Liebert 3000 installation manual Refrigerant Piping, Recommended line sizes OD copper inches

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Air Cooled Models

3.3Refrigerant Piping

All refrigeration piping should be installed with high temperature brazed joints. Prevailing good refrigeration practices should be employed for piping supports, leak testing, dehydration and charg- ing of the refrigeration circuits.

Unit refrigeration components and piping are shipped from the factory with a nitrogen holding charge.

NOTE

The refrigeration piping should be isolated from the building by the use of vibration isolating supports.

NOTE

Piping, including inverted trap(s), must be routed to allow unobstructed access to the panel per the NEC.

NOTE

When installing field piping, care must be taken to protect all refrigerant lines from the atmosphere, especially when using refrigerants with POE oils. Do not allow the piping to stand open to air for more than 15 minutes. Units designed for R407C have a compressor that contains POE oil that is very hygroscopic; that is, it quickly absorbs water from the air. The longer the compressor piping is left open to air, the harder it will be to fully evacuate. If left open too long, the POE oil may need to be replaced before achieving the required vacuum level.

NOTE

Keep the evaporator unit and condenser closed with their factory charge of dry nitrogen while all field piping is installed. Keep the field piping clean and dry during installation, and do not allow it to stand open to the atmosphere. When all the field interconnecting piping is in place, vent the condenser dry nitrogen charge and connect to the field piping. Finally, vent the evaporator unit dry nitrogen charge and make its piping connections last.

Follow all proper brazing practices including a dry nitrogen purge to maintain system cleanliness.

Traps should be installed in the hot gas line on vertical risers at the base and every 25 feet (7.6 meters) in elevation. These traps will collect condensed refrigerant and refrigerant oil during the off cycle of the unit and ensure flow of refrigerant oil during operation.

A check valve is factory-supplied with the unit to be field-installed on the discharge side of the scroll compressor. Be sure to install the check valve with the refrigerant flow in the proper direction. When soldering or brazing the valve, it is very important to protect the internal parts by wrapping the valve with a damp cloth to keep the valve temperature below 250°F (121°C).

Approval is required whenever:

•a refrigerant piping run exceeds 150 ft (46 m) equivalent length

•an R22 system condenser must be located more than 15 ft (4.6 m) below the level of the cooling coil

•an R407C system condenser must be located below the level of the cooling coil.

Total discharge line pressure drop must not exceed 10 PSIG (69 kPa).

Consult your local Liebert representative when considering installations outside these guidelines.

Table 5 Recommended line sizes — OD copper (inches)*

 

3.5 Ton 042A (040A)

5 Ton 067A (065A)

Equivalent Length

Hot Gas Line

Liquid Line

Hot Gas Line

Liquid Line

50 ft. (15 m)

5/8

1/2

7/8

1/2

100 ft. (30 m)

3/4

1/2

7/8

5/8

150 ft. (45 m)

3/4

5/8

7/8

5/8

*Recommended vertical line sizes must be used for proper oil return at all cooling and dehumidification steps.

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Contents Liebert Challenger Page Table of Contents Chilled Water Models Split System ModelsR407C Refrigerant Figures Tables System Descriptions Room Preparation Equipment InspectionLocation Considerations Equipment HandlingUnit net weight Removal of SkidModel Lbs kg Rear return configuration Front return configurationFloor Cutout Dimensions Piping Considerations Drain LinePiping connection size Hot GasRefrigerant Line HumidifierWater SupplyLine Suction Refrigerant LineCondensate Pump Line Condensate DrainCondenser SupplyLine Condenser Return LineHotWater Return HumidifierWater SupplyLine Hot Water SupplyPiping connections for chilled water self-contained units Installation Electrical Connections Electrical connectionsBalancing the Air Distribution Under-Floor Discharge SystemsHz Units 550 600 Model Ton Hz Units 550 600 ModelChecklist for Completed Installation Plenum InstallationDucted Applications Installation Condenser Location Line VoltageLow Voltage Lee-Temp/Flood Back Head Pressure Control CondensersAir cooled condenser statistics Refrigerant Piping Recommended line sizes OD copper inchesFan Speed Control Systems Materials SuppliedEquivalent lengths feet for various pipe fittings Condenser refrigerant per serial tagDehydration/Leak Test Single Circuit Shown Refrigerant control settings psi kPa Lee-Temp/Flood Back Head Pressure Control SystemsCharging PipingMaterials Supplied Low Pressure Cut Out High Pressure Cut Out 360 Single Circuit Shown Condenser Water cooled general arrangement Adjustment Water Regulating ValveManual Flushing Testing Valve Function Adjusting collar nutDrycooler Installation Drycooler LocationPump and Drycooler Room dew point temperatures Glycol PipingDry Bulb Wet Bulb Relative Dew Point Humidity Volume in standard Type L copper piping Filling InstructionsExpansion Tanks, Fluid Relief Valves and Other Devices Preparing the System for FillingGlycol Solutions Ethylene glycol concentrations@ 50F 10C Filling the System For expansion tank dimensions, see on 43-3/16 43-9/16 110 5mmSee Note 30-1/4 1095mm 483mm 1097mmMounting hole dimensional data Drycooler dataGlycol pump 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 Unit refrigerant charge Recommended refrigerant lines R22 or R407C sizes OD copperLine 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 TablePiping and electrical connections top air discharge 36-1/4 38-1/2152 SL-11081 PG 8A Discharge ModelsInstalling the Indoor Condensing Unit Model Net Weight 60 Hz 50 Hz Lbs kgCentrifugal Air Cooled Condensing Units Indoor centrifugal condensing unitDetail of ceiling hanging bracket Ducting Airflow CFM CMHTon Dimensional Data Piping Connections DPN000207Rev0 Ton centrifugal air cooled condensing unitTon centrifugal air cooled condensing unit dimensional data DPN000226Rev0 Water Cooled Water and Glycol Cooled Condensing Units Piping ConsiderationsCondenser Water Requirements Regulating ValvePiping Connections DPN000209Rev0 Ton water/glycol cooled condensing unit dimensional data DPN000228Rev0 Temperature Gauge Pressure Psig KPa R407C RefrigerantTemperature Pressure Gauge Psig KPa Calculating SubcoolingExample R407C Refrigerant R407C Refrigerant Page Net ItiTin That
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3000 specifications

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