约克螺杆机组YEWS操作维护手册

YEWS100SA50D / YEWS170SA50D / YEWS210SA50D

STYLE D

Warning

Refrigerant with certain pressure is infused into this system

It is possible to damage the system severely if be with the incorrect operating procedure when in maintaining. All the maintenances should be performed by the maintenance technician of YORK in accordance with the Installation, Operation and Maintenance Manual of YORK.

IMPORTANT !

Please read carefully before proceeding!

General Safety Guidelines

This equipment is complex, 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 injury 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, or 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 operation on this equipment. The operator is required to be familiar with and follow any relevant government standards and criterion.

Variability of this Document

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 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 the 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.

Nomenclature

A50

Y E WS100S D

Style

Power supply

Refrigerant A-R134a

S-Standard unit

100-Unit model

Water cooled screw chiller

High efficiency

YORK

Section 1 Supplier Information Section 2 Product Introduction

Section 3 Transportation, Transferring and Storage Section 4 Installation Section 5 Control Center Section 6 Startup Commissioning Section 7 Operation Section 8 Maintenance Section 9 Trouble Shooting Section 10 Technical Data Section 11 Spare Parts

Section 12 Transferring Stop, Removal and Handling

Section 13 Installation Instructions for the HF68 Flow Switches

Table of Contents

1491117424485355616263

4

1.1 Introduction

York 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 beyond 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 maintenance) 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 date of startup and commissioning, or 18 months upon the date of shipment (subject to the prior arrival), Y ork 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 limited 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 Information

All 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 following clauses should be obeyed to comply with the product warranty: the commissioning of startup should be performed by the authorized personnel of Y ork. Only the parts, lubricant and refrigerant recognized by York can be adopted.

In the regulated time, all the operation and maintenance required in this manual should be completed by the eligible trained personnel. The warranty should lost efficacy automatically for disobeying any above-mentioned clause.

1.3 Safety

The safety standards of YEWS-D water-chilling unit designed and manufactured by the factory passed the attestation of ISO 9000, which 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 ensure 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 words in this manual are used for

reminding 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 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 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 operational approach and process recommended by Y ork, 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 Y ork. The whole 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 damage 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 strength

The unit shall 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 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 how 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 should 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 System

The unit must be earthed; therefore, the installation or maintenance 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

CAUTION NOTE WARNING

electrical 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 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 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 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

firstly to be convenient for operation.

In black on yellow. W arning-hot surface

In black on yellow. W arning-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.

2.1 Introduction

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 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 rotor.

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 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 installed 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 the 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 the 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 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 correct 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 flows 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 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 in 33LRA around in the first 4~10 seconds, after completing the connection of the triangle, the electric current raise to the normal level.

The corresponding relay is electrified when the microprocessor gives out the compressor startup signal. The relay contacts switch to startup and connect the motor starter in the situation of start-shaped and keep 410 seconds.

Capacity control

The compressor should be started up in the minimal loading place, and reach the capacity control in full loading of 25100 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 oil can only return the compressor by one oil filter with one removable filter cartridge; the oil is in high pressure, which leads back the oil to compressor to lubricate the bearing and rotor.

After that the oil is sprayed to the closed spiral near the suction rotor. The oil spraying is finished automatically due to the differential pressure between the discharge pressure and suction end, which not only lubricates the rotor and used as oil seal, but also reduce the leakage to ensure the compression of the refrigerant (capacity efficiency).

When the compressor is running, the oil level must be higher than the visible location of the sight glass, please stop to check the reason once lower than and to inject the oil according to the actual situation, while the oil level can not be higher than the upper sight glass of inner oil separator, please stop to check and determine whether the oil should be discharged or not according to the actual situation once higher.

2.4 Circuit of Refrigerant Each unit is with one independent refrigerating circuit, the liquid pipe includes: manual globe valve with infusing nozzle, throttling device and air bypass electromagnetic valve.

2.5 Condenser

The condenser is the shell and tube type, which can be washed. The heat exchanging pipe is the 19mm seamless copper tube with outer finned and expansion joints to the tube plate, with one super cooler in the inner.

The designed pressure of the water is 10bar. HG20615 flange is set on the water pipe joint to be convenient for connecting with the pipe. The designed pressure of the safety valve of refrigerant is 20. 7 bar, and the condenser is manufactured and inspected in accordance with the State Standards of China GB 151.

2.6 Evaporator

The flooded evaporator is adopted with the water inputs and outputs from the same side. The designed pressure of the safety valve of refrigerant is 20. 7 bar, and the condenser is manufactured and inspected in accordance with the State Standards of China GB 151.

The shell is wrapped with the soft aperture-closed heat preservation material in the thickness of 19mm. HG20615 flange is set on the water pipe joint to be convenient for connecting with the pipe.

2.7 Distribution Board and Control Panel

All the control and startup components for the unit are wired and completed the performances testing by the factory. The cabinet is designed according to IP23 and manufactured with the steel plate of powder spraying.

The distribution board and control panel is divided into the power, control and startup cabinet according to the electrical system. The power and control part are with the individual hinged door, and each door has the lock and sealing pad.

Each distribution board includes: compressor startup

contactor, control circuit, compressor contactor coil and components of compressor overloading protection.

The overload protection of compressor is running as follows: read the electrical current signal to the control mainboard via CT, and to protect once exceeding the setting value upon comparing with FLA value.

The power protection module of compressor provides the protection hyperlow / hyperhigh / phase sequence/phase out of input voltage.

The control panel contains: microcomputer keyboard, HMI and microprocessor panel.

2.8 Microprocessor Control

The microprocessor is with the following performances and displays: liquid crystal display with 120 characters, which can display text with 8 lines of Chinese character and English letters or digit code, back lighting with the LED to be convenient for reading. Sealing keyboard with 20 keys, which are divided into function keys and programme keys.

The standard controller includes: running signal contact, unit alarming contact, refrigerating pump and cooling pump control, automatic reset after break, system automatically optimization according to the running situation.

The software is memorized in the flash memorizer to avoid the faults of the water chilling unit due to breaking of alternating current power. The program set values is saved in EPROM memorizer. The timing clock of controlling system is provided by RTC, and the service life of the backup lithium battery is 5 years at least.

2.9 Current protection of motor

The motor protection of microprocessor provides the overcurrent protection to ensure that the motor is free from the damages due to excessive voltage and refrigerant and other overcurrent problems.

After 3 seconds upon starting the star-shape/triangle starter, if the current exceeds 115FLA trip point, the microprocessor will stop the system and lock to be the fault. It is required to reset the corresponding system switch to eliminate the fault and restart the system. Please check the motor, circuit and refrigerating system before restarting.

With measuring that the current is lower than 10 FLA(full loading), the microprocessor will also provide the under-current protection. The microprocessor will stop the running once under-current. The under-current protection will perform after 4 minutes of triangle starter startup to ensure that the system keeps running under the situations of without refrigerant, connecting of the motor protection components and mechanical high-voltage switch. It is required to reset the system switch once tripping due to under-current.

Components of motor protection

The electronic motor protection components provide the overheating protection, resistance of three phases PTC (Positive Temperature Coefficient) is installed in each phase of motor winding for protection. The resistance value of sensor will keep in 1K within 125. It will trip once coming up to 13K, so that the control circuit is in no electricity. When the motor cools down and the resistance of sensor reduces to 3.25K, the unit can be restarted again.

The signal will be output to the mainboard to stop the motor once the protection components trips.

2.10 Keyboard Control

Display

The parameters can be displayed in Chinese and English, and the following parameters for each circuit will be displayed:

Input/output temperature of chilled water

Input/output temperature of cooling water

Time and date, start and stop time at ordinary days, arrangement on holidays and status of access beyond in manual.

Compressor running time and startup times Compressor running status

Suction, discharge, oil pressure and discharge temper-ature of the system

Percentage of compressor current in full loading current Cutoff value and setting value: output temperature of chilled water, hyperlow of the suction, overhigh of the discharge and temperature, overhigh current or hyperlow, hyperlow of the chilled water

Setting value of unloading limit for overhigh discharge pressure and compressor current

Information for exceeding the running limit

Faults stop records over 50 times

Input

Setting the output temperature and temperature difference of chilled water

Clock

Setting the time, startup and stop schedule for ordinary days or holidays

Programming

Setting with the signals from YORK ISN or building automation system: hyperlow breaking value for output temperature of chilled water, restart timer for 180300 seconds, unloading point for average current, reset the setting value for output temperature of chilled water.

Additional functions (with password) to be convenient for the professional inspection and maintenance technician to programme.

Cutoff value: hyperlow suction pressure, overhigh discharge pressure, overhigh discharge temperature, unloading setting value for overhigh discharge pressure, percentage limit of compressor current.

2.11 Accessory and Selection

With the standard RS485 joint, YORK ISN building automation system can directly provide the commun-ication signal to the standard control panel.

Flow switch

Gate flow switch, the designed working pressure is 10.3bar and applies for the chilled water and cooling the water pipelines.

25mm spring shock absorber

The horizontal adjustable spring shock absorber is installed below the ground plate of the unit (on-site installation).

2.12 Performance Description

Low pressure refrigerant liquid absorbs the hot outside the pipe in the flooded evaporator and evaporate as the refrigerant vapor, after that the low-pressure vapor enters into the compressor, while in the compressor, the pressure and temperature raise as the high temperature and high pressure gas, which separate the mixed lubricant in the outer and inner oil separator, then the lubricant returns back to the compressor for cycling. The oil-free cooling steam in high pressure and high temperature enter into the condenser, while the cooling water absorbs the heat of condensation, the refrigerating vapor cools to be the over-cooling liquid, and then the refrigerant liquid enters into the throttling device and decrease the pressure and temperature to reach the evaporator, then the whole refrigerating cycle is finished.

F i g 2-1 F l o w C h a r t

Section 3 Transportation, Transferring and Storage

3.1 Delivery and Storage

In order to acquire the stable quality and utmost reliabil-ity, all units have been tested and inspected before leaving the factory. The complete unit is shipped, moreover, the refrigerant YORK L oil with certain pressure is injected. The unit can not be shipped with the export crate, excepted as otherwise are especially marked in the sales order.

If the unit needs to be stored before installation, please adopt the followings precautions:

Make sure that the unit is free from wind and rain.

Make sure that all the opens (such as pipe joint) are with the protective cover or blanking plate.

The unit should be stored in the place without many persons to reduce the dangers of accidental mechanical contusion.

Don't wash with the steam to avoid operation of relief valve.

Please remove the key to the control panel and hand over to the principal. Please inspect the unit periodically in the period of storage.

3.2 Inspection

Please remove the transportation package to inspect the unit and confirm that all the parts have been received and without any damage due to transportation. Any obvious broken must be remarked on the waybill of the forwarder, and claim for compensation according to the guidance on the notice.

3.3 Transferring

Before transferring the unit, please confirm that the applicable installed device and tools in the installing location, and which can burden the weight of the unit and all accessories.

The unit is designed to hoist with the wire rope, one beam showed in the following picture hoist the unit (hoisting hole on tube plate can adopt 6.8shackle), the hoisting component must be long enough for avoiding all the hoisting, also the damages caused by the hoisting chain. The hoisting component must reach the requirement of the unit weight.

Do not move the unit on the roller, or hoist the

unit by the fork-lift truck.

CAUTION

Fig 3-1 Rigging

The field for installing the unit must be the floor, mounting pad or foundation, of which the horizontality must be within 6mm and can burden the operation weight of the whole unit.

The unit must be placed in the machinery room with the temperature of 4.443.3??, there is enough space around and above the unit for the routine maintenance. The space for cleaning the evaporator and condenser should be retained at one end of the unit, as well as make use of the door opening or other suitable opening. Space for maintenance requirement The space requirement is as follows:

Back, side and upper part of the unit-610mm Front of the unit-914 mm

Pipe removal-See the below table:

4.3 Installation of Shock Absorber

The selected shock absorber can be bulk transported along with the machine.

Place the correct installation location upon the Foundation drawing (Refer to Section 10).

Fixation-Installation

Two methods for selection: rubber shock pad, spring shock absorber

Rubber shock pad: place each pad on its correct location respectively, and then set down the unit carefully on the shock absorber.

Spring shock absorber: place each pad on its correct location respectively, and then set down the unit carefully on the shock absorber.

Equally distribute the weight of unit on the spring via regulating the adjusting nut on the spring shock absorber

Section 4 Installation

4.1 Summary

This manual introduces how to install YEWS-D screw water cooled chiller. The standard unit for usage is generally installed well, and the pipes and circuits are prepared well, and the nitrogen or refrigerants has been infused. When it is installed on the site, it just requires completing the connections of chilled water pipelines, water pipe of condenser, safety pipelines of refrigerant gases and power, etc.

The business representative of Y ork will provide the services of installation inspection and initial startup in accordance with the requirements in the contract. If the followings are not obeyed, Y ork shall keep the right to stop the liabilities of Three Guarantees:

1. Prohibit to opening any valve or connector under any circumstances, for which will result in the leakage of the nitrogen or refrigerants.

2. Excepted that the business representative supervises of York, otherwise no removal or startup of the unit upon any reason.

3. No final power connection for the compressor motor or the controlling center.

4. No oil injection in the system.

5. Do not attempt to startup the system.

6. Please do not infuse the hot water or steam (the highest temperature is100F ??, 38??)into the evaporator once the chiller is powered on.

4.2 Arrangement Requirements

The YEWS-D unit is generally located in any plane inside the building because of its low noise and slight vibration the structure of the plane is just required to support the operation weight of the whole unit.

In order to reduce the influence on the surroundings from the vibration and noise, it suggests that the unit should be installed in the area, where the vibration and noise is insensitive.

Model

Space for removing the pipe YEWS100SA50D

2100mm YEWS130SA50D /170/2102650mm

(below the ceiling panel of the shock absorber). It will rise in counterclockwise rotation, while decrease in clockwise rotation. It should be rotated twice for one time till the unit base is in the horizontal position. 4.4 Pipe Connection General requirement

The following connection guide aims at guaranteeing the efficient running of the unit. If these are not obeyed, the damage on the unit or decrease of the performance may be caused, or even the warranty is invalid.

Do not exceed the maximum flow and pressure drop under any circumstances. See Section 10 for the detailed information.

The flow switch must be set on the output pipe of the evaporator/condenser, and connect with the control p- anel by the shielded cable. Please refer to the electrical connection for the detailed information. It is for preventing the damages on evaporator/condenser due to running in water-lack.

All the flow switches are required to be with the metal contact to comply with the situations of low voltage/current. The compulsory flow switch applies with the conditions with 10bar working pressure.

The chilled water pump should be installed on the input pipe of the evaporator.

The pipe and joint must be with the independent support without producing any pressure to the unit. The munity connection is suggested to adopt to reduce the vibration to the buildings. If the unit is installed the shock absorber, it must be required to adopt the munity connection, for during the process of running, the unit will translocate more or less.

The pipes and joints connected to the evaporator should be easy for teardown, which is convenient for cleaning and inspection on the appearance of heat exchanger joint. One filter should be respectively installed on the evaporator and condense, 40 eyes is the best. The location is on the pipe joint as close as possible, and with cutoff switch. The evaporator can not accept the over fast washing speed, the scraps produced from the washing can not be left in the evaporator. Bypass pipe and valve with suitable size are good for the cleaning of the pipe, and can also be used for isolating the evaporator, so that it can not disturb the flow of the other unit.

The thermometer and joint of pressure gauge should be installed on the input and output pipe of the evaporator. The joint for the drain pipe should be set on the low point of the pipe to drain the water out of the pipe, while joint of kicker port on the high point to exhaust the air in the pipe.

Please avoid the scrap remaining in the water pipes between the evaporator and filter, for which will cause the serious damages on the pipe bundle of the evaporator. both the installing personnel and user must insure that

the water quality is very good without any insoluble gas, otherwise the steel parts in the system will be oxidized.

Filter Pressure gauge 1 joint of drain pipe Thermometer

"Fig 4-1 Diagram of cooling water and chilled wa-ter pipe connection

Remark:

1The user should make the regular inspection on the water quality before installation and in the process of using. It is possible that the high efficient heat exchanging pipe of the heat exchanger will be corrupted to leakage or fouling severely once the water quality exceeds the allowable value.

2The items with the tendency of corrosion show that the water quality exceeds the allowable value in long-term, which will result in the corrosion and leakage of the heat exchanging pipe, so that the unit can not run normally and affect the normal usage.

3The items with the tendency of fouling show that the water quality exceeds the allowable value in long-term, which will result in the heat exchanging and fouling severely, so that the performances of the unit decrease.

4The water should be drained out if the unit needs to be stop for long time, it suggests that the heat exchanging pipe should be cleaned after each long-time stop.

5The responsibility produced from the water quality should be burdened by the user.

4.6 Pipe Arrangement

The following pipe connection guide is for each single unit; please connect the pipes according to the drawing for multiple units.

4.7 Pipe Connection Method and Size

Please refer to Chapter Ten for connection size of each model.

The standard pipe connection of all evaporator and condenser should be HG20615 welding flange joint.

4.8 Pipe of refrigerant relief valve

The evaporator and condenser are all with the relief valve to prevent that the refrigerant pressure in the container is over high, and then result in the action of the relief valve,

4.5 Water T reatment

The unit performance given in the design guide is based

2.

on the fouling coefficient 0.044m??/KW of the conden-2.

ser, 0. 017m??/KW of the evaporator. The dust, dirt and grease on the surface of heat transfer will affect the performances of the unit. The impurity in the chilled water system will increase the pressure drop of the evaporator and condenser, and decrease the flow, as well as cause damages on the pipe bungle of the evaporator. York suggests that you'd better consult with the expert of water treatment to confirm that the used water can not affect the carbon steel and steel material of the heat exchanger. The PH value of the chilled water should be maintained between 6.58.0. The water quality should comply with regulations of GB 50050.

and avoid the danger or injury on the personnel due to discharged high pressure steam or liquid. The indoor relief valve should be installed outside the building.

The diameter of the outlet pipe should be large enough, or it will easily hinder the action of the relief valve. Excepted as specialized in local rules, the allowable minimum inner diameter depends on the length of the pipe; the detailed value should be given in the following formula

5

D=1.447L

In the formula: D=minimum inner diameter of the pipe (cm), L=pipe length (m).

If several valves use one pipe of relief valve, the sectional area should be the sum of demand for each valve. No different type of valves is allowed on the same one public pipe. Please adopt the precautions to ensure that the output of the relief valve/vent pipe should be free-flowing.

4.9 Electrical Connection

In order to ensure the safety and normal running of the unit, the following notices should be obeyed. If disobeying, it is possible to result in the personal injury or equipment damage, even the invalid of the warranty.

It is prohibited to adding the controlling component (relay, etc.) in any part of the control panel, the power cord and control wire control panel, if disobeying the regulations; it is possible to result in the danger of electrocution. In addition, the electrical interference may cause the fault or damage on the unit or the controller.

After completing the connection, please do not connect the main power of the unit, for once the main power of the unit is connected, some inner components will be with the electricity. It should be completed only by the authorized personnel.

4.10 Cooling Water System

For the YEWS-D unit, the condenser should be connected with the cooling tower, however, some part can be cooled with the well water. For the water-chiller unit, it is necessary to control the flow and/or temperature of cooling water entering into the condenser to maintain the invariance of the condensation pressure and ensure the normal working of the unit.

Direct pressure control

For the YEWS-D unit, if necessary, the input water temperature/flow of the condenser should be controlled via feeling the pressure of the refrigerant directly.

The pressure of the refrigerant can also be used for controlling the efficiency of the cooling tower, which can also be used for controlling the wind door or wind turbine of the cooling tower, or control the flow of the cooling

Cooling tower

Pump

Cooling tower

or other cooli-

ng source

Cycling loop

Pump

water via tee bypass, as shown in the above diagram. It

aims at maintaining the low constant output pressure. However, for the R134a unit, it is beyond 3bar than the suction pressure. Therefore, the control can be realized via the certain setting value (higher than the expected suction pressure) the measure the suction pressure, or measuring out the suction pressure and with the pressure difference. No matter what situations, the flow and temperature of the cooling water should not exceed the allowable limit.

Inlet temperature control

For the system using the cooling tower, the simplest method is controlling the fanner rotation speed or wind valve (the pump should be equipped with the cooling tower of automatic adjustment), which should ensure the temperature of cooling water should be constant under the designed conditions, the water temperature of the inlet of condenser can be adjusted to be no less than 21

24 when the environment temperature is low.

If without the abovementioned methods or the cooling tower, the three ways recycling system can be adopted, which is based on the water temperature of input of condenser to be adjusted, showed in the above diagram. It aims at maintaining the low inlet temperature of the condenser, but not lower than 2124.

4.11 Power Connection

The standard unit is just used with the rating current of 380V350HZ, the minimum is 342V, while the maximum is 440V.

All the electrical wire should be in compliance with the local regulations. The suitable cable should be required to drill through the wire holes on the two sides of the unit.

The user has the responsibility to provide the overcurrent protection for the input current of Y ork unit according tot eh Chinese standards.

All the power of the unit should be passed one public isolated point (York will not provide it). Single-point supply lines connection

One power in 380V/3phase/50HZ with circuit protection in the scene should be provided to the unit, and then it is connected to the inlet terminal.

The power of control circuit should be outlet from the public power (emergency stop), then isolate the switch by supplying the electricity from the air breaker to the non-fuse and control the transformer.

4.12 Connection of Control Panel

The circuit with I/O switch input is 12VDC, while 220V AC for the switch output, and the circuit with I/O quantum analog input should be 5VDC and the shielded wire, just earth on the control panel. The shielded wire and power wire should be arranged separately to avoid the electrical interference. The power wire should be kept away in using the wire hole on the control panel.

The no-voltage contact must apply with 220V AC (the metal contact is suggested). If the no-voltage contact is one part of relay or contactor, the coil must adopt the standard resistance capacitance suppressor to restrain the interference. Make sure that the above precautions are followed to avoid the electrical interference, which may result in the fault on the unit or the controller, even damages.

The cable connected to these terminals can not exceed 7.5 meters.

4.13 Output Contact

Water pump starter

When the output of terminal 21 is 220V AC, the water pump can be started up. The contact combines with the routine startup and stop process to control the startup/stop of the pump.

Alarming contact

When the output of terminal 26 is 220V AC, the unit is in alarming status.

4.14 System Input

In order to provide reliable protection for power-cutting, the flow switch with the suitable model must be chosen. The flow switch for the chilled water is in series connected with the flow switch of the cooling water, and then connects with terminal 1 and terminal 13 on the mainboard.

Startup and stop with remote control

Connect the switch of remote control into terminal 8 and terminal 13 on the mainboard.

4.15 Connection Diagram

Electrical connection diagram

5.1 Safety Notice (1) Installation

After reading, please keep this technical manual well for reference at any time. Please also give this manual to other personnel operating this machine for reference.

Warning: Only the appointed accessory by our company can be used, and please ask man-ufacturer or authorized dealer to provide the corresponding technical installation, technical service. The aftermath of malfunction of controller or electric shock should be resulted from the improper installation of the controlling accessory. The user is prohibited to maintain the machine by himself, for the aftermath of electric shock or controller damage may be caused due to improper repair of the controller. Please consult with the manufacturer for any repair demand. (2) YORK-003 Control Panel

Notice: YORK-003 control panel must be installed on one stable panel without the

accumulative rain and snow, leaf or other wastes in the host. The intensive circuit generally passes through the installation center; also AC220V passes the control panel. As for the installation location of outdoor control panel, the principle of separation of strong and weak electricity should be followed to maintain the distance between the control panel and contactor is above 100mm. (3) XS08 Centralized Controller

Warning: XS08 centralized controller should be installed stably, otherwise, it may fall down to

cause body injury or damage on controller.

Warning: It is required to adopt the appointed wire to supply the electricity. Please do not share the electricity with other electric appliance to

Section 5 Control Center

avoid the danger due to overloading. It is required to use the fuse or breaker suited with the working pressure of controller. Please do not use the wire or fuse beyond the appointed grade.

(4) Earthing

Notice: The control panel of YORK-003 and shielding layer of transformer must be installed with the earthing wire. Please do not connect the earthing wire with the fuel gas pipe, water pipe, lightning protection conductor or earthing wire of telephone. It may result in the electric shock if it is earthed improperly. Please inspect re-gularly whether the connection between the ear-thing wire of controller and earthing end and earthing electrode of unit is firm or not.

(5) Operation

Warning: Do not press the key with the sharper to avoid damaging the controller. Do not twist or

drag the wire of the controller to avoid damaging the controller to further malfunction. Do not wipe the controller with the benzene, thinner or chemical cloth, otherwise, the controller may be decolored or the component should be in malfunction. Please immerse the cloth into the water with neutral detergent, then wipe after screwing out the water, the wipe the controller with dry cloth. Do not use much strength on the screen or connection part to avoid the color variation.5.2 Initialization Operation

Notice:After completing the installation and connectionof YEWS-D centralized controller, it

is required to perform the initialization operation before putting into running. (1) Situations For Initialization

When the centralized controller and control mainboard is interconnected to form the control system for the first

WARNING

NOTE

WARNING

NOTE

WARNING

NOTE