Model YLAA Air-Cooled Scroll Compressor Liquid Chillers Style B

SpecificationsFORM 150.62-EG5 (509)GENERALThe 70 - 150 Ton (246 - 527kW) YLAA models are shippedcomplete from the factory ready for installation and use.The unit is pressure-tested, evacuated, and fully chargedwith a zero Ozone Depletion Potential Refrigerant R-410A and includes an initial oil charge. After assembly, acomplete operational test is performed with water flowingthrough the evaporator to assure that the refrigerationcircuit operates correctly.The unit structure is heavy-gauge, galvanized steel. Thisgalvanized steel is coated with baked-on powder paint,which, when subjected to ASTM B117 1000 hour, saltspray testing, yields a minimum ASTM 1654 rating of“6”. Units are designed in accordance with NFPA 70 (NationalElectric Code), ASHRAE/ANSI 15 Safety code formechanical refrigeration, ASME and rated in accordancewith ARI Standard 550/590.foam insulation (K=0.25).The water baffles are constructed of brass to resist corrosion.The removable heads allow access to the internallyenhanced, seamless, copper tubes. Vent and drain connectionsare included.Water inlet and outlet connections are grooved for compatibilitywith field supplied ANSI/AWWA C-606 couplings.CONDENSERCoils – Fin and tube condenser coils of seamless, internally-enhanced,high-condensing-coefficient, corrosionresistant copper tubes are arranged in staggered rows,COMPRESSORSThe chiller has suction-gas cooled, hermetic, scroll compressors.The YLAA compressors incorporate a compliantscroll design in both the axial and radial direction. All rotatingparts are statically and dynamically balanced. A large internalvolume and oil reservoir provides greater liquid tolerance.Compressor-crankcase heaters are also included for extraprotection against liquid migration.EvaporatorThe evaporator is equipped with a heater controlled bya separate thermostat. The heater provides freeze protectionfor the evaporator down to -20 o F (-29°C) ambient.The evaporator is covered with 3/4” flexible, closed-cell,jOHNSON CONTROLSmechanically expanded into aluminum fins. Integral subcoolingis included. The design working pressure of thecoil is 650 PSIG (45 barg).Fans – The condenser fans are composed of corrosionresistant aluminum hub and glass-fiber-reinforced polypropylenecomposite blades molded into a low-noise airfoilsection. They are designed for maximum efficiency andare statically and dynamically balanced for vibration-freeoperation. They are directly driven by independent motors,and positioned for vertical air discharge. The fan guardsare constructed of heavy-gauge, rust-resistant, coatedsteel. All blades are statically and dynamically balancedfor vibration-free operation.Motors – The fan motors are Totally Enclosed Air-Over, squirrel-cagetype, current protected. They feature ball bearingsthat are double-sealed and permanently lubricated.