Model YCAV Air-Cooled Screw Compressor Liquid Chillers Style A

Specifications - continuedFORM 201.21-EG1 (711)output to stay online and avoid safety limits beingreached. This allows maximum possible cooling capacityuntil the unusual condition is cleared and avoidscostly shutdowns. The system monitors the followingparameters and maintains the maximum cooling outputpossible without shutdown of the equipment: motorcurrent, suction pressure and discharge pressure.• System Safeties are provided for individual compressorsystems to perform auto-reset shut down (manualreset required after the third trip in 90 minutes). Safetiesinclude: high discharge pressure or temperature,low suction pressure, high / low motor current, highmotor temperature, high pressure switch, high / lowdifferential oil pressure, high oil temperature, low suctionsuperheat, critical sensor malfunction, low or highcurrent, phase loss/single phase power, overload ofmotor windings, and low voltage.• Unit Safeties are provided for the chiller to performauto-reset shut down for the following conditions: highor low ambient, low leaving chilled liquid temperature,under voltage, and flow switch operation.COMPLETE FACTORY PACKAGE• These air-cooled chillers are shipped as a completefactory package. Each unit is completely assembledwith all interconnecting refrigerant piping and internalwiring, ready for field installation:• Each compressor is installed on its own independentrefrigerant circuit, which is factory pressure tested,evacuated, then fully charged with R134a refrigerantand oil.• After assembly, an operational test is performed withwater flowing through the cooler to ensure each circuitoperates correctly.• Unit panels, structural elements, control boxes andheavy gauge structural base shall be constructedof galvanized steel. Unit panels, control boxes andstructural base are finished with baked-on powderpaint. All painted surfaces shall be coated with bakedon powder paint which, when subject to ASTMB117,1,000 hour, 5% salt spray test, yields minimum ASTM1654 rating of “6”.• The chiller's design is in accordance with applicablesections of ASME Pressure Vessel Code, NFPA 70(National Electrical Code), UL and cUL Standardsand ASHRAE/ANSI-15 Safety Code for MechanicalRefrigeration.• These units are rated (all) and certified (140 - 200 tons[492- 703 kW]) in accordance with AHRI Standard550/590-98.• All exposed power wiring is routed through liquid-tight,UV-stabilized, non-metallic conduit.6JOHNSON CONTROLS