Water-Cooled Condensers - HTS

eaker for each circuit.OPTION: The unit shall have single point power connection to a factoryinstalled,non-fused disconnect switch with through-the-door handle that isfactory wired to a compressor isolation circuit breaker for each circuit.OPTION: The unit shall have single point power connection to a factoryinstalled,high interrupt current rated, non-fused disconnect switch withthrough-the-door handle that is factory wired to a compressor isolation circuitbreaker for each circuit.OPTION: The unit shall have a high short circuit rated panel with single pointpower connection to a factory-installed, high interrupt current rated, non-fuseddisconnect switch with through-the-door handle that is factory wired to acompressor isolation circuit breaker for each circuit.The control system shall stage and load the compressors based on the leavingwater temperature. Equipment protection devices controlled by themicroprocessor shall include motor protection, high pressure, loss of refrigerant,loss of water flow, freeze protection, and low refrigerant pressure. Controlsshall include auto/stop switch, chilled water setpoint adjustment, anti-recycletimer, and digital display with water temperature and setpoint, operatingtemperatures and pressures, and diagnostic messages. The following featuresand functions shall be included:1. The control logic shall be designed to maximize operating efficiency andequipment life with protections for operation under unusual conditions.The system shall intelligently stage the unit to sustain leaving watertemperature precision and stability while minimizing compressor cycling.2. The following features and functions shall be included:a. Durable liquid crystal display (LCD) screen type, having minimum four20-character lines with 6 key input pad conveniently mounted on the unitcontroller. Default language and units of measure shall be English and I-P respectively. Messages shall be in plain English. Coded messages,LED indicators and LED displays are not acceptable.b. Remote reset of chilled water temperature using a 4-20mA signal.c. Soft-load operation, protecting the compressor by preventing full-loadoperation during the initial chilled fluid pull-down period.d. BAS communication flexibility through the Daikin McQuay OpenChoices feature. Optional modular plug-ins that enable the unitcontroller to communicate using standardized protocols such asLONTALK, MODBUS and BACnet.Factory mounted DDC controller(s) shall support operation on aBACnet®, Modbus® or LONMARKS ® network via one of the data link/ physical layers listed below as specified by the successful BuildingAutomation System (BAS) supplier. BACnet MS/TP master (Clause 9) BACnet IP, (Annex J) BACnet ISO 8802-3, (Ethernet) LONMARKS FTT-10A. The unit controller shall be LONMARKS ®certified.The information communicated between the BAS and the factorymounted unit controllers shall include the reading and writing of datato allow unit monitoring, control and alarm notification as specified inthe unit sequence of operation and the unit points list.For chillers communicating over a LONMARKS network, thecorresponding LONMARKS eXternal Interface File (XIF) shall beprovided with the chiller submittal data.64 WGS 130A – 190A Catalog WGS-1