Emerson 3000 Balancing the Air Distribution, Under-Floor Discharge Systems, Ducted Applications

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Installation (Applicable to all Models)

2.8Balancing the Air Distribution

2.8.1Under-Floor Discharge Systems

The systems are designed for constant air delivery, therefore any unusual restrictions within the air circuit must be avoided. For under-floor air distribution, observe the following guidelines:

Select the air supply grilles and perforated panels for the raised floor to ensure minimum loss of pressure in the circuit. Air volume dampers on grilles, which extend several inches below the surface of the raised floor, are usually detrimental to airflow.

Consideration of the height of the damper on the grille in conjunction with the floor height will determine whether this type of grille may be used.

The grilles used in raised floors vary in size, the largest being approximately 18" x 6"

(457 x 152 mm). A larger grille size would be detrimental to the structural capacity of the raised floor panel. An 18" x 6" (457 x 152mm) heavy duty, pencil-proof type grille typically has 56 square inches (0.036 m2) of free area.

Perforated panels are available from various manufacturers of raised floors. These panels are usually 2' x 2' (610 x 610mm) square and have a nominal free area of approximately 108 to 144 square inches (0.07 to 0.09m2). Use caution in selecting perforated panels as some manufacturers have only 36 to 40 square inches (0.023 to 0.026m2) of free area, requiring four times as many panels.

Avoid floor elevations below 7-1/2" (190.5mm), loosely installed flooring systems, and below-floor obstructions such as: electrical wiring chases, unusually long electronic system cables, or piping clusters.

Always check specifications of the floor supplier before specifying the total number of perforated panels and grilles required to handle the air flow. The proper specifications for grilles and perforated panels should indicate the total free area required for air delivery rather than the number of panels and grilles. (See Table 3 for recommended free area required for each model.) This table indicates the recommended free area based on having the supply air grilles and perforated panels sized to handle approximately 75% of the total cubic feet per minute (CFM) of the units at a velocity of 550 to 600 ft./min. (2.8 - 3.1 m/s). The remaining 25% of the air flow in the raised floor passes through cable cutouts, cracks between the panels, and other leakage areas.

Table 3 Recommended free area ft2 (m2) for grilles or perforated panels at output velocities of 550 and 600 fpm (2.8 and 3.1 m/s)

 

 

50 Hz Units

 

 

 

 

 

60 Hz Units

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

550

 

2.8

 

600

3.1

 

 

550

 

2.8

 

600

3.1

Model

FPM

 

m/s

 

FPM

m/s

 

Model

FPM

 

m/s

 

FPM

m/s

3-ton

2.5

 

(0.01)

 

2.3

(0.01)

 

3-ton

2.5

 

(0.01)

 

2.3

(0.01)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5-ton

3.5

 

(0.02)

 

3.3

(0.02)

 

5-ton

3.8

 

(0.02)

 

3.5

(0.02)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2.8.2Ducted Applications

For ducted supply applications on upflow units, the duct work should be attached to the blower discharge flanges of the unit. For ducted return air applications, the duct work should be attached to the filter box flanges on upflow rear return units and on the unit top flange for downflow units. Refer to Figure 2 for information on upflow units and to Figure 3 for downflow units.

The duct work on upflow units must allow access to the motors/blowers for maintenance. The duct work on upflow units must be designed within the capacity of the unit, otherwise air flow and performance will be compromised.

2.8.3Plenum Installation

A solid plenum or plenum with discharge grille(s) may be installed. The plenum and instructions for its installation ship separately from the unit.

Liebert® Challenger 3000

22

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Contents Liebert Challenger 3000 with Liebert iCOM Page Table of Contents Chilled Water Models Split System ModelsFigures R407C RefrigerantTables Important Safety Instructions Liebert Challenger Important Safety Instructions System Descriptions Split Systems Prop Fan Air-CooledCentrifugal Fan Air-Cooled Water-CooledRoom Preparation Equipment InspectionLocation Considerations Equipment HandlingUnit net weight Handling With SkidRemoval of Skid Model Lb. kgUpflow BU cabinet dimensions Floor Cutout Dimensions Drain Line Piping ConsiderationsPiping connection size Piping connections for air-cooled units Downflow models Chilled Water Unit Connection Sizes-inPiping connections for air-cooled units Upflow models Installation Applicable to all Models Condensate Pump Line 1/2 OD CU used only Installation Applicable to all Models Installation Applicable to all Models Installation Applicable to all Models Installation Applicable to all Models Electrical Connections Facility Fluid and Piping MaintenanceHumidifier Supply Water-Optional Infrared Terminal Block For Customer Connectons Upflow Models with Liebert iCOM Downflow Models with Liebert iCOMPlenum Installation Balancing the Air DistributionUnder-Floor Discharge Systems Ducted ApplicationsChecklist for Completed Installation Line Voltage Condenser LocationLow Voltage Common to all models. See below for key to a dimension Air-cooled condenser statisticsLiebert Lee-Tempheater 43-9/16 51-7/16Refrigerant Piping Equivalent lengths feet for various pipe fittings Recommended line sizes OD copper, inchesCondenser refrigerant per serial tag Variable Fan Speed Control Piping Fan Speed Control SystemsVariable Fan Speed Control Materials Supplied Fan speed suction pressure transducer settings Variable Fan Speed ChargingDPN000349 Rev DPN001726 Liebert Lee-Temp Piping Liebert Lee-Temp Leak Check and Evacuation ProcedureLiebert Lee-Temp Controlled Materials Supplied Liebert Lee-TempCharging Liebert Lee-Temp suction pressure transducer settings407C Factory Piping Optional Piping Field Piping DPN001725 Condenser Factory Piping Field Piping Factory Piping Adjustment Water Regulating ValveRefrigerant control settings psi kPa Motorized Ball Valve-Digital Scroll CompressorsManual Flushing ControlControl Method StartupLocation Manual ControlDrycooler Location Drycooler InstallationPump and Drycooler Glycol Piping General GuidelinesRoom dew point temperatures Dry Bulb Wet Bulb Relative Dew Point HumidityVolume in standard Type L copper piping Filling InstructionsExpansion Tanks, Fluid Relief Valves and Other Devices Preparing the System for FillingGlycol Solutions Ethylene glycol concentrationsFilling the System For expansion tank dimensions, see on 43-3/16 43-9/16 110 5mmSee Note 30-1/4 483mm 1097mmMounting hole dimensional data Drycooler dataGlycol pump data Pump Pump Suction Pump Discharge Connection,Field Piping General arrangement-Glycol-cooled models with digital scroll Expansion Tank Field-Installed at Pressure Glycol Regulating Valve Testing Valve FunctionMotor Ball Valve-Digital Scroll Compressors Chilled Water Models WAY Valve Air-Cooled Condensing Units Water/Glycol-Cooled Condensing UnitsRefrigerant Loop R407C Charge Unit refrigerant chargeModel Lb kg Recommended refrigerant lines R407C sizes OD copper Line charges refrigerant per 100 ft m of Type L copper tubeLine coupling sizes Quick Connect Fittings Unit Dimensions See Table Outdoor Air-Cooled Condensing UnitsPFCZ42A-L PFCZ41A-L Outdoor air-cooled condensing unit-top air discharge models See Table36-1/4 38-1/2 Piping and electrical connections top air discharge152 Field-supplied unit disconnect switch Ton High Ambient Ton Quiet-LineInstalling the Indoor Condensing Unit Model Net Weight 60 Hz 50 Hz Lb kg MC40A MC39ACentrifugal Air-Cooled Condensing Units Indoor centrifugal condensing unitDucting Airflow CFM CMHPiping Connections Wire connections from evaporator DPN000207Rev0 ModTon centrifugal air-cooled condensing unit dimensional data AIR Cooled Water Cooled Water and Glycol-Cooled Condensing Units Piping ConsiderationsTon Connection Sizes Condenser Water RequirementsGlycol Systems Ton water/glycol-cooled condensing unitDPN000209 Ton water/glycol-cooled condensing unit dimensional data WATER/GLYCOL Temperature Gauge Pressure Psig KPa R407C RefrigerantCalculating Subcooling Temperature Pressure Gauge Psig KPaExample Page Ne t Ppor t Is tTwor k Care
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3000 specifications

The Emerson 3000 is a cutting-edge control system designed to enhance the efficiency, reliability, and precision of industrial operations. Employed across various sectors such as oil and gas, pharmaceutical, food and beverage, and power generation, the Emerson 3000 has gained recognition for its robustness and versatility.

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