GENERAL
The 47 - 60 Ton (165 - 210 kW) YCAL models are shipped complete from the factory ready for installation and use.
The unit is pressure-tested, evacuated, and fully charged with Refrigerant-22 (HCFC-22) and includes an initial oil charge. After assembly, a complete operational test is performed with water flowing through the cooler to assure that the refrigeration circuit operates correctly.
The unit structure is heavy-gauge, galvanized steel. This galvanized steel is coated with baked-on powder paint, which, when subjected to ASTM B117 1000 hour, salt spray testing, yields a minimum ASTM 1654 rating of “6”. Corrosion resistant wire mesh panels are added to protect the condenser coil from incidental damage and restrict unauthorized access to internal components. Units are designed in accordance with NFPA 70 (Na- tional Electric Code), ASHRAE/ANSI 15 Safety code for mechanical refrigeration, ASME, Listed and labeled with Intertek Testing Services (ETL) and rated in accordance with ARI Standard 550/590-2003.
COMPRESSORS
The chiller has suction-gas cooled, hermetic, scroll com- pressors. The YCAL compressors incorporate a compli- ant scroll design in both the axial and radial direction. All rotating parts are statically and dynamically balanced. A large internal volume and oil reservoir provides greater liquid tolerance. Compressor crankcase heaters are also included for extra protection against liquid migration.
COOLER
The cooler is equipped with a heater controlled by a separate thermostat. The heater provides freeze protec-
tion for the cooler down to -20°F (-29°C) ambient. The cooler is covered with 3/4” (19mm) flexible, closed-cell, foam insulation (K~0.25).
Brazed plate heat exchangers shall be UL (Underwriters Laboratories) listed. Installing contractor must include accommodations in the chilled water piping to allow proper drainage and venting of the heat exchanger. Water inlet and outlet connections are grooved for com- patibility with factory supplied victaulic connections.
A strainer with a mesh size between .5 and 1.5 mm (40 mesh) is recommended upstream of the heat exchanger to prevent clogging.
CONDENSER
Coils – Fin and tube condenser coils of seamless, inter- nally-enhanced, high-condensing-coefficient, corrosion resistant copper tubes are arranged in staggered rows, mechanically expanded into aluminum fins. Integral subcooling is included. The design working pressure of the coil is 450 PSIG (31 bar).
Low Sound Fans – The condenser fans are composed of corrosion resistant aluminum hub and glass-fiberrein- forced composite blades molded into a low noise airfoil section. They are designed for maximum efficiency and are statically and dynamically balanced for vibration free operation. They are directly driven by independent mo- tors, and positioned for vertical air discharge. All blades are statically and dynamically balanced for vibration-free operation. The fan guards are constructed of heavy- gauge, rust-resistant, PVCcoated steel wire.
Motors – The fan motors are Totally Enclosed Air-Over, squirrel-cage type, current protected. They feature ball bearings that are double-sealed and permanently lubricated.
