Johnson Controls YEWS Series Owner's manual

Supersedes:
EN
AP1105
-IOM01(0316)
YEWS Water Cooled Screw Chiller
(Water Source Heat Pump)
Installation, Operation and
Maintenance
Form No:AP1105-IOM01(1216) EN
YEWS High Efficiency Chiller With Single Compressor
STYLE E
Warning
The System is charged with refrigerant with a certain pressure
Improper operation during maintenance may cause serious damage to the system. All
maintenance shall be done by York authorized technician, following the guide in York
installation, operation and maintenance manual.

IMPORTANT!
READ BEFORE PROCEEDING!
GENERAL SAFETY GUIDELINES
This equipment is a relatively complicated apparatus. During installation, operation, maintenance or service,
individuals may be exposed to certain components or conditions including, but not limited to: refrigerants, oils,
materials under pressure, rotating components , and both high and low voltage. Each of these items has the
potential, if misused or handled improperly, to cause bodily injury or death. It is the obligation and
responsibilities of operating/service personnel to identify and recognize these inherent hazards, protect
themselves, and proceed safely in completing their tasks. Failure to comply with any of these requirements
could result in serious damage to the equipment and the property in which it is situated, as well as severe
personal injury or death to themselves and people at the site.
This document is intended for use by owner-authorized operating/service personnel. It is expected that this
individual posseses independent training that will enable them to perform their assigned tasks properly and
safely. It is essential that, prior to performing any task on this equipment, this individual shall have read and
understood this document and any referenced materials. This individual shall also be familiar with and comply
with all applicable governmental standards and regulations pertaining to the task in question.
In complying with YORK’s policy for continuous product improvement, the information contained in this
document is subject to change without notice. While YORK makes no commitment to update or provide
current information automatically to the manual owner, that information, if applicable, can be obtained by
contacting the nearest YORK Applied Systems Service office.
It is the responsibility of operating/service personnel to verify the applicability of these documents to the
equipment in question. If there is any question in the mind of operating/service personnel as to the applicability
of these documents, then prior to working on the equipment, they should verify with the owner whether the
equipment has been modified and if current literature is available.
CHANGEABILITY OF THIS DOCUMENT
Nomenclature
Y E W 100 H E A 50
Design Level
50-380V-3P-50Hz
53-400V-3P-50Hz
55-415V-3P-50Hz
64-460V-3P-60Hz
62-230V-3P-60Hz
A-HFC134a
H - High efficiency AC
B - High efficiency ITS
P - Premium efficiency AC
Unit Model
Screw Compressor
High Efficiency
YORK
Water Cooled
S -
Special Design
HP
Heat Pump
S
YEWS-E Water Cooling Screw Chiller/Heat Pump

NOMENCLATURE
1 GENERAL MANUFACTURER INFORMATION
1.1 INTRODUCTION
1.2 WARRANTY
1.3 SAFETY
1.4 RESPONSIBILITY FOR SAFETY
1.5 ABOUT THIS MANUAL
1.6 MISUSE OF EQUIPMENT
1.7 EMERGENCY SHUTDOWN
1.8 SAFETY LABELS
2 PRODUCT DESCRIPTION
2.1 INTRODUCTION
2.2 COMPRESSOR
2.3
2.4 REFRIGERANT CIRCUITS
2.5 CONDENSER
2.6 EVAPORATOR
2.7 POWER AND CONTROL PANEL
2.8 CONTROL PANNAL
2.9 MOTOR PROTECTION
2.10 KEYBOARD CONTROL
2.11OPTIONS
2.12 FUNCTIONAL DESCRIPTION
3 TRANSPRORTATION, HANDLING AND STORAGE
3.1 DELIVERY AND STORAGE
3.2 INSPECTION
3.3 RIGGING
4 INSTALLATION
4.1 GENERAL DESCRIPTION
4.2 LOCATION REQUIREMENTS
4.3 INSTALLATION OF VIBRATION ISOLATORS
4.4 PIPING CONNECTIONS
4.5 WATER TREATMENT
4.6 PIPEWORK ARRANGEMENT
4.7 CONNECTION TYPES &SIZES
4.8 REFRIGERANT RELIEF VALVE PIPING
4.9 ELECTRICAL CONNECTION
OIL SEPARATOR AND OIL SUMP
TABLE OF CONTENTS
1
1
1
1
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1
2
2
3
3
4
4
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5
5
5
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5
6
6
6
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7
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12
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15
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YEWS-E Water Cooling Screw Chiller/Heat Pump

4.10 CONDENSER COOLING WATER SYSTEM
4.12 POWER WIRING
4.13 CONTROL PANEL WIRING
4.14 220VAC OUTPUT
4.15 SYSTEM INPUT
5 CONTROL CENTER
5.1 SAFETY NOTICE FOR THE OPERATION OF THE CONTROLLER
5.2 INITIALIZATION OPERATIONS
5.3 INSTRUCTIONS ON THE OPERATION
5.4 INSTRUCTIONS OF DISPLAY INTERFACE
5.4.1 INITIALIZATION INTERFACE
5.4.2 HOME INTERFACE
5.4.3 STATUS DISPLAY
5.4.4 PARAMETER SETTING
5.4.5 CLOCK SETTING
5.4.6 FAULT INQUIRY
5.5 GENERAL PARAMETERS SETTING AND DEFULT VALUES
5.6 FAULT IMFORMATION
5.7 MODBUS PROTOCOL
6 COMMISSIONING
6.1 PREPARATION
6.2 FIRST TIME START-UP
7 OPERATION
7.1 GENERAL DESCRIPTION
7.2 START-UP
7.3 NORMAL RUNNING AND CYCLING
7.4 OTHER NOTES
7.5 RUNNING DETECTION
8 MAINTENANCE
8.1 GENERAL REQUIREMENTS
8.2 DAILY MAINTENANCE
8.3 COMPRESSOR OIL
8.4 OIL FILTER
8.5 CONDENSER AND EVAPORATOR
8.6 CHECKING SYSTEM FOR LEAKS
4.11 VARIABLE PRIMARY FLOW
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17
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20
25
25
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25
27
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43
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53
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60
YEWS-E Water Cooling Screw Chiller/Heat Pump

8.7 EVACUATION AND DEHYDRATION OF UNIT
8.8 WORKING CONDITIONS
8.9 SCHEDULED MAINTENANCE
9 TROUBLE SHOOTING
9.1 SYSTEM TROUBLE SHOOTING ANALYSIS
9.2 SENSOR CALIBRATION CHARTS
10 TECHNICAL DATA
10.1 UNIT PHYSICAL PARAMETERS
10.2 WATER PRESSURE DROP
10.3 PHYSICAL DATAS
10.4 STARTING/OPERATION LIMITS OF UNIT
10.5 FOUNDATION DIAGRAM
10.6 DIMENSIONS
11 SPARE PARTS
11.1 RECOMMENDED SPARES
11.2 RECOMMENDED COMPRESSOR OILS
12 DECOMMISSIONING,DISMANTLING AND DISPOSAL
12.1 GENERAL DESCRIPTION
13. INSTALLATION INSTRUCTIONS FOR THE HF68 FLOW SWITCHES
13.1 APPLICATION
13.2 PARAMETERS
13.3 FLOW ADJUSTMENT RANGE AND MEDIA TEMPERATURE RANGE
13.4 INSTALLATION
13.5 WIRING
13.6 STEPS TO ADJUST THE FLOW SWITCH SETTINGS
ATTACHED DRAWINGS 1: YEWS electrical drawing-compressor for 50Hz power
ATTACHED DRAWINGS 2: YEWS electrical drawing-main board (YEWS100H/130H/170H/200H/210H) for 50Hz power
ATTACHED DRAWINGS 3: YEWS electrical drawing-main board (YEWS215P) for 50Hz power
ATTACHED DRAWINGS 5: YEWS electrical drawing-compressor for 60Hz power
ATTACHED DRAWINGS 6: YEWS electrical drawing-main board (YEWS100H&130H&170H&200H) for 60Hz power
ATTACHED DRAWINGS 7: YEWS electrical drawing-main board (YEWS215P) for 60Hz power
ATTACHED DRAWINGS 8: YEWS field connection for 60Hz power
ATTACHED DRAWINGS 9: Transformer for230V/3P/60Hz Application
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YEWS-E Water Cooling Screw Chiller/Heat Pump
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ATTACHED DRAWINGS 4: YEWS electrical drawing-main board(YEWS100P/130P/170P/200P) for 50Hz power
82

1 GENERAL MANUFACTURER INFORMATION
1
1.1 INTRODUCTION
YORK YEWS chillers (heat-pumps) are manufactured to
the highest design and construction standards to ensure
high performance, reliability and adaptability for all types
of air conditioning installations. The unit is intended for
cooling (hot) water solution and is not suitable for purp-
oses other than those specified in this manual.
This manual contains all the information required for cor-
rect installation and commissioning of the unit, together
with operating and maintenance instructions.
The manuals should be read thoroughly before attempting
to operate or service the unit. All procedures detailed in
the manuals, including installation, commissioning and
maintenance tasks must only be performed by suitably
trained and qualified personnel.
The manufacturer will not be liable for any injury or
damage caused by incorrect installation, commissioning,
operation or maintenance resulting from a failure to
follow the procedures and instructions detailed in the
manuals.
1.2 WARRANTY
YORK warrants all equipment and materials against
defects in workmanship and materials for a period of
eighteen (18) months from date of shipment, or twelve
(12) months from commissioning, whichever occurs first,
unless labor or extended warranty has been purchased as
part of the contract.
The warranty is limited to parts only replacement and
shipping of any faulty part, or sub-assembly, which has
failed due to poor quality or manufacturing errors. All
claims must be supported by evidence that the failure has
occurred within the warranty period, and that the unit has
been operated within the designed parameters specified.
All warranty claims must specify the unit model, serial
number, order number and run hours/starts. Model and
serial number information is printed on the unit
identification plate.
The unit warranty will be void if any modification to the
unit is carried out without prior written approval from
YORK.
For warranty purposes, the following conditions must be
satisfied:
The initial start of the unit must be carried out by trained
personnel from an Authorized YORK Service Centre.
Only genuine YORK approved spare parts, oils, coo-
lants, and refrigerants must be used. All the scheduled
maintenance operations detailed in this manual must be
performed at the specified times by suitably trained and
qualified personnel.
Failure to satisfy any of these conditions will automa-
tically void the warranty. See Warranty Policy.
1.3 SAFETY
YEWS chillers are designed and manufactured by the
factory within ISO 9000 , Chillers satisfied all the runn-
ing limits required by the manual and conform to the
following Directives GB25131《Safety requirements of
Positive displacement and Centrifugal Water—chilling
Packages》
1.4 RESPONSIBILITY FOR SAFETY
Every care has been taken in the design and manufacture
of the unit to ensure compliance with the safety requir-
ements listed above. However, the individual operating or
working on any machinery is primarily responsible for:
Personal safety, safety of other personnel, and the
machinery.
Correct utilization of the machinery in accordance with
the procedures detailed in the manual.
YEWS-E Water Cooling Screw Chiller/Heat Pump

2
1.5 ABOUT THIS MANUAL
The following terms are used in this document to alert the
reader to areas of potential hazard.
A WARNING is given in this document to
identify a hazard, which could lead to personal
injury. Usually an instruction will be given, tog-
ether with a brief explanation and the possible
result of ignoring the instruction.
A CAUTION identifies a hazard which could
lead to damage to the machine, damage to other
equipment and/or environmental pollution.
Usually an instruction will be given, together
with a brief explanation and the possible result
of ignoring the instruction.
A NOTICE is used to highlight additional
information, which may be helpful to you but
where there are no special safety implications.
The contents of this manual include suggested best
working practices and procedures. These are issued for
guidance only, and they do not take precedence over the
above stated individual responsibility and/or local safety
regulations.
This manual and any other document supplied with the
unit are the property of YORK which reserves all rights.
They may not be reproduced, in whole or in part, without
prior written authorization from an authorized YORK
representative.
1.6 MISUSE OF EQUIPMENT
Suitability for Application
The unit is intended for cooling water and is not suitable
for purposes other than those specified in these
instructions. Any use of the equipment other than its
intended use, or operation of the equipment contrary to
the relevant procedures may result in injury to the
operator, or damage to the equipment. The unit must not
be operated outside the design parameters specified in
this manual.
Structural Support
Structural support of the unit must be provided as
indicated in these instructions. Failure to provide proper
support may result in injury to the operator, or damage to
the equipment and/or building.
Mechanical Strength
The unit is not designed to withstand loads or stresses
from adjacent equipment, pipework or structures.
Additional components must not be mounted on the unit.
Any such extraneous loads may cause structural failure
and may result in injury to the operator, or damage to the
equipment. The unit should only be lifted in accordance
with the instructions given in Section3 of this manual.
General Access
There are a number of areas and features, which may be a
hazard and potentially cause injury when working on the
unit unless suitable safety precautions are taken. (It is
important to ensure access to the unit is restricted to
suitably qualified persons who are familiar with the
potential hazards and precautions necessary for safe oper-
ation and maintenance of equipment containing high
temperatures, pressures and voltages.)
Pressure Systems
The unit contains refrigerant vapor and liquid under
pressure, release of which can be a danger and cause
injury.
The user should ensure that care is taken during
installation, operation and maintenance to avoid damage
to the pressure system. No attempt should be made to gain
access to the component parts of the pressure system
other than by suitably trained and qualified personnel.
Electrical
The unit must be earthed. No installation or maintenance
work should be attempted on the electrical equipment
without first switching power OFF, isolating and locking-
off the power supply. Servicing and maintenance on live
equipment must only be performed by suitably trained
and qualified personnel. No attempt should be made to
CAUTION
NOTE
WARNING
YEWS-E Water Cooling Screw Chiller/Heat Pump

3
gain access to the control panel or electrical enclosures
during normal operation of the unit.
Refrigerants and Oils
Refrigerants and oils used in the unit are generally non-
toxic, nonflammable and noncorrosive, and pose no spe-
cial safety hazards. Use of gloves and safety glasses is,
however, recommended when working on the unit. The
build up of refrigerant vapor, from a leak for example,
does pose a risk of asphyxiation in confined or enclosed
spaces and attention should be given to good ventilation.
High Temperature and Pressure Cleaning
High temperature and pressure cleaning methods (e.g.
steam cleaning) should not be used on any part of the
pressure system as this may cause operation of the
pressure relief device(s). Detergents and solvents, which
may cause corrosion, should also be avoided.
1.7 Emergency Shutdown
In case of emergency, the control panel is fitted with an
emergency stop switch (red)which, when operated by
pressing the emergency stop switch removes the electrical
supply the control system and the microprocessor
controller, thus shutting down the unit.
1.8 Safety Labels
The following labels are fixed to each unit to give
instruction, or to indicate potential hazards which may
exist.
White symbol on blue background For safe
operation, read the Instructions firstly.
Black symbol on yellow background Warning:
Hot surface
Black symbol on yellow background Warning:
Isolate all electrical sources of supply before
opening or removing the cover, as lethal voltages
may exist
Black symbol on yellow background General
attention symbol
YEWS-E Water Cooling Screw Chiller/Heat Pump

4
2.1 INTRODUCTION
YORK YEWS series chillers (Heat pumps) are designed
for water cooling (heating) and to be located inside
building (Equipment room).
2.2 COMPRESSOR
A semi-hermetic screw compressor is provided to ensure
high operational efficiency and reliable performance.
Capacity control is achieved through slide valve. The
compressor is a positive displacement type characterized
by two helically grooved rotors, which are manufactured
from forged steel. The motor operator operates at 50Hz or
60Hz to directly drive the male rotor, which in turn drives
the female rotor on the light film of oil.
Each compressor is direct drive, semi-hermetic, rotary
twin screw type and includes the following items:
Two screw rotors, manufactured from forged steel.
A cast iron compressor housing precisely machined.
A built-in high efficient oil separator
An internal discharge check valve can prevent rotor
backspin during shutdown.
A suction vapor cooled, high efficient and reliable semi-
hermetic motor has overload protection: thermistor and
current overload protection.
A suction vapor screen and a serviceable oil filter are
installed in the compressor housing. For YEWS P serie
units, the oil filter is placed on the oil supply line.
Refrigerant vapor is sucked into the void created by the
unmeshing of the five lobed male and six lobed female
rotors. Further meshing of the rotors closes the rotor
threads to the suction port and progressively compresses
the vapor in an axial direction to the discharge port. The
vapor is compressed in volume and increased in pressure
before exiting at a designed volume at the discharge end
of the rotor casing. Since the intake and discharge cycles
overlap, a resulting smooth flow of vapor is maintained.
2 PRODUCT DESCRIPTION
The rotors are housed in a cast iron compressor housing
precision machined to minimize the void between the
housing and the rotors. Contact between the male and
female rotor is primarily rolling on a contact band on each
of the rotor's pitch circle. It result in virtually no rotor
wear and increased reliability.
The compressor incorporates a complete antifriction bear-
ing design for reduced power input and increased relia-
bility. Four separated, cylindrical, roller bearings handle
radial loads. Angular-contact ball bearings handle axial
loads. Together they maintain accurate rotor positioning at
all pressure ratios, thereby minimizing leakage and maint-
aining efficiency.
Motor cooling is provided by refrigerant vapor from the
evaporator flowing across the motor. Over load protection
includes overheat and current overload protections.
For YEWS H serie units, oil is removed from the
refrigerant using a built-in oil separator, and then returned
back to the compressor for lubrication. A plug-in heater
and a float ball type oil level swithch are located in the
compressor.
Motor Starting
Star/Delta (S/D) open transition starter is used for
compressor motor starting. The S/D starter utilizes 3
motor contactors and a starting relay. The starter allows
inrush current to be limited to approximately 33%LRA for
the first 4~10 seconds, with current changing to normal
running current when the Delta connection is established.
When the microprocessor initiates a start signal to run a
compressor, the applicable relays are energized. The tran-
sition of the relay contacts enables the 'Star' connection of
the motor start. The 'Star' connection of the motor start is
enabled for 4~10 seconds, then motor switchs to the
'Delta' connection.
Capacity Control
The compressors should start at the minimum load
YEWS-E Water Cooling Screw Chiller/Heat Pump

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position and provide a capacity control within 25%~100%
by using one continuous function slide valves.
The capacity control valve at the minimum load position
when it starts up will ensure compressor starting at the
minimum motor load.
2.3 Oil separator and oil sump
YEWS system uses two stage oil separation designs, the
first stage is the compressor built-in oil separator, and the
second stage is the condenser internal oil separator. For
YEWS H serie units, all models has the oil sump located
in the first stage oil separator, the oil level should be
visible in the sight glass on compressor; but for YEWS P
serie units, the oil sump is located in the second stage oil
separator, there should be no visible oil level in the
compressor sight glass (the oil will be piped to the oil
sump inside the condenser).
All lubricant must flow through a renewable filter before
it is supplied to compressor to lubricate the bearings and
the rotors.
After lubricating the bearings, the oil is injected through
an orifice loacted in the closed thread near the suction end
of the rotors. The oil is automatically injected because of
the pressure difference between the discharge pressure and
the pressure at the suction end of the rotors. This
lubricates the rotors as well as provides an oil seal against
leakage around the rotors to assure refrigerant
compression (volumetric efficiency).
For YEWS P serie units, a photoelectric type oil level
switch is used，and an oil heater are locaded on the oil
sump.
2.4 Refrigerant Circuits
The refrigerant circuit has a compressor, oil separator,
evaporator, condenser and a liquid line. Liquid line
components include: a manual shut-off valve, throttle
device , liquid injection piping (just for HP and ITS).
2.5 Condenser
The water-cooled condenser is a cleanable shell and tube
type, with 19mm thermally enhanced seamless copper
tubes and a builtin subcooler.
The design working pressure is 1.0MPa (gauge) on the
waterside. Flange connection HG20615 is provided for
water piping. The condenser shell is equipped with a
relief valve whose active pressure is 20.7 Bar. The
condenser is manufactured and tested according to China
National Standard GB151.
For HP unit, the external surface of the condenser shell
should be covered with 19mm-thick flexible closed-cell
foam for heat insulation purpose.
2.6 Evaporator
The evaporator is a shell and tube, falling film type heat
exchanger equipped with a relief valve whose active
pressure is 20.7 Bar.
The evaporator is manufactured and tested according to
China National Standard GB151.
The external surface of the evaporator shell is covered
with 19mm-thick flexible closed-cell foam for AC&HP
unit and 38mm us used for ITS unit. The water box
connection is equipped with HG20615 flanges for easier
connecting.
2.7 Power and Control Panel
All controls are factory-wired and function tested. The
panel enclosures are designed according to IP22 and are
manufactured from powder-painted steel.
The panel is divided into power supply section, control
section and start section. Power supply section and
control section have separated hinged, latched, and gasket
sealed doors.
The power panel contains: compressor starting contactor,
control wiring, compressor contacting solenoid and
YEWS-E Water Cooling Screw Chiller/Heat Pump

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compressor overload protection module.
Compressor overload protection is achieved as following:
Motor protector sense the current of each phase of motor
current and the temperature of motor, and send
corresponding signals to the I/O Board.Then compare the
values with MLA setpoints and active to protect the motor
once the the values is higher than MLA setpoints.It
protects the compressor motors from damage due to:
Current overload, current imbalance (the error of the
current of each phase), miswire, motor over temperature,
uncalibrated, supply power phase loss.
The control panel include: Microcomputer keyboard, HMI
and microprocessor board.
2.8 Control panel
The HMI consists of a liquid crystal display, with light
emitting diode backlighting for outdoor viewing of
operating parameters and program points. It can display 8
rows and 120 characters in 2 languages (English or
Chinese). The keyboard has 20 keys, which is divided into
two kinds: Funtion keys and Programme keys.
The standard control function of microprocessor board
includes: chiller alarm contactor controlling, chilled water
pump controlling, chiller auto resetting when it is repower
on after a period of power off, optimizing the system
automaticly according to the running conditions
Unit operating firmware is stored in non-volatile memory
(Flash Memory) to protect chiller from failture for power
off. All field programmed setpoints are retained in the
EPROM register. A lithium battery backed real time clock
(RTC) supply the clock for the system control, and the
battery has 3 years memory.
2.9 Motor protection
The microprocessor provides the overcurrent protection to
ensure that the motor is free from the damages due to
excessive voltage and other overcurrent problems.
After the Star/Delta starter started for more than 10
seconds, the microprocessor will shut down and lock the
chiller for fault if the current exceeds the current
setpoints. It is required to reset the system switch
manually to eliminate the fault before restart the system.
And prior to start the chiller which stopped due to
overcurrent, chec-king should be done on the motor,
wiring and refrigerant system.
When it is found that the current is lower than 10% of
MLA (Max Loading Amps), the low current protection
will be initiated and the unit should be stopped. In that
case, prior to restart the system, unit resetting should be
done manually.
Motor protector
Motor protector is used to protect motor from overheat,
There are three PTC (Positive Temperature Coefficient)
thermistor installed in each phase of motor winding. The
resistance of thermistor will keep in 1K when the
temperature is lower than 125℃, however, the resistance
of thermistor will increase as its temperature rise. When
the resistance value of sensor reach upto 13K, the motor
protector will be active and cut off the power supply of
motor. The chiller is not allowed to restart until the motor
is cooled down and the resistance value of sensor drop
down to 3.25K.
2.10 Keyboard control
Display
The parameters of each refrigerant circuit can be
displayed in 2 languages (English or Chinese),
All the displayed parameters are listed as follows:
Entering/Leaving chilled water temperature
Entering/Leaving cooling water temperature(Entering/le-
aving hot water temperature are diaplayed in heatpump
mode).
Time and date, start and stop time at ordinary days,
arrangement on holidays and status of manual setting.
YEWS-E Water Cooling Screw Chiller/Heat Pump

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Compressor running hours and starting times.
Compressor running status.
System Suction/Discharge pressure, oil pressure, disch-
arge temerature.
Percentage of compressor current to Full Load Amps.
Cutout value and setpoints: Leaving Chilled (Hot) Water
Temperature, Low Evaporator Pressure , High Discharge
Temperature/Pressure , High/Low Amps , Low Chilled
Water Temperature , High Diacharge Pressure Unload,
High Compressor Amps unload.
Input
Setting the chilled (hot) water temperature.
Clock
Setting time, daily and holiday start/stop schedule.
Programming
Cutout setpoints: Low Evaporator pressure, High
Discharge Pressure, Low Evaporator temperature, High
Discharge Temperature, High Discharge pressure
unloading, OCC.
2.11 OPTIONS
YORK ISN building automation system can directly send
the communication signal to the standard control panel
through the standard RS485 connection.
Flow Switch
The gate type water flow switch has 10.3 bar DWP, which
is applicable to chilled water and cooling water lines.
25mm Spring Isolators
Level adjustable, spring and cage type isolators for
mounting under the unit base rails (Field mounted).
2.12 Functional Description
Low pressure liquid refrigerant enters the cooler and is
evaporated and superheated by the heat energy absorbed
from the chilled water passing through the cooler tube.
These low pressure vapor is sucked by the compressor
where the pressure and temperature are increased. The
high pressure and temperature refrigerant vapor combined
with oil is discharged into the oil separator, there, most of
the oil is separted and remaind in the oil reservoir. The oil
free vapor then enter the condenser and is condensed. The
fully condensed and subcooled liquid refrigerant then
enters the expansion valve where pressure reduction and
further cooling takes place before returning to the cooler.
YEWS-E Water Cooling Screw Chiller/Heat Pump

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YEWS-E Water Cooling Screw Chiller/Heat Pump
YEWS-E SYSTEM FLOW CHART-1（for YEWS100H/130H/170H/200H/210H）
High pressure refrigerant line Low pressure refrigerant line Oil line
Condenser
with internal oil separator
Compressor
Oil Eductor
Orifice
Evaporator

YEWS-E SYSTEM FLOW CHART-2（for YEWS100P/130P/170P/200P ）/215P
YEWS-E Water Cooling Screw Chiller/Heat Pump
Condenser
with internal oil separator
Compressor
Oil Eductor
Orifice
Evaporator
Oil Filter
High pressure refrigerant line Low pressure refrigerant line Oil line
9

3 TRANSPRORTATION, HANDLING AND STORAGE
3.1 DELIVERY AND STORAGE
To ensure consistent quality and maximum reliability, all
units are tested and inspected before leaving the factory.
The chiller may be ordered and shipped in any of the
following forms:
Form 1 (shipped complete)
Form 2 (shipped without refrigerant charge)
Units are containing nitrogen or refrigerant and YORK
“L” oil （YORK “W” oil in HP units）under
pressure. Units are shipped without export crating unless
crating has been specified on the Sales Order.
If the unit is to be put into storage, prior to installation, the
following precautions should be observed:
Ensure that the unit is not exposed to rain.
Ensure that all openings, such as water connections, are
securely capped.
The unit should be stored in a location where there is
minimal activity to limit the risk of accidental physical
damage.
To prevent inadvertent operation of the pressure relief
devices the unit must NOT be hot water or steam cleaned.
It is recommended to let the functionary on the storage
site keep the key of the control board.
It is recommended that the unit be periodically inspected
during storage.
If the unit is stored longer than six months, the relative
requirements for Long-Term Storage (50.20-NM9 /50.20-
CL9 / 50.20-NM1) must be followed.
3.2 INSPECTION
The unit shipment should be checked on arrival to see that
all major pieces, boxes and crates are received. Each unit
should be checked on the trailer or rail car when received,
before unloading, for any visible signs of damage. Any
damage of signs of possible damage must be reported to the
transportation company immediately for their inspection.
When received at the job site,all containers should be
opened and the contents checked against the packing list.
Any material shortage should be reported to YORK
immediately.
3.3 RIGGING
Each unit has four lifting holes(two on each end) in the end
sheets which should be used to lift the unit. Care should be
taken at all times during rigging and handling to avoid
damage to the unit and its external connections. Lift only
using holes shown in Figure 3-1.
If optional shipping skids are used, remove them before
lowering the unit to its mounting position. Rig the uni to its
final location on the floor or mounting pad by lifting the
unit (or shell assembly) with an overhead lift and lower the
unit to its mounting position.
Don't move the unit on rollers, nor lift it by forklift.
CAUTION
YEWS-E Water Cooling Screw Chiller/Heat Pump
10

Figure 3-1 Rigging
YEWS-E Water Cooling Screw Chiller/Heat Pump
RIGGING INSTRUCTION
For liftin unit use spreader bar with 4 separate slings length of lifting elements must be adequate to clear all projections, the
strength of liting elements must be suitable for lifing weight.
11

4 INSTALLATION
4.1 General description
This instruction describes the installation of a model
YEWS Rotory Scew Liquid Chiller/Heatpump. The unit is
shipped as a single factory assembled, piped, wired and
nitrogen or refrigerant charged package, requiring a
minimum of field labor to make chilled water connections,
condenser water connections, refrigerant atmospheric relief
connections, and electrical power connections.
Acording the requirement of bargain, YORK representat-
ive should provide the following service: Installation
checking and, Initial starting and so on.
The YORK Warranty will be voided if the following
restrictions are not adhered to:
1. No valves or connections should be opened under any
circumstances because such action will result in loss of the
factory charged refrigerant or nitrogen.
2. Do not dismantle or open the Unit for any reason except
under the supervision of a YORK representative.
3. Do not make final power supply connections to the
compressor motor or control panel.
4. Do not charge the compressor with oil.
5. Do not attempt to start the system.
6. Do not supply the evaporator with hot water(The
temperature Limit is 100 F,38℃)or steam.
4.2 Location Requirements
The unit should be located in an indoor location where
temperature ranges from 4℃~ 43℃.The altitude shoude be
less than 2000 meter.
The units are furnished with neoprene vibration isolator
mounts for basement or ground level installations. Unit
may by located on upper floor levels providing the floor is
capable of supporting the total unit operating weight (in
this application, the spring isolator is prefered).
A level floor, mounting pad or foundation must be pro-vided
by others, capable of supporting the operating wei-ght of the
unit
Clearances should be adhered to as follows:
Rear, Ends and Above Unit - 610mm
Front of Unit - 914mm
Tube Removal - See following table
Model Tube removal space
YEWS100 2100mm
YEWS130/170/200/210 2650mm
YEWS215 3800mm
4.3 Installation of Vibration Isolators
The optional vibration isolators can be loose shipped with
the chiller.
Please refer to the foundation figures in Section 10 to decide
proper installation position for the units.
Fixation-Installation
There are two methods: rubber pad and spring isolator.
Locating and installing isolator pads
The isolator pads should be located in accordance with the
floor layout of the dimensional product drawing. After the
isolator pads have been placed into position on the floor,
lower the unit onto the pads. Make sure the pads are even
with the edges of the mounting feet. When the unit is in
place, remove the rigging equipment and check that the
chiller is level, both longitudinally and transversely. See the
following Fig.
The longitudinal alignment of the unit should be checked by
placing a level on the top center of the evaporator shell
under the compressor. Transverse alignment should be
checked by placing a level on top of the shell end sheets at
each end of the unit.
The unit should be level within 6.4mm from one end to the
other end and from front to rear. If the chiller is not level
within the amount specified, lift it and place shims between
the isolation pad and the tube sheets.
YEWS-E Water Cooling Screw Chiller/Heat Pump
12

YEWS-E Water Cooling Screw Chiller/Heat Pump
SYSTEM OPERATING WEIGHT
Kg
UP TO 7423
Lbs.
UP TO 16365
PART NUMBER
028W14462-000
Checking the Isolator Pads Deflection
All isolator pads should be checked for the proper deflection
while checking the level of the unit. Each pad should be
deflected approximately 4 mm (0.15"). If an isolator pad is
under deflected, shim should be placed between the unit
tube sheet and the top of the pad to equally deflect all pads.
Installing Option Spring Isolators
In order to mount spring isolators, first remove the nuts and
screws on the spring isolator supports. Before the unit is
positioned, the isolator supports should be bolted to the unit
support. Position the 4 spring isolators, screw out the
adjusting screws on each isolator until they reach out to
match the isolator support holes. Then lower down the unit
on the adjusting screws. See the following Fig.
The leveling bolts should now be rotated one (1) turn at a
time, in sequence, until the unit end sheets are clear of the
floor or foundation by 22 mm (7/8") and the unit is level.
Check that the unit is level, both longitudinally and
transversely. If the leveling bolts are not long enough to level
unit due to an uneven or sloping floor or foundation, steel
shims (ground, if necessary) must be added beneath the
isolator assemblies as necessary.
After the unit is leveled, wedge and shim under each corner
to solidly support the unit in this position while piping
connections are being made, pipe hangers adjusted and
connections checked for alignment. Then the unit is filled
with water and checked for leaks. The leveling bolts should
now be finally adjusted until the wedges and shims can be
removed the unit should now be in correct level position,
clear of the floor or foundation and without any effect from
the weight of the piping.
13

4.4 Piping Connections
General Requirements
The following piping recommendations are intended to
ensure satisfactory operation of the unit. Failure to follow
these recommendations could cause damage to the unit, or
loss of performance, and may invalidate the warranty.
The maximum flow rate and pressure drop for the
evaporator and condenser must not be exceeded at
any time. Refer to Section 10 for details.
A flow switch must be directly in series with the evapo-
rator/ condenser and wired back to the control panel using
screened cable. For details refer to Electrical Connection
.This is to prevent damage to the evaporator/ condenser
caused by inadequate liquid flow. A paddle type flow swit-
ches are suitable for 10 bar working pressure.
The chilled water pump should be installed in the entering
water pipe. Pipework and fittings must be separately supp-
orted to prevent any loading on the unit. Flexible conn-
ections are recommended which will also minimize trans-
mission of vibrations to the building. Flexible connections
must be used if the unit is mounted on antivibration mounts
as some movement of the unit can be expected in normal
operation.
Pipework and fittings immediately next to the evaporator
should be readily dismantled to enable cleaning prior to
operation, and to facilitate visual inspection of the heat
exchanger nozzles.
A strainer must be mounted on the waterside of the
evaporator and condenser respectively, preferably of 40
meshes, fitted as close as possible to the liquid inlet conn-
ection, and provided with a local water cut-off switch.
The evaporator must not be exposed to too high flushing
velocities or debris deposited during flushing. It is recom-
mended that a suitably sized by-pass and valve arrang-ement
be installed to allow flushing of the pipework sys-tem. The
by-pass can be used during maintenance to isol-ate the
evaporator without disrupting flow to other units.
Thermometer and pressure gauge connections should be
provided on the inlet and outlet connections of the evap-
orator and condenser.
Drain and vent valves (by others) should be installed in the
connections provided in the cooler and condenser liquid
heads. These connections may be piped to drain if desired.
Any debris left in the water piping between the
strainer and cooler could cause serious damage to
the tubes in the cooler and must be avoided. The
installer/user must also ensure that the quality of
the water in circulation is adequate, without any
dissolved gases, which can cause oxidation of steel
parts within the cooler.
Fig 4-1 Diagram of cooling water and chilled wa-
ter pipe connection
YEWS-E Water Cooling Screw Chiller/Heat Pump
CAUTION
CAUTION
ISOLATORS SPRING
Kg
UP TO 3114
3115 TO 4453
4454 TO 5526
5527 TO 6927
6928 TO 8288
SYSTEM OPERATING WEIGHT
Lbs.
UP TO 6865
6866 TO 9818
9819 TO 12182
12183 TO 15272
15273 TO 18272
029W18479-001
029W18479-002
029W18479-003
029W18479-004
029W18480-001
PART NO
14

Quality requirement of water used in chiller
Name
PH value(25℃)
Conductivity(25℃)
Chloridion
Sulphate ion
Acid wastage
Total Hardness
Calcium Hardness
SiO2
Unit
-
μs/cm
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
6.5～8.0
＜800
＜200
＜200
＜100
＜200
＜150
＜50
Corrosion
X
X
X
X
Target Allowable value Fouling
X
X
X
X
Notes:
1. The user should make regular inspections on the water
quality before installation and in the process of using. If the
water quality does not meet the demands of using, the heat-
exchange tubes will be in the danger of fouling ,corrupting
and even leakage when using the “Defective” water for
long term.
2. Corrupting testing about the influence of using “Def-
ective” water whose qulity exeed the limits for long term
shows that, the chiller will fail to run normally due to the
heat-exchange tubes corrupting and leakage.
3. Fouling testing about the influence of using“Defecti-
ve” water whose qulity exeed the limits for long term
shows that, the chiller will has a decreaing on capacity due
to the heat-exchange tubes fouling.
4. The water should be drained out if the unit will stop for a
long time, it is suggested that the heat exchanging pipe
should be cleaned after each long-term stop.
5. User should be responsibility for the loss caused by the
poor water quality.
4.6 Pipework Arrangement
The following are suggested pi4pework arrangements for
single unit installations. For multiple unit installations, each
unit should be piped as per relative drawings.
4.7 Connection Types &Sizes
Please refer to Section 10 for connection sizes of each
model.
The piping connections of evaporator and condenser are
HG20615 welded flanges.
4.8 Refrigerant Relief Valve Piping
The evaporator and condenser are each protected against
internal refrigerant overpressure by refrigerant relief valves.
It is recommended that each valve should be piped to the
exterior of the building so that when the valve is activated
the release of high pressure gas and liquid cannot be a
danger or cause injury.
The size of any pipework attached to a relief valve must be
of sufficient diameter so as not to cause resistance to the
operation of the valve. Unless otherwise specified by local
regulations, the internal diameter depends on the length of
pipe required and is given by the following formula:
YEWS-E Water Cooling Screw Chiller/Heat Pump
4.5 Water Treatment
The unit performance provided in the Design Guide is
2
based on a fouling factor of (0.044m .℃/KW for
2
condenser and 0.0176m .℃/KW for evaporator). Dirt,
scale, grease and certain types of water treatment will
adversely affect the heat exchanger surfaces and therefore
the unit performance. Foreign matter in the water
system(s) can increase the heat exchanger pressure drop,
reducing the flow rate and causing potential damage to the
heat exchanger tubes. YORK recommends that a water
treatment specialist should be consulted to determine
whether the proposed water composition will adversely
affect the evaporator materials of carbon steel and copper.
The pH value of the water flowing through the evaporator
must be kept in a range between 6.5 and 8.0. The water
quality of chiller should be in accordance with local code.
15