Liebert ITR Centrifugal Air-Cooled Condensing Units, Installing the Indoor Condensing Unit

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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

Risk of structure collapse. Can cause equipment damage, injury or death.

Before beginning installation, make sure that the supporting roof structure is capable of supporting the weight of the unit(s) and the accessories during installation and service. (See Table 28 - 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 23 - 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 28 Indoor centrifugal condensing unit

Model		Net Weight
		Net Weight
60 Hz	50 Hz	lb (kg)

MC_65A	MC_64A	449 (204)

MC_69W	MC_68W	282 (128)

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Contents

Liebert Challenger ITR Page Table of Contents Chilled Water Models Split System ModelsR407C Refrigerant Figures Tables System Descriptions Equipment Inspection Remote Sensor Installation LocationRoom Preparation Location ConsiderationsRemoval of Skid Unit shipping weightsHandling With Skid Domestic Export Model Lb kg 50Hz Models 60Hz ModelsCabinet dimensions Unit WeightSL-11897 Piping Considerations Drain LinePiping connection size Piping Outlet Locations Piping connections for split system fan coil units Piping connections for water/glycol and Glycool units Piping connections for chilled water self-contained units Electrical Connections Electrical connectionsPlenum Installation Balancing the Air DistributionDucted Applications Checklist for Completed Installation Low Voltage Condenser LocationLine Voltage Lee-Temp/Flood Back Head Pressure Control CondensersAir-cooled condenser statistics 23 & 33 kW 067A 065A Refrigerant PipingRecommended line sizes OD copper inches Equivalent Length Hot Gas Line Liquid LineEquivalent 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 Water Regulating Valve AdjustmentTesting Valve Function Water Regulating Valve Manual FlushingDrycooler Installation Drycooler LocationPump and Drycooler Expansion Tanks, Fluid Relief Valves and Other Devices Room dew point temperaturesGlycol Piping Dry Bulb Wet Bulb Relative Dew Point HumidityFilling Instructions Indoor unit glycol volume approximate gallons liters maxVolume in standard Type L copper piping Preparing the System for FillingGlycol Solutions Ethylene glycol concentrations@ 50F 10C Filling the System See Note 30-1/4 For expansion tank dimensions, see on43-9/16 110 5mm 483mm 43-3/16 1097mmGlycol pump data Mounting hole dimensional dataDrycooler data Pump Pump Suction Pump Discharge ConnectionGlycol general arrangement Glycool general arrangement Glycol Regulating Valve Adjustment Glycol Regulating ValveChilled Water Models Air-Cooled Condensing Units Water/Glycol-Cooled Condensing UnitsRefrigerant Loop Unit refrigerant charge Recommended refrigerant lines R22 or R407C sizes OD copperLine coupling sizes Evaporator Evaporator Condensing UnitQuick Connect Fittings Unit Dimensions See Table Outdoor Air-Cooled Condensing Units PFH067A-L Outdoor air-cooled condensing unit-top air discharge models See TablePiping and electrical connections top air discharge 36-1/4 38-1/2152 Electrical field connections, prop fan condensing module SL-11081 PG 8ACentrifugal Air-Cooled Condensing Units Installing the Indoor Condensing UnitModel Net Weight 60 Hz 50 Hz Lb kg MC65A MC64A Indoor centrifugal condensing unitDucting Airflow CFM CMHCentrifugal air-cooled condensing unit dimensional data AIR Cooled Water Cooled Piping Considerations Regulating Valve Adjustment and TestingWater and Glycol-Cooled Condensing Units Condenser Water RequirementsWater/glycol-cooled condensing unit dimensions WATER/GLYCOL Temperature Gauge Pressure Psig KPa R407C RefrigerantTemperature Pressure Gauge Psig KPa Calculating SubcoolingExample Ti n Ne tIti That