1、Supersedes:NoYEWS-D Screw Liquid ChillerInstallation, Operation and Maintenance ManualYEWS100SA50D / YEWS170SA50D / YEWS210SA50DSTYLE DWarningRefrigerant with certain pressure is infused into this systemIt is possible to damage the system severely if be with the incorrect operating procedure when in
2、 maintaining. All the maintenances should be performed by the maintenance technician of YORK in accordance with the Installation, Operation and Maintenance Manual of YORK.Form No:AP1105-IOM01(0407)IMPORTANT !Please read carefully before proceeding!General Safety GuidelinesThis equipment is complex,
3、when performing the installation, operation and maintenance, the personnel may be exposed to the following circumstances or dangers caused by components, including but not limited to: refrigerants, engine oil, compressive material, rotation part and high-low voltage, which will result in personal in
4、jury or even casualty if in improper handling. The operation/maintenance personnel have the responsibility to confirm these potential dangers to protect him from the injury while work safely. If these safety requirements are not followed, serve damages on the equipment and property will be caused, o
5、r even casualty on the personnel concerned. This manual is just for the authorized operation/maintenance personnel, whom are professionally trained to handle the appointed work safely and correctly. Most important of all, please carefully read and master this manual and other references before any o
6、peration on this equipment. The operator is required to be familiar with and follow any relevant government standards and criterion. York inherits the strategy of updating the product continuously, so that the information in this document can be correspondingly updated without prior notice. York is
7、in no promise to provide the latest information to all the owners of this manual; however, the user can acquire these information from the nearest representative office of engineering system service of York. It is the obligation of operation/maintenance personnel to determine the applicability of th
8、e corresponding equipment. If any question before operation, they will contact the customer to confirm whether the equipment have been updated and whether there is the latest available document or not. Variability of this DocumentNomenclature Y E WS 100 S DA 50Style Power supplyRefrigerant A-R134aS-
9、Standard unit100-Unit model Water cooled screw chiller High efficiency YORKYEWS-D Water Cooling Screw ChillerSection 1 Supplier InformationSection 2 Product IntroductionSection 3 Transportation, Transferring and StorageSection 4 InstallationSection 5 Control CenterSection 6 Startup CommissioningSect
10、ion 7 OperationSection 8 MaintenanceSection 9 Trouble ShootingSection 10 Technical DataSection 11 Spare PartsSection 12 Transferring Stop, Removal and HandlingSection 13 Installation Instructions for the HF68 Flow SwitchesTable of Contents14911174244853556162634YEWS-D Water Cooling Screw Chiller1.1
11、IntroductionYork YEWS-D water chiller complies with the most rigorous design and manufacture standards, which ensures the high-quality, reliability and flexibility of various air-condition project. This unit can be used for supplying the chilled water, however, be unsuitable for other applications b
12、eyond this manual. This manual contains all the necessary information of operation and maintenance guide for correct installation and testing. Please read this manual carefully before operating and overhauling the unit. All the work elaborated in this manual (including installation, testing and main
13、tenance) should be performed by the trained professional personnel.The manufacturer should not burden any responsibility of injury or damage due to improper installation, testing, operation or improper maintenance, or disobeying the process and guidance in this manual. 1.2 Warranty One year upon the
14、 date of startup and commissioning, or 18 months upon the date of shipment (subject to the prior arrival), York guarantees to remedy the defect of the manufacturing process and material of all the equipment and parts, excepted as the guarantee period is extended in the Contract. The warranty is limi
15、ted to alter and transport any faulty parts or components, if this part is unavailable due to quality or manufacture problem, the compensation must be supported by the evidence, namely the fault occurs in the guarantee period and the unit is run in the specified parameters. Section 1 Supplier Inform
16、ationAll the compensation for the warranty must show the unit model, series no. and order no., all of which are printed on the tablet of the unit. Before getting the written consent of YORK International Inc., any alteration on the unit shall be prohibited, or the warranty should be invalid. The fol
17、lowing clauses should be obeyed to comply with the product warranty: the commissioning of startup should be performed by the authorized personnel of York. Only the parts, lubricant and refrigerant recognized by York can be adopted. In the regulated time, all the operation and maintenance required in
18、 this manual should be completed by the eligible trained personnel. The warranty should lost efficacy automatically for disobeying any above-mentioned clause. 1.3 SafetyThe safety standards of YEWS-D water-chilling unit designed and manufactured by the factory passed the attestation of ISO 9000, whi
19、ch meet the limitation regulated in this manual and comply with the following standards: JB8654 Safety Requirements of Positive Displacement and Centrifugal Water-chilling (Heat Pump) Packages.1.4 Safety Liability We take the safety liability into account in designing and manufacturing the unit to e
20、nsure that it can meet the safety requirements. However, the followings must be placed in the first in operating any equipment: personal safety, other personnel and equipment safety. Please operate this machine correctly according to the processes in this manual. 1.5 About This Manual The following
21、words in this manual are used for YEWS-D Water Cooling Screw Chiller1reminding the operating personnel to pay attention to the potential dangers. The WARNING in this manual is used for marking the dangers that may cause the personnel accident. The guidance, simple explanations and possible aftermath
22、 due to neglecting these guidance should generally be given, which are expressed in black on red label. CAUTION signs the dangers that may result in the damage of machine, destroy of other equipment, or environment pollution. The guidance, simple explanations and possible aftermath due to neglecting
23、 these guidance should generally be given, which are expressed in black on yellow label.NOTE is used for highlighting the other useful information, which has no special relation with the safety, and they are expressed in black on white label.The contents of this manual contains the optimal operation
24、al approach and process recommended by York, however, it is just for guiding, but not overriding the above-mentioned personal responsibility and local safety ordinance. The copyright of this manual and other information presented together with the product will be in the possession of York. The whole
25、 or part of them can not be translated without the written consent of representative of York. 1.6 Used Equipment Applicability This unit can be used for supplying the chilled water, however, unsuitable for other applications beyond this manual. It is possible to cause personnel injury or equipment d
26、amage if used for other purposes or in misoperation. The design limit appointed in this manual can not be exceeded in the operation. Supporting structure The solid supporting structure is required to supply for the unit to avoid the personnel injury or equipment damage.Mechanical strengthThe unit sh
27、all not burden load or pressure from the neighboring equipment, pipe or structure. The other parts are forbidden installing on the unit, for any external load or pressure may destroy the structure to further injury the operator or damage the machine. General usage The appropriate safety precautions
28、should be adopted when operating the unit, or some dangers will happen easily and result in the injury. (Make sure that the password of the unit is just mastered by the authorized person, who knows the possible dangers and necessary safety precautions in the operation and maintenance process, and ho
29、w to maintain the hot temperature, high voltage and electrical equipment much well, which is very important). Pressure system The unit contains the refrigerant vapor and liquid with certain pressure, so that the leakage may result in dangers or cause the injury in the running or unused. The user sho
30、uld ensure that the installation, operation and maintenance are very careful to avoid damaging the pressure system. Please do not attempt to close the spare parts of the pressure system except the professional personnel. Electrical SystemThe unit must be earthed; therefore, the installation or maint
31、enance is forbidden before shutting off the main switch, insulating the power of unit and any controlling power, all of which are completed via the special tools by the trained personnel. Please do not attempt to touch the inside of operation board, distribution board or other YEWS-D Water Cooling S
32、crew ChillerCAUTIONNOTEWARNING2electrical cabinet. Refrigerant and lubricant The refrigerant and lubricant used by the unit are generally non-toxic, nonflammable and no corrosive, which can not cause particular harm to the body, however, the gloves and safety goggles had better to be put on when in
33、working. Taking leakage as an example, the people will suffocate in the limited or closed space, so that please pay attention to keeping good ventilation in the machinery room.Cleaning under high temperature and high pressure Do not clean any parts of pressure system under high temperature and high
34、pressure (such as swash with the vapor), for which may result in pressure relief. The detergent and solution are also forbidden to avoid the corrosion. 1.7 Emergency stop One switch of emergency stop is set on the electrical control cabinet, which is the red button. When the emergency happens, this
35、switch can cut off the power of the controlling system, as well as lock the switch on the place of OFF.1.8 Safety Signs The following signs are stuck on each unit to show the guidance or the potential danger. The meaning of each sign is as follows: In white on blue. Please read the instruction first
36、ly to be convenient for operation. In black on yellow. Warning-hot surfaceIn black on yellow. Warning-please cut off all the powers before dismantling/removing the cover otherwise the fatal danger will happen. In black on yellow, sign for general attention. YEWS-D Water Cooling Screw Chiller32.1 Int
37、roduction York YEWS-D water-chilling unit is used for supplying the chilled water; all the units are designed to be installed in the room (machinery room). 2.2 Compressor The semi-hermetic twin-screw compressor is adopted to ensure the high-efficient and reliable operation. The capacity control can
38、be realized via the slide valve. The compressor is positive displacement with two spiral steel rotors. The motor with 50HZ can drive the male rotor directly with the rotational speed of 2975rpm, while the male rotor drives the female rotor, one flat of slim oil film is between the female and male ro
39、tor. Each compressor is direct-driven and semi-closed twin-screw, and including the followings: twin-screw rotor made from the forged steel, while the unit of precision machining compressor is made from the cast iron. The high-efficient oil separator is placed inside the machine. The inner discharge
40、 check valve can prevent the rotor from reversing when the machine stops. The high-efficient semi-closed electrical machinery can cool the suction, which also is with the overload protection, thermoelectricity resistance and over-current protection. The suction filter and full-flow oil filter are in
41、stalled inside the compressor. The refrigerant gas is sucked into the interspaces constituted between the 5 gear male rotors and 7 gear female rotors, and then the rotor further meshes to close the rotor spiral in the suction mouth and unmeshed the compressed gas in the discharge mouth along with th
42、e axis direction. Before the designed capacity leaves the rotor exhaust chamber, the steam capacity is compressed, Section 2 Product Introduction while the pressure increases. Because the cycle of the suction and discharge is superposed, the airflow can keep stable. The rotor is inside the body of t
43、he compressor, while the body is made from the cast iron with precision machining to minimize the interspaces between the shell and rotor. The contact between the male and female rotor is mainly on pitch circle of each rotor, so that the rotor can not be abraded much and the reliability can also be
44、increased. The compressor adopts the wearable bearing to decrease the power waste and strengthen the reliability, while four single cylindrical roller bearings burden the radial load; the angular contact ball bearing burdens the axial load. No matter under any pressure ratio, they can keep the corre
45、ct orientation of the rotor, which can reduce the leakage and keep the efficiency. One check valve is set in the discharge port, which can be used for preventing the rotor from reversing due to the pressure grads of refrigerant when the unit is stopped. The refrigerant vapor from the evaporator flow
46、s with the motor and cools it. The overloading protection includes the over heating protection and over-current protection.The inner oil separator separates the oil from the refrigerant to directly turn back the compressor to lubricate. One inserted heater of 350W is set in the compressor, which is
47、in constant temperature control; therefore, it can prevent the refrigerant from dissolving into the lubricant. Motor startup The compressor motor adopts the star-shaped/triangle conversion starter, which includes 3 motor contactors and 1 startup relay and can restrict the startup electrical current
48、in 33 LRA around in the first 410 seconds, after completing the connection of the triangle, the electric current raise to the normal level. YEWS-D Water Cooling Screw Chiller4The corresponding relay is electrified when the microprocessor gives out the compressor startup signal. The relay contacts sw
49、itch to startup and connect the motor starter in the situation of start-shaped and keep 4 10 seconds. Capacity control The compressor should be started up in the minimal loading place, and reach the capacity control in full loading of 25 100 via one continuous slide valve. The spring of the capacity adjustment is automatically reset the minimal loading place to ensure the startup of the compressor motor in the minimal loading. 2.3 Oil Separator The inside separator separates the majority of the oil and lubricate it directly, while a few of oil is separated to turn back the compressor. The oi
