Liebert 3000 installation manual Piping Considerations, Refrigerant Loop

Page 49

Split System Models

7.3Piping Considerations

7.3.1 Refrigerant Loop

! CAUTION

All local codes for handling refrigerant must be followed.

NOTE

As R22 and R407C are similar in properties, proper safety equipment and proper refrigeration tools are required on both types. Check unit nameplate for correct refrigerant type before topping off or recharging a system.

NOTE

Refrigerant R407C uses a POE (polyol ester) lubricant. The R407C refrigerant must be introduced and charged from the cylinder only as a liquid.

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 which 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

Complete all piping and evacuate lines before connecting quick connects when using an optional sweat adapter kit and field installed hard piping.

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

All split systems require two refrigerant lines (an insulated copper suction line and a copper liquid line) between the evaporator and the condensing unit.

Two possible methods exist for installing the copper suction and liquid lines.

1.Using an optional Sweat Adapter Kit and hard piping between the two units.

2.Using optional pre-charged line sets (for 3 ton R22 models only).

All refrigeration piping should be installed with high temperature brazed joints. Prevailing good refrigeration practices should be employed for piping supports, leak testing, evacuation, dehydration, and charging of the refrigeration circuits. The refrigeration piping should be isolated from the build- ing by the use of vibration isolating supports.

It is important to handle the pre-charged lines for 3 ton units with care so they will not get kinked or damaged. Use tube benders and make all bends before making connections to either end. Coil any excess tubing in a horizontal plane with the slope of the tubing toward the condensing unit.

To prevent tube damage when sealing openings in walls and to reduce vibration transmission, use a soft flexible material to pack around the tubes.

When installing remote condensing units mounted above the evaporator, the suction gas line should be trapped at the evaporator. This trap will retain refrigerant oil in the off cycle. When the unit starts, oil in the trap is carried up the vertical riser and returns to the compressor.

Refrigerant charge requirements: Total refrigerant charge will be required only if units are evacuated during installation or maintenance. Total refrigerant charge = evaporator + lines + condensing unit.

NOTE

All condensing units and 3-ton evaporator units are fully charged with refrigerant. All 5 ton evaporator units include a nitrogen holding charge only. See Table 21 for field charge required. If field-supplied refrigerant piping is installed, refrigerant must be added to the system.

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Contents Liebert Challenger Page Table of Contents Split System Models Chilled Water ModelsR407C Refrigerant Figures Tables System Descriptions Equipment Inspection Room PreparationLocation Considerations Equipment HandlingRemoval of Skid Unit net weightModel Lbs kg Front return configuration Rear return configurationFloor Cutout Dimensions Drain Line Piping ConsiderationsPiping connection size Hot GasRefrigerant Line Suction Refrigerant Line HumidifierWater SupplyLineCondensate Pump Line Condensate DrainCondenser Return Line Condenser SupplyLineHotWater Return HumidifierWater SupplyLine Hot Water SupplyPiping connections for chilled water self-contained units Installation Electrical connections Electrical ConnectionsUnder-Floor Discharge Systems Balancing the Air DistributionHz Units 550 600 Model Ton Hz Units 550 600 ModelPlenum Installation Checklist for Completed InstallationDucted Applications Installation Line Voltage Condenser LocationLow Voltage Lee-Temp/Flood Back Head Pressure Control CondensersAir cooled condenser statistics Recommended line sizes OD copper inches Refrigerant PipingMaterials Supplied Fan Speed Control SystemsEquivalent lengths feet for various pipe fittings Condenser refrigerant per serial tagDehydration/Leak Test Single Circuit Shown Lee-Temp/Flood Back Head Pressure Control Systems Refrigerant control settings psi kPaCharging PipingMaterials Supplied Low Pressure Cut Out High Pressure Cut Out 360 Single Circuit Shown Condenser Water cooled general arrangement Water Regulating Valve AdjustmentManual Flushing Adjusting collar nut Testing Valve FunctionDrycooler Location Drycooler InstallationPump and Drycooler Glycol Piping Room dew point temperaturesDry Bulb Wet Bulb Relative Dew Point Humidity Filling Instructions Volume in standard Type L copper pipingExpansion Tanks, Fluid Relief Valves and Other Devices Preparing the System for FillingEthylene glycol concentrations Glycol Solutions@ 50F 10C Filling the System 43-3/16 43-9/16 110 5mm For expansion tank dimensions, see onSee Note 30-1/4 1095mm 483mm 1097mmDrycooler data Mounting hole dimensional dataGlycol pump data Pump Pump Suction Pump Discharge ConnectionFactory Glycool general arrangement Glycol Regulating Valve Chilled Water Models WAY Valve Water/Glycol Cooled Condensing Units Air Cooled Condensing UnitsRefrigerant Loop Recommended refrigerant lines R22 or R407C sizes OD copper Unit refrigerant chargeLine coupling sizes Refrigerant piping diagram Quick Connect Fittings Outdoor Air Cooled Condensing Units Unit Dimensions See TablePFCZ42A-L PFCZ41A-L See Table Outdoor air cooled condensing unit-top air discharge models36-1/4 38-1/2 Piping and electrical connections top air discharge152 Discharge Models SL-11081 PG 8AModel Net Weight 60 Hz 50 Hz Lbs kg Installing the Indoor Condensing UnitCentrifugal Air Cooled Condensing Units Indoor centrifugal condensing unitDetail of ceiling hanging bracket Airflow CFM CMH DuctingTon Dimensional Data Piping Connections Ton centrifugal air cooled condensing unit DPN000207Rev0Ton centrifugal air cooled condensing unit dimensional data DPN000226Rev0 Water Cooled Piping Considerations Water and Glycol Cooled Condensing UnitsCondenser Water Requirements Regulating ValvePiping Connections DPN000209Rev0 Ton water/glycol cooled condensing unit dimensional data DPN000228Rev0 R407C Refrigerant Temperature Gauge Pressure Psig KPaCalculating Subcooling Temperature Pressure Gauge Psig KPaExample R407C Refrigerant R407C Refrigerant Page Iti NetTin That
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