Liebert 3000 Centrifugal Air Cooled Condensing Units, Installing the Indoor Condensing Unit

Page 58

Split System Models

7.5Centrifugal Air Cooled Condensing Units

7.5.1Installing the Indoor Condensing Unit

Refer to drawings for unit dimensions and component locations.

! WARNING

Be sure the supporting roof structure is capable of supporting the weight of the unit(s) and the accessories during installation and service. (See Table 30 - Indoor centrifugal condensing unit.)

Be sure to securely anchor the top ends of the suspension rods. Make sure all nuts are tight.

The indoor condensing unit is usually mounted above the ceiling and must be securely mounted to the roof structure. The ceiling and ceiling supports of existing buildings may require reinforcements. Be sure to follow all applicable codes. Use field-supplied threaded suspension rods and

3/8"-16 factory hardware kit.

Recommended clearance between ceiling grids and building structural members is unit height plus three inches.

Install the four field-supplied rods by suspending them from suitable building structural members. Locate the rods so that they will align with the four mounting holes in the flanges that are part of the unit base.

Using a suitable lifting device, raise the unit up and pass the threaded rods through the four mount- ing holes in the flanges that are part of the unit base.

Attach the threaded rods to the unit flanges using the supplied nuts and grommets. (See Figure 25 - Detail of ceiling hanging bracket, Threaded Rod and Hardware Kit Installation). The rubber grommets provide vibration isolation.

1.Use the plain nuts to hold unit in place. Adjust these nuts so that the weight of the unit is supported evenly by the four rods, does not rest on the ceiling grid, and is level.

NOTE

The units must be level in order to operate properly.

2. Use the Nylock nuts to “jam” the plain nuts.

Table 30 Indoor centrifugal condensing unit

Model

Net Weight

 

 

60 Hz

50 Hz

lbs (kg)

 

 

 

MC_40A

MC_39A

240 (109)

 

 

 

MC_65A

MC_64A

449 (204)

 

 

 

MC_44W

MC_43W

190 (86)

 

 

 

MC_69W

MC_68W

282 (128)

 

 

 

52

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Contents Liebert Challenger Page Table of Contents Split System Models Chilled Water ModelsR407C Refrigerant Figures Tables System Descriptions Location Considerations Room PreparationEquipment Inspection Equipment HandlingRemoval of Skid Unit net weightModel Lbs kg Rear return configuration Front return configurationFloor Cutout Dimensions Drain Line Piping ConsiderationsPiping connection size Hot GasRefrigerant Line Condensate Pump Line HumidifierWater SupplyLineSuction Refrigerant Line Condensate DrainHotWater Return Condenser SupplyLineCondenser Return Line HumidifierWater SupplyLine Hot Water SupplyPiping connections for chilled water self-contained units Installation Electrical Connections Electrical connectionsHz Units 550 600 Model Balancing the Air DistributionUnder-Floor Discharge Systems Ton Hz Units 550 600 ModelPlenum Installation Checklist for Completed InstallationDucted Applications Installation Low Voltage Condenser LocationLine Voltage Lee-Temp/Flood Back Head Pressure Control CondensersAir cooled condenser statistics Refrigerant Piping Recommended line sizes OD copper inchesEquivalent lengths feet for various pipe fittings Fan Speed Control SystemsMaterials Supplied Condenser refrigerant per serial tagDehydration/Leak Test Single Circuit Shown Charging Refrigerant control settings psi kPaLee-Temp/Flood Back Head Pressure Control Systems PipingMaterials Supplied Low Pressure Cut Out High Pressure Cut Out 360 Single Circuit Shown Condenser Water cooled general arrangement Water Regulating Valve AdjustmentManual Flushing Testing Valve Function Adjusting collar nutDrycooler Location Drycooler InstallationPump and Drycooler Glycol Piping Room dew point temperaturesDry Bulb Wet Bulb Relative Dew Point Humidity Expansion Tanks, Fluid Relief Valves and Other Devices Volume in standard Type L copper pipingFilling Instructions Preparing the System for FillingEthylene glycol concentrations Glycol Solutions@ 50F 10C Filling the System See Note 30-1/4 For expansion tank dimensions, see on43-3/16 43-9/16 110 5mm 1095mm 483mm 1097mmGlycol pump data Mounting hole dimensional dataDrycooler data Pump Pump Suction Pump Discharge ConnectionFactory Glycool general arrangement Glycol Regulating Valve Chilled Water Models WAY Valve Air Cooled Condensing Units Water/Glycol Cooled Condensing UnitsRefrigerant Loop Recommended refrigerant lines R22 or R407C sizes OD copper Unit refrigerant chargeLine coupling sizes Refrigerant piping diagram 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 SL-11081 PG 8A Discharge ModelsCentrifugal Air Cooled Condensing Units Installing the Indoor Condensing UnitModel Net Weight 60 Hz 50 Hz Lbs kg Indoor centrifugal condensing unitDetail of ceiling hanging bracket Airflow CFM CMH DuctingTon Dimensional Data Piping Connections DPN000207Rev0 Ton centrifugal air cooled condensing unitTon centrifugal air cooled condensing unit dimensional data DPN000226Rev0 Water Cooled Condenser Water Requirements Water and Glycol Cooled Condensing UnitsPiping Considerations Regulating ValvePiping Connections DPN000209Rev0 Ton water/glycol cooled condensing unit dimensional data DPN000228Rev0 Temperature Gauge Pressure Psig KPa R407C RefrigerantCalculating Subcooling Temperature Pressure Gauge Psig KPaExample R407C Refrigerant R407C Refrigerant Page Tin NetIti That
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