Liebert® Challenger™ 3000 with Liebert iCOM® - Emerson Network ...

Guide Specifications—Nominal 3 or 5 ton Environmental Control SystemHot Gas Reheat (Optional)The complete hot gas reheat system shall include a copper tube, aluminum fin coil, three-waysolenoid valve, and refrigerant check valve. The capacity of the coil shall be _____ BTU/HR (kW).Outdoor UnitPropeller Fan Drycooler (Standard)The Liebert manufactured drycooler shall be the low profile, slow speed, direct drive propeller fantype. The drycooler shall be constructed of aluminum and contain a copper tube aluminum fin coilwith an integral electric control panel. The drycooler shall be designed for _____ °F (°C) ambient.Single Glycol Pump Package (Standard)This system shall be provided with a centrifugal pump mounted in a weatherproof and ventedenclosure. The pump shall be rated for _____ GPM (l/s) at _____ ft. of head (kPa), and operate on _____Volt, 3 phase, _____ Hz.Dual Glycol Pump Package (Optional)The dual pump package shall include pumps, enclosure, and field mounted flow switch. The pumpsshall be wired to the drycooler control box which includes a lead/lag switch for the pumps. Thestandby pump shall automatically start upon failure of the lead pump. Each pump shall be rated_____ for GPM (l/s) at _____ feet of head (kPa).2.3.7 GLYCOOL Self-Contained SystemsGLYCOOL CoilThe GLYCOOL coil shall be constructed of copper tubes and aluminum fins and be located upstreamof the evaporator coil. The GLYCOOL coil shall be designed for closed-loop applications usingproperly treated glycol solutions. The coil shall be rated at _____ BTU/HR (kW) sensible coolingcapacity with a _____ F (°C) entering glycol solution temperature. The GLYCOOL coil shall require_____ GPM (l/s) and the total unit pressure drop shall not exceed _____ feet of water (kPa) when in thefree-cooling mode.3-Way GLYCOOL ValveThe GLYCOOL coil shall be equipped with a fully proportional 3-way control valve. This motorizedcontrol valve shall control the amount of flow to the GLYCOOL coil and maintain constanttemperature and relative humidity.Glycol CondenserThe glycol system shall be equipped with a coaxial condenser having a total pressure drop of _____feet of water (kPa) and a flow rate of _____ GPM (l/s), with _____ °F (°C) entering 40% ethylene glycoltemperature.3-Way Water Regulating Valve—(Standard)The condenser circuit shall be pre-piped with a head pressure actuated 3-way water regulating valve.Motorized Ball Valve—(With Optional Digital Scroll Compressor)Discharge pressure on digital scroll units shall be controlled by a motorized ball valve. Duringunloaded operation, the pressure changes during each digital cycle could result in excessiverepositions with a pressure operated water regulating valve. The control algorithm for the motorizedball valve uses an intelligent sampling rate and adjustable pressure thresholds to reduce valverepositions. The valve assembly consists of the brass valve, linkage and actuator.Design PressureThe GLYCOOL coil/condenser circuit with a water regulating valve and standard scroll compressorshall be designed for a pressure of [(150PSI (1034 kPa)) or (300PSI (2069 kPa))]. The GLYCOOLcoil/condenser circuit with a motorized ball valve and digital scroll compressor shall be designed for apressure of 300psi (2068kPa).62