by planning the installation carefully. Use moving equipment whenever possible.1.3.1 Rigging the DehumidifierDesert Aire dehumidifiers are equipped with four or more lifting lugs. Use spreader bars andsafety straps when you use these lugs for rigging. Utilize all of the lifting lugs provided when hoisting unit. Test-lift the dehumidifier to verify that it is properly balanced. Do not lift the dehumidifier in high winds or above people. The top panels are not designed to support the weight of persons. The top panels areweather proofed and excessive weight may cause water to penetrate through crackedseams. Damage incurred through caved or distorted top panels will not be coveredunder warranty. If you must walk on the top panels, carefully walk on the edges wherestructural integrity is greatest.Desert Aire - SA Manual9
10Figure 1 - Typical Rigging for the SA Dehumidifier1.Do not tip the dehumidifier on it’s side.2.Avoid dropping the unit down stairways or subjecting it to severemechanical shock.Desert Aire - SA Manual
2InstallationManual applies to standard unit configurations only.2.1Position and Service ClearanceDesert Aire dehumidifiers require routine maintenance to operate efficiently. Allow a minimum of 36 inches of clearance around the service side of the dehumidifier for piping,electrical connections, and service access. Install the unit on a sturdy, level mounting base orplatform that will prevent vibration and sound transmission. Never install the dehumidifier on awooden platform without consulting the design engineer for spring isolation requirements andsound control materials. Do not install the unit near occupied rooms such as offices or guestrooms. Level the dehumidifier to ensure proper condensate drainage. Install blocks under the unit if necessary to provide clearance for the condensate trap. Installblocks underneath each corner and each lifting lug.Figure 2 - Dehumidifier with Blocks Installed for Trap Clearance Install outdoor dehumidifiers equipped with an outdoor air intake away from plumbing vents,furnace flues, or equipment which could contaminate the air supply. If the dehumidifier is to be mounted on a roof curb, make sure that the curb has been properlymounted and supported. Place gasketing around the perimeter of the curb before setting thedehumidifier in place. This will help prevent air or water leaks. You must not install an indoor rated dehumidifier in an unconditioned space or where ambienttemperatures can fall below 45 F. If you must install the dehumidifier outside or in anunconditioned space, you must use an outdoor rated dehumidifier. Desert Aire equipsoutdoor-rated units with weatherproofing and thicker insulation. You can determine if your unit isoutdoor-rated by inspecting the unit rating plate. (See Section 5.7 in the Appendix for details.) Duct design and installation should conform to ASHRAE and SMACNA low velocity ductstandards. See Section 5.2 in the Appendix for additional duct recommendations.Desert Aire - SA Manual11
WEATHER-PROOF INTAKE HOODMOTOR OPERATED DAMPERINSULATED OUTSIDE AIR INTAKE DUCT,(SIZE FOR CODE REQUIREMENTS)INSTALL TURNING VANESIN ALL ELBOWS.REMOTECONDENSERLOCATE ANODIZED ALUMINUMRETURN AIR GRILLE AS HIGHAS POSSIBLE IN ROOM.FLEXIBLE NEOPRENEDUCT CONNECTORTEMPERATURE AND HUMIDITY CONTROLSMECHANICAL EXHAUST WITH BACK-DRAFT DAMPER(WALL OR ROOF MOUNTED)NOTE: CAPACITY SHOULD NOT EXCEED INTAKE VOLUME.12Desert Aire - SA ManualFigure 3 - Basic Pool Room Layout
Use turning vanes whenever the duct makes an abrupt turn, especially in the returnair duct. Poor return air distribution will reduce the moisture removal.VAPOR BARRIERDESERT AIRE DEHUMIDIFIERWINDOWANODIZED ALUMINUMRETURN AIR GRILLELOCATE AS HIGH ASPOSSIBLEAUX. HEATINGRETURN AIR DUCTFILTER RACKFLEXIBLE DUCTCONNECTIONSCONDENSATE PIPINGSUPPLY PIPINGLOOP SYSTEMPOOL DECKPOOLANODIZED ALUMINUMFLOOR DIFFUSERS(SIZE FOR PROPERAIR FLOW)P.C.D. COATED SPIRALGALVANIZED PIPE Figure 4 - Typical In-Ground Duct LayoutYou may use galvanized sheet metal ducts for all but underground installations andseverely corrosive environments.Do not use fiberglass duct boards or acoustic duct liner for air distribution in highlyhumid applications, such as pool room dehumidification.If a duct must be installed in an unconditioned area, or if you are installing anoutdoor air intake duct, insulate it with two inches of fiberglass duct wrap with anintact vapor barrier.Direct the supply air toward skylights, exterior walls and windows, and spectatorareas. Since air movement will increase the evaporation rate of the pool, directthe supply air grilles away from its surface.Desert Aire - SA Manual13
VAPOR BARRIERMAIN SUPPLYAIR DUCTBRANCH SUPPLY AIR DUCTSKYLIGHTANODIZED ALUMINUMCEILING DIFFUSERANODIZED ALUMINUMSIDEWALL REGISTERVAPOR BARRIERDESERT AIRE DEHUMIDIFIERANODIZED ALUMINUMRETURN AIR GRILLELOCATE AS HIGH AS POSSIBLEWINDOWRETURN AIR DUCTFLEXIBLE DUCTCONNECTIONSPOOL14Desert
Select Aire (SA) systems Installation and Operation Manual are dual refrigeration circuit dehumidifiers. Systems remove between 55 and
