YK CENTRIFUGAL LIQUID CHILLER YK CENTRIFUGAL LIQUID CHILLER R134a REFRIGERANT COOLING CAPACITIES 750 kW to 7030 kW The YK range of chillers are designed for water or water/glycol cooling. The centrifugal compressor is open drive and close coupled to the motor. Heat exchangers are the flooded type with refrigerant passing through the cooler and condenser shells and water in the tubes. Capacity selection is computerised so that chiller components can be custom-matched to meet individual building load energy requirements. A Cooling Tower or Dry Cooler is required for heat rejection. All units are designed for plant room installation. CONTENTS Specification Accessories and Options Identification Dimensions Unit Weight & Refrigerant Charges Nozzle Arrangements Solid State Starter Location Motor/Compressor Dimensions Refrigerant Piping Diagram Installation Conditions - Limits FEATURES BENEFITS Manufactured to ISO 9001/EN 29001 High standard of quality control High full load and part load efficiency. Low operating costs at all load conditions. Operates at low condenser water temperatures. Reduced energy costs during winter and capital cost savings. Open drive motor. More efficient than refrigerant cooled motor. Mixed-matched components. Satisfies exact capacity/energy requirements. Industrial type centrifugal compressor. Long life reliability. Microprocessor control with OptiView Graphic Control Centre. Ease of operation with graphical representation of system operation and historical data. Unit remote alarm contacts. Warning notification. Remote water temperature and current limit reset. To improve operating efficiency. Building Management Interface. For central data logging and single point system monitoring and control. SPECIFICATION Compressor The compressor is a single-stage centrifugal type powered by an open-drive electric motor. The housing is fully accessible with vertical circular joints, with the complete operating assembly removable from the compressor and scroll housing. Compressor castings are designed for 18 bar working pressure and hydrostatically pressure tested at 27,5 bar. The rotor assembly consists of a heat-treated alloy steel drive shaft and impeller shaft with a cast aluminium, fully shrouded impeller. The impeller is designed for balanced thrust, dynamically balanced and overspeed tested for smooth, vibration-free operation. Insert-type journal and thrust bearings shall be fabricated of aluminium alloy, precision bored and axially grooved. Internal single helical gears with crowned teeth are designed so that more than one tooth is in contact at all times to provide even distribution of compressor load and quiet operation. Each gear is individually mounted in its own journal and thrust bearings to isolate it from impeller and motor forces. The shaft seal is a spring-loaded carbon ring with precision lapped collar cooled by oil during operation. A gravity-fed oil reservoir is built into the top of the compressor to provide lubrication during coastdown in the event of a power failure. Capacity control is achieved by use of pre-rotation vanes to provide fully modulating control from full load to minimum load. The unit is capable of operating with lower temperature cooling tower water during part-load operation. Pre-rotation vane position is automatically controlled by an external electric actuator to maintain constant leaving chilled water temperature. Lubrication System Lubrication oil is force-fed to all bearings, gears and rotating surfaces by an oil pump which operates prior to startup, continuously during operation and during coastdown. An oil reservoir, separate from the compressor, contains a submersible oil pump and immersion-type oil heater, thermostatically controlled to remove refrigerant from the oil. Oil is filtered by an externally mounted ½ micron replaceable cartridge oil filter equipped with service valves. Oil cooling is via a refrigerant cooled oil cooler, with all piping factory installed. Due to the possibility of refrigerant contamination and the requirement for field water piping, water cooled oil coolers are not acceptable. Both the refrigerant and oil side of the oil cooler are provided with service valves. An automatic oil return system to recover any oil that may have migrated to the evaporator is provided. Oil piping is completely factory installed and tested Page E.1 Doc. No. PC119/11.01/GB
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YK
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YK CENTRIFUGALLIQUID CHILLER
R134a REFRIGERANT
COOLING CAPACITIES750 kW to 7030 kW
The YK range of chillers are designed forwater or water/glycol cooling. The centrifugalcompressor is open drive and close coupledto the motor. Heat exchangers are theflooded type with refrigerant passing throughthe cooler and condenser shells and water inthe tubes.
Capacity selection is computerised so thatchiller components can be custom-matchedto meet individual building load energyrequirements.
A Cooling Tower or Dry Cooler is required forheat rejection.
All units are designed for plant roominstallation.
CONTENTSSpecification
Accessories and Options
Identification
Dimensions
Unit Weight & Refrigerant Charges
Nozzle Arrangements
Solid State Starter Location
Motor/Compressor Dimensions
Refrigerant Piping Diagram
Installation Conditions - Limits
FEATURES BENEFITSManufactured to ISO 9001/EN 29001 High standard of quality control
High full load and part load efficiency. Low operating costs at all load conditions.
Operates at low condenser water temperatures. Reduced energy costs during winter and capitalcost savings.
Open drive motor. More efficient than refrigerant cooled motor.
Industrial type centrifugal compressor. Long life reliability.
Microprocessor control with OptiView Graphic ControlCentre.
Ease of operation with graphical representation ofsystem operation and historical data.
Unit remote alarm contacts. Warning notification.
Remote water temperature and current limit reset. To improve operating efficiency.
Building Management Interface. For central data logging and single point systemmonitoring and control.
SPECIFICATIONCompressorThe compressor is a single-stage centrifugal type powered by an open-drive electricmotor. The housing is fully accessible with vertical circular joints, with the completeoperating assembly removable from the compressor and scroll housing. Compressorcastings are designed for 18 bar working pressure and hydrostatically pressure tested at27,5 bar. The rotor assembly consists of a heat-treated alloy steel drive shaft andimpeller shaft with a cast aluminium, fully shrouded impeller. The impeller is designed forbalanced thrust, dynamically balanced and overspeed tested for smooth, vibration-freeoperation. Insert-type journal and thrust bearings shall be fabricated of aluminium alloy,precision bored and axially grooved.
Internal single helical gears with crowned teeth are designed so that more than one toothis in contact at all times to provide even distribution of compressor load and quietoperation. Each gear is individually mounted in its own journal and thrust bearings toisolate it from impeller and motor forces. The shaft seal is a spring-loaded carbon ringwith precision lapped collar cooled by oil during operation. A gravity-fed oil reservoir isbuilt into the top of the compressor to provide lubrication during coastdown in the event ofa power failure.
Capacity control is achieved by use of pre-rotation vanes to provide fully modulatingcontrol from full load to minimum load. The unit is capable of operating with lowertemperature cooling tower water during part-load operation. Pre-rotation vane position isautomatically controlled by an external electric actuator to maintain constant leavingchilled water temperature.
Lubrication SystemLubrication oil is force-fed to all bearings, gears and rotating surfaces by an oil pumpwhich operates prior to startup, continuously during operation and during coastdown. Anoil reservoir, separate from the compressor, contains a submersible oil pump andimmersion-type oil heater, thermostatically controlled to remove refrigerant from the oil.Oil is filtered by an externally mounted ½ micron replaceable cartridge oil filter equippedwith service valves. Oil cooling is via a refrigerant cooled oil cooler, with all piping factoryinstalled. Due to the possibility of refrigerant contamination and the requirement for fieldwater piping, water cooled oil coolers are not acceptable. Both the refrigerant and oil sideof the oil cooler are provided with service valves. An automatic oil return system torecover any oil that may have migrated to the evaporator is provided. Oil piping iscompletely factory installed and tested
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SPECIFICATION (CONTINUED)Motor DrivelineThe compressor motor is an opendrip-proof, squirrel cage, induction typeoperating at 2950 tr/min.
The open motor is provided with a D-flange,bolted to a cast iron adaptor mounted on thecompressor to allow the motor to be rigidlycoupled to the compressor to providefactory alignment of motor and compressorshafts. For units with high power motor ormotor without D-flange, the compressor/motor is mounted on a rigid base frame.
Motor drive shaft is directly connected to thecompressor shaft with a flexible disccoupling. The coupling is of all metalconstruction with no wearing parts to assurelong life, and no lubrication requirements toprovide low maintenance. For units utilizingremote electro-mechanical starters, a largesteel terminal box with gasketed frontaccess cover is provided for field connectedconduit. Overload/overcurrent transformersare furnished for all units with low voltagemotor.
CoolerThe cooler is of the shell-and-tube, floodedtype designed for 12.5 bar working pressureon the refrigerant side, and be tested at 25bar. The shell is fabricated from rolledcarbon steel plate with fusion weldedseams; having carbon steel tube sheets,drilled and reamed to accommodate thetubes; and intermediate tube supportsspaced no more than 0.90 m apart. Therefrigerant side is designed, tested andstamped in accordance with the requiredcodes. Tubes are of the high-efficiency,externally and internally enhanced type.Each tube is roller expanded into the tubesheets providing a leak-proof seal, and beindividually replaceable. Water velocitythrough the tubes shall not exceed 3.6 m/s.Two liquid level sight glasses are located onthe side of the shell to aid in determiningproper refrigerant charge. A suction baffle orstainless mesh eliminators are locatedabove the tube bundle to prevent liquidrefrigerant carryover to the compressor. Thecooler has a refrigerant relief device sized tomeet the requirements of required codes.
Water boxes are removable to permit tubecleaning and replacement. Stub-out waterconnections, having victaulic grooves, areprovided. Water boxes are designed for 10bar design working pressure and be testedat 15 bar. Vent and drain connections withplugs are provided on each water box.
CondenserThe condenser is of the shell-and-tube type,designed for 12.5 bar working pressure onthe refrigerant side, and be tested at 25 bar.The shell is fabricated from rolled carbonsteel plate with fusion welded seams;having carbon steel tube sheets, drilled andreamed to accommodate the tubes; andintermediate tube supports spaced no morethan 1.2 m apart.
A refrigerant sub-cooler is provided forimproved cycle efficiency. The refrigerantside is designed, tested and stamped inaccordance with required codes.
The tubes are high-efficiency, externally andinternally enhanced type. Each tube is rollerexpanded into the tube sheets providing aleak-proof seal, and is individuallyreplaceable. Water velocity through thetubes shall not exceed 3.6 m/s.
Water boxes are removable to permit tubecleaning and replacement. Stub-out waterconnections having victaulic grooves areprovided. Water Boxes are designed for 10bar design working pressure and tested at15 bar. Vent and drain connections withplugs are provided on each water box.
Refrigerant Flow ControlRefrigerant flow to the cooler is controlled byeither a variable or fixed orifice. The variableorifice control is automatically adjusted tomaintain proper refrigerant level in thecondenser and evaporator. This iscontrolled by monitoring refrigerant liquidlevel in the condenser, assuring optimalsubcooler performance.
OptiView Control CentreThe YORK OptiView Control Panel is amicroprocessor based control system for YKcentrifugal chillers. It controls the leavingchilled liquid temperature via pre-rotationvane (PRV) controls and has the ability tolimit motor current via control of the PRV. Itis compatible with the standardelectro-mechanical starter, optional YORKSolid State Starter (SSS) and optionalOptiSpeed Variable Speed Drive (VSD)applications.
The panel has a full screen LCD graphicdisplay with a keypad interface. The graphicdisplay allows the presentation of severaloperating parameters at once. In addition,the operator may view a graphicalrepresentation of the historical operation ofthe unit as well as the present operation.
For ease of use the locations of displayedparameters are clearly and intuitivelymarked and instructions for specificoperations are provided on many of thescreens. Information can be displayed inboth metric (SI - temperatures in °C andpressures in kPa) or English (Imperial -temperatures in °F and pressures in PSIG)units in a number of languages.
The control panel also displays the unitoperation using status and warningmessages and records the cause of anyshutdowns (Safety, Cycling or Normal). Thisinformation is stored in battery backed forviewing.
Home
The 'HOME SCREEN' is displayed bydefault (at the 'VIEW ACCESS LEVEL')when the unit is powered on. This screenshows the main operating values, enablessystem access and permits furthernavigation to the sub screens.
System
The 'SYSTEM SCREEN' displays pressuresand temperatures for the evaporator,condenser, compressor and oil system.Electrical load and current limit are alsoshown.
Evaporator
The 'EVAPORATOR SCREEN' displays acutaway view of the unit evaporator showingcurrent operating temperatures andpressures, status of the flow switch andliquid pump signal and the control setpoints.
The local leaving chilled liquid temperature'SETPOINT' and 'RANGE', and leavingchilled liquid temperature cycling offset'SHUTDOWN' and 'RESTART' values arealso programmed on this screen.
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Condenser
The 'CONDENSER SCREEN' displays acutaway view of the unit condenser showingcurrent operating temperatures andpressures, status of the high pressure andflow switches and cooling liquid pump signaland the refrigerant level position andsetpoint.
Compressor
The 'COMPRESSOR SCREEN' displays acutaway view of the unit compressorshowing current operating temperaturesand pressures and status of the switchesand solenoids.
Oil Sump
The 'OIL SUMP SCREEN' displays the unitoil sump showing current operatingtemperatures and pressures and status ofthe oil pump run signal and solenoid. Thescreen will also provide data for the variablespeed oil pump (VSOP) when fitted.
Motor - Standard York Electro-Mechanical Starter (E/M)
Motor - Optional York Solid StateStarter (SSS)
Motor - Optional York OptiSpeed VSD
The 'MOTOR SCREEN' shows the motorcurrent as a percentage of full load amps(FLA), the current limit setpoint (set locallyor remotely) and the pulldown demand timeremaining, when pulldown demand limitingis active. The 'LOCAL MOTOR CURRENTLIMIT' and 'PULLDOWN DEMAND LIMIT'and 'TIME' are also programmed on thisscreen.
The 'SOLID STATE STARTER SCREEN'shows the SSS rating and operating voltageand current per phase.
The 'VSD SCREEN' shows the outputvoltage, frequency and phase current to themotor, total and cumulative input Kilowattsand PRV position. In addition, supply kVA,power factor and voltage and current totalharmonic distortion are shown on modelswith harmonic filters.
Setpoints
The 'SETPOINTS SCREEN' displays thecurrent operating leaving chilled liquidtemperature setpoint and remote range, lowleaving chilled liquid temperature cyclingshutdown and restart values and thereoffset and the current limit setpoint.
The local leaving chilled liquid temperature'SETPOINT' and 'RANGE', low leavingchilled liquid temperature cycling'SHUTDOWN' and 'RESTART' values,'LOCAL MOTOR CURRENT LIMIT' and'PULLDOWN DEMAND LIMIT' and 'TIME'and 'REMOTE ANALOGUE INPUT RANGE'should be programmed on this screen.
Setup
The 'SETUP SCREEN' displays generalconfiguration parameters as set by themicroprocessor board jumpers and programswitches. In addition, it allows the real timeclock to be enabled, setting of the time anddate and specification of the time format.
History
The 'HISTORY SCREEN' displays details ofthe last normal shutdown, last safety orcycling shutdown and a chronological listingof the last 10 safety or cycling shutdowns.
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Inrush Current
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Star Delta Starter
OptiSpeed VSD
Factory Installed Solid StateCompressor Motor Starter(Option) (max. 670 kW, low voltage)Reduced-voltage solid state starter for thecompressor motor. Starter isfactory-mounted and wired on the chiller.The starter provides, through the use ofsilicon controlled rectifiers, a smoothacceleration of the motor without currenttransitions or transients. The starterenclosure is IP 54, with a hinged accessdoor with lock and key. Electrical lugs forincoming power wiring are provided.
Protective devices include: phase rotationprotection; single phase failure protection;momentary power interruption protection;and high/low line voltage protection. Startershall include: three leg sensing overloads;120 volt control transformer for all unitcontrols; and a non-fused disconnect switch.Three-phase voltage and current readingsare coordinated with the unit OptiViewGraphic Control Centre, with digital readouton the display.
OptiSpeed VSD OptionThe OptiSpeed variable speed drive isfactory packaged and mounted on the unit. Itis designed to vary the compressor motorspeed by controlling the frequency andvoltage of the electrical power to the motor.
The adaptive capacity control logicautomatically adjusts motor speed andcompressor pre-rotation vane positionindependently for maximum part loadefficiency by analysing information fromsensors located throughout the unit.
The OptiSpeed VSD eliminates the need fora starter and has a soft startingcharacteristic that never exceeds 100% fullload amps. It also provides automatic powerfactor correction.
An optional harmonic filter limits electricalpower supply distortion from the variablespeed drive and further improves powerfactor correction.
Reduce Energy Costs with AdvancedVariable-Speed TechnologyThe OptiSpeed VSD can dramaticallyreduce energy costs. Annual savings cantypically average 30%. These savings arepossible because no constant-speed chillercan match a OptiSpeed VSD where it reallycounts in real-world energy performance.Real-world energy performance means atoff-design conditions as well as designconditions.
The graph shows typical energy savingswhen a OptiSpeed VSD is installed on anexisting constant-speed chiller. Note thedecrease in energy use as the loaddecreases (off-design condition). Energysavings can reach 75% at light loads.
Pressure Vessel Codes (Option)Pressure vessels can be supplied inconformance with the following codes :
Remote Electro-MechanicalCompressor Motor Starter (Option)A remote electro-mechanical starter can besupplied for the compressor motor. Thestarter is supplied in accordance with themanufacturer's starter specifications.
Portable RefrigerantStorage/Recycling System (Option)A portable, self-contained refrigerantstorage/ recycling system consisting of arefrigerant compressor with oil separator,storage receiver, water-cooled condenser,filter drier and necessary valves and hosesto remove, replace and distill HCF-134a. Allnecessary controls and safety devices shallbe a permanent part of the system.
Notes:1 All dimensions are approximate. Certified dimensions are available on request.23 Water nozzles can be located on either end of unit. Add 13 mm to nozzle length for flanges connections.4 To determine overall height, add 22 mm for isolators.5 Use of motors with motor hoods may increase overall unit dimensions.
H8 COMPRESSORCLR. – COND.
For compact water boxes (shown above), determine overall unit length by adding water box depth to tube sheet length.
Notes:1 All dimensions are approximate. Certified dimensions are available on request.234 To determine overall height, add 22 mm for isolators.5 Use of motors with motor hoods may increase overall unit dimensions.
J1/J2 COMPRESSORS J3 COMPRESSORS
Water nozzles can be located on either end of unit. Add 13 mm to nozzle length for flanges connections.
J3/J4 COMPRESSORSCLR. – COND. SHELL CODES
For compact water boxes (shown above), determine overall unit length by adding water box depth to tube sheet length.
Notes:1 All dimensions are approximate. Certified dimensions are available on request.23 Water nozzles can be located on either end of unit. Add 13 mm to nozzle length for flanges connections.4 To determine overall height, add 22 mm for isolators.5 Use of motors with motor hoods may increase overall unit dimensions.
CLR. – COND. SHELL CODES
For compact water boxes (shown above), determine overall unit length by adding water box depth to tube sheet length.
NotesA. Standard water nozzles are furnished as welding stub-outs with Victaulic grooves, allowing
the option of welding, flanges, or use of Victaulic couplings. Factory installed PN10 or PN20round slip-on water flanged nozzles are optional. Companion flanges, nuts, bolts andgaskets are not furnished.
B. One, two and three pass nozzle arrangements are available only in pairs shown and for allshell codes. Any pair of cooler nozzles may be used in combination with any pair ofcondenser nozzles.
C. Condenser water must enter the water box through the bottom connection for properoperation of the subcooler to achieve rated performance.
D. Connected piping should allow for removal of compact water box for tube access andcleaning.
NotesA. Standard water nozzles are furnished as welding stub-outs with Victaulic grooves, allowing
the option of welding, flanges, or use of Victaulic couplings. Factory installed PN10 or PN20round slip-on water flanged nozzles are optional. Companion flanges, nuts, bolts andgaskets are not furnished.
B. One, two and three pass nozzle arrangements are available only in pairs shown and for allshell codes. Any pair of cooler nozzles may be used in combination with any pair ofcondenser nozzles.
C. Condenser water must enter the water box through the bottom connection for properoperation of the subcooler to achieve rated performance.
D. Connected piping should allow for removal of compact water box for tube access andcleaning.
E. Allow 4267mm tube pulling space either end.
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SOLID STATE STARTER / VSD LOCATION (Optional)
COMPRESSOR MOTOR POWERCONNECTION ENTRANCE
POWER WIRING ENTRANCE COVER WITH 22mm DIA.KNOCKOUTS USED AS LEAD HOLES FOR POWERWIRING CONDUIT CONNECTORS
TE TEMPERATURE SENSOR OH OIL HEATER 5 COOLER 12 3 WAY VALVEPRV PRE-ROTATION PSV SAFETY VALVES 6 OIL COOLER 13 FILTER DRYER
XY/OY/PY SOLENOID VALVE TT HIGH SPEED DRAIN TEMP. 7 OIL RECEIVER 14 TRANSFERLT LEVEL TRANSMITTER TCV030HOT GAS BY-PASSSG SIGHT GLASS PGD PROX. GAP DISTANCE
LEGEND
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INSTALLATION CONDITIONS - LIMITSThe following discussion is a user guide in the application andinstallation of chillers to ensure the reliable, trouble-free life forwhich this equipment was designed. While this guide is directedtowards normal, water-chilling applications, the YORK salesrepresentative can provide complete recommendations on othertypes of applications.
LocationThe chillers are virtually vibration free and may generally be locatedat any level in a building where the construction will support the totalsystem operating weight.
The unit site must be a floor, mounting pad or foundation which islevel within 6mm and capable of supporting the operating weight ofthe chiller.
Sufficient clearance to permit normal service and maintenance workshould be provided all around and above the unit. Additional spaceshould be provided at one end of the unit to permit cleaning of coolerand condenser tubes as required. A doorway or other properlylocated opening may be used.
The chiller should be installed in an indoor location wheretemperatures range from 4° to 43°C.
Water CircuitsFlow Rate - For normal water chilling duty, cooler and condenserflow rates are permitted to any velocity level between 1 m/s and 3.6m/s. Flow should be maintained constant at all loads.
Temperature Ranges - For normal water chilling duty, leavingchilled water temperatures may be selected between 4° and 10°Cfor water temperature ranges between 2° and 11°C.
Water Quality - The practical and economical application of liquidchillers requires that the quality of the water supply for thecondenser and cooler be analysed by a water treatment specialist.Water quality may affect the performance of any chiller throughcorrosion, deposition of heat-resistant scale, sedimentation ororganic growth. These will hurt chiller performance and increaseoperating and maintenance costs. Normally, performance may bemaintained by corrective water treatment and periodic cleaning oftubes. If water conditions exist which cannot be corrected by properwater treatment, it may be necessary to provide a larger allowancefor fouling, and/or to specify special materials of construction.
General Piping - All chilled water and condenser water pipingshould be designed and installed in accordance with acceptedpiping practice. Chilled water and condenser water pumps shouldbe located to discharge through the chiller to assure positivepressure and flow through the unit. Piping should include offsets toprovide flexibility and should be arranged to prevent drainage ofwater from the cooler and condenser when the pumps are shutdown. Piping should be adequately supported and bracedindependent of the chiller to avoid the imposition of strain on chillercomponents. Hangers must allow for alignment of the pipe. Isolatorsin the piping and in the hangers are highly desirable in achievingsound and vibration control.
Convenience Considerations - With a view to facilitating theperformance of routine maintenance work, some or all of thefollowing steps may be taken by the purchaser. Cooler andcondenser water boxes are equipped with plugged vent and drainconnections. If desired, vent and drain valves may be installed withor without piping to an open drain. Pressure gauges with stop cocks,and stop valves, may be installed in the inlets and outlets of thecondenser and chilled water line as close as possible to the chiller.An overhead monorail or beam may be used to facilitate servicing.
Connections - The standard chiller is designed for 10 bar designworking pressure in both the chilled water and condenser watercircuits. The connections (water nozzles) to these circuits arefurnished with grooves for Victaulic couplings. Piping should bearranged for ease of disassembly at the unit for performance of suchroutine maintenance as tube cleaning. All water piping should bethoroughly cleaned of all dirt and debris before final connections aremade to the chiller.
Chilled Water - The chilled water circuit should be designed forconstant flow. A flow switch must be installed in the chilled water lineof every unit. The switch must be located in the horizontal pipingclose to the unit, where the straight horizontal runs on each side ofthe flow switch are at least five pipe diameters in length. The switchmust be electrically connected to the chilled water interlock positionin the unit OptiView Control Centre. A water strainer of maximum3.2 mm mesh must be field-installed in the chilled water inlet line asclose as possible to the chiller. If located close enough to the chiller,the chilled water pump may be protected by the same strainer. Theflow switch and strainer assure chilled water flow during unitoperation. The loss or severe reduction of water flow could seriouslyimpair the chiller performance or even result in tube freeze up.
Condenser Water - The chiller is engineered for maximumefficiency at both design and part load operation by takingadvantage of the colder cooling tower water temperatures whichnaturally occur during the winter months. Appreciable powersavings are realized from these reduced heads. Exacting control ofcondenser water temperature, requiring an expensive cooling towerbypass, is not necessary for most applications.
When equipped with the variable orifice, the chiller only requires thatthe minimum entering condenser water temperature be equal to orhigher than 5°C above the leaving chilled water temperature at theusual full load design of 5°C condenser water temperature range.When equipped with the variable orifice, the minimum enteringcondenser water temperature for other full and part load conditionsis provided by the following equation:
Min. ECWT = LCHWT - C RANGE + 9,5°C
Where:ECWT = entering condenser water temperatureLCHWT = leaving chilled water temperatureC RANGE = condenser water temperature range
At initial startup, entering condensing water temperature may be asmuch as 14°C colder than the standby chilled water temperature.Cooling tower fan cycling will normally provide adequate control ofentering condenser water temperature on most installations.
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NOTES1. Do not scale. Do not use for construction unless certified.
Dimensions symmetrical around except as shown.
2. Overall dimensions shown do not include external piping.Piping clearances must be provided as required. Serviceclearance must be provided as follows: 600 mm at rear andoverhead, 1000 mm at front. If a clear space is not available atone end for compressor removal, allow a minimum clearancewidth (at unit front or rear) of 1100 mm. Tube removal spacemust be provided at either end.
3. No special foundation required. Floor must be flat and levelwithin 6 mm, capable of carrying the operating weight.Standard unit is provided with neoprene vibration isolatormounts (shims for leveling by others) Add 22 mm to unit heightfor neoprene mounts to obtain installed height.
All units for upper floor location require optional (at extra cost)level-adjusting spring type vibration isolators and brackets; add25 mm to unit height for spring isolator mounts to obtaininstalled height.
4. Dimension "B" is height of factory assembled unit - add 150 mmfor shipping skids (optional at extra cost). Add 180 kg toshipping weight for skids.
5. Standard water nozzles are furnished as welding shut-outs withgrooves, allowing the option of welding, flanges, or use ofVictaulic couplings.
6. Dimensions shown in "Dimensions" section are factoryassembled units. Consult York for units shipped in separatedmodules (compressor/motor assembly, cooler and/orcondenser modules).
7. Factory insulation of cooler surface is optional at extra cost.Factory insulation does not include cooler water boxes. Add 57kg to the unit weight, when this option is chosen.
8. For flanges (optional) water nozzles, add to overall length ofunit :26 mm when nozzles are on both ends of unit;13 mm when nozzles are on one end only.
9. Connected piping should allow for removal of compact waterboxes for tube access and cleaning.
10. Remove protective fittings from relief connections. The reliefconnections should be vented outside the building by means ofa properly sized line in accordance with European standardsand national Safety and Health codes.
11. For Microcomputer OptiView Graphic Control Centre WiringDiagram, see Product Dwg. No. 213968 (units with Solid StateStarter) or Dwg. No. 214099 (units having remoteElectro-Mechanical Starter).
12. The unit should be connected in a workmanlike manner. Use noaluminium-core cables. Copper-core cabling alone isacceptable. Disconnect switches and fuses should be sized asa function of service.
13. Consult York for control panel supply modifications.
Weights14a. Shipping Weights - Indicates heaviest single piece of
equipment to rig. Weights include OptiView Graphic ControlCentre, oil charge and isolator pads. Weights shown DO NOTinclude:Motor: see Unit Weights and Refrigerant Charges;Refrigerant: see Unit Weights and Refrigerant Charges;Thermal Insulation: add 57 kg;Shipping Skid: add 181 kg;Solid State Starter: add 91kg (7L, 14L) or 137 kg (26L, 33L).
14b. Operating Weights: Weights shown include OptiView GraphicControl Centre, oil, water, refrigerant operating charge andfactory insulation of cooler. Weights shown DO NOT includemotor or Solid State Starter - add weight for motor andweights shown above for Solid State Starter.
14c. Loading Per Isolator - Equals Operating Weight divided by 4.Add motor weight divided by 4. If Solid State Starter suppliedadd weights shown above divided by 4.
14d. Motor Weights - Not included in Shipping Weights orOperating Weights. Add weights given in Unit Weights andRefrigerant Charges.
15. Floor layout shown is for neoprene vibration isolator pads. Ifoptional level-adjusting spring type vibration isolators are tobe applied see "Floor Layout - Spring Isolators".
16. When neoprene isolators are ordered, mounting plates arefactory installed as shown in Neoprene Isolators. Neopreneisolator pads are field installed between foot support andfloor.
17. For a given chiller, all four neoprene isolator pads areidentical. Pads are 25 mm thick with nominal 4 mm staticdeflection. Floor contact dimension depends upon operatingweight; determine operating weight, (see Note 14b) and referto "Neoprene isolator" section for pad size.
18. When spring isolators are ordered, mounting brackets arefactory installed as shown in Spring Isolators.
19. 22 mm Dia. knockouts are located on the top cover for leadhole of the Solid State Starter (when furnished) for field powerwiring conduit (flexible) connections (holes to be sized and cutby others).
20. Dimensions and weights shown on this drawing apply only tocooler and condenser shells having 10 bar water side.