GENERAL DESCRIPTION A. Packaged centrifugal chiller including the following: evaporator, motor and compressor, capacity control device, condenser with integral sub cooler, refrigerant metering device, lubrication system, motor starter, control panel with user interface, and – if required – a refrigerant purge system. B. Provide chiller utilizing an HFC refrigerant that has an Ozone Depletion Potential (ODP) of ZERO, and that has no refrigerant production phase-out date and no phase out date for equipment that uses that refrigerant. C. Provide chiller to meet or exceed the scheduled performance within the limits of the scheduled parameters. D. Neoprene vibration isolation pads (for slab-on-grade or basement installations): provide four neoprene pads 7/8” thick (minimum) bonded to a steel plate for each support point. E. Refrigerant isolation valves: two butterfly valves, one on the compressor discharge line and one on the liquid line. 2.03 HEAT EXCHANGERS A. General requirements: evaporator and condenser 1. Heat exchanger type: a. Evaporator: Shell and tube, hybrid falling film design b. Condenser: Shell and tube, flooded design 2. Construct in accordance with the current ANSI/ASHRAE-15 Safety Code for Mechanical Refrigeration and ASME Pressure Vessels Code and shall bare the ASME stamped nameplate. 3. Shells: Carbon steel with fusion welded seams 4. Tubes: Internally rifled, externally enhanced, individually cleanable and individually replaceable from either chiller end, and roller expanded into tube sheets. 5. Tube supports: Carbon steel, 3/8” thick minimum, no more than 4 feet apart, selfsupporting and welded to the shell. 6. End sheets: Carbon steel, 1” thick minimum. 7. Water boxes: Steel, bolted to end sheet, cover plate bolted to box, taps for vent and drain. 8. Pressure Relief: automatically reseating relief valves. Rupture discs are not acceptable. B. Evaporator 1. Waterside working pressure: 150 psig 2. Water boxes: Compact (end nozzle locations)with grooved connections 3. Tubes: Copper, removable from either end, minimum tube wall thickness of 0.035” at the plain lands contacting the intermediate tube supports and end sheets. 4. Suction baffle: Installed along the entire length of the evaporator. 5. Sight glass: Located such that the proper refrigerant charge is near the center of the glass when the machine is off. C. Condenser 1. Waterside working pressure: 150 psig 2. Water boxes: Compact (end nozzle locations) with grooved connections.
