York YT Millennium Manual

OPERATING & MAINTENANCE
MILLENNIUM ®
CENTRIFUGAL LIQUID CHILLERS
Supersedes: 160.55-O1 (604) Form 160.55-O1 (920)
MODEL YT (STYLE J)
R-123 COOLING ONLY
WITH OPTIVIEW™CONTROL CENTER
FOR ELECTRO-MECHANICAL STARTER,
SOLID STATE STARTER and VARIABLE SPEED DRIVE
29509A
Issue Date:
September 18, 2020

YORK INTERNATIONAL
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FORM 160.55-O1 (920)
This equipment is a relatively complicated apparatus.
During rigging, installation, operation, maintenance,
or service, individuals may be exposed to certain com-
ponents or conditions including, but not limited to:
heavy objects, refrigerants, 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 responsibility of rigging, instal-
lation, and 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
IMPORTANT!
READ BEFORE PROCEEDING!
GENERAL SAFETY GUIDELINES
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
rigging, installation, and operating/service personnel. It
is expected that these individuals possess 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 the on-product labels,
this document and any referenced materials. This in-
dividual shall also be familiar with and comply with
all applicable industry and governmental standards and
regulations pertaining to the task in question.
SAFETY SYMBOLS
The following symbols are used in this document to alert the reader to specific situations:
Indicates a possible hazardous situation
which will result in death or serious injury
if proper care is not taken.
Indicates a potentially hazardous situa-
tion which will result in possible injuries
or damage to equipment if proper care is
not taken.
Identifies a hazard which could lead
to damage to the machine, damage to
other equipment and/or environmental
pollution if proper care is not taken or
instructions and are not followed.
Highlights additional information useful
to the technician in completing the work
being performed properly.
External wiring, unless specied as an optional connection in the manufacturer’s product line, is not
to be connected inside the control cabinet. Devices such as relays, switches, transducers and controls
and any external wiring must not be installed inside the micro panel. All wiring must be in accor-
dance with Johnson Controls’ published specications and must be performed only by a qualied
electrician. Johnson Controls will NOT be responsible for damage/problems resulting from improper
connections to the controls or application of improper control signals. Failure to follow this warning
will void the manufacturer’s warranty and cause serious damage to property or personal injury.

FORM 160.55-O1 (920)
3
YORK INTERNATIONAL
CHANGEABILITY OF THIS DOCUMENT
In complying with Johnson Controls’ policy for contin-
uous product improvement, the information contained
in this document is subject to change without notice.
Johnson Controls makes no commitment to update
or provide current information automatically to the
manual or product owner. Updated manuals, if appli-
cable, can be obtained by contacting the nearest John-
son Controls Service office or accessing the Johnson
Controls Knowledge Exchange website at https://docs.
johnsoncontrols.com/chillers/.
It is the responsibility of rigging, lifting, and operating/
service personnel to verify the applicability of these
documents to the equipment. If there is any question
regarding the applicability of these documents, rig-
ging, lifting, and operating/service personnel should
verify whether the equipment has been modified and
if current literature is available from the owner of the
equipment prior to performing any work on the chiller.
ASSOCIATED LITERATURE
MANUAL DESCRIPTION FORM NUMBER
SOLID STATE STARTER (MOD “A”) – OPERATION & MAINTENANCE 160.46-OM3.1
SOLID STATE STARTER (MOD “B”) – OPERATION & MAINTENANCE 160.00-O2
VARIABLE SPEED DRIVE – OPERATION 160.00-O1
INSTALLATION 160.55-N1
WIRING DIAGRAM – UNIT WITH ELECTRO-MECHANICAL STARTER 160.55-PW1
WIRING DIAGRAM – UNIT WITH SOLID STATE STARTER (MOD “B”) 160.55-PW2
WIRING DIAGRAM – UNIT WITH VARIABLE SPEED DRIVE 160.55-PW3
RENEWAL PARTS – UNIT 160.48-RP5
RENEWAL PARTS – GRAPHIC CONTROL CENTER 160.55-RP1
AFFECTED PAGES DESCRIPTION
3 Associated Literature table updated
3 Conditioned Based Maintenance program information added
REVISION NOTES
Revisions made to this document are indicated in the following table. These revisions are to technical information,
and any other changes in spelling, grammar, or formatting are not included.
CONDITIONED BASED MAINTENANCE
Traditional chiller maintenance is based upon assumed
and generalized conditions. In lieu of the tradition-
al maintenance program, a Johnson Controls YORK
Conditioned Based Maintenance (CBM) program can
be substituted. This CBM service plan is built around
the specific needs for the chiller, operating conditions,
and annualized impact realized by the chiller. Your lo-
cal Johnson Controls Branch can propose a customized
Planned Service Agreement that leverages real time
and historical data, delivering performance reporting,
corrective actions required and data enabled guidance
for optimal operation and lifecycle assurance. The pro-
gram will include fault detection diagnostics, operation
code statistics, performance based algorithms and ad-
vance rules based rationale delivered by the Johnson
Controls Connected Equipment Portal.

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FORM 160.55-O1 (920)
NOMENCLATURE
The model number denotes the following characteristics of the unit
YT K3 C4 E2 — CR J
Model Design Level
Cooler Code Motor Code
Condenser Code Power Supply
— for 60 Hz
Compressor Code 5 for 50 Hz

FORM 160.55-O1 (920)
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YORK INTERNATIONAL
SECTION 1 Description of System and Fundamentals of Operation............................... 7
SECTION 2OptiView Control Center ............................................................................. 9
SECTION 3Printers ..................................................................................................... 112
SECTION 4System Operating Procedures .................................................................. 124
SECTION 5System Components Description ............................................................. 131
SECTION 6Operational Maintenance ......................................................................... 135
SECTION 7Troubleshooting........................................................................................ 138
SECTION 8Maintenance ............................................................................................. 144
SECTION 9Preventive Maintenance ........................................................................... 152
SECTION 10 OptiSave Energy Analyser Feature .......................................................... 154
TABLE OF CONTENTS

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FORM 160.55-O1 (920)
LIST OF FIGURES
FIG. 1 – MODEL YT MILLENNIUM CHILLER ................. 7
FIG. 2 – REFRIGERANT FLOW-THROUGH CHILLER . 8
DETAIL A – COMPRESSOR PREROTATION
VANES ................................................................. 8
FIG. 3 – CONTROL CENTER......................................... 12
FIG. 4 – HOME SCREEN................................................ 16
FIG. 5 – SYSTEM SCREEN ........................................... 18
FIG. 6 – EVAPORATOR SCREEN ................................. 20
FIG. 7 – CONDENSER SCREEN................................... 22
FIG. 8 – PURGE SCREEN ............................................. 24
FIG. 9 – REFRIGERANT LEVEL CONTROL SCREEN 26
FIG. 10 – COMPRESSOR SCREEN................................ 28
FIG. 11 – HOT GAS BYPASS SCREEN .......................... 30
FIG. 12 – SURGE PROTECTION SCREEN.................... 32
FIG. 13 – PRE-ROTATION VANES CALIBRATION
SCREEN............................................................ 36
FIG. 14 – VSD TUNING SCREEN.................................... 38
FIG. 15 – OIL SUMP SCREEN......................................... 40
FIG. 16 – ELECTRO-MECHANICAL STARTER SCREEN41
FIG. 17 – SOLID STATE STARTER
(MOD A) SCREEN ............................................ 42
FIG. 18 – SOLID STATE STARTER
(MOD B) SCREEN ............................................ 44
FIG. 19 – VARIABLE SPEED DRIVE SCREEN .............. 46
FIG. 20 – VARIABLE SPEED DRIVE DETAILS SCREEN
(All VSD except Part Number 371-02767-XXX
(60 Hz) or 371-03700-XXX (50 Hz)) ................... 48
FIG. 21 – .. VARIABLE SPEED DRIVE DETAILS SCREEN
(VSD with Part Number 371-02767-XXX
(60 Hz) or 371-03700-XXX (50 Hz)) ................... 50
FIG. 22 – ADAPTIVE CAPACITY CONTROL DETAILS
SCREEN............................................................ 52
FIG. 23 – HARMONIC FILTER DETAILS SCREEN
(All VSD except Part Number 371-02767-XXX
(60 Hz) or 371-03700-XXX (50 Hz)) ................... 54
FIG. 24 – HARMONIC FILTER DETAILS SCREEN
(VSD with Part Number 371-02767-XXX (60 Hz)
or 371-03700-XXX (50 Hz))................................ 56
FIG. 25 – SETPOINTS SCREEN ..................................... 58
FIG. 26 – SETUP SCREEN .............................................. 60
FIG. 27 – SCHEDULE SCREEN ...................................... 64
FIG. 28 – USER SCREEN ................................................ 66
FIG. 29 – COMMS SCREEN ............................................ 68
FIG. 30 – PRINTER SCREEN .......................................... 70
FIG. 31 – SALES ORDER SCREEN ................................ 72
FIG. 32 – OPERATIONS SCREEN .................................. 74
FIG. 33 – HISTORY SCREEN .......................................... 76
FIG. 34 – HISTORY DETAILS SCREEN.......................... 78
FIG. 35 – SECURITY LOG SCREEN............................... 79
FIG. 36 – SECURITY LOG DETAILS SCREEN .............. 80
FIG. 37 – TREND SCREEN.............................................. 82
FIG. 38 – TREND SETUP SCREEN ................................ 84
FIG. 39 – ADVANCED TREND SETUP SCREEN........... 86
FIG. 40 – COMMON SLOTS SCREEN............................ 88
FIG. 41 – CUSTOM VIEW SCREEN................................ 89
FIG. 42 – CUSTOM VIEW SETUP SCREEN .................. 90
FIG. 43 – PRINTERS .......................................................112
FIG. 44 – SAMPLE PRINTOUT (STATUS) .....................116
FIG. 45 – SAMPLE PRINTOUT (SETPOINTS) ..............110
FIG. 46 – SAMPLE PRINTOUT (SCHEDULE)...............119
FIG. 47 – SAMPLE PRINTOUT (SALES ORDER)........ 120
FIG. 48 – SAMPLE PRINTOUT (HISTORY).................. 121
FIG. 49 – SAMPLE PRINTOUT (SECURITY LOG) ...... 122
FIG. 50 – SAMPLE PRINTOUT (TREND)...................... 123
FIG. 51 – SAMPLE PRINTOUT
(CUSTOM SCREEN REPORT) ..................... 123
FIG. 52 – SAMPLE PRINTOUT
(ADAPTIVE CAPACITY CONTROL NEW MAP
POINT REPORT) ........................................... 123
FIG. 53 – SAMPLE PRINTOUT
(ADAPTIVE CAPACITY CONTROL EXISTING
MAP POINTS REPORT) ................................ 123
FIG. 54 – OPERATION SEQUENCE & TIMING
DIAGRAM (ELECTRO-MECHANICAL
& SOLID STATE STARTER APPLICATIONS)126
FIG. 55 – OPERATION SEQUENCE & TIMING
DIAGRAM (COMPRESSOR MOTOR
VARIABLE SPEED DRIVE APPLICATIONS) 126
FIG. 56 – MINIMUM ENTERING CONDENSING
WATER TEMPERATURE ............................... 127
FIG. 57 – LIQUID CHILLER LOG SHEETS................... 127
FIG. 58 – TURBOGUARD PURGE UNIT....................... 129
FIG. 59 – SCHEMATIC DRAWING (YT) COMPRESSOR
LUBRICATION SYSTEM................................ 132
FIG. 60 – OIL RETURN SYSTEM .................................. 135
FIG. 61 – ASSEMBLY OF DEHYDRATOR .................... 136
FIG. 62 – CHARGING OIL RESERVOIR WITH OIL ..... 137
FIG. 63 – EVACUATION OF CHILLER .......................... 145
FIG. 64 – SATURATION CURVE.................................... 147
FIG. 65 – DIAGRAM - MEGGING MOTOR WINDINGS 149
FIG. 66 – MOTOR STATOR TEMPERATURE &
INSULATION RESISTANCES........................ 150

FORM 160.55-O1 (920)
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combination Logic/Trigger Board that interfaces the
Control Center with a serial communications link. Ear-
lier vintage chillers, such as those encountered in Control
Center retrot applications are equipped with the Mod
“A” starter. This Starter contains a Trigger Board that
interfaces to a Logic Board that is installed inside of the
Control Center.
In operation, a liquid (water or brine to be chilled) ows
through the cooler, where boiling refrigerant absorbs heat
from the liquid. The chilled liquid is then piped to fan
coil units or other air conditioning terminal units, where
it ows through nned coils, absorbing heat from the
air. The warmed liquid is then returned to the chiller to
complete the chilled liquid circuit.
The refrigerant vapor, which is produced by the boiling
action in the cooler, ows to the compressor where the
rotating impeller increases its pressure and temperature
and discharges it into the condenser. Water owing
through the condenser tubes absorbs heat from the refrig-
erant vapor, causing it to condense. The condenser water
is supplied to the chiller from an external source, usually
a cooling tower. The condensed refrigerant drains from
the condenser into the liquid return line, where the vari-
SECTION 1
DESCRIPTION OF SYSTEM AND FUNDAMENTALS OF OPERATION
29509A
CONDENSER
CONTROL
CENTER
COMPRESSOR
MOTOR
COOLER
FIG. 1 – MODEL YT MILLENNIUM CHILLER
SYSTEM OPERATION DESCRIPTION (SEE FIG. 2)
The YORK Model YT Millennium Chiller is commonly
applied to large air conditioning systems, but may be
used on other applications. The chiller consists of an
open motor mounted to a compressor (with integral
speed increasing gears) condenser, cooler and variable
ow control.
The chiller is controlled by a modern state of the art
OptiView Control Center that monitors its operation. The
Control Center is programmed by the operator to suit job
specications. Automatic timed start-ups and shutdowns
are also programmable to suit nighttime, weekends and
holidays. The operating status, temperatures, pressures
and other information pertinent to operation of the chiller
are automatically displayed and read on a graphic mes-
sage display. Other displays can be observed by pressing
the keys as labeled on the Control Center. The chiller
with the OptiView Control Center is applied with an
electro-mechanical starter, YORK Solid State Starter
(optional) or Variable Speed Drive (optional).
There could be either of two dierent Solid State Start-
ers applied. New production chillers are equipped with
the Mod “B” Solid State Starter. This starter contains a
1
PURGE
UNIT

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FORM 160.55-O1 (920)
FIG. 2 – REFRIGERANT FLOW-THRU CHILLER
PREROTATION VANES
(See Detail A)
SUCTION
COOLER
ELIMINATOR
OIL COOLER
LD00924
FLOW CONTROL
ORIFICE
SUB-COOLER
CONDENSER
DISCHARGE
BAFFLE
DISCHARGE
COMPRESSOR
able orice meters the ow of liquid refrigerant to the
cooler to complete the refrigerant circuit.
The major components of a chiller are selected to handle
the refrigerant, which would be evaporated at full load
design conditions. However, most systems will be called
upon to deliver full load capacity for only a relatively
small part of the time the unit is in operation.
CAPACITY CONTROL
The major components of a chiller are selected for full
load capacities, therefore capacity must be controlled
to maintain a constant chilled liquid temperature leav-
ing the cooler. Prerotation vanes (PRV), located at the
entrance to the compressor impeller, compensate for
variation in load (See Fig. 2, Detail A).
The position of these vanes is automatically controlled
through a lever arm attached to an electric motor located
outside the compressor housing. The automatic adjust-
ment of the vane position in eect provides the perfor-
mance of many dierent compressors to match various
load conditions from full load with vanes wide open to
minimum load with vanes completely closed.
7619A(D)
DETAIL A – COMPRESSOR PREROTATION VANES
Description of System and Fundamentals of Operation

FORM 160.55-O1 (920)
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YORK INTERNATIONAL
SECTION 2
OPTIVIEW CONTROL CENTER
INTRODUCTION
The YORK OptiView Control Center is a micropro-
cessor based control system for R-11 or R123 centrifugal
chillers. It controls the leaving chilled liquid temperature
via pre-rotation vane controls and has the ability to limit
motor current via control of the pre-rotation vanes. It is
compatible with YORK Solid State Starter (optional),
Variable Speed Drive (optional) and Electro-Mechanical
starter applications.
The panel comes congured with a full screen LCD
Graphic Display mounted in the middle of a keypad
interface. The graphic display allows the presentation
of several operating parameters at once. In addition,
the operator may view a graphical representation 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 specic operations are provided on
many of the screens.
The graphic display also allows information to be repre-
sented in both English (temperatures in °F and pressures
in PSIA) and Metric (temperatures in °C and pressures in
kPa) mode. The advantages are most apparent, however,
in the ability to display many languages.
The Control Center continually monitors the system op-
eration 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 congured to notify the
user of certain conditions via alarms. A complete listing
of shutdown, status and warning messages is attached in
the Display Messages section of this book.
There are certain screens, displayed values, program-
mable Setpoints and manual control shown in this book
that are for Service Technician use only. They are only
displayed when logged in at SERVICE access level or
higher. These parameters aect chiller operation and
should NEVER be modied by anyone other than a
qualied Service Technician. They are shown in this
book for reference only.
Advanced Diagnostics and troubleshooting information
are also for Service Technicians only. Other chiller
features that are relevant for Service Technicians only
include the Refrigerant Level Control (Future), Purge
system, Hot Gas Bypass, Remote Setpoints, and Smart
Freeze Protection.
The control center expands the capabilities of remote
control and communications. By providing a common
networking protocol through the ISN GPIC YORK
Chillers not only work well individually, but 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 ISN commu-
nications. 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 (0-20mA or 4-20mA, 0-10VDC
or 2-10VDC) or Pulse Width Modulation
4. Remote Current Limit Setpoint adjustment (0-20mA
or 4-20mA, 0-10VDC or 2-10VDC) or Pulse Width
Modulation
5. Remote “Ready to Start” Contacts
6. Safety Shutdown Contacts
7. Cycling Shutdown Contacts
The chiller operating program resides in the Optiview
control center Microboard. The control center could be
equipped with either of the following Microboards:
• 031-01730-000 – shipped in new production chill-
ers until September 2003. The program resides in
a replaceable Flash Memory Card. The software
version (C.MLM.02.xx.yzz) is printed on label
adhered to card. Program can be upgraded by
replacing the card.
• 031-02430-000 – shipped in new production chill-
ers after September 2003. The program resides in
non-removable onboard memory. The software
2

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FORM 160.55-O1 (920)
version is C.OPT.02.xx.yzz, and is viewable on
the DIAGNOSTICS Screen in SERVICE access
level. The program can be upgraded by download-
ing a new program from a Program Card. Program
Cards are shirt-pocket-size portable memory stor-
age devices available from YORK.
Earlier vintage chillers could be equipped with a later
Microboard due to service replacement.
Software versions (C.MLM.02.xx.yzz or
C.OPT.02.xx.yzz) are alpha-numeric codes that rep-
resent the application, language package and revision
levels per below. Each time the controls portion or lan-
guage section is revised, the respective revision level
increments.
• C – Commercial chiller
• MLM – Used on Microboard 031-01730-
000
• OPT - Used on Microboard 031-02430-
000
• 02 – YT chiller
• xx - controls revision level (00, 01, etc)
• y – language package (0=English only,
1=NEMA, 2=CE, 3=NEMA/CE )
• zz – language package revision level (00,
01, etc)
Throughout this book, reference is made to functions and
features that are only available in certain Flash Memory
Card revision levels (C.MLM.02.xx.xxx). To cross refer-
ence C.MLM software to C.OPT software, refer to the
controls revision level. Software version
C.OPT.02.04B.xxx is of the same controls revision
level as C.MLM.02.04.xxx. From this starting point,
both receive the same updates at each revision. Soft-
ware upgrades should only be performed by a Service
Technician.
Description of System and Fundamentals of Operation

FORM 160.55-O1 (920)
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THIS PAGE INTENTIONALLY LEFT BLANK
TO MAINTAIN FORMAT

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FORM 160.55-O1 (920)
When in this position, the chiller will not run under
any condition. For safety reasons, this position is
required for many maintenance tasks to be completed
(such as proximity probe and vane calibration). In
addition, the switch must be placed in this state
following a Safety shutdown before the chiller is
allowed to restart. This guarantees that manual inter-
vention has taken place and the shutdown has been
acknowledged.
The switch can only remain in this position when
being acted upon by a manual force. Once the user
has released the switch, it automatically reverts to
the RUN position. Generally, this state only occurs
momentarily as the operator attempts to locally start
the unit. Once this position has been sensed, if all
fault conditions are cleared, the unit will enter the
system prelube (start sequence).
When in this position, the chiller is able to operate.
The switch spring-returns to this state after it has
been toggled to the START position. When in this
state, the chiller is allowed to function normally and
will also allow the chiller to automatically restart fol-
lowing a Cycling shutdown. The switch must be in
this state to receive a valid remote start signal when
operating under a remote control source.
CONTROL CENTER
The OptiView Control Center display is highlighted by a
full screen graphics display. This display is nested within
a standard keypad and is surrounded by “soft” keys
which are redened based on the currently displayed
screen. Eight buttons are available on the right side of the
panel and are primarily used for navigation between the
system screens. At the base of the display are 5 additional
buttons. The area to the right of the keypad is used for
data entry with a standard numeric keypad provided for
entry of system setpoints and limits.
The Decimal key provides accurate entry of
setpoint values.
A +/- key has also been provided to allow entry
of negative values and AM/PM selection during
time entry.
In order to accept changes made to the chiller
setpoints, the Check key is provided as a uni-
versal ‘Enter’ key or ‘Accept’’ symbol.
In order to reject entry of a setpoint or dismiss
an entry form, the ‘X’ key is provided as a uni-
versal ‘Cancel’ symbol.
Cursor Arrow keys are pro-
vided to allow movement on
screens which contain a large
amount of entry data. In ad-
dition, these keys can be used
to scroll through history and
event logs.
The Start/Stop control is operated via a three-position
rocker switch. When toggled all the way to the right, it is
considered in the STOP/RESET position. When in the
middle position, this is considered the RUN state. When
toggled to the left-most position, it is considered in the
START state. Each state is described in detail below:
• STOP / RESET (O)
• START (◄)
• RUN ( )
00134VIP
FIG. 3
OptiView Control Center

FORM 160.55-O1 (920)
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YORK INTERNATIONAL
OVERVIEW
The new graphical display on each control panel allows
a wide variety of information to be presented to the
user. Each screen description in this document will begin
with a section entitled Overview which will describe
the graphical elements on the screen and give a short
summary of the functions available. Each element on
the screen will then be categorized into three distinct
groups: Display Only, Programmable and Navigation.
Below is a short description of what types of information
are included in these groups.
The Programmable values and Navigation commands
are also subject to access level restrictions as described
below. For each of these elements, an indication is given
to show the minimum access level required to program
the value or navigate to the subscreen.
DISPLAY ONLY
Values in this group are read-only parameters of infor-
mation about the chiller operation. This type of infor-
mation may be represented by a numerical value, a text
string or an LED image. For numerical values, if the
monitored parameter is above the normal operating
range, the high limit value will be displayed along with
the ‘>’symbol; if it is below the normal operating range,
the low limit value will be displayed along with the
‘<’ symbol. In some cases, the value may be rendered
invalid by other conditions and the display will use X’s
to indicate this.
PROGRAMMABLE
Values in this group are available for change by the user.
In order to program any setpoints on the system, the user
must rst be logged in with the appropriate access level.
Each of the programmable values requires a specic Ac-
cess Level which will be indicated beside the specied
value. All of the programmable controls in the system
fall into one of the categories described below:
Access Level
In order to program any setpoints on the system, the user
must rst login with an appropriate access level. When
power is applied to the chiller, the system begins with an
Access Level of VIEW. This will allow the user to navi-
gate to most screens and observe the values displayed
there. However, the user will not be allowed to change
any values. To change any values, the user must return to
the Home Screen (shown by default when power is ap-
plied to the system) and use the LOGIN button or utilize
the CHANGE SETPOINTS key described below. At
this point, the user will be prompted to enter a User ID
and the corresponding Password. By default, the User
ID is zero (0). In order to gain standard OPERATOR
level access, the Password would be entered as 9 6 7 5,
using the numeric keypad. OPERATOR access reverts
to the VIEW level after 10 continuous minutes without
a keypress. If a custom User ID and Password have been
dened (see User Screen), the user may enter that User
ID and the corresponding Password value.
If the correct password is received, the user is autho-
rized with the appropriate Access Level. If an incorrect
password is entered, the user is notied of the failure
and prompted again. At this point the user may retry the
password entry or cancel the login attempt.
Change Setpoints
On screens containing setpoints programmable at the
OPERATOR access level, a key with this label will be
visible if the present access level is VIEW. This key
brings up the Access Level prompt described above. It
allows the user to login at a higher Access Level without
returning to the Home Screen. After login, the user may
then modify setpoints on that screen.
Setpoints
The control center uses the setpoint values to control the
chiller and other devices connected to the chiller system.
Setpoints can fall into several categories. They could be
numeric values (such as 45.0°F for the Leaving Chilled
Liquid Temperature) or they could Enable or Disable a
feature or function.
Regardless of which setpoint is being programmed, the
following procedure applies:
1. Press the desired setpoint key. A dialog box appears
displaying the present value, the upper and lower
limits of the programmable range and the default
value.
2. If the dialog box begins with the word “ENTER”,
use the numeric keys to enter the desired value.
INTERFACE CONVENTIONS
2

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FORM 160.55-O1 (920)
Leading zeroes are not necessary. If a decimal point
is necessary, press the ‘•’ key (i.e. 45.0).
Pressing the ▲ key, sets the entry value to the default
for that setpoint. Pressing the ▼ key, clears the pres-
ent entry. The ◄ key is a backspace key and causes
the entry point to move back one space.
If the dialog box begins with “SELECT”, use the
◄ and ► keys to select the desired value.
If the previously dened setpoint is desired, press
the ‘X’ (Cancel) key to dismiss the dialog box.
3. Press the ‘’ (Enter) key.
If the value is within range, it is accepted and the
dialog box disappears. The chiller will begin to op-
erate based on the new programmed value. If out of
range, the value will not be accepted and the user is
prompted to try again.
Manual Controls
Some keys are used to perform manual control func-
tions. These may involve manual control of items such
as the pre-rotation vanes, variable orice (future) or
hot gas bypass valve. Other keys in this category are
used to initiate/terminate processes such as calibrations
or reports.
Free Cursor
On screens containing many setpoints, a specic “soft”
key may not be assigned to each setpoint value. A soft
key will be assigned to enable the cursor arrow keys
below the numeric keypad which are used to “highlight”
the desired setpoint eld. At this point, the ‘’ key is
pressed to bring up a dialog prompting the user to enter
a new setpoint value. The ‘X’ key cancels cursor mode.
(See the Schedule Screen [Fig. 24] for an example.)
NAVIGATION
In order to maximize the amount of values which the
panel can display to the user and in order to place those
values in context, multiple screens have been designed to
describe the chiller operation. In order to move from one
screen to the next, navigation keys have been dened.
These keys allow the user to either move “forward” to
a subscreen of the present screen or move “backward”
to the previous screen. Except for the Home Screen
display, the upper-right “soft” key will always return
the user to the Home Screen. Navigating with “soft”
keys is as simple as pressing the key next to the label
containing the name of the desired screen. The system
will immediately refresh the display with the graphics
for that screen. Following is a layout of all the screens
and how they are connected.
OptiView Control Center
Home Screen (page 14)
System Screen (page 16)
Evaporator (page 18)
Condenser (page 20)
Purge (page 22)
Refrig. Level Control (page 24)
Compressor (page 26)
Hot Gas Bypass (page 28)
Surge Protection Screen (page 30)
Vane Calibration (page 32)
VSD Tuning (page 34)
Oil Sump (page 36)
Motor (page 37)
EM Starter Version (page 37)
Mod “A” Solid State Starter (page 38)
Mod “B” Solid State Starter (page 40)
VSD Version (page 42)
VSD Details (page 44)
ACC Details (page 48)
Harmonic Filter Details (page 50)
Setpoints (page 54)
Setup (page 56)
Schedule (page 58)
User (page 60)
Comms (page 62)
Printer (page 64)
Sales Order (page 66)
Operations (page 68)
Diagnostics
History (page 70)
History Details (page 72)
Security Log (page 73)
Security Log Details (page 74)
Trend (page 76)
Trend Setup (page 78)
Advanced Trend Setup (page 80)
Common Slots (page 82)
Custom View (page 83)
Custom Setup (page 84)

FORM 160.55-O1 (920)
15
YORK INTERNATIONAL
ANALOG INPUT RANGES
The following table indicates the valid display range for each of the analog input values. In the event that the input
sensor is reading a value outside of these ranges, the < or > symbols will be displayed beside the minimum or maxi-
mum value, respectively.
*Saturation temperatures are calculated values. They will display XXX if the pressure used for the calculation is out of range.
ANALOG INPUT ENGLISH RANGE METRIC RANGE
LOW HIGH UNITS LOW HIGH UNITS
Leaving Chilled Liquid Temperature 0.0 82.0 °F -17.7 27.7 °C
Return Chilled Liquid Temperature 0.0 94.1 °F -17.7 34.5 °C
Leaving Condenser Liquid Temperature 8.0 133.5 °F -13.3 56.3 °C
Return Condenser Liquid Temperature 8.0 133.5 °F -13.3 56.3 °C
Evaporator Refrigerant Temperature 0.0 126.1 °F -17.7 52.3 °C
Discharge Temperature 19.0 226.3 °F -7.2 107.9 °C
Oil Temperature 19.0 226.3 °F -7.2 107.9 °C
Condenser Pressure 2.5 35.3 PSIA 17.2 243.4 KPAA
Condenser Temperature (R11)* -1.4 124.2 °F -18.5 51.2 °C
Condenser Temperature (R123)* 7.2 130.1 °F -13.7 54.5 °C
Evaporator Pressure 0.0 12.5 PSIA 6.9 86.2 KPAA
Evaporator Temperature (R11)* -31.2 66.8 °F -35.7 19.3 °C
Evaporator Temperature (R123)* -22.4 74.2 °F -30.2 23.4 °C
Oil Sump Pressure 2.9 20.9 PSIA 20.0 144.1 KPAA
Oil Pump Pressure 14.3 78.2 PSIA 98.6 539.2 KPAA
Purge Pressure 0.0 100.0 PSIA 6.9 689.5 KPAA
Refrigerant Level (Future) 0.0 100.0 % 0.0 100.0 %
Drop Leg Refrigerant Temperature 0.0 121.8 °F -17.7 49.8 °C
2
LANGUAGES
The Screens can be displayed in various languages. Lan-
guage selection is done on the USER Screen. The desired
language is selected from those available. Not all languages
are available. English is the default language. If a language
other than English is being displayed, an English-only speak-
ing person should navigate to the USER Screen using the
preceding Navigation chart and select English per the USER
Screen instructions in this book.

YORK INTERNATIONAL
16
FORM 160.55-O1 (920)
HOME SCREEN
OVERVIEW
When the chiller system is powered on, the above de-
fault display appears. The primary values which must
be monitored and controlled are shown on this screen.
The Home Screen display depicts a visual representation
of the chiller itself. Animation indicates chilled liquid
ow.
DISPLAY ONLY
Chilled Liquid Temperature - Leaving
Displays the temperature of the liquid as it leaves the
evaporator.
Chilled Liquid Temperature - Return
Displays the temperature of the liquid as it enters the
evaporator.
Condenser Liquid Temperature - Leaving
Displays the temperature of the liquid as it leaves the
condenser.
Condenser Liquid Temperature - Return
Displays the temperature of the liquid as it enters the
condenser.
Motor Run (LED)
Is ON when the digital output controlling the Motor
Starter contact is on.
Input Power (kW)
Available only if the chiller system is utilizing a Vari-
able Speed Drive motor controller or Mod “B” Solid
State Starter. This displays the total input power used
by the system.
% Full Load Amps
This displays the percentage of full load amps utilized
by the system.
Operating Hours
Displays the cumulative operating hours of the chiller.
PROGRAMMABLE
Login
Access Level Required: VIEW
The Control Center restricts certain operations based
on password entry by the operator. Three dierent ac-
cess levels are provided as follows: VIEW: The panel
defaults to the lowest access level which is termed
VIEW. In this mode, the chiller operating values and
setpoints can be observed, but no changes can be made.
OPERATOR: The second access level is termed OP-
ERATOR and will allow the customer to change all
of the setpoints required to operate the chiller system.
The OPERATOR access level reverts to the VIEW
level after 10 continuous minutes without a keypress.
SERVICE: In the event that advanced diagnostics are
necessary, a SERVICE access level has been provided.
00347VIP
FIG. 4
OptiView Control Center

FORM 160.55-O1 (920)
17
YORK INTERNATIONAL
Only qualied service personnel utilize this access level.
This level provides advanced control over many of the
chiller functions and allows calibration of many of the
chiller controls. The access levels are listed above in
hierarchical order beginning with the lowest level and
proceeding to the highest level. Users logged in under
higher access levels may perform any actions permitted
by lower access levels.
The OPERATOR access level is accompanied by a
10-minute timeout. After ten (10) successive minutes
without a keypress, the panel will revert to the VIEW
access level. This prevents unauthorized changes to the
chiller if a user was logged in at a higher access level
and failed to logout. Proper procedure requires that after
making necessary setpoint adjustments the user return
to the Home Screen and logout.
Logout
Access Level Required: OPERATOR
This key is displayed when a user is logged in at any
level other than VIEW. Pressing it will return the access
level to VIEW.
Print
Access Level Required: VIEW
Use this key to generate a hard-copy report of the present
system status. This provides a snapshot of the primary
operating conditions at the time the key is pressed. The
History page provides enhanced reporting capability.
(See HISTORY below.) This option will not be present
if the chiller is presently congured to log any incoming
Adaptive Capacity Control map points. (See the Adap-
tive Capacity Control Details screen.)
Message Clear
Access Level Required: SERVICE
When certain safety or cycling conditions have been
detected and the chiller has been shutdown, the main
status display of the chiller will continue to display a
message indicating the cause of the shutdown. Using
this key, the message can be cleared once the condition
has been removed.
Warning Reset
Access Level Required: OPERATOR
Use of this key acknowledges a warning condition and
resets the message display associated with it.
NAVIGATION
System
Used to provide additional system information.
Evaporator
A detailed view of all evaporator parameters, including
the programmable Leaving Chilled Liquid Setpoints.
Condenser
A detailed view of all condenser parameters, including
control of the purge functions.
Compressor
A detailed view of all the compressor parameters. This
includes pre-rotation vane control, Hot Gas Bypass
Control and PRV calibration.
Oil Sump
A detailed view of all the oil pump and oil sump pa-
rameters.
Motor
A detailed view of the motor controller parameters, spe-
cic to the controller type presently utilized on the chiller
system. This allows programming of the Current Limit
and the Pulldown Demand Limit values. For a VSD
system, the Adaptive Capacity Control and Harmonic
Filter information is controlled under this screen.
Setpoints
This screen provides a single location to program the
most common system setpoints. It is also the gateway
to many of the general system setup parameters such as
Date/Time, Display Units, Scheduling, Printer Setup,
etc.
History
This screen provides access to a snapshot of system data
at each of the last 10 shutdown conditions.
2

YORK INTERNATIONAL
18
FORM 160.55-O1 (920)
SYSTEM SCREEN
OVERVIEW
This screen gives a general overview of common chiller
parameters for both shells.
DISPLAY ONLY
Discharge Temperature
Displays the temperature of the refrigerant in its gas-
eous state at discharge of the compressor as it travels
to the condenser.
Chilled Liquid Temperature - Leaving
Displays the temperature of the liquid as it leaves the
evaporator.
Chilled Liquid Temperature - Return
Displays the temperature of the liquid as it enters the
evaporator.
Chilled Liquid Temperature - Setpoint
Displays the active temperature setpoint to which the
chiller is controlling the evaporator liquid. This value
could come from a 0-20mA or 4-20mA, 0-10VDC or 2-
10VDC input in Analog Remote mode, PWM signal in
Digital Remote mode, MicroGateway interface in ISN
mode or a locally programmed value in local mode.
Evaporator Pressure
Displays the present refrigerant pressure in the evaporator.
Evaporator Saturation Temperature
Displays the present saturation temperature in the
evaporator.
Condenser Liquid Temperature - Leaving
Displays the temperature of the liquid as it leaves the
condenser.
Condenser Liquid Temperature - Return
Displays the temperature of the liquid as it enters the
condenser.
Condenser Pressure
Displays the refrigerant pressure in the condenser.
Condenser Saturation Temperature
Displays the saturation temperature in the condenser.
Oil Sump Temperature
Displays the temperature of the oil in the sump.
Oil Pressure
Displays the pressure dierential between the pump oil
pressure transducer and the sump oil pressure transducer.
If either of the transducers used to calculate this dier-
ential is out of range, the display eld will show XX.X.
% Full Load Amps
This displays the percentage of full load amps utilized
by the system.
00348VIP
FIG. 5
OptiView Control Center

FORM 160.55-O1 (920)
19
YORK INTERNATIONAL
Current Limit
Displays the current limit value in use. This value could
come from a 0-20mA or 4-20mA, 0-10VDC or 2-10VDC
input in Analog Remote mode, PWM signal in Digital
Remote mode, MicroGateway interface in ISN mode or
a locally programmed value.
PROGRAMMABLE
None
NAVIGATION
Home
Access Level Required: VIEW
Causes an instant return to the Home Screen.
2

YORK INTERNATIONAL
20
FORM 160.55-O1 (920)
EVAPORATOR SCREEN
OVERVIEW
This screen displays a cutaway view of the chiller evap-
orator. 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. Animation of the liquid
ow indicates chilled liquid ow.
DISPLAY ONLY
Chilled Liquid Flow Switch (Open / Closed)
Displays whether the liquid ow is present in the
evaporator.
Chilled Liquid Pump
Displays the command presently sent by the control
center to the Chilled Liquid Pump (RUN or STOP).
Evaporator Pressure
Displays the present refrigerant pressure in the evaporator.
Evaporator Saturation Temperature
Displays the present saturation temperature in the evap-
orator.
Return Chilled Liquid Temperature
Displays the temperature of the liquid as it enters the
evaporator.
Leaving Chilled Liquid Temperature
Displays the temperature of the liquid as it leaves the
evaporator.
Evaporator Refrigerant Temperature
Displays the temperature of the refrigerant in the evapo-
rator, if the sensor is present.
Small Temperature Dierence
Displays the dierence between the Leaving Chilled
Liquid temperature and the Evaporator Refrigerant tem-
perature. The Evaporator Refrigerant temperature will be
represented by the Refrigerant Temperature sensor input
if the sensor is present, otherwise it will be represented
by the Evaporator Saturation temperature.
Leaving Chilled Liquid Temperature Setpoints –
Setpoint
Displays the present setpoint to which the chiller is oper-
ating, whether controlled locally or remotely.
Leaving Chilled Liquid Temperature Setpoints
– Shutdown
Displays the Leaving Chilled Liquid Temperature at which
the chiller will shut down to avoid over-cooling the build-
ing. By default this value is 4°F below the Leaving Chilled
Setpoint.
Leaving Chilled Liquid Temperature Setpoints
– Restart
Displays the Leaving Chilled Liquid Temperature at
which the chiller will restart after it has shut down due
to over-cooling temperature. By default, the chiller
will restart at the Leaving Chilled Liquid Temperature
Setpoint.
00349VIP
FIG. 6
OptiView Control Center