Liebert 3000 Lee-Temp/Flood Back Head Pressure Control Systems, Charging, Piping

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Air Cooled Models

3.4.3Charging

1.Make sure unit is OFF. Open all disconnect switches and, on units supplied with circuit breakers, open all breakers. Replace all fuses for the Fan and Compressors or close breakers.

2.Remove jumper on the Fan Safety Switch and reconnect the system wire connections. Ensure that all operational components are clear of debris. Turn unit ON. (Fan operation is required.) Check the evaporator fan for proper rotation and correct if necessary.

3.Connect the refrigerant gauge charging hose to the drum of refrigerant and to the suction and discharge service valves of the compressor.

4.Calculate the amount of charge for the system. Weigh in as much of the system charge as possible. Refer to the unit, condenser and refrigerant line charge tables.

5.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 charging procedure. You may have to bypass the

LP Switch (low pressure switch) to start the compressors and stop short cycling. Reset the Head Pressure switch(es) if open.

6.Add refrigerant (R407C liquid, or R22 vapor per unit nameplate) to the suction side of the compressor until there is sufficient pressure to energize the low-pressure switch.

NOTE

When adding refrigerant to an operating system, it may be necessary to add the refrigerant through the compressor suction service valve. Because the refrigerant leaving the refrigerant cylinder must be in a liquid state, care must be exercised to avoid damage to the compressor. It is suggested that a sight glass be connected between the charging hose and the compressor suction service valve. This will permit adjustment of the cylinder hand valve so that liquid can leave the cylinder while allowing vapor to enter the compressor.

Then you may remove the manual bypass you applied earlier.

7.Charge the unit until the liquid line sight glass becomes clear. Then add one additional pound of refrigerant.

8.As head pressure builds, the condenser fan starts rotating. The fan becomes fully energized when sufficient head pressure is developed. (Fan starts to rotate at 190 psi and is full speed at 250 psi.)

Table 10 Refrigerant control settings psi (kPa)

Low Pressure

Low Pressure

High Pressure

Cut Out

Cut In

Cut Out

 

 

 

20 (137.9)

65 (448.2)

360 (2482)

 

 

 

3.5Lee-Temp/Flood Back Head Pressure Control Systems

The Lee-Temp system consists of a modulating type head pressure control valve and insulated receiver with heater pad to ensure operation at ambient temperatures as low as -30°F (-34.4°C).

3.5.1Piping

Lee-Temp systems have two factory-supplied, field-installed check valves: one on the discharge side of the scroll compressor and one on the inlet side of the receiver. Be sure to install the check valves with the refrigerant flow in the proper direction. When soldering or brazing the valves, it is very important that the internal parts be protected by wrapping the valve with a damp cloth to keep the valve tem- perature below 250°F (121°C).

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Contents Liebert Challenger Page Table of Contents Split System Models Chilled Water ModelsR407C Refrigerant Figures Tables System Descriptions Room Preparation Equipment InspectionLocation Considerations 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 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 ModelPlenum Installation Checklist for Completed 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 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 Volume in standard Type L copper piping Filling InstructionsExpansion Tanks, Fluid Relief Valves and Other Devices Preparing the System for FillingEthylene glycol concentrations Glycol Solutions@ 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 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 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 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 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 RefrigerantCalculating Subcooling Temperature Pressure Gauge Psig KPaExample R407C Refrigerant R407C Refrigerant Page Net ItiTin That
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3000 specifications

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