YVAA Style A Air-Cooled Screw Liquid Chillers ... - Johnson Controls

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SECTION 2 - PRODUCT DESCRIPTION 14 INPUTS Pressure Transducers Temperature Sensors Switches Liquid Flow High Pressure Start/Stop Level Customer Supplied Contacts COMMUNICATIONS Building Automation Printer Modem 3 Phase Power Line Rectifier AC/DC Rectifier Rectifier Controller SCR Trigger Board Signal From Main Control Panel FIGURE 2 - CHILLER CONTROL SYSTEM An integral liquid cooled, transistorized, PWM, Variable Speed Drive (VSD) is controlled by the chiller microprocessor control panel to start/stop, select compressors to run, and select compressor speed. Displacement Power Factor is 0. 95 at part or full load. The chiller microprocessor communicates with the VSD Logic Board via a 3-wire RS-485 opto coupled data link. The VSD Logic Board runs the number of compressors required to meet the load and the compressors to the speed requested by the chiller microprocessor. CONTROL PANEL Chiller Control Board) Microprocessor User Interface Display and Keypad DISPLAY KEYPAD VSD Logic Board Power Driver (IGBT) IGBT Gate Driver PWM Signal OUTPUTS Relay Output Board) Solenoids Contactors Alarm Pump Compressor Heater Run Status Evaporator Heater VSD VSD Logic Board SCR Trigger Board Power Components PWM (Speed Control) Inverter MOTOR FORM 201.28-NM1.1 ISSUE DATE: 8/29/2012 Compressor 1 Compressor 2 LD15158 The basic system control and VSD system architecture is shown in Figure 2. SEMI-HERMETIC YORK TWIN-SCREW COMPRESSORS LD15028 Compressors are direct drive, semi-hermetic, rotary twin-screw type, including: muffler, temperature actuated ‘off-cycle’ heater, IP55 terminal board and precision machined cast iron housing. Reliable suction gas cooled, high efficiency, accessible hermetic compressor motor, full suction gas flow JOHNSON CONTROLS
FORM 201.28-NM1.1 ISSUE DATE: 8/29/2012 through mesh screen filter, with inherent internal thermal overload protection and external current overload on all three phases. Continuous function, microprocessor controlled, Variable Speed Drive (VSD) shall provide valve-less, smooth capacity control from 100% down to 10% of chiller capacity. In addition, elimination of the slide valve and associated unloading components has resulted in a 50% reduction in compressor moving parts. EVAPORATOR The evaporator is a shell and tube, hybrid falling film type heat exchanger. It contains a balance of flooded and falling film technology to optimize efficiency, minimize refrigerant charge, and maintain reliable control. A specifically designed distribution system provides uniform refrigerant flow for optimum performance. CONDENSER The YVAA introduces micro-channel coil to the York screw compressor chiller line. The micro-channel maximizes condenser heat transfer, resulting in a smaller footprint, and reduces refrigerant charge by as much as 50%. Each condenser coil is a single piece all aluminum construction including headers, tubes and fins to avoid galvanic corrosion due to dissimilar metals. Coils and headers are brazed as one piece. Integral sub-cooling is included. The design working pressure is 43 bar. Multiple, standard low sound, high efficiency, TEAO motor driven fans move air through the coils. They are dynamically and statically balanced, direct drive with corrosion-resistant glass fiber reinforced composite blades molded into low-noise, full airfoil cross sections, providing vertical air discharge from extended orifices for efficiency and low sound. Fan motors are Totally Enclosed Air-Over (TEAO), squirrel-cage type and current protected. The direct drive motors feature double-sealed and permanently lubricated ball bearings, cutting down on maintenance cost over the life of the unit. REFRIGERANT CIRCUIT An independent refrigerant circuit is provided per compressor. Each circuit uses copper refrigerant pipe formed on computer controlled bending machines to SECTION 2 - PRODUCT DESCRIPTION reduce the number of brazed joints resulting in a reliable and leak resistant system. • Discharge lines are provided with a manual compressor shutoff service valve (See Accessories and Options on Page 17 for suction line service valve). • The external oil separators, with no moving parts and designed for minimum oil carry-over, are mounted in the discharge line of the compressor. • Liquid line components include: high absorption removable core filter-drier, sight glasses with moisture indicators, manual shut-off valve with charging port, orifice and electronic expansion valve. • An economizer (flash) tank is located in each refrigerant circuit to increase the system efficiency. ELECTRICAL YORK has over 25 years of experience designing variable -speed drives specifically for chiller applications. The result is an extremely reliable air-cooled chiller system that offers industry leading efficiency at real world operating conditions, valve-less compressor loading/unloading, excellent capacity control, high power factor and soft start.. Incoming single point power is standard utilizing a lockable circuit breaker, 115VACcontrol transformer, VSD, fan contactors, ON/OFF unit switch, microcomputer keypad and display, Chiller Control and VSD Logic boards, and relay boards. Standard design includes IP55 rating, powder painted steel cabinet with hinged, latched, and gasket sealed outer doors equipped with wind struts for safer servicing. The panel includes a control display access door so that display and control features can be accessed without opening main cabinet doors. All exposed power wiring is routed through liquidtight, UV-stabilized, non-metallic conduit. BUILDING AUTOMATION SYSTEM CAPABILITIES The E-Link Gateway provides an economical and versatile connection between York equipment and open/ standard protocols. It efficiently manages the communication protocols currently used by York equipment, exposing the data in a consistent, organized, and defined fashion. The E-Link Gateway is available as a field-installed option on YVAA. A simple switch se- JOHNSON CONTROLS 15 2
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YVAA Style A Air-Cooled Screw Liquid Chillers ... - Johnson Controls

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