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Desert Aire ExpertAire LC Series Installation And Operation Manual

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• Meets AHRI Standard 910.
• Effective humidity control:
4 to 100 lbs per hour.
• Wide range of ambient
temperatures: 65° to
95° F.
• Air conditioning option.
• Optional outdoor air
intake to help meet
ASHRAE 62 ventilation
requirements.
• Multiple heat sink options
including pool water
heating.
• Scroll compressors for
high efficiency and
longevity.
• Galvanneal cabinet with
high impact, powder coat
textured paint.
• Auxiliary heat including
hot water and electric
coils.
Installation and Operation Manual
LV System
LC System

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Summary of Contents for Desert Aire ExpertAire LC Series

  • Page 1 Installation and Operation Manual • Meets AHRI Standard 910. • Effective humidity control: 4 to 100 lbs per hour. • Wide range of ambient temperatures: 65° to 95° F. LC System • Air conditioning option. • Optional outdoor air intake to help meet ASHRAE 62 ventilation requirements.
  • Page 3 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.
  • Page 4 N120 W18485 Freistadt Road Germantown, WI 53022 PH: (262) 946-7400 FAX: (262) 946-7401 E-MAIL: service@desert-aire.com Additional copies of this manual can be purchased for a nominal fee from Desert Aire. Submit requests to the contact information listed above. Desert Aire - LC/LV Manual...
  • Page 5 Desert Aire - LC/LV Manual...
  • Page 6 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. Desert Aire - LC/LV Manual...

  • Page 7: Table Of Contents

    3.2.3.1 LC and LV Operation Modes ............3.2.4. Determining if Outdoor Air Pre-Heating is Required ........3.2.5. Approximating Outdoor Air Volume ............3.3. Airflow Balancing ....................3.3.1. Blower Adjustment Procedure ..............3.3.2. Airflow Balancing for LC Dehumidifiers ............. 3.3.3. Airflow Balancing for LV Dehumidifiers ............3.4. Refrigeration Testing ....................3.5. General Testing ...................... Desert Aire - LC/LV Manual...
  • Page 8 Component Replacement, Charge, Evacuation, & Leak Instructions ....5.6. Rating Plate ......................Start-up Supervision Supplemental Information (Optional) ........5.8. System Start-up Report ..................LC/LV Factory Start-up Supervision ............... LC/LV Start-up Report .................... LC/LV Series Compressor Replacement Form ............Desert Aire - LC/LV Manual...

  • Page 9: Introduction

    Freight Damage Claims If the dehumidifier has been damaged, document the extent of the damage. Take pictures. Next, obtain a claim form from the carrier. Promptly fill out and return the form. Carriers may deny claims that you have not filled out within a week of delivery. Notify Desert Aire of any damage. Rigging Failure to observe rigging instructions may lead to equipment damage, personal injury, or death. Lifting method and procedure must comply with all local and national codes and regulations.

  • Page 10: Rigging The Remote Condenser

    The optional remote condensers are equipped with four or more lifting eyes. Test-lift the remote condenser to verify that it is properly balanced. Figure 1 - Typical Rigging for an Optional Remote Condenser Do not lift the remote condenser by its refrigeration headers or return bends. Desert Aire - LC/LV Manual...

  • Page 11: Installation

    Do not install the unit near occupied rooms such as offices or guestrooms. Do not attempt to conserve installation space by fabricating restrictive ductwork with abrupt bends. You may reduce the operating efficiency and the moisture removal capacity of the dehumidifier. See section 5.2 for detailed duct installation instructions. Figure 2 - Typical Floor Installation Desert Aire - LC/LV Manual...
  • Page 12 LV Only - Do not install an indoor-rated dehumidifier in an outdoor or a wet environment. You must not install a standard dehumidifier in an unconditioned space or where ambient temperatures can fall below 45°F. If you must install the dehumidifier outside or in an unconditioned space, such as an attic, you must use an outdoor-rated dehumidifier. Desert Aire equips outdoor-rated dehumidifiers with weatherproofing and thicker insulation. You can determine whether your dehumidifier is outdoor rated by inspecting the unit rating plate. See section 5.6 for details. Desert Aire - LC/LV Manual...

  • Page 13: Duct Installation

    You must install the outdoor air intake away from all sources of airborne contamination such as exhaust fans or plumbing vents. You can use galvanized sheet metal ducts for most applications. However, you should use aluminum or stainless steel ducts for extreme applications such as chemical-laden environments. Desert Aire - LC/LV Manual...
  • Page 14 RETURN AIR GRILLE AS HIGH FLEXIBLE NEOPRENE AS POSSIBLE IN ROOM. DUCT CONNECTOR TEMPERATURE AND HUMIDITY CONTROLS MECHANICAL EXHAUST WITH BACK-DRAFT DAMPER (WALL OR ROOF MOUNTED) NOTE: EXHAUST LOW Figure 5 - Basic Pool Room Layout Desert Aire - LC/LV Manual...
  • Page 15 LOCATE AS HIGH AS POSSIBLE WINDOW RETURN AIR DUCT ANODIZED ALUMINUM FLEXIBLE DUCT RETURN AIR GRILLE CONNECTIONS LOCATE AS HIGH AS POSSIBLE POOL RETURN AIR DUCT POOL DECK FLEXIBLE DUCT CONNECTIONS Figure 6 - Soffit Duct Layout Desert Aire - LC/LV Manual...

  • Page 16: Condensate Drain Piping

    Use concrete blocks or steel dunnage to raise the dehumidifier high enough above the floor to provide clearance for the field-supplied condensate drain trap. Note: While the supply blower runs, the drain pan area inside the dehumidifier operates at a negative pressure. Your unit requires a p-trap in the condensate drain pipe to prevent condensate from being drawn into the cabinet of the dehumidifier. Desert Aire - LC/LV Manual...
  • Page 17 Trap the condensate as shown in Figure 9. The P-trap dimensions in Figure 9 are sized for a maximum return air static of 2.0” of water. If your return air static exceeds this specification, consult Desert Aire for help in resizing the P-trap. You may also need to install a cleanout tee or plug near the trap. Note that the drain opening in the drain pan is off-center to simplify its cleaning and servicing.

  • Page 18: Water Heating Applications

    30 GPM @ 5.7 ft W.C. 14 GPM @ 7.2 ft W.C. Figure 10 - Standard Unit Water Flow Rates for LC and LV Units A typical water circuit arrangement is shown in Figure 11. To simplify the commissioning and servicing of this job, you should install a flow meter and isolation valves in the pool water lines which feed the dehumidifier. Desert Aire - LC/LV Manual...
  • Page 19 Return Air Main Pool Pump Vibration Isolators Water Temp Sensor (Dry Well) P-Trap Water Inlet Base (If Required) Water Outlet Figure 11 - Proper Pool Water Heating Installation for Desert Aire LC and LV dehumidifiers Desert Aire - LC/LV Manual...
  • Page 20 Figure 12 - Proper Pool Water Heating Installation for Desert Aire LV dehumidifiers Desert Aire - LC/LV Manual...

  • Page 21: Low Water Flow Protection

    Figures 14 and 15. Note that custom systems or non-standard line configurations may have been specified. Refer to the submittal documentation or label adjacent to the remote condenser connections to confirm the charge and lines for those systems. Unit Factory Refrigerant Charge (Lbs.) R-410A Unit Size Refrigerant (Lbs.) Figure 13 - Unit Factory Charge Desert Aire - LC/LV Manual...
  • Page 22 Desert Aire - LC/LV Manual...
  • Page 23 1 1/8 33.0 47.5 26 < 50 1 1/8 40.1 54.6 51 < 75 1 3/8 52.4 76 < 100 1 3/8 Figure 15 - Quiet Series Remote Condenser (RCU) Line Sizes and Additional Charge Desert Aire - LC/LV Manual...

  • Page 24: High Voltage Wiring

    On three phase units the power supply must have 4 connections (3 power and 1 ground). Connect the power supply wires to the main power block located in the upper section of the electrical compartment. Figure 16 - Single-Phase and Three-Phase System Power Connection Desert Aire - LC/LV Manual...

  • Page 25: Wire And Fuse Sizing

    Install the duct-mount sensor in the return air duct. Auxiliary Heating Control Wiring Note: You must use the Desert Aire control system to control or interlock with the room heating system. This prevents wide fluctuations in room air temperature. It also prevents the heater from trying to heat the room while the dehumidifier is running in cooling. 2.8.1 Auxiliary Heating –...

  • Page 26: Auxiliary Heating - Proportional Signal

    “neutral” 24 VAC input and the “negative” signal input. You must follow the instructions included from the valve manufacturer. Observe the proper polarity, or you may damage both the valve and the Desert Aire controller. See the unit wiring schematic for information on signal wire connection points.

  • Page 27: Start-Up Procedure

    Preliminary Inspection Verify that all contractors have completed their work. Find the Desert Aire “LC and LV Start-Up Report,” which is normally placed inside this manual within the electrical compartment of the dehumidifier. You must fill out the start-up report to validate the dehumidifier warranty.

  • Page 28: Outdoor Air Applications

    Outdoor Air Applications 3.2.1 Outdoor Air Option Equipped Units Construction codes often require you to introduce outdoor air into a commercial building while it is occupied. Desert Aire dehumidifiers can be factory-configured to help you comply with these codes. Several factory-installed options, which are available by special order, can include flanging for an outdoor air duct connection and a fresh air intake box with air filters and a damper. Desert Aire - LC/LV Manual...
  • Page 29 When ordered with an outdoor air intake option, refer to the Desert Aire LC/LV control schematic. NOTE: You must provide a transformer or a power source for the relay R2 and the outdoor air damper and the exhaust blower contactor.

  • Page 30: Standard Systems In Conjunction With Outdoor Air

    The introduction of outdoor air into the return air duct can lead to a number of problems. This is not recommended and will void the warranty in most instances. Contact the Desert Aire Service Department before proceeding with such an installation. If outdoor air must be added to satisfy code requirements on a non-outdoor air equipped system, it is advised that the intake and exhaust be connected directly to the space being conditioned.

  • Page 31: Outdoor Air Supplemental Information

    Figure 21 - LC Models left; LV Models right - Occupied Mode Operation 3.2.4 Determining if Outdoor Air Pre-Heating is Required Desert Aire systems require that outdoor air be pre-heated if mixed air temperatures inside the unit may fall below 45°F. To determine if an application requires outdoor air pre-heating, the following study needs to be conducted: Determine the following: •...

  • Page 32: Approximating Outdoor Air Volume

    3.2.5 Approximating Outdoor Air Volume When servicing or installing a Desert Aire unit, it may be necessary to determine and/or set the amount of outdoor air CFM entering the unit. Proper outdoor air CFM settings can be approximated using two simple equations as follows:...

  • Page 33: Airflow Balancing

    = 2300, LA = 73°F, RA = 82°F, OA = 40°F TEMP TEMP TEMP Solution: = 2300 x (73°F – 82°F) / (40°F – 82°F) = 490 CFM Airflow Balancing To ensure code compliance and long equipment service life, proper airflow must be verified by a qualified air balancer. Shut off the compressor to prevent the refrigeration system from running while you balance the air. 3.3.1 Blower Adjustment Procedure Warning! Disconnect Power to the Unit before you adjust the Blowers. Desert Aire - LC/LV Manual...

  • Page 34: Airflow Balancing For Lc Dehumidifiers

    If this happens, consult the Desert Aire Service Department 262-946-7400. Prior to any call to the Desert Aire Service Department please have the unit serial number and model number.
  • Page 35 “On”. Any one of the three methods can be used, but it is recommended that the method that will be used in normal unit operation be tested during this step. Check the unit display Desert Aire - LC/LV Manual...

  • Page 36: Airflow Balancing For Lv Dehumidifiers

    Connect the sensors to a manometer with appropriate hoses to measure the pressure drop (in inches of water column) of the airflow through the reheat condenser. The design pressure drop of the airflow is listed on a label on the compartment door. The static pressure sensors should be covered when not in use to prevent dirt from clogging the orifices. These sensors may be used with the electric heat airflow interlock for proof of flow. Desert Aire - LC/LV Manual...
  • Page 37 System CFM Pressure Drop Range (Inches W.C.) 1500 0.24” - 0.26” 2100 0.18” - 0.20” 0.32” - 0.34” 3000 0.37” - 0.39” 3400 0.44” - 0.46” 3800 Figure 25 - Standard Reheat Coil Pressure Drops Desert Aire - LC/LV Manual...

  • Page 38: Refrigeration Testing

    This is a critical component to the longevity of the system. Some Desert Aire systems are shipped in sections to allow for installation of some of the sections in a location much different than another. An example is a unit with a remote condenser ready circuit. The dehumidifier may be installed indoors near the conditioned...
  • Page 39 65.1 - 70.0 75.1 - 80.0 85.1 - 90.0 70.1 - 75.0 80.1 - 85.0 30.0 - 40.0 40.1 - 50.0 50.1 - 60.0 60.1 - 70.0 70.1 - 80.0 Figure 27 - Superheat Minimum Values Chart Desert Aire - LC/LV Manual...

  • Page 40: General Testing

    Make sure that the fans cycling switches, which are mounted on the condenser, are correctly piped and have been set according to the Desert Aire condenser wiring diagram. Verify that the fans are blowing air vertically upward when they run.

  • Page 41: Service Every Six Months

    Pool Water Chemistry Pool chemistry must be maintained to ensure the proper pH, total alkalinity, calcium hardness and free chlorine. NSPI recommends the following levels for pool chemistry: 7.4 – 7.6 Total Alkalinity 100 – 150 ppm Calcium Hardness 200 – 250 ppm (Plaster Pool) 175 – 225 ppm (Vinyl or Painted Pool) Free Chlorine 1.0 – 3.0 ppm Desert Aire - LC/LV Manual...
  • Page 42 Excessive chemical levels in the pool can be dangerous to users and can damage pool hardware, including the dehumidification system. SERVICE PROBLEMS CAUSED BY EXCESSIVE CHEMICAL LEVELS ARE NOT COVERED UNDER WARRANTY. Desert Aire - LC/LV Manual...

  • Page 43: Troubleshooting

    The Compressor Does Not Run NOTE: Under some circumstances the compressor will not run even though the humidity in the room may be too high. See section 5.4 for more information on the control sequence for the dehumidifier. Desert Aire - LC/LV Manual...

  • Page 44: Evaporator Coil Ices Up

    Evaluate filter pressure drop and replace if necessary. Defective expansion valve Evaluate expansion valve performance and replace if necessary. Restriction in refrigeration piping 1) Check coil for kinks in tubing. 2) Evaluate debris in distributor. Desert Aire - LC/LV Manual...

  • Page 45: Head Pressure Is Too High

    4) Verify pressure control cut-in and 4) Pressure control inactive differential settings. Fully open service valves. Service valves closed or not fully open Re-evaluate remote condenser Excessive pressure drop in line sets installation Desert Aire - LC/LV Manual...

  • Page 46: Unit Runs But Excess Condensation On Walls And Windows

    Lack of water heating may be a symptom of another refrigeration or controls problem not related to the water circuit. Under normal conditions the water temperature rise across the dehumidifier should be between 4° and 15°F. • LOW TEMPERATURE INCREASE OF WATER is a symptom of excessive water flow rate. Excessive water flow can erode the water condenser and cause premature equipment failure. • HIGH TEMPERATURE INCREASE OF WATER is a symptom of insufficient water flow. This can be caused by an undersized pump, insufficient water diversion or restrictions in the water piping such as dirty filter(s). This would also lead to high refrigerant discharge operating pressures in the water heating mode. Desert Aire - LC/LV Manual...

  • Page 47: Appendix

    High current draw may be related to a bearing issue or a motor winding issue. The initial inspection must be combined with a final analysis of the machine when returned to working order to confirm diagnosis. Specific items should be noted before the replacement to give the best indications of the failure and complete the diagnosis as the new compressor is installed. The following data should be taken to assist in diagnosis: Desert Aire - LC/LV Manual...
  • Page 48 The following procedures must be used depending on the results of the test above: Any Compressor Service • A new filter dryer must be installed when the system has been opened. If there is no acid or particulates indicated, the new compressor can be installed and run. Proceed to Testing and Final Diagnosis. Desert Aire - LC/LV Manual...
  • Page 49 Particulate Indicated • Install a replaceable core liquid line filter shell. Note that larger Desert Aire systems will have replaceable core liquid line filter shells installed from the factory. The pressure drop levels will be monitored and several core changes may be required. Install ball valves on either side of the filter shell to facilitate these changes. • Install a secondary filter such as Sporlan FS-series or equivalent 20 micron filter in the replaceable core. • Ensure there are access fittings directly upstream and downstream of the liquid filter. There is typically one fitting installed on the filter shell. There is typically a fitting installed on the outlet side of the receiver. Desert Aire - LC/LV Manual...
  • Page 50 It is possible that there was an internal defect in the compressor or normal mechanical wear occurred over time. Compressor longevity generally is a function of load, lubrication, electrical input conditions, and temperatures. The cause for the compressor failure must be identified before unit is placed back into full service. Both the identification of the cause of compressor failure and the proper cleanup of the system must be addressed to avoid repeat compressor damage. Desert Aire - LC/LV Manual...

  • Page 51: Recommended Duct Design

    Recommended Duct Design You must use proper duct design to ensure that the dehumidifier operates efficiently and without problems. Undersized or restrictive ducts reduce the system airflow, which can cause premature compressor failure. Use the following diagrams as a guide when you design the duct system. Figure 29 - Recommended Duct Designs for Desert Aire dehumidifiers Desert Aire - LC/LV Manual...

  • Page 52: System Guidelines

    / discharge superheat. However, for the sake of troubleshooting: • Normal Suction Temperature Range 32° to 40°F • Normal Discharge Temperature Range 95° to 130°F 5.3.3 Temperature Rise or Drop Across Unit • Typical air temperature rise across unit (reheat mode) 10° to 15°F • Typical air temperature drop across unit (air conditioning or water heating mode) 10° to 15°F NOTE: • If your unit does not meet these temperature ranges, check the system airflow • These guidelines do not apply to dehumidifiers with outdoor air intakes when they are in the “occupied” mode. Desert Aire - LC/LV Manual...

  • Page 53: Sequence Of Operation

    It is possible to set the unit to “Water Heat Priority” to have this mode of operation divert the energy to the pool water rather than the air for reheating. This should be done with caution as there must be sufficient capacity of auxiliary heating to overcome the cooling of the air. If set for Water Heat Priority the air which is discharged from the unit is drier and about 10°F cooler than when it entered even though cooling of the space is not required. Desert Aire - LC/LV Manual...

  • Page 54: Partial Pool Or Spa Water Heating

    5.4.8 Air Heat (Optional) LC Only – If so equipped, a standard dehumidifier can activate an internal auxiliary air heater when the room temperature drops below the set point. The supply air blower of the dehumidifier must run whenever there is a demand for air heating. You must verify this when installing an auxiliary heater. Desert Aire - LC/LV Manual...

  • Page 55: Outdoor Air (Outdoor Air Equipped Models Only)

    In all cases you must comply with Section 608 Refrigerant Recycling Rule of the Clean Air Act. Desert Aire - LC/LV Manual...
  • Page 56 Where new tube is required for replacement, use dehydrated tube where possible. Use the same type of fittings as original. Route the pipe in the exact manner as originally routed. Desert Aire - LC/LV Manual...
  • Page 57 • See Section 5.1.1 for special procedures related to compressor replacements. • Replace liquid line filter dryer as last step in system repair. Note that the dryer will readily absorb moisture from the ambient air and must be open only for as long as required for installation. • After completion of all repairs, pressure test system using nitrogen pressure decay test or nitrogen with tracer gas and appropriate leak detector. Desert Aire - LC/LV Manual...
  • Page 58 If this is not the case, review system for leaks and continue evacuation process until 1,500 microns is achieved. Purge system with nitrogen to atmospheric pressure (0 gauge pressure). Ensure all portions of systems are at this pressure. Seal system and wait 10 minutes. Desert Aire - LC/LV Manual...
  • Page 59 Test component replaced and function of the system. Many times a separate component in the system may have set a condition that causes a failure of another. Thoroughly test systems to ensure repeat failures do not occur. Desert Aire - LC/LV Manual...

  • Page 60: Rating Plate

    Rating Plate The system rating plate is attached near the electrical enclosure of the dehumidifier. Figure 30 - System Rating Plate Start-Up Supervision Supplemental Information (Optional) A Desert Aire factory start-up is an option which can be purchased with the equipment. A factory start-up includes several key services: • The expertise of an accomplished, factory-trained technician who will supervise the commissioning of the equipment.

  • Page 61: System Start-Up Report

    A factory start-up does not include installation assistance. The installing contractor is responsible for ensuring that the system is ready for start-up when the Desert Aire technician arrives. When the installing contractor is confident the system will be ready, they should contact the Desert Aire Sales representative to schedule the start-up. Please call at least two weeks before the desired start-up date to help prevent scheduling conflicts.

  • Page 62: Lc/Lv Factory Start-Up Supervision

    LC / LV FACTORY START-UP SUPERVISION A Factory Start-Up requires a Desert Aire Service Department Technician to visit the jobsite and provide supervisory experience to installing contractors as they perform the required procedures as outlined in our warranty activation Start-Up Report. The company technician will also present an educational review of the dehumidifier’s operating and maintenance requirements.
  • Page 63 SERVICE BULLETIN 010 LC / LV FACTORY START-UP SUPERVISION Please complete and sign this two page document and return it to Desert Aire for start-up scheduling. Dates will be scheduled after this form is received. Please type or print clearly.

  • Page 64: Lc/Lv Start-Up Report

    • Before continuing, read the Installation and Operations manual. If you do not fully understand the manual contact the Desert Aire Service Department. Please be prepared with the model and serial numbers located on the rating plate of the unit.
  • Page 65 I/O Manual Additional R410A Added Additional Oil Added Flush Cycle Enabled Fan Cycle Controller Settings – Refer to Air Cooled-Condenser manual for instructions SENS SN-1 SN-2 SN-3 OUTR SENS OUTR SENS OUTR SENS OUTR SENS Desert Aire - LC/LV Manual...
  • Page 66 (level should be at least 3/4 full at completion of the start up) Compressors and Refrigeration in Pool Water Heating Mode* Head Pressure Psig Suction Pressure Psig Water Inlet Temperature °F Water Outlet Temperature °F Desert Aire - LC/LV Manual...
  • Page 67 °F Building Management System Information* Communication Type BACnet MS/TP BACnet Ethernet - Modbus (circle one) Device Instance BACnet MS/TP MAC Address Baud Rate IP Address BACnet Ethernet Netmask Gateway Baud Rate Modbus Address Additional Comments: Desert Aire - LC/LV Manual...

  • Page 68: Lc/Lv Series Compressor Replacement Form

      Runs without pumping: Pressures:  _____  / _____  Other (describe):   Continuity (0 resistance) to Ground on one or more legs    Compressor drawing higher current than design    Continuity (0 resistance) between two or more legs     Compressor drawing locked rotor current    (3 phase units)      Runs without pumping: Pressures:  _____  / _____  Other (describe):   Final Determination of Failure Liquid Floodback    Low Superheat Debris Defective Expansion Valve Low Sump Oil Insufficient Motor Cooling Other (Describe): Diagnostic/Corrective Action Summary Describe what corrective action was taken to prevent a repeat failure.  _________________________________________________________________________________________________ _________________________________________________________________________________________________ _________________________________________________________________________________________________ ________________________________________________________________________________________________ Desert Aire - LC/LV Manual...
  • Page 69 PSIG  PSIG (At access fitting nearest TXV)  Suction Pressure  PSIG PSIG PSIG  PSIG (At compressor)  Liquid Line Temperature  °F °F °F  °F (At access fitting nearest TXV)  Suction Temperature  °F °F °F  °F (At Compressor)  Refrigerant Sight Glass Condition             (Clear, Intermittent Vapor, Flashing) Comp. Oil Level Sight Glass  ½       ¾       F  ½       ¾       F  ½       ¾       F  ½       ¾       F  (Shut down comps., wait 5 minutes)    Desert Aire - LC/LV Manual...
  • Page 70 Optimizing Solutions Through Superior Dehumidification Technology N120 W18485 Freistadt Road • Germantown, WI 53022 • E-mail: info@desert-aire.com Ph: (262) 946-7400 • Fax: (262) 946-7401 • Website: www.desert-aire.com 046 2016/03...

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