York YMC2 User manual

FORM 160.84-EG1 (617)
MODEL YMC2
MAGNETIC BEARING CENTRIFUGAL LIQUID CHILLERS
165-1000 Tons
580-3520 kW
50 & 60 Hz
HFC-134a
or HFC-513A

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2
Nomenclature
VESSEL NOMENCLATURE
Inlet from Front View
R = Right
L = Left
Waterbox Type
S = Compact
T = Marine
Water Side Pressure Code
1 = 150 psi
3 = 300 psi
Water Connection Type
F = Flanges
G = Grooved Standard
A = Victaulic AGS
Number of Passes
Vessel
E = Evaporator
C = Condenser
Vessel Refrigerant Pressure Code
R = 180 psi
S = 235 psi
T = 300 psi
U = 350 psi
V = 400 psi
Tube Code
B = 3/4" Code 1
C = 3/4" Code 2
D = 3/4" Code 3
E = 3/4" Code 4
2 = 1" Code 1
3 = 1" Code 2
4 = 1" Code 3
5 = 1" Code 4
Heat Exchanger Mod Level
Nominal Inside Diameter (Inches)
Nominal Length (Feet)
Marketing Tube Number
E A 25 14 271 B R 1 1 F C R
COMPRESSOR NOMENCLATURE
Gas Path Revision Level
Impeller Design Revision Level
Motor
Motor Design Level
Impeller Tip Diameter
(mm)
Rotation
F = Forward
R = Reverse
M2 B - 197 F A A
SYSTEM NOMENCLATURE
YORK
Centrifugal Chiller
Magnetic Bearing
Mod Level
S = Single Stage
T = Two Stage
Capacity in KW
A = Refrigerant R-134a
B = Refrigerant R-513A
Y M C 2 - S 0756 A B
Liquid DWP
15 = 150 psi
30 = 300 psi
40 = 380V 60Hz
50 = 400V 50Hz
46 = 460V 60Hz
68 = 415V 50Hz
D = Disconnect Switch
B = Circuit Breaker
X = Factory Installed
R = Field Installed
VARIABLE SPEED DRIVE NOMENCLATURE
Model
H = YMC2Chiller
Amps
HYP 774 X H 15 D - 40

FORM 160.84-EG1 (617)
JOHNSON CONTROLS 3
Table Of Contents
INTRODUCTION...................................................................................................................................................... 5
RATINGS.................................................................................................................................................................. 8
UNIT COMPONENTS ............................................................................................................................................ 10
EQUIPMENT OVERVIEW...................................................................................................................................... 12
OPTIVIEW CONTROL CENTER ........................................................................................................................... 17
OPTISPEED VARIABLE-SPEED DRIVE .............................................................................................................. 24
ACCESSORIES AND MODIFICATIONS ............................................................................................................... 26
APPLICATION DATA ............................................................................................................................................. 27
UNIT DIMENSIONS ............................................................................................................................................... 38
WEIGHTS............................................................................................................................................................... 56
GUIDE SPECIFICATIONS ..................................................................................................................................... 63
METRIC (SI) CONVERSION.................................................................................................................................. 68
Images contained in this document may represent the standard product with available options.

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THIS PAGE INTENTIONALLY LEFT BLANK.

FORM 160.84-EG1 (617)
JOHNSON CONTROLS 5
The YORK®YMC² chiller offers a full package of features for total owner satisfaction. Key
benefits include efficiency, sustainability, quiet operation, and reliability.
EFFICIENCY
Actual chiller efficiency cannot be determined by analyzing the theoretical efficiency of
any one chiller component. It requires a specific combination of heat exchanger, com-
pressor, and motor performance to achieve the lowest system kW/ton. YMC² technology
matches chiller system components to provide maximum chiller efficiency under actual –
not just theoretical – operating conditions. The YMC² chiller lowers energy costs with up to
10% better efficiency than existing designs at both full and part-load conditions.
Johnson Controls pioneered the term “Real-World Energy” to illustrate the energy-saving
potential of focusing on chiller performance during off-design conditions. Off-design condi-
tions are not only seen at part-load, but at full-load operation as well, by taking advantage
of reduced entering condenser water temperatures (ECWTs). This is where chillers oper-
ate 99% of the time, and where operating costs add up. YMC² chillers are the only chillers
designed to operate on a continuous basis with cold ECWT and full condenser flow at all
load points, taking full advantage of Real-World conditions. This type of operation benefits
the cooling tower as well by reducing cycling of the fan motor and ensuring good coverage
of the cooling tower fill. YMC² chillers offer the most efficient Real-World operation of any
chiller, meaning lower operating costs and an excellent return on your chiller investment.
YORK single-stage compressors are designed to reduce energy costs. High strength alu-
minum-alloy compressor impellers feature backward-curved vanes for high efficiency. Dy-
namically-controlled mechanical flow regulation with motor speed allows the compressor
to unload smoothly from maximum to minimum load for excellent part-load performance
in air conditioning applications.
The YMC² chiller's heat exchangers offer the latest technology such as falling-film, in
addition to the latest technology in heat transfer surface design to give you maximum ef-
ficiency, reduced refrigerant charge, and a compact design. The largest unit has only a 14’
(4.3m) heat exchanger length.
The YORK OptiView™ Control Center, furnished as standard on each chiller, provides the
ultimate in efficiency, monitoring, data recording, chiller protection and operating ease.
The OptiView Control Center is a factory-mounted, wired and tested state-of-the-art mi-
croprocessor-based control system for HFC-134a or HFC-513A centrifugal chillers.
Setpoints can be changed from a remote location via 0-10VDC, 4-20mA, contact clo-
sures or through serial communications. The adjustable remote reset range [up to 20°F
(11.1°C)] provides flexible, efficient use of remote signal depending on reset needs. The
serial data interface to the Building Automation System (BAS) is through the optional fac-
tory mounted E-Link installed inside the Control Center.
Introduction
Off-design is not
only part load, but
full load operation
as well, with reduced
entering condenser
water temperatures
(ECWTs)

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6
SUSTAINABILITY
Ninety-eight percent of the global-warming potential (GWP) of a centrifugal chiller is from
the indirect effect – or the greenhouse gases generated in the production of electricity to
run the chiller. Two percent of the GWP is from the direct effect or release of the refrigerant
gases into the atmosphere.
To address the direct effect, the YMC² chiller first reduces the chances for refrigerant leaks
by dramatically reducing the number of connections, down 57% compared to traditional
chiller designs. Then we have employed falling-film evaporator technology that reduces
the overall refrigerant charge by up to 30% and improves the efficiency of the evapora-
tor. This can help qualify your project for up to 2 more LEED points using the advanced
refrigerant-management credit. Finally, by eliminating the lubrication system, the YMC²
chiller lets you avoid all the environmental issues of handling and disposing refrigerant
saturated oil. Add it all up and you will see why you can count on the YMC² chiller to yield
a positive environmental result.
The YMC² chiller employs the most environmentally friendly refrigerants available, HFC-
134a or HFC-513A with no Ozone Depletion Potential and no phase-out date per the
Montreal Protocol.
Utilizing HFC-134a or HFC-513A will achieve better results than the soon-to-be phased-
out HCFC-123 when using the US Green Building Council's (USGBC) Template EAc4
(Enhanced Refrigerant Management) to calculate the refrigerant impact of your project.
The heat exchangers utilized on the YMC² chiller introduce a proprietary falling-film evap-
orator design that helps not only operate more efficiently, but also allows us to reduce our
refrigerant charges up to 30% beyond conventional chiller designs.
To ensure maximum efficiency, the YMC² chiller utilizes a hermetically sealed, permanent-
magnet motor. The compressor is directly driven by the motor, eliminating any losses from
using gears for power transmission. Active magnetic bearings are used to support the mo-
tor shaft allowing this chiller series to be completely OIL FREE, with no oil management
system required.
OPTISOUND™ CONTROL
YMC² chillers are equipped with the YORK OptiSound Control as standard. OptiSound
Control is a patented combination of centrifugal-chiller hardware and software that re-
duces operational sound levels, expands the chiller operating range, and improves chiller
performance. The OptiSound Control continuously monitors the characteristics of the
compressor-discharge gas and optimizes the diffuser spacing to minimize gas-flow dis-
ruptions from the impeller. It can also reduce part-load sound levels below the full-load
level.
We utilize a permanent-magnet motor and active magnetic-bearing technology to elimi-
nate driveline sound.
Introduction (Cont'd)
The OptiSound Control
continuously monitors
the characteristics of
the compressor
discharge gas

FORM 160.84-EG1 (617)
JOHNSON CONTROLS 7
RELIABILITY
Designed for the most reliable chillers we have ever made, the YMC² YORK Magnetic
Bearing Compressor will achieve a much better performance because it is based on a
successful line of efficient YORK single-stage compressors. With fewer moving parts and
straightforward design, YORK single-stage compressors have proven durability in numer-
ous applications, especially applications where minimal downtime is a critical concern.
The YMC² chiller is driven by a Johnson Controls OptiSpeed™ variable-speed drive
(VSD) to ensure optimal Real-World performance especially at part-load conditions. First,
the OptiSpeed is designed with a standard, factory-packaged, active front end to ensure
the % current Total Demand Distortion (TDD) is kept below 5% and that a chiller displace-
ment power factor of at least 0.97 is maintained in order to help your building comply with
the guidelines of IEEE-519. Second, to ensure equipment safety and longevity, this chiller
is equipped with the option of either a circuit breaker or a disconnect switch. Third, volt-
age options of 380V and 460V (60Hz), 400V and 415V (50Hz) are available to serve our
global customers.
YMC² chillers are designed to keep installation costs low. Where installation access is
not a problem, the unit can be shipped completely packaged including the unit-mounted
OptiSpeed VSD, requiring minimal piping and wiring to complete the installation.
The majority of chiller components on the YMC² chillers have been time tested on the
tens of thousands of YK chillers operating globally. The YMC² chiller employs the most
advanced drive available - an active magnetic-bearing drive - to levitate the driveshaft.
The result is frictionless operation and fewer moving parts subject to breakdown, which is
why we have used this magnetic drive in our mission-critical chillers since 1998.
The YMC² chiller incorporates service design principles that are consistent with our Model
YK Centrifugal Chillers. We made sure that this chiller, and specifically the driveline, was
field serviceable by a single source supplier, who also happens to be the industry’s largest
service force.
Introduction (Cont'd)

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FORM 160.84-EG1 (617)
8
Ratings
AHRI CERTIFICATION PROGRAM
YORK YK chillers have been tested and certified by Air-Conditioning, Heating and
Refrigeration Institute (AHRI) in accordance with the latest edition of AHRI Standard
550/590 (I-P). Under this Certification Program, chillers are regularly tested in strict
compliance with this Standard. This provides an independent, third-party verification
of chiller performance. Refer to the AHRI site at: http://www.ahrinet.org/water_
chilling+packages+using+vap or+compression+cycle+_water_cooled_.aspx for complete
Program Scope, Inclusions, and Exclusions as some options listed herein fall outside the
scope of the AHRI certification program. For verification of certification, go to the AHRI
Directory at www.ahridirectory.org.
COMPUTERIZED PERFORMANCE RATINGS
Each chiller is custom-matched to meet the individual building load and energy require-
ments. A variety of standard heat exchangers and pass arrangements are available to
provide the best possible match. Computerized ratings are available through each John-
son Controls sales office. Each rating can be tailored to a specific job requirement, and is
part of the AHRI Certification Program.
Additionally, computerized ratings are able to provide detailed hourly weather used to
analyze chiller performance for each possible combination. The JCI rating software will
incorporate installation location weather data and user defined utility rates to approximate
the total Annual Energy Cost (AEC) to provide an in depth analysis of energy consumption
when comparing chiller efficiencies.
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 ef-
ficiently at lower loads and lower tower water temperatures. It is not uncommon for chillers
with the same full load efficiency to have an operating cost difference of over 10% due to
differences in off-design (part-load) efficiencies.
TAKE ADVANTAGE OF COLDER COOLING TOWER WATER TEMPERATURES
The YMC² chillers have been designed to take full advantage of colder cooling tower
water temperatures, which are naturally available during most operating hours. Consider-
able energy savings are available by letting tower water temperature drop, rather than
artificially holding it above 75°F (24°C), especially at low load, as some chillers require.

FORM 160.84-EG1 (617)
JOHNSON CONTROLS 9
Ratings (Cont'd)
The chiller is engineered for maximum efficiency at both design and part-load operation by taking
advantage of the colder cooling tower water temperatures which naturally occur during the winter
months. Appreciable power savings are realized from these reduced heads.
The minimum entering condenser water temperature for other full and part-load conditions is provided
by the following equation:
where:
ECWT = entering condensing water temperature
LCHWT = leaving chilled water temperature
At initial startup, entering condensing water temperature may be as much as 30°F (16.66°C) colder
than the standby chilled water temperature.
Min ECWT = LCHWT -30°F (16.66°C)
LD22432
Part-load information can be easily and accurately generated by a computer. And because it is so im-
portant to an owner’s operating budget, this information has now been standardized within the AHRI
Certification Program in the form of an Integrated Partload Value (IPLV), and Non-Standard Partload
Value (NPLV).
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.

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FORM 160.84-EG1 (617)
10
Unit Components
1
2
3
4
5
6
7
8
9
10
COMPONENT DESCRIPTION
1 OptiView Control Panel
2 Keypad
3 Suction
4 Hot Gas Bypass (Optional)
5 Refrigerant Relief Valves
6 Endsheet
7 Condenser
8 Sight Glass
9 Lockout Handle
10 VSD
LD18605

FORM 160.84-EG1 (617)
JOHNSON CONTROLS 11
Unit Components (Cont'd)
COMPONENT DESCRIPTION
1 VSD
2 VSD Coolant Reservoir
3 Nozzles
4 Compact Waterbox
5 Power Panel
6 Evaporator
7 Suction
8Direct Dive Compressor Motor
with Active Magnetic Bearings
12
3
4
5
6
7
8
LD18606

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FORM 160.84-EG1 (617)
12
Equipment Overview
YORK YMC² Centrifugal Liquid Chillers are completely factory-packaged including the
evaporator, condenser, compressor, motor, VSD, control center, and all interconnecting
unit piping and wiring.
The initial charge of refrigerant is supplied for each chiller. Actual shipping procedures for
the chiller will depend on a number of project-specific details.
The services of a Johnson Controls factory-trained, field service representative are in-
curred to supervise or perform the final leak testing, charging, the initial start-up, and
concurrent operator instructions.
COMPRESSOR
The compressor is a single-stage centrifugal type directly driven by a hermetically-sealed,
permanent-magnet motor. A cast-aluminum, fully-shrouded impeller is mounted directly
to the motor shaft using a stretched tie-bolt. Impeller seals employ a labyrinth geometry,
sized to provide minimal thrust loading on the impeller throughout the operating range.
The impeller is dynamically balanced and overspeed tested for smooth, vibration-free
operation.
CAPACITY CONTROL
Capacity control will be achieved by the combined use of variable speed control and
mechanical flow regulation to provide fully modulating control from maximum to minimum
load. For normal air conditioning applications, the chiller can adjust capacity from 100%
to 15% of design. For each condition the capacity control devices will be automatically
adjusted to maintain a constant leaving chilled liquid temperature at optimized efficiency,
based on information fed by sensors located throughout the chiller.
All mechanical actuators are external electrical devices which automatically and precisely
position components.
MOTOR
The compressor motor is a hermetically-sealed, high-speed design with a permanent
magnet rotor supported by active magnetic bearings. Each magnetic bearing cartridge
includes both radial and axial (thrust) bearings. The bearing controls provide a completely
oil-free operating system. The motor rotor and stator are cooled by a pressure driven re-
frigerant loop to maintain acceptable operating temperatures.
The active magnetic bearings are equipped with automatic vibration reduction and bal-
ancing systems to ensure smooth and reliable operation. In the event of a power failure,
the magnetic bearings will remain in operation throughout the compressor coast-down us-
ing a reserve energy supply. Mechanical bearings are included as backup to the magnetic
bearings and designed for emergency touchdown situations.
The active magnetic
bearings are equipped
with automatic
vibration reduc-
tion and balancing
systems

FORM 160.84-EG1 (617)
JOHNSON CONTROLS 13
Equipment Overview (Cont'd)
OPTISOUND CONTROL
YMC² chillers are equipped with the YORK OptiSound Control as standard. The YORK
OptiSound Control is a patented combination of centrifugal-chiller hardware and software
that reduces operational sound levels, expands the chiller operating range, and improves
chiller performance. The OptiSound Control feature continuously monitors the charac-
teristics of the compressor-discharge gas and optimizes the diffuser spacing to minimize
gas-flow disruptions from the impeller. This innovative technology improves operating
sound levels of the chiller and can reduce part-load sound levels below the full-load level.
In addition, the OptiSound Control provides the benefit of an expanded operating range.
It improves performance and reliability by minimizing diffuser-gas stall at off-design op-
eration, particularly at conditions of very low load combined with little or no condenser-
water relief. The elimination of the gas-stall condition can also result in improved chiller
efficiency at off design conditions.
OptiSpeed VSD
A VSD is factory-packaged and mounted on the YMC² chiller. It is designed to vary the
compressor motor speed by controlling the frequency and voltage of the electrical power
to the motor. The capacity control logic shall automatically adjust motor speed and com-
pressor diffuser geometry for maximum part-load efficiency by analyzing information fed
to it by sensors located throughout the chiller. See OptiView Control Center on page 17
for additional information.
HEAT EXCHANGERS
Shells
Evaporator and condenser shells are fabricated from rolled carbon steel plates with fu-
sion welded seams or carbon steel pipe. Carbon steel tube sheets, drilled and reamed to
accommodate the tubes, are welded to the end of each shell. Intermediate tube supports
are fabricated from carbon steel plates, drilled and reamed to eliminate sharp edges. The
refrigerant side of each shell is designed, tested, and stamped in accordance with ASME
Boiler and Pressure Vessel Code, Section VIII – Division I, or other pressure vessel code
as appropriate.
Tubes
Heat exchanger tubes are copper alloy high-efficiency, externally and internally enhanced
type to provide optimum performance. Utilizing the “skip-fin” tube design provides a
smooth internal and external surface at each intermediate tube support. This provides
extra wall thickness (up to twice as thick) and non work-hardened copper at the support
location, extending the life of the heat exchangers. Each tube is roller-expanded into the
tube sheets providing a leak-proof seal, and is individually replaceable.
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 spray distributor provides
uniform distribution of refrigerant over the entire shell length to yield optimum heat trans-
fer. A suction baffle is located above the tube bundle to prevent liquid refrigerant carryover

JOHNSON CONTROLS
FORM 160.84-EG1 (617)
14
into the compressor. A 1-1/2" (38 mm) liquid level sight glass is conveniently located on
the side of the shell to aid in determining proper refrigerant charge. The evaporator shell
contains a dual refrigerant relief valve arrangement or a single-relief valve arrangement, if
the chiller is supplied with the optional refrigerant isolation valves. A 1" (25.4 mm) refriger-
ant charging valve is provided for service access.
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. A 1-1/2" (38 mm) liquid level sight glass is conve-
niently located on the side of the shell to aid in determining proper refrigerant charge. The
condenser contains dual refrigerant relief valves.
Water Boxes
The removable water boxes are fabricated of steel. Integral steel water baffles are located
and welded within the water box to provide the required pass arrangements. Stub-out
water nozzle connections welded to the water boxes are suitable for ANSI/AWWA C-606
couplings, welding or flanged, and are capped for protection during shipment. Plugged
3/4" (19 mm) drain and vent connections are provided in each water box.
REFRIGERANT ISOLATION VALVES
Factory-installed isolation valves in the compressor discharge line and refrigerant liquid
line allow isolation and storage of the refrigerant charge in the chiller condenser.
WATER FLOW SWITCHES
Thermal type water flow switches are factory mounted in the chilled and condenser water
nozzles, and are factory wired to the OptiView control panel. These solid state flow sen-
sors have a small internal heating element. They use the cooling effect of the flowing fluid
to sense when an adequate flow rate has been established. The sealed sensor probe is
316 stainless steel, which is suited to very high working pressures.
REFRIGERANT FLOW CONTROL
Refrigerant flow to the evaporator is controlled by the YORK variable orifice control sys-
tem. Liquid refrigerant level is continuously monitored to provide optimum subcooler,
condenser and evaporator performance. The variable orifice electronically adjusts to all
Real-World operating conditions, providing the most efficient and reliable operation of
refrigerant flow control.
OPTIVIEW CONTROL CENTER
The chiller is controlled by a stand-alone, microprocessor-based control center. The con-
trol center provides control of chiller operation and monitoring of chiller sensors, actua-
tors, relays and switches. See OptiView Control Center on page 17 for additional infor-
mation.
Equipment Overview (Cont'd)

FORM 160.84-EG1 (617)
JOHNSON CONTROLS 15
Equipment Overview (Cont'd)
CODES AND STANDARDS
• ASME Boiler and Pressure Vessel Code – Section Vlll Division 1.
• AHRI Standard 550/590
• c/U.L. – Underwriters Laboratory
• ASHRAE 15 – Safety Code for Mechanical Refrigeration
• ASHRAE Guideline 3 – Reducing Emission of Halogenated Refrigerants in Refrig-
eration and Air-Conditioning Equipment and Systems
• N.E.C. – National Electrical Code
• OSHA – Occupational Safety and Health Act
• IEEE Std. 519-1992 Compliance
ISOLATION MOUNTING
The unit is provided with four vibration isolation mounts of nominal 1" operating height.
The pads have a neoprene pad to contact the foundation, bonded to a steel plate. The
vibration isolation pad assemblies mount under steel plates welded to the chiller tube
sheets.
REFRIGERANT CONTAINMENT
The standard unit has been designed as a complete and compact factory-packaged chill-
er. As such, it has minimum joints from which refrigerant can leak. The entire assembly
has been thoroughly leak tested at the factory prior to shipment. The YMC² chiller includes
service valves conveniently located to facilitate transfer of refrigerant to a remote refriger-
ant storage/recycling system. Condenser isolation valves allow storage of the charge in
the condenser.
PAINT
Exterior surfaces are protected with one coat of Caribbean blue, durable alkyd-modified,
vinyl enamel, machinery paint.
SHIPMENT
Protective covering is furnished on the Control Center, VSD, and unit-mounted controls.
Water nozzles are capped with fitted plastic enclosures. Entire unit is protected with in-
dustrial-grade, reinforced shrinkwrap covering. Each unit can be broken down into several
form shipment configurations for ease of transportation and installation.
FORM 3 – Driveline Separate from Shells
Shipped as three major assemblies:
• Driveline (motor/compressor assembly)
• Evaporator/Condenser shell assembly
• Variable Speed Drive

JOHNSON CONTROLS
FORM 160.84-EG1 (617)
16
The unit is first factory assembled, refrigerant piped, wired and leak tested; then disman-
tled for shipment. Close-coupled compressor/hermetic motor assembly removed from
shells and skidded. Evaporator/condenser is not skidded.
FORM 7 – Driveline Separate from Split Shells
Shipped as four major assemblies:
• Driveline (motor/compressor assembly)
• Evaporator
• Condenser
• Variable Speed Drive
The unit is first factory assembled, refrigerant piped, wired and leak tested; then disman-
tled for shipment. Close-coupled compressor/hermetic motor assembly removed from
shells and skidded.
FORM 9 – Unit Separate from Variable Speed Drive (Refrigerant Shipped Separate)
Shipped as two major assemblies:
• Chiller Unit
• Variable Speed Drive
The unit is first factory assembled, refrigerant piped, wired and leak tested; then disman-
tled for shipment. Evaporator/condenser is not skidded.
FORM 10 – Unit Separate from Variable Speed Drive (Unit Charged with
Refrigerant)
Shipped as two major assemblies:
• Chiller Unit
• Variable Speed Drive
The unit is first factory assembled, refrigerant piped, wired and leak tested; then disman-
tled for shipment. Evaporator/condenser is not skidded.
FORM 11 – Split Shells
Shipped as two major assemblies:
• Condenser side assembly (Condenser/OptiView/Variable Speed Drive)
• Evaporator side assembly (Evaporator/Driveline/Magnetic Bearing Controller)
The unit is first factory assembled, refrigerant piped, wired and leak tested; then disman-
tled for shipment. Evaporator/condenser is not skidded.
Equipment Overview (Cont'd)

FORM 160.84-EG1 (617)
JOHNSON CONTROLS 17
OptiView Control Center
NOTE: Please refer to the OptiView Control Center Operator's Manual for a complete
description of features and functionality.
The YORK OptiView Control Center is a factory mounted, wired and tested microproces-
sor based control system for HFC-134a centrifugal chillers. For the YMC², it controls the
leaving chilled liquid temperature and limits the motor current via control of the Variable
Geometry Diffuser (VGD) and Variable Speed Drive (VSD).
LD18607
The panel comes configured with a full screen LCD Graphic Display mounted in the mid-
dle of a keypad interface with soft keys, which are redefined with one keystroke based on
the screen displayed at the time. The graphic display allows the presentation of several
operating parameters at once. In addition, the operator may view a graphical represen-
tation of the historical operation of the chiller as well as the present operation. For the
novice user, the locations of various chiller parameters are clearly and intuitively marked.
Instructions for specific operations are provided on many of the screens. To prevent unau-
thorized changes of set points and operating conditions, security access is provided with
three different levels of access and passwords.
The graphic display also allows information to be represented in both English (tempera-
tures in °F and pressures in PSIG) and Metric (temperatures in °C and pressures in kPa)
mode. The advantages are most apparent, however, in the ability to display many lan-
guages.
The Control Center continually monitors the system operation and records the cause of
any shutdowns (Safety, Cycling or Normal). This information is recorded in memory and
is preserved even through a power failure condition. The user may recall it for viewing at
any time. During operation, the user is continually advised of the operating conditions by
various status and warning messages. In addition, it may be configured to notify the user
of certain conditions via alarms. The Control Center expands the capabilities of remote
control and communications. By providing a common networking protocol through the
Building Automation System (BAS), YORK Chillers not only work well individually, but

JOHNSON CONTROLS
FORM 160.84-EG1 (617)
18
also as a team. This new protocol allows increased remote control of the chiller, as well as
24-hour performance monitoring via a remote site. In addition, compatibility is maintained
with the present network of BAS communications. The chiller also maintains the standard
digital remote capabilities as well. Both of these remote control capabilities allow for the
standard Energy Management System (EMS) interface:
1. Remote Start
2. Remote Stop
3. Remote Leaving Chilled Liquid Temperature Setpoint adjustment (0 to 10VDC, 2 to
10VDC, 0 to 20mA or 4 to 20mA) or Pulse Width Modulation
4. Remote Current Limit Setpoint adjustment
5. (0 to 10VDC, 2 to 10VDC, 0 to 20mA or 4 to 20mA) or Pulse Width Modulation
6. Remote READY TO START Contacts
7. Safety Shutdown Contacts
8. Cycling Shutdown Contacts
The following are examples of the information displayed on some of the more important
screens:
SYSTEM SCREEN
This screen gives a general overview of common chiller parameters.
LD18608
OptiView Control Center (Cont'd)

FORM 160.84-EG1 (617)
JOHNSON CONTROLS 19
EVAPORATOR SCREEN
This screen displays a cutaway view of the chiller evaporator. All setpoints relating to the
evaporator side of the chiller are maintained on this screen. Animation of the evaporation
process indicates whether the chiller is presently in a RUN condition (bubbling) and liquid
flow in the pipes is indicated by alternating shades of color moving in and out of the pipes.
LD18609
CONDENSER SCREEN
This screen displays a cutaway view of the chiller condenser. All setpoints relating to the
condenser side of the chiller are maintained on this screen. Animation indicates con-
denser liquid flow.
LD18610
OptiView Control Center (Cont'd)

JOHNSON CONTROLS
FORM 160.84-EG1 (617)
20
COMPRESSOR SCREEN
This screen displays a cutaway view of the chiller compressor, revealing the impeller, and
shows all conditions associated with the compressor. Animation of the compressor impel-
ler indicates whether the chiller is presently in a RUN condition. This screen also serves
as a gateway to subscreens for the Magnetic Bearing Controller (MBC), the Variable Ge-
ometry Diffuser (VGD), and the Power Panel.
LD18611
MAGNETIC BEARING CONTROLLER
This screen can be accessed from the COMPRESSOR Screen and gives a general over-
view of the motor controls.
LD18612
OptiView Control Center (Cont'd)