Water-Cooled Condensers - HTS

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Features and BenefitsLow Operating Costs -- High Efficiency OperationThe Daikin McQuay AGS chiller uses the Daikin McQuayscrew compressor design and large heat exchangers formaximum heat transfer. Generous heat transfer areatranslates into lower compressor pumping head andimproved efficiency. A single pass, direct expansionevaporator provides superior performance by providing truecounterflow heat transfer and low refrigerant and waterpressure drops.Superior Motor Control--Solid State Starters--Our StandardOfferingAGS chillers are the only units available that provide thesuperior motor control of solid-state starters as standard.The benefits are impressive.A primary benefit is that the compressors are startedslowly, requiring from three to seven seconds to go from astop to full-speed condition. This reduces vibration andcompressor stresses for longer life. If liquid refrigerant ispresent at the compressor intake, the slow accelerationeasily moves the liquid out without damaging thecompressor.Perhaps more important is the slow deceleration whenoperation is no longer required. The traditional jerkingand backward rotation allowed by conventional starters is eliminated with solid-state starters. Again,extended compressor life can be expected.Another great benefit is the superior electrical system monitoring. In the event of main electricalpower problems, the solid-state starters tightly monitor the power quality and make protectivedecisions to help prevent compressor motor damage. This includes the functions of phase andunder/over voltage protection and ground fault protection.Quiet Operation – “Building Friendly”Another feature that sets the Daikin McQuay chiller apart from other screw chillers is its low operatingsound levels. The primary reason for quiet operation is the compressor design itself. Daikin McQuay’scompressor design continues the philosophy of a single main rotor with two interlocked rotatinggaterotors with gas flow velocities and subsequent noise levels among the lowest available. Thiscompressor design is unique and proven by years of excellent service. Low sound levels allow greaterflexibility in unit placement near a building.AGS chiller sound data is published in this catalog for an easy comparison with other offerings. Seepage 44. Although others claim low sound levels, it is difficult to find their published sound data tosupport their claims.R-134a Refrigerant for Sustainable PerformanceAll Daikin McQuay WGS chillers use R-134a refrigerant. It has no ozone depletion potential and isconsidered a solution to refrigerant environmental issues. It is environmentally safe and does not have a4 WGS 130A – 190A Catalog WGS-1
phase-out date. It has the best toxicity and flame propagation rating under ASHRAE Std 34 safetystandard.User Friendly MicroTech II ControlsThe MicroTech II unit controller provides an easy-tousecontrol environment. The control logic is designedto provide maximum efficiency, to continue operation inunusual operating conditions, and to provide a historyof unit operation.Perhaps the greatest benefit is Daikin McQuay’s OpenChoice feature, which allows easy integration with yourbuilding automation system of choice using LONTALK,BACnet or Modbus standard protocols. See thecomplete control description on page 8 in this catalog.MicroTech II control uses distributed control, with eachrefrigerant circuit having a dedicated microprocessor.Distributed control architecture means that if anycompressor controller is unavailable, the remaining controllers are unaffected and their compressors willcontinue to operate. This feature can greatly enhance chiller reliability.Installation Savings for Retrofit ApplicationsAll WGS chillers will fit through a 36-inch-wide door (without sound enclosure). This attribute can meanconsiderable installation cost savings on many retrofit applications that may have access problems.Water-Cooled Condensers (AW Models)A separate water-cooled condenser is provided for eachrefrigerant circuit. They are cleanable, shell-and-tube typewith water in the tubes and refrigerant in the shell side. Eachcondenser circuit is capable of holding the circuit'srefrigerant charge and each circuit has its own charging andrelief valves. They are designed, constructed and tested inaccordance with the ASME Pressure Vessel Code. Optionalcondenser water manifolds (as shown on the right) areavailable to provide a single piping connection to the inletand outlet.The condensers are constructed with a carbon steel shell andseamless, integrally finned, high efficiency copper tubes, roller expanded into steel tubesheets. The waterheads are removable and have vent and drain connections at each end. Also included is a liquid shutoffvalve, purge valve, and relief valve per ANSI/ASHRAE Pressure Vessel Code, Section VIII.Water side working pressure is 225 psi (1551 kPa); refrigerant side is 350 psi (2413 kPa).Catalog WGS-1 WGS 130A – 190A 5
Page 1 and 2: Water-Cooled Screw Compressor Chill
Page 3: IntroductionThe WGS water-cooled sc
Page 7 and 8: Part Load EfficienciesPart load eff
Page 9 and 10: Superior discharge pressure control
Page 11: BACnet certification pendingProtoco
Page 15 and 16: Selection ProcedureNormally the req
Page 17 and 18: Performance Adjustment FactorsEthyl
Page 19 and 20: Performance DataWGS-AW Water-Cooled
Page 21 and 22: WGS-AW Part Load DataTable 10, Part
Page 23 and 24: Table 12, WGS 130AA - WGS 190AA, S.
Page 25 and 26: Table 14, WGS-AA Chillers Matched w
Page 27 and 28: Figure 9, Condenser Pressure Drop W
Page 29 and 30: Table 16, WGS 130AW - WGS 190AW, Wa
Page 31 and 32: Table 20, WGS 130AW - 190AW, Water-
Page 33 and 34: Table 22, WGS 130-190, Remote Conde
Page 35 and 36: Table 26, WGS 130AA - 190AA, Remote
Page 37 and 38: Field Wiring DiagramsFigure 10, WGS
Page 39 and 40: Physical DataWGS-AW, Water-CooledTa
Page 41 and 42: Dimensional DataWGS-AW Water-Cooled
Page 43 and 44: WGS-AA Remote CondenserFigure 14, D
Page 45 and 46: Figure 15, Sound EnclosureSound Red
Page 47 and 48: Water-cooled condensers can be pipe
Page 49 and 50: Table 33, Recommended Refrigerant P
Page 51 and 52: Optional FeaturesControls/Instrumen
Page 53 and 54: UnitSuction Shut-0ff ValvesA suctio
Page 55 and 56:
1.06 WARRANTYThe equipment manufact
Page 57 and 58:
D. Evaporator: The evaporator shall
Page 59 and 60:
Rubber-In-Shear OR spring vibration
Page 61 and 62:
1.06 WARRANTYThe equipment manufact
Page 63 and 64:
and have ANSI B9.1 pressure relief
Page 65 and 66:
All communication from the chiller
Page 68:
Daikin McQuay Training and Developm
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Water-Cooled Condensers - HTS

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