Product Manual KPMWC00905-10EN Date: May 2010 Supersedes: -- Oil Free Centrifugal Chiller with Magnetic Bearings WMC XE (High Efficiency) 100S ÷ 300D Cooling Capacity from 317 to 1048 kW Refrigerant: R-134a McQuay is participating in the Eurovent Certification Programme. Product are as listed in the Eurovent Directory of Certified Products and on the web site www. eurovent-certification.
Index Features and advantages ................................................................................................................................................. 3 Next Generation Centrifugal ........................................................................................................................................... 3 Benefit Summary ....................................................................................................................................................
Features and advantages Next Generation Centrifugal The industry’s next generation of centrifugal chillers is here today with WMC chillers. The new technology begins with centrifugal compressors utilizing frictionless magnetic bearings for oil-free operation, integral variable-frequency drives, and high-speed direct drive technology. The high efficiency compressor is matched with highly efficient heat exchangers to make an impressive chiller.
Versions WMC is available in high efficiency version: XE: High Efficiency 6 sizes to cover a range from 317 up to 1048 kW (Cooling Capacity), with EER up to 6.00 and ESEER up to 9.60. The EER (Energy Efficiency Ratio) is the ratio of the Cooling Capacity to the Power Input of the unit. The Power Input includes: the power input for operation of the compressor, the power input of all control and safety devices.
General characteristics Cabinet and structure The cabinet is made of galvanized steel sheet and painted to provide a high resistance to corrosion. Colour Ivory White (Munsell code 5Y7.5/1) (±RAL7044). Frictionless Centrifugal compressor with magnetic bearings The frictionless Centrifugal compressor with magnetic bearings and integrated VFD is an innovative compressor that allows great unit efficiency and reliability.
Magnetic bearing system Fig.4 Fig.5 Fig.6 1. The rotor shaft’s position is held by front and rear electro-magnetic cushions; 2. The shafts position is monitored with 10 sensors that send a signal to a digital controller which then sends a command to the 5 separate pulse width modulators (PWM), for a proper shaft repositioning; 3. In case of power failure, within 0.
Electronics Inbuilt sophisticated electronics (Fig.7 and 8) guarantee self-diagnostics on Motor, bearings, compressor, expansion valve, performance, events, faults,…and allow the exchange and visibility of data with the chiller controller. VFD Shaft position control Magnetic bearing PWM Fig.
Ecological HFC 134a refrigerant The compressors have been designed to operate with R-134a, ecological refrigerant with zero ODP (Ozone Depletion Potential) and very low GWP (Global Warming Potential) that means low TEWI (Total Equivalent Warming Impact). Evaporator Flooded shell-and-tube evaporator operating with refrigerant in shell and water in tubes. Replaceable water tubes are fabricated from integral finned copper and mechanically bonded to steel tube sheets.
MicroTech II controller The control system of the chiller consists of two major components: the operator interface panel and the unit control panel. The touch screen panel is on an adjustable arm so that it can be positioned comfortably for the operator. The operator interface panel has a Super VGA touch-screen, utilizing graphics to provide clear and concise information on the chiller status, alarms, trends, and setpoint adjustment.
Controller features and benefits FEATURE BENEFIT Easy integration into Building Management System Designer can select any BAS supplier using standard open protocols and know the MicroTech II control will interface with it.
• Chilled-water reset. Accomplished directly on the unit by resetting the leaving water temperature based on the return water temperature. A remote 4-20 ma or 1-5 VDC BAS signal can also be used to reset the leaving water. Raising the chilled water setpoint during periods of light loads dramatically reduces electrical consumption. • Demand limit control. Maximum motor current draw can be set on the panel, or can be adjusted from a remote 4-20 ma or 1-5 VDC BAS signal.
Evaporator marine water box - Evaporator can be furnished with marine water boxes with victaulic or flanged connections (on request). To save time and work marine water boxes cover can be easily removed to clean internal tubes without the disconnection of water pipes.
Nomenclature WMC -A XE 100 S ST Machine type WMC = Oil Free Centrifugal Chiller Model series Letter A,B,…: major modification Efficiency level XE = Standard Efficiency Unit size 100 ÷ 300 Always 3-digit code Number of compressors S=1 D=2 Noise configuration ST = Standard Noise KPMWC00905-10EN - page 13/24
Specifications WMC XE-ST Version XE - ST TECHNICAL SPECIFICATIONS Cooling Capacity (1) (2) Capacity control Unit power input (1) (2) MIN - MAX Type at MIN capacity at MAX capacity Cooling Cooling kW --kW kW --------mm mm mm kg kg --l/s kPa Cooling Cooling --l/s kPa EER up to (1) ESEERup to (1) Casing Colour Material Dimensions Unit Unit Operating Weight Type Nominal water flow rate (3) Nominal Water pressure drop (3) Insulation material Type Nominal water flow rate (3) Nominal Water pressure drop
Sound Levels WMC XE-ST Unit size Sound pressure level at 1 m from the unit in semispheric free field (rif. 2 x 10-5 Pa) Power 63 Hz 125 Hz 250 Hz 500 Hz 1000 Hz 2000 Hz 4000 Hz 8000 Hz dB(A) dB(A) 100S 38.7 50.1 55.6 58.8 64.5 62.7 63.6 66.6 70.9 89.0 125S 39.2 50.6 57.0 59.8 66.0 63.5 64.7 67.9 150S 39.7 51.7 57.7 61.1 66.8 64.6 66.1 68.5 200D 41.7 53.0 58.6 61.8 67.4 65.8 66.4 69.6 250D 42.2 53.6 60.0 62.9 69.1 66.4 67.9 71.0 300D 42.7 54.
Operating limits WMC XE-ST 50 45 Condenser Leaving Water Temp. (°C) 40 35 30 25 20 15 Operation with Glycol (below 4°C Evap LWT) 10 5 0 0 2 4 6 8 10 12 14 Evaporator Leaving Water Temp. (°C) Above diagram is indicative: for the operating limits of the specific models please refer to the WMC selection software.
Dimensions WMC XE-ST Legend 1 - Electrical Panel 2 - Power Connection Slot 3 - Compressor 4 - Evaporator Water Inlet 5 - Evaporator Water Outlet 6 - Condenser Water Inlet 7 - Condenser Water Outlet WMC 100S 125S 150S A B C D 1276 1276 1276 3254 3254 3419 1822 1822 1822 1518 1518 1518 E (1) 334 334 334 F (2) 334 334 487 Dimensions G H 496 496 496 286 286 286 I L M N O 515 515 515 319 319 319 495 495 496 286 286 284 176 176 177 (1) Condenser hydraulic connections Evaporator hydra
Legend 1 - Electrical Panel 2 - Power Connection Slot 3 - Compressor 4 - Evaporator Water Inlet 5 - Evaporator Water Outlet 6 - Condenser Water Inlet 7 - Condenser Water Outlet WMC 200D 250D 300D A B C 1790 1853 1904 3441 3289 3401 1755 1748 1794 (1) Condenser hydraulic connections Evaporator hydraulic connections Note: the above drawing refers to size 300D (2) KPMWC00905-10EN - page 18/24 D (1) 487 334 334 E (2) 334 334 411 Dimensions F G 546 546 598 284 360 360 H I L M N 542 496 47
Installation notes Warning Installation and maintenance of the unit must to be performed only by qualified personnel who have knowledge with local codes and regulations, and experience with this type of equipment. Must be avoided the unit installation in places that could be considered dangerous for all the maintenance operations. Handling Care should be taken to avoid bumping and/or jolting during unloading from the lorry and moving the unit.
• The water in the system must be particularly clean and all traces of oil or rust must be removed. A mechanical water filter must be installed on the machine’s inlet piping. Space requirements Every side of the machine must be accessible for all post-installation maintenance activities. In particular, service clearance has to be provided at one end of the unit for possible removal of evaporator and/or condenser tubes.
Technical Specification for Oil Free Centrifugal Water Cooled Chiller GENERAL The Oil free Centrifugal water cooled chiller will be designed and manufactured in accordance with following European directives: Construction of pressure vessel Machinery Directive Low Voltage Electromagnetic Compatibility Electrical & Safety codes Manufacturing Quality Stds 97/23/EC (PED) 2006/42/EC 2006/95/EC 2004/108/EC EN 60204–1 / EN 60335-2-40 UNI – EN ISO 9001:2004 The unit will be tested at full load in the factory at t
CHILLER COMPONENTS Compressors 1. The unit shall utilize magnetic bearing, oil-free, semi-hermetic centrifugal compressors. The compressor drive train shall be capable of coming to a controlled, safe stop in the event of a power failure. 2. The motor shall be of the semi-hermetic type, of sufficient size to efficiently fulfill compressor horsepower requirements. It shall be liquid refrigerant cooled with internal thermal sensing devices in the stator windings.
• Liquid line temperature • Chilled water setpoint • Compressor and unit state and input and output digital and analog values 4. A fault history shall be displayed using an easy to decipher, color coded set of messages that are date and time stamped. The alarm history shall be downloadable from the unit's USB port. An operating and maintenance manual specific for the unit shall be viewable on the screen. 5.
