YVWA Water-Cooled Variable Speed Screw Chiller

Capacities Ranging from 125-300 TR (440-1,055 kW)

We've manufactured and designed the YVWA Water-Cooled Variable Speed Screw Chiller from YORK® to address four primary requirements – efficiency, application flexibility, sustainability, and confidence. With infinite chiller configurations to help you achieve your goals, our YVWA chiller features the ability to reduce compressor speed, which means increased energy savings and a reduced carbon footprint. 

Our YVWA Water-Cooled Variable Speed Screw Chiller delivers superior energy performance at all operating hours. Enjoy the flexibility and convenience of just one chiller for many applications.

 

• Reduce compressor speed and increase efficiency as much as 30% – Strike the right balance between capital cost, ownership cost, and energy efficiency by tailoring and tuning configurations.
• Flexibility – The YVWA chiller is capable of handling the high pressures associated with ice thermal storage or heat pump applications with the highest available efficiencies.
• Smaller environmental footprint – Reduces the refrigerant charge up to 30% and utility emissions as much as 30%.
• Feel confident with a proven performer – From inventing chiller VSD technology in 1979 to over 2,500,000 TR of VSD screw compressors operating today, we back you with unrivaled technological experience and the world's largest service organization.

 

For over 135 years, Johnson Controls has raised the
bar of chiller design and customer expectations. We are
raising the bar again with a leap forward in water-cooled
screw compressor chiller technology. Continuing the history
of innovation in both compressor design and variable
speed drive (VSD) technology, Johnson Controls proudly
introduces the YORK® YVWA.
The YORK YVWA chillers provide superior performance.
Higher efficiency heat exchangers coupled with variable
speed operation and smart controls elevate the system
efficiency to a whole new level. The resulting benefit from
YVWA is much greater than the sum of its parts.
Efficiency: Reduce your consumption
YVWA chillers are Johnson Controls’ most efficient watercooled
screw chillers. The design includes the latest
technology such as hybrid falling-film evaporators to give
the customer maximum efficiency and reduced refrigerant
charge compared to previous flooded evaporator designs.
With up to a 30% improvement in real world efficiency
versus current products, YVWA sets the new standards
for lowering energy use.
Flexibility: Designed for the customer
The YVWA was designed with the customer in mind.
YVWA chillers are capable of providing a variety of cooling
and heating applications and are compatible with
open- or closed-circuit cooling towers, dry air coolers, or
adiabatic coolers. The YVWA’s flexibility, including heat
recovery and heat pump capability, makes it a perfect fit
for all applications.
Sustainability: Improve your environmental footprint
YVWA lowers both direct and indirect impact on the environment.
It uses HFC-134a refrigerant which has zero
ozone depletion potential (ODP). The design minimizes
the quantity of refrigerant used in the system. Every
YVWA model helps LEED projects earn the Energy and
Atmosphere Credit 4. HVAC systems are one of the
largest consumers of electricity in commercial buildings
and the largest portion of green house gasses is created
by carbon dioxide generated from electric power plants.
YVWA chillers reduce the electricity usage, thereby contributing
to reducing greenhouse gases and helping keep
the planet cool.

Confidence: Proven performance provides peace
of mind
The YVWA design is proven by years of success with the
previous generation of YORK VSD water-cooled screw
chillers with thousands of machines operating in more
than one hundred countries.
YVWA is configurable to be the perfect fit for your
unique needs. YVWA offers an array of options that can
be tailored and tuned to match the capacity, efficiency
sound and footprint for your specific application. Several
variations of condenser and evaporator arrangements,
alternative compressor head ratios, sound reduction
kits, and controls schemes are available to meet specific
requirements for your site.
AHRI CERTIFICATION PROGRAM
The performance of the YORK YVWA chiller has been
certified to the Air Conditioning, Heating, and Refrigeration
Institute (AHRI) as complying with the certification
sections of the latest issue of AHRI Standards 550/590
and 551/591. Under this Certification Program, chillers are
regularly tested in strict compliance with these Standards.
This provides an independent, third-party verification of
chiller performance.
COMPUTERIZED PERFORMANCE RATINGS
Each chiller is custom-matched to meet the individual
building load and energy requirements. A variety of
standard heat exchangers and pass arrangements are
available to provide the best possible match.
It is not practical to provide tabulated performance for each
combination, as the energy requirements at both full and
part load vary significantly with each unique component
arrangement. Computerized ratings are available through
each Johnson Controls sales office. Each rating can be
tailored to specific job requirements, and is part of the
AHRI Certification Program.
OFF-DESIGN PERFORMANCE
Since the vast majority of its operating hours are spent
at off-design conditions, a chiller should be chosen not
only to meet the full load design, but also for its ability
to perform efficiently at lower loads. It is not uncommon
for chillers with the same full load efficiency to have an
operating cost difference of over 30% due to differences
in off-design (part-load) efficiencies.
Part load information can be easily and accurately generated
by use of the computer. And because it is so important
to an owner’s operating budget, this information has now
been standardized within the AHRI Certification Program
in the form of an Integrated Part Load Value (IPLV), and
Non-Standard Part Load Value (NPLV).
The current IPLV/NPLV rating from AHRI Standards
550/590 and 551/591 much more closely tracks actual
chiller operation, and provides a more accurate indication
of chiller performance than the previous IPLV/APLV rating.
A more detailed analysis must take into account actual
building load profiles, and local weather data. Part load
performance data should be obtained for each job using
its own design criteria.
Chillers conform to the following Standards and Codes:
1. AHRI 550/590 and 551/591 - Water Chilling Packages
using the Vapor Compression Cycle.
2. GB/T 18430.1 - Water Chilling (Heat Pump) Packages
Using The Vapor Compression Cycle - Part 1:
Water Chilling (Heat Pump) Packages For Industrial
& Commercial And Similar Applications.
3. GB25131 - Safety Requirements For Water Chillers
(Heat Pump) Using The Vapor Compression Cycle.
4. GB150/151 - Steel Pressure Vessels/Tubular Heat
Exchangers.
5. ANSI/ASHRAE 34 - Number Designation And Safety
Classification Of Refrigerants.
6. ASHRAE 90.1 - Energy Standard For Buildings Except
Low-Rise Residential Buildings.
7. Machinery Directive (2006/42/EC)
8. EMC Directive (2004/108/EC)
9. Pressure Equipment Directive (97/23/EC)
10. Safety Code for Mechanical Refrigeration (EN 378-2)
11. Safety of machinery - Electrical Equipment of Machine
(EN 60204-1)
12. Manufactured in an EN ISO 9001 accredited organization
13. ISO 9614 – Determination of sound power levels of
noise sources using sound intensity
14. Conform to CE Testing Services for construction of
chillers and provide CE Listed Mark.

SEMI-HERMETIC YORK SCREW COMPRESSORS
The direct-drive, semi-hermetic rotary screw compressor
incorporates advanced technology in a rugged design.
The continuous function, microprocessor controlled VSD
provides smooth capacity control from 100% down to
20% chiller capacity. State-of-the-art screw compressor
design and manufacturing ensures optimal efficiencies
at all chiller load points. With no unloading steps or slide
valves in the compressor, the YVWA variable speed driven
compressor has 50% fewer moving parts than fixed speed
compressors with slide valves. The YVWA compressor is
one of the most efficient and reliable screw compressors
in the industry.
EVAPORATOR
The evaporator is a shell and tube, hybrid falling film type
heat exchanger. It contains a balance of flooded and falling
film technology to optimize efficiency, minimize refrigerant
charge, and maintain reliable control. A specifically
designed distribution system provides uniform refrigerant
flow for optimum performance.
CONDENSER
The condenser is a shell and tube type, with a discharge
gas baffle to prevent direct high velocity impingement on
the tubes. The baffle is also used to distribute the refrigerant
gas flow properly for the most efficient heat transfer.
An integral sub-cooler is located at the bottom of the
condenser shell providing highly effective liquid refrigerant
subcooling to provide the highest cycle efficiency .
REFRIGERANT CIRCUIT
The YVWA has one independent refrigerant circuit per
compressor. An electronic expansion valve (EEV), controlled
by the unit panel, accommodates varying head
and load conditions. The condenser shell is capable of
storing the entire system refrigerant charge during servicing.
Optional service valves are available to facilitate
the removal of refrigerant. The sub-cooling economizer
(plate heat exchanger type), controlled by the unit panel,
meters some refrigerant gas to the compressor to reduce
energy consumption.
COMPLETE FACTORY PACKAGE
Each unit is shipped as a complete factory package,
completely assembled with all interconnecting refrigerant
piping and internal wiring and ready for field installation.
Prior to shipment, each individual chiller undergoes an
extensive testing procedure, ensuring workmanship is the
highest quality and that the initial start-up is trouble-free.
Before leaving the factory, each refrigerant circuit is factory
pressure tested, evacuated and then fully charged
with HFC-134a refrigerant and oil. An operational test is
performed with water flowing through the evaporator and
condenser to ensure each circuit functions correctly.
ELECTRICAL
All controls and motor starting equipment necessary for
unit operation are factory wired and function tested. There
are no surprises at start-up; the unit will start up right the
first time and every time. The standard unit is equipped
with circuit breaker for electrical connections. The chillers
come with a single point power connection and are supplied
with a factory mounted and wired control transformer
that powers all unit controls from the main unit power
supply. The transformer utilizes scheduled line voltage
on the primary side and provides 115V/1Ø on secondary.
All exposed power wiring is routed through liquid-tight,
UV-stabilized, non-metallic conduit.
VSD Power/Control Panel includes main power
connection(s), VSD contactors, current overloads, and
factory wiring. All display and control features can be accessed
through the keypad and control display access
door, eliminating the need to open the main cabinet doors.
BUILDING AUTOMATION SYSTEM CAPABILITIES
The E-Link Gateway provides an economical and versatile
connection between Johnson Controls equipment
and open/standard protocols. It efficiently manages the
communication protocols currently used by Johnson
Controls equipment, exposing the data in a consistent,
organized, and defined fashion. A simple switch selection
allows configuration of the required equipment profile and
output protocol, which reduces equipment connectivity
startup time .

The microcomputer control center provides automatic
control of chiller operation including compressor start/stop
and load/unload anti-recycle timers, chilled liquid pump,
unit alarm contacts and run signal contacts. The microcomputer
control center comes online as soon as the main
power switch on the unit is switched on; immediately, the
microcomputer control center will begin to continuously
monitor all variables.
The microprocessor controls the unit’s capacity by matching
the actual leaving chilled liquid temperature (LCHLT)
to the user-defined setpoint. Factors that may cause the
system’s actual LCHLT to fluctuate are changes in load,
and chilled liquid loop flow rate and volume. The controls
system logic monitors the rate at which the LCHLT is approaching
the setpoint to ramp up or down compressor
capacity as required. The variable frequency drive allows
the compressor capacity to match the load.
Display Data
• Leaving Chilled Liquid Temperature
• Returning Liquid Temperature
• Lead System (if applicable)
• Compressor Capacity (% of Full Load Amps)
• VSD Output Frequency / Compressor Speed
• Compressor Run Hours
• Compressor Number of Starts
• Oil Pressure
• History Data for Last Twenty Normal Shutdowns
• History Data for Last Ten Shutdown Faults
Programmable Setpoints
• Display Language
• Chilled Liquid Cooling Mode
• Local or Remote Control
• Display Unit
• Remote Temperature Reset
• Remote Current Limit
• Leaving Chilled Liquid Setpoint and Range
• Maximum Remote Temperature Reset
• Leaving Condenser Liquid Setpoint and Range (Heat
Pump Mode Only)
Johnson Controls’ systems or another vendor’s systems
can incorporate these setpoints and data outputs to give
the customer a complete understanding of how the system
is running through a Building Automation System.
Extreme Conditions - During extreme or unusual conditions
the chiller control system will avoid shut-down by
varying capacity. By monitoring motor current and suction
and discharge pressures, the chiller can maintain
maximum available cooling output without shutting down.
Unit Safeties are provided for the chiller to perform autoreset
shut down for the following conditions:
• Out of range leaving chilled liquid temperature
• Under voltage
• Flow switch operation.

All options factory mounted unless otherwise noted.
SOUND ATTENUATION
The standard chiller configuration is equipped with acoustic
treatments on the refrigerant lines, compressors, and oil
separators. There are several sound attenuation options
available to further reduce sound at its source thereby
meeting local sound level regulations.
HEAT EXCHANGER OPTIONS
FACTORY INSULATION OF EVAPORATOR – Factoryapplied
thermal insulation of the flexible, closed-cell plastic
type, 3/4” (19mm) thick is attached with vapor-proof cement
to the evaporator shell, flow chamber, evaporator
tube sheets, suction connection, water boxes and nozzles,
and (as necessary) to the auxiliary tubing. Insulation can
also be provided on the condenser if desired to meet
specific application needs, such as heat recovery or heat
pump duty. This insulation will normally prevent condensation
in environments with relative humidity up to 75%
and dry bulb temperatures ranging from 50° to 90°F (10°
to 32°C). 1-1/2” (38mm) thick insulation is also available
for relative humidity up to 90% and dry bulb temperatures
ranging from 50° to 90°F (10° to 32°C).
DOUBLE THICK INSULATION – Double Thick (1-1/2”)
insulation provided on the evaporator if desired, for specific
applications, such as glycol chilling.
FLANGE KIT – Provides contractor with the couplings
best suited to tie into the chilled liquid piping; option can
be selected separately for the evaporator and condenser.
Options include:
• HG 150 psig (10.3 barg) raised-face weldable flanges,
for applications where field coupling has existing
flanges. Flanges are field-welded by contractor. Also
available in 300 psig (20.6 barg)
• HG 150 psig (10.3 barg) raised-face flanges with couplings,
for applications where field coupling has existing
flanges. Flanges are field-mounted by contractor.
Also available in 300 psig (20.6 barg).
NOZZLE OPTIONS/LIQUID OPTIONS – Two- and threepass
nozzle arrangements available only in pairs shown
and for all shell codes. Any pair of condenser nozzles
may be used in combination with any pair of evaporator
nozzles.
THREE-PASS EVAPORATOR – The standard evaporator
is constructed with two chilled liquid passes through the
evaporator. The three-pass option is recommended for
use in brine applications or where a greater liquid temperature
difference is required without sacrificing efficiency.
ONE- OR THREE-PASS CONDENSER – The standard
condenser is constructed with two liquid passes through
the condenser. The one-pass option is recommended
for use in series counter-flow applications; the three-pass
option is recommended for use in heat pump applications
where high temperature differences are required. The
one- or three-pass options allow for customized cooling
applications without the sacrifice of efficiency.
NOZZLE OPTIONS/LIQUID OPTIONS – Two- and threepass
nozzle arrangements available only in pairs shown
and for all shell codes. Any pair of condenser nozzles
may be used in combination with any pair of evaporator
nozzles.
CONTROLS OPTIONS
BUILDING AUTOMATION SYSTEM INTERFACE (TEMPERATURE)
- Factory installed option to accept a 4 to
20 mA or a 0 to 10 VDC input to allow remote reset of the
Leaving Chilled Liquid Temperature Setpoint. The setpoint
can be positively offset upwards up to 40°F (22.2°C). This
option is useful for ice storage or process applications or
for periods where higher chilled liquid temperatures are
adequate for low loads. Available alone or in combination
with BAS Load Limit.
BUILDING AUTOMATION SYSTEM INTERFACE (LOAD
LIMIT) - Factory installed option to accept a 4 to 20 mA
or a 0 to 10 VDC input to allow remote reset of the Load
Limit Setpoint. The setpoint can limit system demand from
30-100%. Available alone or in combination with BAS
Temperature Reset.
E-Link – The E-Link Gateway provides full communication
to Building Automation Systems, including BACnet (MS/
TP), Modbus, LON and N2.
THERMAL STORAGE – Provides special control logic
and modifications to produce leaving chilled brine temperatures
below 40°F (4.4°C) primarily at times of low cooling
load (night time). Option can be used to produce ice
to supplement cooling and significantly decrease energy
costs. The capability of the chiller is enhanced by using
both ice and chilled liquid simultaneously during times of
peak cooling needs.
GENERAL OPTIONS
FLOW SWITCH ACCESSORY - Vapor proof SPDT,
NEMA 3R switch, 150 psig (10.3 barg) DWP, -20°F to 250°F (-29°C to 121°C) with 1” NPT (IPS) connection
for upright mounting in horizontal pipe (This flow switch
or equivalent must be furnished with each unit for chilled
liquid loop.). A condenser liquid flow switch is optional.
(Field mounted)
DIFFERENTIAL PRESSURE SWITCH – This 3-45 psig
(0.2-3 barg) range switch, with 1/4” NPTE pressure connections,
is an alternative to the paddle-type flow switch.
(Field mounted)
REFRIGERANT ISOLATION VALVES - For standard water
chiller applications, optional factory-installed isolation
valves in the compressor discharge line and refrigerant
liquid line per circuit are available. This allows isolation and
storage of the refrigerant charge in the chiller condenser
during servicing, eliminating time-consuming transfers to
remote storage vessels. Both valves in each of the independent
refrigerant circuits are positive shut-off, assuring
integrity of the storage system.
DUAL PRESSURE RELIEF VALVE – For ASME shells,
two safety relief valves are mounted in parallel; one is
always operational to assist in valve replacement during
maintenance.
PRESSURE VESSEL OPTIONS – The evaporator and
condenser can be provided with either ASME or PED
pressure vessel codes certification.
CIRCUIT BREAKER – A unit-mounted circuit breaker
with external lockable handle will be supplied to isolate
the single point power voltage for servicing. The circuit
breaker is sized to provide motor branch circuit protection,
short circuit protection and ground fault protection
for the motor branch-circuit conductors, the motor control
apparatus and the motors.
SPECIAL REQUIREMENT DOCUMENTS – There are
two options to select from:
• Special Requirement Document Package (SRDP)
includes Pressure Vessel Report, Unit Run Test Report,
Production System Check Sheet and Final Unit
Inspection Check Sheet.
• Factory Witness Run Test includes customer witness
of chiller end-of-line run test in addition to the SRDP.
• Materials Package includes steel mill material reports
for vessels in addition to the SRDP.
VIBRATION ISOLATION
ELASTOMERIC ISOLATION – This option is recommended
for normal installations. It provides very good
performance in most applications for the least cost. Field
mounted.
1” SPRING ISOLATORS – Spring and cage type isolators
for mounting under the unit base rails are available to support
unit. They are level adjustable. 1” nominal deflection
may vary slightly by application. (Field mounted)

 

 

Qinhao Zhan

HVAC&R Engineer

Refrigeration and Process Systems

China Refrigeration (York by Johnson Controls)

Mobile:+86 13818154378  18625150627

QQ:    826554493

862417098

 

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