Liebert 3000 installation manual Dehydration/Leak Test

Page 26

Air Cooled Models

3.4.2Dehydration/Leak Test and Charging Procedures for R22 (standard) or R407C (Optional) Fan Speed Control Type Condenser

! 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.

Dehydration/Leak Test

1.Make sure unit is OFF. Open all disconnects and remove all fuses except control fuses. On units supplied with circuit breakers, open all breakers except for the transformer.

2.Add a jumper to the Fan Safety Switch between Common and Normal Open and disconnect the wire connected to the Normally Closed. Turn unit disconnect ON. (Fan operation not required.)

NOTE

The above allows the technician to use unit 24 VAC power and controls to open liquid line solenoid valve(s) and hot gas bypass solenoid valve(s) for the dehydration process. If no power is at the unit disconnect, the technician is to use a separate 24 VAC source rated at 75 VA and connect to the system liquid line solenoid valve(s) and hot gas bypass solenoid valve(s) directly.

3.Connect refrigeration gauges to the suction and discharge service valves of the compressor. Open all compressor service valves.

4.To energize the liquid line solenoid valves through the control system power, set the control temperature setpoint (see operation manual) to 60°F (15°C) and set the % relative humidity setpoint higher than the conditioned room ambient to ensure that solenoid valves and hot gas bypass valves are open during the dehydration process.

5.Pressurize the system circuit(s) to 150 PSIG (1034 kPa) by using dry nitrogen with a trace of refrigerant. Check system for leaks with suitable leak finder.

6.After completion of leak testing, release the test pressure (per local code) and pull a deep vacuum on the system with a suitable pump.

7.After four hours, check the pressure readings, and if they have not changed, break vacuum with refrigerant. Pull another vacuum to 250 microns or less. Recheck the pressure after two hours. After completing this step, pressurize the circuits with refrigerant (R407C liquid or R22 vapor per unit nameplate) until suction and discharge pressures have equalized.

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Contents Liebert Challenger Page Table of Contents R407C Refrigerant Chilled Water ModelsSplit System Models Figures Tables System Descriptions Location Considerations Room PreparationEquipment Inspection Equipment HandlingModel Lbs kg Unit net weightRemoval of Skid Rear return configuration Front return configurationFloor Cutout Dimensions Piping connection size Piping ConsiderationsDrain Line 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 ModelDucted Applications Checklist for Completed InstallationPlenum Installation 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 Manual Flushing AdjustmentWater Regulating Valve Testing Valve Function Adjusting collar nutPump and Drycooler Drycooler InstallationDrycooler Location Dry Bulb Wet Bulb Relative Dew Point Humidity Room dew point temperaturesGlycol Piping Expansion Tanks, Fluid Relief Valves and Other Devices Volume in standard Type L copper pipingFilling Instructions Preparing the System for Filling@ 50F 10C Glycol SolutionsEthylene glycol concentrations 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 Line coupling sizes Unit refrigerant chargeRecommended refrigerant lines R22 or R407C sizes OD copper 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 Table152 Piping and electrical connections top air discharge36-1/4 38-1/2 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 Ton DuctingAirflow CFM CMH 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 RefrigerantExample Temperature Pressure Gauge Psig KPaCalculating Subcooling R407C Refrigerant R407C Refrigerant Page Tin NetIti That
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3000 specifications

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