Desert Aire LW Manual de usuario
Installation and Operation Manual
• Designed for low
ambient temperatures,
35° to 80°F
• Defrost cycle uses hot
gas defrost to quickly
eliminate frost from
evaporator coils
• Timed defrost cycle
initiated automatically
only when required
• Heat of rejection can
be delivered to the
space or optional
remote condenser
LW System
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Desert Aire - LW Manual
DANGER
ONLY TRAINED, QUALIFIED PERSONNEL SHOULD INSTALL AND/OR SERVICE
DESERT AIRE EQUIPMENT. SERIOUS INJURY, DEATH AND PROPERTY DAMAGE CAN
RESULT FROM IMPROPER INSTALLATION/SERVICE OF THIS EQUIPMENT. HIGH VOLTAGE
ELECTRICAL COMPONENTS AND REFRIGERANT UNDER PRESSURE ARE PRESENT.
Desert Aire Dehumidication Equipment
Standard Limited Warranty
Desert Aire warrants the dehumidifying unit to be free from defects in materials and workmanship subject to the terms,
conditions and limitations stated herein.
TERMS
Desert Aire warrants all components (except as noted) for a period of two (2) years from the date of shipment. This
warranty shall be limited to the supply of new or rebuilt parts for the part which has failed because of defects in
workmanship or material, and does not include the cost for labor, transportation or other costs not herein provided for.
Replaced parts are warranted only for the remaining portion of the original warranty period.
CONDITIONS
The 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 documentation provided.
2. The Start-Up Report must be completed and returned to Desert Aire Service for evaluation. If no
decienciesareidentiedaWarrantyValidationLetterwillbeissuedthatprovidesallwarranty
datesandcoverage.Ifinstallationorstart-updecienciesarepresent,thesemustbecorrected
and communicated to Desert Aire in order to activate warranty.
3. This warranty shall not apply to any part that has been tampered with, or has been subject to
misuse, negligence or accident. A warranty can be obtained for altered equipment but only with
written consent from Desert Aire.
4. The following parts and components are excluded from the warranty: belts, lters, driers, fuses and
refrigerant.
5. Refrigerant coils or other components that corrode due to improperly balanced pool chemistry or
corrosive 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 the
refrigerant circuit, tampering with factory set controls, or operating outside the original design
conditions.
8. Desert Aire shall not be liable for labor costs incurred in diagnosing the problem, or the removal
or replacement of the part or parts being repaired.
9. Desert Aire must preauthorize all warranty coverage described herein.
4Desert Aire - LW Manual
ExtendedWarranty:
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
identied on the Warranty Validation Letter.
Any and all incidental or consequential damages are expressly excluded from this warranty. Some states do not allow
the exclusion of incidental or consequential damages for personal injury, so the above limitations may not apply to you
for certain damages. This warranty gives you specic legal rights, and you may also have other rights, which vary
from state to state. No person or representative is authorized to make any warranty or assume any liability not strictly
in accordance with the aforementioned.
Inquiries regarding warranty matters should be addressed to:
Desert Aire Corp
c/o Service Manager
N120 W18485 Freistadt Road
Germantown, WI 53022
PH: (262) 946-7400
TOLL FREE: (800) 443-5276
FAX: (262) 946-7401
Additional copies of this manual can be purchased for a nominal fee from Desert Aire. Submit requests to the contact
information listed above.
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Desert Aire - LW Manual
SafetyLabelsareusedthroughoutthismanual.TheycomplywiththeANSIZ535.4Standard.
Pleasebefamiliarwiththefollowinglabelsandtheirdenitions.
This is the safety alert symbol. It is used to alert you to potential
personal injury hazards. Obey all safety messages that follow this
symbol to avoid possible death or injury.
Indicates an imminently hazardous situation which, if not
avoided, will result in death or serious injury.
Indicates a potentially hazardous situation which, if not
avoided, could result in death or serious injury.
Indicates a potentially hazardous situation which, if not
avoided, could result in minor or moderate injury.
Caution used without the safety alert symbol indicates a
potentially hazardous situation which, if not avoided, could
result in property damage.
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TABLEOFCONTENTS
1. Introduction ...................................................................................................................... 9
1.1 Inspection
............................................................................................
.................... 9
1.2 Freight Damage Claims .......................................................................................... 9
1.3 Rigging ....................................................................................................................... 9
1.3.1 Rigging the Dehumidier ............................................................................. 9
1.3.2 Rigging the Remote Condenser .................................................................. 10
2. Installation ........................................................................................................................ 11
2.1 Location of Dehumidier
.........................................................................................
11
2.2 Duct Installation ...................................................................................................... 13
2.3 Condensate Drain Piping ........................................................................................ 14
2.4 High Voltage Wiring ................................................................................................ 16
2.4.1 High Voltage Connections ......................................................................... 16
2.4.2 Wire and Fuse Sizing ................................................................................. 17
2.5 Controls and Wiring ................................................................................................ 17
2.6 Remote Condenser (Optional) ................................................................................ 17
3. Start-Up Procedures ..................................................................................................... 19
3.1 Preliminary Inspection ............................................................................................ 19
3.2 System Operation Modes ....................................................................................... 20
3.2.1 Dehumidication/AirReheat/OptionalOutdoorAir................................. 21
3.2.2 Dehumidication/AirCooling(RemoteReadyUnitsOnly)....................... 21
3.2.3 Evaporator Defrost Mode .......................................................................... 22
3.2.3.1DefrostCycleSettings.................................................................. 22
3.2.4 PumpDownCycle..................................................................................... 22
3.2.5 Blower Operation ....................................................................................... 22
3.3 RefrigerationTesting............................................................................................... 23
3.4 GeneralTesting....................................................................................................... 24
3.5 RoutineMaintenanceSchedule.............................................................................. 25
3.5.1 Service Every Month ................................................................................... 25
3.5.2 Service Every Six Months .......................................................................... 25
4. Troubleshooting .............................................................................................................. 27
4.1 SupplyBlowerWillNotRun.................................................................................... 27
4.2 CompressorWillNotRun...................................................................................... 28
4.3 EvaporatorCoilDoesNotFullyDefrost................................................................. 29
4.4 HeadPressureisTooHigh.................................................................................... 30
4.5 UnitRunsbutExcessCondensateForms............................................................ 31
4.6 FrostBuild-upontheCompressororSuctionLine............................................... 31
Desert Aire - LW Manual
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5 Appendix ............................................
...............................................................................
33
5.1 CompressorFailure...........................
...............................................................
....... 33
5.1.1CompressorReplacement............................................................................ 33
5.2 RecommendedDuctDesign.................................................................................. 37
5.3 SystemGuidelines.................................................................................................. 38
5.3.1UnitAirow................................................................................................... 38
5.3.1.1DeterminingSystemAirow......................................................... 38
5.3.1.2BlowerAdjustmentProcedure...................................................... 38
5.3.2 Unit Operation .............................................................................................. 40
5.3.2.1ControllerSet-Points.................................................................... 40
5.3.2.2RefrigerationSystemPressures................................................... 40
5.4 ComponentReplacement,Charge,Evacuation,&LeakInstructions................... 41
5.5 RatingPlate........................................................................................................... 45
5.6 SystemStart-UpReport........................................................................................ 45
Service Bulletin 027 ................................................................................................ 46
LWSeriesStart-UpReport..................................................................................... 48
LWSeriesCompressorReplacementForm............................................................ 52
Desert Aire - LW Manual
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1. Introduction
Desert Aire dehumidiers are designed to provide years of reliable service when installed
properly. Read these instructions carefully before you install the dehumidier.
1.1 Inspection
Desert Aire inspects and tests each dehumidier before it leaves the factory so that you receive a
quality piece of equipment. Unfortunately, equipment may become damaged in transit. Inspect
the dehumidier carefully before signing the receiving papers. Check for both visible and
concealed damage. Remove crating and inspect the exterior cabinet for damage. Dented panels,
broken crating or any uids leaking from the unit should be documented upon delivery.
1.2 FreightDamageClaims
If the dehumidier has been damaged, document the extent of the damage. Take pictures if
possible. Next, obtain a claim form from the carrier. Promptly ll it out and return the form.
Carriers deny claims that you have not lled out within a week of delivery. Notify Desert Aire
of any damage.
1.3 Rigging
1. 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 codes and
regulations.
3. The use of safety slings in addition to lifting lugs is required.
4. Do not lift the dehumidifier in high winds or above people.
Desert Aire dehumidiers are solidly built and can be very heavy. Avoid personal injury and
damaging the equipment by planning the installation carefully. Use moving equipment whenever
possible.
1.3.1 RiggingtheDehumidier
Depending upon the unit type, various rigging methods are used to best t the equipment.
Personnel should avoid stepping on the top of the unit. Desert Aire dehumidiers are not
designed to support the weight of a person on all portions of the roof. Damage incurred
through caved or distorted top panels will not be covered under warranty. If you must
walk on the top panels, carefully walk on the edges where structural integrity is greatest.
Desert Aire - LW Manual
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1. Do not tip the dehumidifier on its side.
2. Avoid dropping the unit down stairways or subjecting it to severe mechanical shock.
1.3.2 RiggingtheRemoteCondenser
Refer to separate Remote Condenser Manual for specications regarding
rigging.
Desert Aire - LW Manual
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