Liebert 50 & 60Hz, 8 Tons user manual Optional Equipment Piping

Page 39

Site Preparation and Installation

2.8Optional Equipment Piping

2.8.1Free-Cooling Coil (GLYCOOL)

The free-cooling coil is a secondary coil located upstream of the DX coil. To take maximum advantage of available free-cooling, the secondary coil may operate at the same time as the DX coil. A tempera- ture sensor is factory-mounted to the free-cooling piping. When fluid temperature is sufficiently below the room temperature, cooling is provided by circulating the fluid through the secondary cooling coil (flow is controlled by a motorized valve). Compressors are staged on if needed to supplement the free- cooling. To keep deposits from building up in the free-cooling coil, the coil is flushed periodically.

NOTE

If the free-cooling coil is piped to an open water tower, a CU/NI (cupro-nickel) type coil must be ordered to prevent corrosion of the copper tubes; or a heat exchanger must separate the tower water from the free-cooling loop.

On water-cooled systems, the free-cooling coil outlet can be field piped to the condensing unit inlet, provided a 3-way regulating valve has been installed within the water/glycol condensing unit (see Figure 21).

Figure 21 Optional free cooling coil (3-way valve) on water/glycol units

SL-11088Pg12

31

Image 39

Contents Liebert Mini-Mate2 Page Table of Contents System Performance Microprocessor Controls Microprocessor ControlSystem OPERATION, TESTING, and Maintenance AlarmsFigures Table iv Heat rejection matchup 50 Hz Table iii Heat rejection matchup 60 HzPage Standard Product Features Optional Equipment Ancillary Ship Loose Accessories Application limits, evaporator and chilled-water units Installation ConsiderationsInput Voltage Entering Fluid Temperature Min Room PreparationLocation Considerations Drycooler Evaporator System Weights Unit weightsEquipment Inspection upon receipt Installing the Evaporator or Chilled-Water Units NylockLocking nut Hex nut Nut Clamps are for shipping purposes only Close Coupled InstallationsHp Motor std Hp Motor opt Turns External Open Evaporator Air Distribution Filter BoxConnections for Ducted Systems Evaporator external static pressure 60 at 3750 CFM 6371 CMHPiping Connections and Coolant Requirements Drain Line Drain installationHumidifier Water Supply Line Condensate PumpChilled-Water Piping-Chilled-water Systems Only General arrangement diagram chilled-water systemsRefrigerant R-22 Piping Recommended refrigerant line sizesEquivalent Suction Feet Circuit Liquid Line Line charges field piping Total refrigerant = Units and LinesQuick Connect Fittings Ton unit refrigerant chargeOptional Filter BOX Electrical Connections, Evaporator or Chilled-Water Unit Power ConnectionsFront of Unit Evaporator unit electrical connectionsDucting General ConsiderationsConsiderations for Specific Applications Piping Connections Electrical Connections Condensing UnitControl Connections DPN000248Rev1 Heat rejection connection. Field Electrical Connections Outdoor Air-Cooled Condensing Unit InstallationEarth ground connection Electric service connectionHigh voltage Low voltageFootprint Dimensions 11-1/2 152292 Water/Glycol Piping Considerations Condensing Unit Fluid RequirementsRegulating Valve Indoor water/glycol condensing unit dimensional data Site Preparation and Installation Two circuits provided. Single circuit shown Optional free cooling coil 3-way valve on water/glycol units Optional Equipment PipingOptional free cooling coil 3-way valve on air-cooled units Checklist for Completed Installation Wall box Feature OverviewMain Menu Menu Setpoints Active AlarmsAlarm History Default setpoints and allowable rangesDate Setup OperationRestart Time Delay TimeLead Compressor Show DIP Switch10.2 C/F Degrees Humidity Control MethodCalibrate Sensors Change PasswordsAlarm Enable Setup functions, default values and allowable rangesAlarm default time delays Alarm Time DelayCommon Alarm Enable Custom AlarmsNonvolatile Memory Equipment Options SwitchesCustom Text LCD Display ContrastRun Diagnostics Test OutputsTest Inputs Test Micro TB3-2 Connection to Terminal #2 Wallbox TB3-1 TB3-2 TB3-3 TB4-4 Wall Box DIP SwitchesTB3-4 Connection to Terminal #4 Wallbox TB3-3 Connection to Terminal #3 WallboxControl Type Response Proportional Control CoolingReheat Humidification Operation System Activation Load Control FeaturesDehumidification / Humidification Percent Required CommunicationsAir-Cooled Systems Alarms Definitions and TroubleshootingCustom Alarms High Head PressureLoss of Power TemperatureHumidifier Problem Alarm High-Water AlarmChange Filter Optional/Custom AlarmsSystem Testing Maintenance and Component Operation Thermostatic Expansion Valve Refrigeration SystemSuction Pressure Discharge PressureGlycol Solution Maintenance Regulating Valves Water/Glycol Condensing UnitsHot Gas Bypass Optional Replacement Procedures Steam Generating Humidifier Operation Procedures Amps Circuit Board AdjustmentsHumidifier control board DIP switch settings Replacing the Humidifier CanisterMaintenance Inspection Checklist Troubleshooting Control pads Symptom Possible Cause Check or Remedy Cooling cycle tooShort Display freezesTroubleshooting Troubleshooting Troubleshooting Page That NetIti Tin