York YR User manual

OPERATING & MAINTENANCE
ROTARY SCREW LIQUID CHILLERS
Supersedes: Form 160.81-O1 (311) Form 160.81-O1 (1020)
MODEL YR (STYLE A, B, & C)
WITH OPTIVIEW™CONTROL CENTER
FOR ELECTRO-MECHANICAL STARTER &
SOLID STATE STARTER
00562VIP
Issue Date
October 5, 2020

JOHNSON CONTROLS
2
FORM 160.81-O1 (1020)
ISSUE DATE 10/05/2020
This equipment is a relatively complicated apparatus.
During installation, operation, maintenance or service,
individuals may be exposed to certain components or
conditions including, but not limited to: refrigerants,
oils, materials under pressure, rotating components, and
both high and low voltage. Each of these items has the
potential, if misused or handled improperly, to cause
bodily injury or death. It is the obligation and respon-
sibility of operating/service personnel to identify and
recognize these inherent hazards, protect themselves,
and proceed safely in completing their tasks. Failure
to comply with any of these requirements could result
in serious damage to the equipment and the property in
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
operating/service personnel. It is expected that this in-
dividual possesses independent training that will en-
able them to perform their assigned tasks properly and
safely. It is essential that, prior to performing any task
on this equipment, this individual shall have read and
understood this document and any referenced mate-
rials. This individual shall also be familiar with and
comply with all applicable 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 areas of potential hazard:
WARNING indicates a potentially haz-
ardous situation which, if not avoided,
could result in death or serious injury.
DANGER indicates an imminently haz-
ardous situation which, if not avoided,
will result in death or serious injury.
CAUTION identifies a hazard which
could lead to damage to the machine,
damage to other equipment and/or envi-
ronmental pollution. Usually an instruc-
tion will be given, together with a brief
explanation.
External wiring, unless specied as an optional connection in the manufacturer’s product line, is
not to be connected inside the micro panel cabinet. Devices such as relays, switches, transducers and
controls may not be installed inside the micro panel. No external wiring is allowed to be run through
the micro panel. All wiring must be in accordance with Johnson Controls published specications
and must be performed only by qualied Johnson Controls personnel. Johnson Controls will not be
responsible for damages/problems resulting from improper connections to the controls or application
of improper control signals. Failure to follow this will void the manufacturer’s warranty and cause
serious damage to property or injury to persons.
NOTE is used to highlight additional in-
formation which may be helpful to you.

FORM 160.81-O1 (1020)
ISSUE DATE 10/05/2020
3
JOHNSON CONTROLS
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-uat.fluidtopics.net/chillers/home.
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
DESCRIPTION FORM NO.
SOLID STATE STARTER (MOD “B”) – OPERATION & MAINTENANCE 160.00-O2
INSTALLATION 160.81-N1
OPTIVIEW™ CONTROL CENTER – SERVICE INSTRUCTIONS 160.81-M1
WIRING DIAGRAM – UNIT WITH ELECTRO-MECHANICAL STARTER 160.81-PW1
WIRING DIAGRAM – UNIT WITH MOD “B” SOLID STATE STARTER 160.81-PW2
RENEWAL PARTS – UNIT 160.81-RP1
RENEWAL PARTS – OPTIVIEW™ CONTROL CENTER 160.81-RP3
AFFECTED PAGES DESCRIPTION
3 Conditioned Based Maintenance 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 traditional
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.

JOHNSON CONTROLS
4
FORM 160.81-O1 (1020)
ISSUE DATE 10/05/2020
MOTOR CODE
60 Hz 50 Hz
CF 5CC
CG 5CD
CH 5CE
CJ 5CF
CK 5CG
CL 5CH
CM 5CI
CN 5CJ
CP 5CK
CR 5CL
CS 5CM
CT 5CN
CU 5CO
CV
YR TA TA T0 – A
DESIGN LEVEL
POWER SUPPLY
– for 60 Hz
5 for 50 Hz
COMPRESSOR CODE
T0, T1, T2, T3, T4, T5
CONDENSER CODE
TA, TB, TC, TD, TE, TF
XA, XB, XC, XE, XF, XG
ZA, ZB, ZC, ZD, ZE, ZF
TA, TB, TC, TD, TE, TF
XA, XB, XC, XE, XF, XG
ZA, ZB, ZC, ZD, ZE, ZF
MODEL
COOLER CODE

FORM 160.81-O1 (1020)
ISSUE DATE 10/05/2020
5
JOHNSON CONTROLS
TABLE OF CONTENTS
SECTION 1 - DESCRIPTION OF SYSTEM AND FUNDAMENTALS OF OPERATION ......................................... 11
System Operation Description........................................................................................................................ 11
Capacity Control.............................................................................................................................................12
Chiller Operation Overview ............................................................................................................................ 12
SECTION 2 - OPTIVIEW™ CONTROL CENTER................................................................................................... 17
Introduction.....................................................................................................................................................17
Start/Stop Control...........................................................................................................................................18
Stop / Reset (O) ....................................................................................................................................19
Start (◄ )...............................................................................................................................................19
Run ( ■ ) ................................................................................................................................................19
Interface Conventions ....................................................................................................................................19
Overview ...............................................................................................................................................19
Display Only ..........................................................................................................................................19
Programmable.......................................................................................................................................19
Navigation .............................................................................................................................................21
Languages.............................................................................................................................................22
Analog Input Ranges.............................................................................................................................22
Home Screen .................................................................................................................................................23
System Screen ...............................................................................................................................................25
Evaporator Screen .........................................................................................................................................27
Sensitivity Screen...........................................................................................................................................31
Condenser Screen .........................................................................................................................................32
Refrigerant Level Control Screen ...................................................................................................................34
Compressor Screen .......................................................................................................................................36
Hot Gas Bypass Screen .................................................................................................................................39
Oil Separator Screen......................................................................................................................................40
Electro-Mechanical Starter Screen.................................................................................................................42
Mod “B” Solid State Starter Screen ................................................................................................................ 44
Ground Fault Protection Screen.....................................................................................................................46
Setpoints Screen ............................................................................................................................................48
Setup Screen..................................................................................................................................................51
Schedule Screen ............................................................................................................................................54
User Screen ...................................................................................................................................................56
Comms Screen...............................................................................................................................................58
Printer Screen ................................................................................................................................................60
Sales Order Screen........................................................................................................................................61
Operations Screen .........................................................................................................................................63
History Screen................................................................................................................................................65
History Details Screen....................................................................................................................................67
Security Log Screen .......................................................................................................................................68
Security Log Details Screen ...........................................................................................................................70
Custom View Screen......................................................................................................................................71
Custom Setup Screen ....................................................................................................................................72
Trending Screen .............................................................................................................................................73
Trend Setup Screen .......................................................................................................................................75
Advanced Trend Setup Screen ......................................................................................................................77
Trend Common Slots Screen ........................................................................................................................79
Master Slot Numbers List For Use With Trend Feature ........................................................................80

JOHNSON CONTROLS
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FORM 160.81-O1 (1020)
ISSUE DATE 10/05/2020
TABLE OF CONTENTS (CONT'D)
SECTION 3 - DISPLAY MESSAGES ......................................................................................................................83
Status Messages............................................................................................................................................83
System Ready To Start..........................................................................................................................83
Cycling Shutdown – Auto Restart..........................................................................................................83
Safety Shutdown – Manual Restart.......................................................................................................83
System Run...........................................................................................................................................83
Start Inhibit ............................................................................................................................................83
Slide Valve Unloading Before Shutdown...............................................................................................83
System Lockout Delay...........................................................................................................................84
Run Messages ...............................................................................................................................................84
Leaving Chilled Liquid Control...............................................................................................................84
Motor-Pulldown Limit ............................................................................................................................84
Motor - High Current Limit .....................................................................................................................84
Maximum Load - Load Limit ..................................................................................................................84
Minimum Load - Load Limit ...................................................................................................................84
Start Inhibit Messages....................................................................................................................................85
Anti-Recycle Xxmin/Sec .......................................................................................................................85
Motor Current >15% FLA ......................................................................................................................85
LCSSS - High Temperature Phase X - Stopped.................................................................................... 85
Warning Messages.........................................................................................................................................85
Warning – Real Time Clock Failure....................................................................................................... 85
Warning – Setpoint Override .................................................................................................................85
Warning – Condenser – High Pressure Limit ........................................................................................85
Warning – Evaporator – Low Pressure Limit .........................................................................................85
Warning – Freeze Threat From Operating Chiller .................................................................................85
Warning – Freeze Threat, Condenser Flow Switch Open.....................................................................86
Warning – Discharge – High Pressure Limit..........................................................................................86
Warning – Low Discharge Superheat Limit ..........................................................................................86
Warning – Low Discharge Superheat Detected ....................................................................................86
Warning – Oil - Dirty Filter .....................................................................................................................86
Warning – Oil - High Temperature .........................................................................................................86
Warning – Condenser – High Refrigerant Level.................................................................................... 86
Warning – Condenser – Low Refrigerant Level.....................................................................................86
Warning – Condenser – Unstable Refrigerant Level.............................................................................86
Routine Shutdown Messages.........................................................................................................................86
Remote Stop .........................................................................................................................................86
Local Stop .............................................................................................................................................87
Place Compressor Switch In Run Position............................................................................................87
Cycling Shutdown Messages .........................................................................................................................87
Multiunit Cycling – Contacts Open ........................................................................................................87
System Cycling – Contacts Open..........................................................................................................87
Control Panel – Power Failure ..............................................................................................................87
Leaving Chilled Liquid –Low Temperature ............................................................................................ 87
Leaving Chilled Liquid – Flow Switch Open ..........................................................................................87
Condenser – Flow Switch Open............................................................................................................87
Motor Controller – Loss Of Current .......................................................................................................88
Power Fault ...........................................................................................................................................88
Control Panel – Schedule......................................................................................................................88

FORM 160.81-O1 (1020)
ISSUE DATE 10/05/2020
7
JOHNSON CONTROLS
TABLE OF CONTENTS (CONT'D)
Mod “B” Solid State Starter Cycling Shutdown Messages .............................................................................88
LCSSS Initialization Failed ....................................................................................................................88
LCSSS - Serial Communications ..........................................................................................................88
LCSSS Shutdown - Requesting Fault Data...........................................................................................88
LCSSS - Stop Contacts Open ...............................................................................................................88
LCSSS - Power Fault ............................................................................................................................88
LCSSS - Low Phase (X) Temperature Sensor ......................................................................................88
LCSSS - Run Signal..............................................................................................................................89
LCSSS - Invalid Current Scale Selection ..............................................................................................89
LCSSS - Phase Locked Loop................................................................................................................89
LCSSS - Low Supply Line Voltage........................................................................................................89
LCSSS - High Supply Line Voltage ....................................................................................................... 89
LCSSS - Logic Board Processor ...........................................................................................................89
LCSSS - Logic Board Power Supply .....................................................................................................89
LCSSS - Phase Loss.............................................................................................................................89
Safety Shutdown Messages...........................................................................................................................90
Evaporator – Low Pressure...................................................................................................................90
Evaporator – Low Pressure - Smart Freeze..........................................................................................90
Evaporator – Transducer Or Leaving Liquid Probe...............................................................................90
Evaporator – Transducer Or Temperature Sensor ................................................................................90
Condenser – High Pressure Contacts Open .........................................................................................91
Condenser – High Pressure ..................................................................................................................91
Condenser – High Pressure – Stopped.................................................................................................91
Condenser – Pressure Transducer Out Of Range ................................................................................ 91
Auxiliary Safety – Contacts Closed .......................................................................................................91
Discharge – High Pressure ...................................................................................................................91
Discharge – High Temperature..............................................................................................................91
Discharge – Low Temperature ..............................................................................................................91
Excessive Low Discharge Superheat....................................................................................................91
Oil – High Temperature .........................................................................................................................92
Oil – Low Di󰀨erential Discharge Oil Pressure .......................................................................................92
Oil Or Condenser Transducer Error ......................................................................................................92
Oil - Clogged Filter ................................................................................................................................92
Oil - High Pressure ................................................................................................................................92
Oil Separator – Low Level .....................................................................................................................92
Control Panel – Power Failure ..............................................................................................................93
Motor Or Starter – Current Imbalance...................................................................................................93
Watchdog – Software Reboot................................................................................................................93
Motor – Phase Rotation.........................................................................................................................93
Motor – High Motor Temperature .......................................................................................................... 93
Motor – Ground Fault ............................................................................................................................93
105% Motor Current Overload ..............................................................................................................93
Mod “B” Solid State Starter Safety Shutdown Messages............................................................................... 94
LCSSS Shutdown - Requesting Fault Data...........................................................................................94
LCSSS - High Instantaneous Current ...................................................................................................94
LCSSS - High Phase (X) Heatsink Temperature - Running ..................................................................94
LCSSS - 105% Motor Current Overload ...............................................................................................94
LCSSS - phase (X) Shorted SCR..........................................................................................................94
LCSSS - Open SCR ..............................................................................................................................94
LCSSS – Phase (X) Open SCR ............................................................................................................94
LCSSS - Phase Rotation.......................................................................................................................94

JOHNSON CONTROLS
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FORM 160.81-O1 (1020)
ISSUE DATE 10/05/2020
TABLE OF CONTENTS (CONT'D)
SECTION 4 - PRINTERS ........................................................................................................................................95
Reports...........................................................................................................................................................95
Printer Types ..................................................................................................................................................95
Okidata ..................................................................................................................................................95
Weigh-Tronix .........................................................................................................................................95
Seiko .....................................................................................................................................................95
Printer Connections........................................................................................................................................97
Okidata 182, 182 turbo, 184 turbo.........................................................................................................97
Weigh-Tronix .........................................................................................................................................97
Seiko .....................................................................................................................................................97
Hardware...............................................................................................................................................97
Printer Setup ..................................................................................................................................................97
Okidata 182, 182 Turbo, 184 Turbo Printer...........................................................................................97
Weigh - Tronix Printer............................................................................................................................98
Seiko .....................................................................................................................................................98
Chiller ID................................................................................................................................................98
Printer Setup .........................................................................................................................................99
Printer Type ...........................................................................................................................................99
Automatic Data Logging ........................................................................................................................99
Temperature ........................................................................................................................................108

FORM 160.81-O1 (1020)
ISSUE DATE 10/05/2020
9
JOHNSON CONTROLS
LIST OF FIGURES
FIGURE 1 - MODEL YR CHILLER ....................................................................................................................... 11
FIGURE 2 - REFRIGERATION FLOW THROUGH ROTARY SCREW CHILLER.............................................12
FIGURE 3 - OPTIVIEW™ CONTROL CENTER..................................................................................................17
FIGURE 4 - HOME SCREEN................................................................................................................................23
FIGURE 5 - SYSTEM SCREEN............................................................................................................................25
FIGURE 6 - EVAPORATOR SCREEN..................................................................................................................27
FIGURE 7 - SENSITIVITY SCREEN....................................................................................................................31
FIGURE 8 - CONDENSER SCREEN ...................................................................................................................32
FIGURE 9 - REFRIGERANT LEVEL CONTROL SCREEN ................................................................................34
FIGURE 10 - COMPRESSOR SCREEN..............................................................................................................36
FIGURE 11 - HOT GAS BYPASS SCREEN.........................................................................................................39
FIGURE 12 - OIL SEPARATOR SCREEN ...........................................................................................................40
FIGURE 13 - ELECTRO-MECHANICAL STARTER SCREEN ...........................................................................42
FIGURE 14 - MOD “B” SOLID STATE STARTER SCREEN ...............................................................................44
FIGURE 15 - GROUND FAULT PROTECTION SCREEN ..................................................................................46
FIGURE 16 - SETPOINTS SCREEN....................................................................................................................48
FIGURE 17 - SETUP SCREEN.............................................................................................................................51
FIGURE 18 - SCHEDULE SCREEN.....................................................................................................................54
FIGURE 19 - USER SCREEN...............................................................................................................................56
FIGURE 20 - COMMS SCREEN...........................................................................................................................58
FIGURE 21 - PRINTER SCREEN.........................................................................................................................60
FIGURE 22 - SALES ORDER SCREEN ..............................................................................................................61
FIGURE 23 - OPERATIONS SCREEN.................................................................................................................63
FIGURE 24 - HISTORY SCREEN.........................................................................................................................65
FIGURE 25 - HISTORY DETAILS SCREEN........................................................................................................67
FIGURE 26 - SECURITY LOG SCREEN .............................................................................................................68
FIGURE 27 - SECURITY LOG DETAILS SCREEN ............................................................................................70
FIGURE 28 - CUSTOM VIEW SCREEN ..............................................................................................................71
FIGURE 29 - CUSTOM SETUP SCREEN ...........................................................................................................72
FIGURE 30 - TREND SCREEN ............................................................................................................................73
FIGURE 31 - TREND SETUP SCREEN...............................................................................................................75
FIGURE 32 - ADVANCED TREND SETUP SCREEN .........................................................................................77
FIGURE 33 - TREND COMMON SLOTS SCREEN ............................................................................................ 79
FIGURE 34 - PRINTERS.......................................................................................................................................96
FIGURE 35 - SAMPLE PRINTOUT (STATUS)...................................................................................................100
FIGURE 36 - SAMPLE PRINTOUT (SETPOINT REPORT) .............................................................................101
FIGURE 37 - SAMPLE PRINTOUT (SCHEDULE) ............................................................................................103
FIGURE 38 - SAMPLE PRINTOUT (SALES ORDER) ......................................................................................104
FIGURE 39 - SAMPLE PRINTOUT (HISTORY) ................................................................................................105
FIGURE 40 - SAMPLE PRINTOUT (SECURITY LOG REPORT) ....................................................................106
FIGURE 41 - SAMPLE PRINTOUT (TREND DATA NEW OR EXISTING POINTS) ....................................... 107
FIGURE 42 - SAMPLE PRINTOUT (CUSTOM SCREEN REPORT) ...............................................................107

10 JOHNSON CONTROLS
FORM 160.81-O1 (1020)
ISSUE DATE 10/05/2020
THIS PAGE INTENTIONALLY LEFT BLANK

FORM 160.81-O1 (1020)
ISSUE DATE 10/05/2020
11
JOHNSON CONTROLS
SECTION 1 - DESCRIPTION OF SYSTEM AND FUNDAMENTALS OF OPERATION
1
In operation, a liquid (water or brine to be chilled) flows
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 flows through finned 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, flows to the compressor where ro-
tary screw action compresses it increasing its pressure
and temperature and discharges it into the Oil Separa-
tor section which removes the oil before the high pres-
sure gas flows into the condenser tube bundle. Water
flowing through the condenser tubes absorbs heat from
the refrigerant vapor, causing it to condense. The con-
denser water is supplied to the chiller from an external
source, usually a cooling tower. The condensed refrig-
erant drains from the condenser into the liquid return
line, where the Variable Orifice meters the flow of liq-
uid refrigerant to the cooler to complete the refrigerant
circuit.
SYSTEM OPERATION DESCRIPTION
The YORK Model YR Chiller is applied to large air con-
ditioning systems, but may be used on other applications.
The chiller consists of a hermetic motor connected to a
rotary screw compressor, an Oil Separator, a condenser, a
cooler and an OptiView™ Control Center.
The chiller is controlled by a modern state of the art
Graphic Control Center that monitors its operation. The
Control Center is programmed by the operator to suit job
specifications. 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 dis-
play. Other displays can be observed by pressing the keys
as labeled on the Control Center. The chiller with the Op-
tiView™ Control Center is applied with an Electro-Me-
chanical Starter, or YORK Solid State Starter (optional).
FIGURE 1 - MODEL YR CHILLER
00562VIP
CONTROL
CENTER
OIL
SEPARATOR
SIGHT GLASS CONDENSER
VARIABLE
ORIFICE
SOLID STATE
STARTER
SECTION1-DESCRIPTIONOFSYSTEMANDFUNDAMENTALSOFOPERATION

JOHNSON CONTROLS
12
FORM 160.81-O1 (1020)
ISSUE DATE 10/05/2020
SECTION 1 - DESCRIPTION OF SYSTEM AND FUNDAMENTALS OF OPERATION
FIGURE 2 - REFRIGERATION FLOW THROUGH ROTARY SCREW CHILLER
LD04976
The major components of a chiller are selected to han-
dle 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 rela-
tively 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. A slide valve arrangement located on the
rotary screw compressor compensates for various load
conditions. The slide valve arrangement is controlled
by the OptiView™ Control Center and unit controls
that sense the building load conditions. The control
center sends signals to the solenoid valve that loads and
unloads the slide valve with the use of compressor oil
under hydraulic pressure. A cylinder located in the inlet
end of the compressor houses a spring loaded shaft and
pistons (slide valve) which is fed through its ports by
pressurized compressor oil. The flow of the oil is con-
trolled by the equalizing solenoid valve which modu-
lates to load and unload the slide valve that increases
or decreases the amount of refrigerant flowing to the
compressor, thus controlling the chiller capacity.
CHILLER OPERATION OVERVIEW
In the following description, reference is made to pro-
cedures that should be performed only by a Service
Technician. Instructions for these procedures are in
OptiView Control Center Service Instructions (Form
160.81-M1 and require SERVICE access level.
The chiller will be permitted to start only if there are no
Safety or Cycling shutdown conditions in effect.
When a Local or Remote start signal is applied, the
“Start Sequence Initiated” period begins. The duration
of this period depends on whether or not the Refriger-

FORM 160.81-O1 (1020)
ISSUE DATE 10/05/2020
13
JOHNSON CONTROLS
SECTION 1 - DESCRIPTION OF SYSTEM AND FUNDAMENTALS OF OPERATION
1
After the first 3 minutes of System Run and for the
remainder of System Run, if the Differential Discharge
Oil Pressure decreases to following threshold for 2
continuous seconds, a safety shutdown is performed
and “Oil – Low Differential Discharge Oil Pressure”
is displayed: [(evap press/10) +20] PSID with soft-
ware version C.OPT.05.09.303 and later or less than
[(evap pressure/10) +15] PSID with software version
C.OPT.05.08.303 and earlier.
After the first 3 minutes and for the remainder of Sys-
tem Run, the Minimum Load Control feature prevents
the slide valve from unloading to a point that will not
allow sufficient oil transfer to the Oil Separator. The
slide valve position at which insufficient oil transfer
occurs is based on compressor motor current. The op-
erating point at which the low separator oil level oc-
curs, can be found by manually unloading the slide
valve while observing the system conditions. Once
established, the minimum allowed slide valve posi-
tion is that which will maintain the compressor motor
current above the programmed Minimum Load FLA
(15% to 70%) setpoint. When the slide valve unloads
to the point the motor current decreases to the setpoint
value, no more unload pulses will be applied. If it un-
loads to the point where the motor current is less than
the setpoint, a 1 second load pulse is applied every 3
seconds until the motor current is more than or equal
to the Minimum Load FLA setpoint value. While the
slide valve unloading is being inhibited, “MINIMUM
LOAD – LOAD LIMIT” is displayed on the System
Details Line of the Display.
Later in 2007, new production chillers are equipped
with an oil level sensor in the Oil Separator. The Low
Separator Oil LED on the OIL SEPERATOR screen
indicates the oil level status. With sufficient level, it is
extinguished. With insufficient level, it is illuminated.
After the chiller has been running for at least 3 minutes,
if the level sensor opens for 30 continuous seconds,
a safety shutdown is performed and “Oil Separator –
Low Level” is displayed. The chiller can be restarted
after the COMPRESSOR switch is placed in the Stop-
Reset (O) position and sufficient oil has been added to
allow the Sensor to see sufficient level and provide a
closed circuit to the Microboard.
After the chiller has been running for more than 3 min-
utes, the slide valve is loaded and unloaded to control
the Leaving Chilled Liquid Temperature to the Leav-
ing Chilled Liquid Temperature setpoint (as explained
later, there is no unloading in Ice Storage mode). The
SENSITIVITY setpoints can be adjusted by a Service
ant Level Control feature is enabled. If the Refriger-
ant Level Control feature is disabled, the duration is 30
seconds. If the Refrigerant Level Control is enabled,
the duration is programmable over the range of 30 to
300 seconds with the Valve Preset Time setpoint. The
Variable Orifice must be positioned to the 75% closed
position prior to starting the compressor motor. Since
it is in the fully open position while the chiller is shut-
down, the valve is driven to the 75% closed position
during the “Start Sequence Initiated” period. Due to
variances in Orifice actuator timing and valve position
requirements for the different chiller/compressor com-
binations, the “Start Sequence Initiated” period dura-
tion must be adjusted to allow the Orifice to reach the
75% closed position prior to starting the compressor
motor. “Start Sequence Initiated” is displayed on the
Display System Status Line along with a countdown
timer indicating time remaining while the period is in
effect.
During the first 15 seconds of the “Start Sequence
Initiated” period, early vintage chillers performed the
pressure transducer auto-zeroing. Beginning with soft-
ware versions C.OPT.05.09.303 (and later), the auto-
zeroing feature is no longer used. If applicable, refer to
description of this feature, as used in previous software
versions, in OptiView Control Center Service Instruc-
tions (Form 160.81-M1).
The Chilled Liquid Flow Switch position is checked
5 seconds before the end of the “Start Sequence Initi-
ated” period. If not closed, a cycling shutdown is per-
formed.
At the completion of the start sequence, the Oil Sup-
ply Solenoid Valve is energized (opened), “SYSTEM
RUN” is displayed and the start signal is applied to the
compressor motor starter.
When the Condenser Pump Delay setpoint (0 to 90
seconds) [software version C.MLM.05.06.xxx (and
later) or C.OPT.05.06.xxx (and later)] has elapsed,
condenser pump contacts TB2-150/151 close to start
the condenser pump.
During the first 2 minutes of System Run, a HOLD
output is applied to the slide valve. During the third
minute, if the oil pressure is less than or equal to
((1.1 x evaporator pressure) + 15 PSID), a load out-
put is applied to the slide valve until the oil pressure
is more than or equal to ((1.1 x evaporator pressure)
+ 18 PSID). Also during the first 3 minutes of “Sys-
tem Run”, the Variable Orifice position is maintained
at the 75% closed position and controlled thereafter as
described below.

JOHNSON CONTROLS
14
FORM 160.81-O1 (1020)
ISSUE DATE 10/05/2020
SECTION 1 - DESCRIPTION OF SYSTEM AND FUNDAMENTALS OF OPERATION
Technician to reduce over/under-shoot of the Chilled
Liquid setpoint and adapt the control to the local oper-
ating conditions.
The following Load Limiting conditions will over-
ride the normal Leaving Chilled Liquid Temperature
control. The message displayed for each condition is in
parenthesis. Refer to DISPLAY MESSAGES section
of this book for details of each limit.
• Low Evaporator Pressure (“Warning – Evaporator –
Low Pressure Limit”)
• High Condenser Pressure (“Warning – Condenser –
High Pressure Limit”)
• High Motor current (“Motor-High Current Limit”)
• Low Discharge Superheat (“Warning – Low Dis-
charge Superheat Limit”)
• High Discharge Pressure (“Warning – Discharge –
High Pressure Limit”)
The slide valve can be manually controlled by a Ser-
vice Technician from the COMPRESSOR screen using
the Keypad keys.
To provide oil cooling, liquid refrigerant is injected into
the compressor during high Discharge Temperature
conditions. When the Discharge Temperature increases
to the programmed Liquid Injection setpoint threshold,
a solenoid valve is opened, injecting liquid refrigerant
into the compressor. This setpoint is programmable by
a Service Technician over the range of 130 to 165°F.
(fixed at 165°F in software version C.MLM.05.03.
xxx) When the Discharge Temperature decreases to
10°F below this setpoint, the solenoid valve is closed.
To prevent overcooling the building or process, the chill-
er will shutdown and display “LEAVING CHILLED
LIQUID – LOW TEMPERATURE” when the Leaving
Chilled Liquid Temperature decreases to less than the
programmed Leaving Chilled Liquid Temperature
Cycling Offset-Shutdown setpoint. After it has shut-
down, the chiller is prevented from restarting until the
Leaving Chilled Liquid Temperature has increased to
more than the programmed Leaving Chilled Liquid
Temperature Cycling Offset-Restart setpoint. This
prevents short cycling the chiller.
The chiller can cool WATER or a BRINE solution.
Water can be cooled over a range of 38.0º to 70.0ºF.
If Smart Freeze protection (explained below) is en-
abled, the range is 36.0º to 70.0ºF. Brine solution can
be cooled over a range of 20.0º to 70.0ºF.
Ice Storage mode is an operating mode within Brine
mode that allows the chiller to make ice at a faster than
normal rate by inhibiting unload pulses to the slide
valve. Load pulses are applied until the Leaving Chilled
Liquid Temperature Cycling Offset-Shutdown thresh-
old is reached, whereupon the chiller shuts down. No
unload pulses or hold outputs are applied to the slide
valve unless any of the following load limit conditions
exist:
• Low Evaporator Pressure
• High Condenser Pressure
• High Motor Current
• Low Discharge Superheat
The chiller will automatically restart when the Ice Stor-
age Restart threshold is exceeded. Ice Storage mode
is turned ON from the EVAPORATOR screen. After it
is turned ON, Ice Storage mode is automatically acti-
vated (inhibits unload pulses) and deactivated (allows
unload pulses) by the value programmed for the Leaving
Chilled Liquid Temperature setpoint. Values less than
or equal to 32.0ºF activates Ice Storage mode. Setpoint
values more than 32.0ºF deactivate Ice Storage mode.
An LED on the EVAPORATOR screen illuminates
when Ice Storage mode is active. This allows the chill-
er to be switched in and out of Ice Storage mode by a
Local or Remote change of this setpoint. This feature
allows the chiller to make ice in the nighttime hours
and perform air-conditioning duty during the daytime
hours simply by changing the Leaving Chilled Liquid
Temperature setpoint. When Ice Storage is turned ON,
there are two different Restart setpoints employed: One
is programmed and will be in effect when the Leaving
Chilled Liquid Temperature setpoint is less than or equal
to 32.0ºF (Ice Storage mode active), the other is pro-
grammed and will be in effect when the setpoint is more
than 32.0ºF (Ice Storage mode not active). Each Restart
setpoint can be programmed to a different value.
Since liquid refrigerant is transferred from the Con-
denser to the Evaporator via the Condenser-Evaporator
pressure differential, a large differential can create an
excess refrigerant level in the evaporator. A small dif-
ferential can result in insufficient level in the Evapora-
tor. To maintain an appropriate refrigerant level in the
Evaporator under all conditions, the chiller is equipped
with a Variable Orifice. To maintain an appropriate
refrigerant level in the evaporator under all conditions,
a Variable Orifice is located in the refrigerant line be-
tween the condenser and evaporator.

FORM 160.81-O1 (1020)
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SECTION 1 - DESCRIPTION OF SYSTEM AND FUNDAMENTALS OF OPERATION
1
A liquid level sensor, located in the condenser, detects
the refrigerant level. The refrigerant level in the con-
denser is expressed as 0% (minimum) to 100% (maxi-
mum). While the chiller is shutdown, an open signal is
applied to the actuator, driving the Orifice to the fully
open position. When the chiller is started, a close sig-
nal is applied to the Orifice actuator for the duration of
the “Start Sequence Initiated” period. This positions it
to approximately the 75% closed position prior to start-
ing the compressor motor, which occurs at the end of
the “Start Sequence Initiated” period.
To allow for actuator timing variances and assure the
valve is positioned at the 75% closed position, the du-
ration of the “Start Sequence Initiated” period is pro
grammable over the range of 30 to 300 seconds with
the Valve Preset Time setpoint. This position is held
for the first 3 minutes of “System Run”. After the first
3 minutes, if the actual level is greater than or less than
the setpoint, a linearly increasing or decreasing ramp is
applied to the Level setpoint. This ramp causes the set-
point to increase or decrease (as appropriate) from the
actual position to the programmed setpoint over a de-
fined period. With software version C.OPT.05.08.303
(and earlier), this period is 15 minutes. With software
version C.OPT.05.09.303 (and later), this period is pro-
grammable over a range of 3 to 15 minutes using the
RAMP-UP TIME setpoint.
During the remainder of chiller run, the actuator is
modulated to maintain the programmed Level setpoint
(20 to 80%).This setpoint and others that affect this
operation are programmed by the Service Technician
on the REFRIGERANT LEVEL CONTROL screen. In
software version C.OPT.05.09.303 (and later), an off-
set is added to the Level Control setpoint during Low
Discharge Superheat events. This offset is displayed
on the REFRIGERANT LEVEL CONTROL screen as
REFRIGERANT LEVEL SETPOINT OFFSET. This
offset is calculated, over the range of 0% to (80% mi-
nus programmed Level setpoint), as follows:
• When the chiller is not running, the oset is 0%.
• The oset remains at 0% during the level control
valve preset and during the ramp after chiller start.
•When Discharge Superheat is less than 14ºF and
the Evaporator Pressure is more than 28.0 PSIG,
add 1% to the oset every 15 seconds, not to ex-
ceed the maximum oset.
•When Discharge Superheat more than 20ºF sub-
tract 1% from the oset every 15 seconds, not to
fall below the minimum oset.
The offset is added to the programmed Level Control
setpoint and is displayed as EFFECTIVE REFRIGER-
ANT LEVEL SETPOINT (over the range of 20% to
80%) on both the CONDENSER screen and the RE-
FRIGERANT LEVEL CONTROL screen. This is the
setpoint used to control the level control.
The Orifice can be manually operated from the key-
pad, using this screen. The Refrigerant Level Control
must be enabled by a Service Technician. A complete
description of the Refrigerant level Control operation
are contained in OptiView Control Center Service In-
structions (Form 160.81-M1).
An optional Hot Gas Bypass system allows the chiller
to remain running during extreme light load conditions
by diverting hot refrigerant gas directly from the Oil
Separator to the Evaporator, bypassing the Condenser.
A solenoid valve, located in the bypass line, is opened
and closed under Program control to turn the hot gas
ON and OFF. When the chiller is shutdown, the Hot
Gas Bypass is turned OFF. Each time the chiller is
started, it remains OFF for the first 3 minutes of chiller
operation. Thereafter, it is controlled per the differen-
tial between the Return Chilled Liquid Temperature
and the Leaving Chilled Liquid Temperature setpoint.
This differential is programmed as the Hot Gas ON and
Hot Gas OFF setpoints by a Service Technician. If the
chiller is equipped with the Hot Gas feature, operation
must be enabled by a Service Technician. A complete
description of the Hot Gas Bypass system is contained
in OptiView Control Center Service Instructions (Form
160.81-M1).
To prevent an overcurrent condition when starting the
compressor, the slide valve should be in the unloaded
position. While the unload signal is being applied,
“Slide Valve Unloading Before Shutdown” is dis-
played. To assist the slide valve in returning to the un-
loaded position, an unload signal is applied to it while
the compressor is still running prior to shutting down
on the following shutdowns:
• MULTIUNIT CYCLING - CONTACTS OPEN
• SYSTEM CYCLING - CONTACTS OPEN
• REMOTE STOP
• LEAVING CHILLED LIQUID - LOW
TEMPERATURE
• CONTROL PANEL - SCHEDULE
The duration of the unload signal applied depends on
the software version:

JOHNSON CONTROLS
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SECTION 1 - DESCRIPTION OF SYSTEM AND FUNDAMENTALS OF OPERATION
• With software version C.OPT.05.08.303 (and ear-
lier), it is 60 seconds.
• With software version C.OPT.05.09.303 (and later),
the duration is determined by the motor current
when the shutdown command is received as follows:
- 100% FLA or above equals 30 seconds.
- 75% FLA and below equals 5 seconds, lin-
ear between 75% and 100% FLA.
In multiple chiller applications it may be possible for
the chilled liquid (Water or Brine) from an operating
chiller to flow through the Evaporator of a standby
chiller. This represents a possible freeze threat to the
Condenser of the standby chiller. The Standby Chiller
Freeze Protection feature minimizes this freeze po-
tential by allowing the OptiView™ Control Center of
the standby chiller to cycle the condenser pump based
on the standby chiller’s Condenser Saturation Tem-
perature while it is shutdown. At chiller shutdown, the
pump runs until the condenser saturation temperature
increases to more than 35.0ºF, whereupon the pump is
turned OFF. While the chiller is shutdown, the condens-
er saturation temperature is monitored. If it decreases
to less than 30.0ºF, the pump is turned ON and runs un-
til the temperature increases to more than 35.0ºF. After
the chiller has been shutdown for at least the time delay
programmed as the Freeze time setpoint, and the tem-
perature decreases to less than 28.0ºF, “WARNING –
FREEZE THREAT FROM OPERATING CHILLER”
is displayed and alarm output is activated. When the
temperature increases to 28.0ºF, the warning message
and alarm output automatically clear. If this feature is
desired, Freeze Warning must be enabled by a Service
Technician. A complete description of this feature is
contained in the OptiView Control Center Service In-
structions (Form 160.81-M1).
Motor current overload protection is provided by the
CM-2 Board (Electro-Mechanical Starters) and Liq-
uid Cooled Solid State Starter. The overload is a timed
function beginning at 105% of the Chiller Full Load
Amps. With software version C.OPT.05.07.xxx (and
later), there is also a motor current overload provided
by the Microboard software. It also starts at 105% of
the chiller Full Load Amps and is adjustable over the
range of 12 (default) to 40 seconds with the 105% Mo-
tor Current Time setpoint. When the motor current has
exceeded 105% of Chiller FLA continuously for the
programmed time period, a safety shutdown is per-
formed and “105% Motor Current Overload” is dis-
played on the System Details Line of the Display.
The coolant temperature inside any JCI-supplied
liquid-cooled motor starter must be maintained
above the dewpoint temperature in the equipment
room to prevent condensing water vapor inside the
starter cabinet. Therefore, an additional temperature-
controlled throttle valve is needed in the flow path
for the starter heat exchanger to regulate cooling
above the equipment room dewpoint for applica-
tions using cooling sources other than evaporative
air-exchange methods, such as wells, bodies of wa-
ter, and chilled water. The temperature control valve
should be the type to open on increasing drive cool-
ant temperature, fail-closed, and set for a tempera-
ture above dewpoint. It can be requested as factory-
supplied on a chiller order by special quotation.

FORM 160.81-O1 (1020)
ISSUE DATE 10/05/2020
17
JOHNSON CONTROLS
SECTION 2 - OPTIVIEW™ CONTROL CENTER
2
SECTION 2 - OPTIVIEW™ CONTROL CENTER
INTRODUCTION
The YORK OptiView™ Control Center is a micropro-
cessor based control system for R134a screw chillers.
It controls the Leaving Chilled Liquid Temperature via
slide valve controls and has the ability to limit motor
current via control of the slide valve. Further, it is com-
patible with the YORK Solid State Starter (optional),
and Electro-Mechanical Starter applications.
The panel comes configured 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 specific operations are provided on
many of the screens.
The graphic display also allows information to be rep-
resented in both English (temperatures in °F and pres-
sures in PSIG) and Metric (temperatures in °C and pres-
sures 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 (Safe-
ty, 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 config-
ured 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 controls shown in this book
that are for Service Technician use only. They are only
displayed when logged in at SERVICE access level
or higher. The setpoints and parameters displayed on
these screens are explained in detail in OptiView Con-
trol Center Service Instructions (Form 160.81-M1).
These parameters aect chiller operation
and should never be modied by anyone
other than a qualied Service Techni-
cian. They are shown in this book for
reference only.
Advanced Diagnostics and Troubleshooting informa-
tion for Service Technicians are included in OptiView
Control Center Service Instructions (Form 160.81-
M1). Also included in the Service manual are detailed
descriptions of chiller features, such as the Refrigerant
Level Control, Hot Gas Bypass, Remote setpoints, and
Smart Freeze Protection.
The control center expands the capabilities of remote
control and communications. By providing a com-
mon networking protocol through the MicroGateway,
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 per-
formance monitoring via a remote site. In addition,
compatibility is maintained with the present network
FIGURE 3 - OPTIVIEW™ CONTROL CENTER
00565VIP

JOHNSON CONTROLS
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Optiview Control Center
of ISN 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 20mA or 4 to 20mA, 0
to 10VDC or 2 to 10VDC) or Pulse Width Modu-
lation.
4. Remote Current Limit setpoint adjustment (0 to
20mA or 4 to 20mA, 0 to 10VDC or 2 to 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
chillers until May 2004. The program resides in
a replaceable Flash Memory Card. The software
version (C.MLM.05.xx.yzz) is printed on label
adhered to card. Program can be upgraded by re-
placing the card.
• 031-02430-000 – shipped in new production
chillers after May 2004. The program resides in
non-removable onboard memory. The software
version is C.OPT.05.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.05.xx.yzz or C.OPT.05.
xx.yzz) are alpha-numeric codes that represent the ap-
plication, language package and revision levels per be-
low. Each time the controls portion or language 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
• 05 – YR chiller
• xx - Controls revision level (00, 01, etc)
• y – Language package (0 equals English only, 1
equals NEMA, 2 equals CE, 3 equals 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.05.xx.xxx). To
cross reference C.MLM software to C.OPT software,
refer to the controls revision level. Software version
C.OPT.05.05.xxx is of the same controls revision level
as C.MLM.05.05.xxx. From this starting point, both
receive the same updates at each revision. Software
upgrades should only be performed by a Service Tech-
nician.
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 redefined based on the currently dis-
played 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 key-
pad is used for data entry with a standard numeric key-
pad 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 en-
try 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 dis-
miss an entry form, the ‘X’key is provided as
a universal ‘Cancel’ symbol.
Cursor Arrow keys are provided to allow movement on
screens which contain a large amount of entry data. In
addition, these keys can be used to scroll through his-
tory and event logs.
START/STOP CONTROL
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 (O) position. When in
the middle position, this is considered the RUN state.

FORM 160.81-O1 (1020)
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SECTION 2 - OPTIVIEW™ CONTROL CENTER
2
When toggled to the left-most position, it is considered
in the START state. Each state is described in detail
below:
Stop / Reset (O)
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. In addi-
tion, the switch must be placed in this state following a
safety shutdown before the chiller is allowed to restart.
This guarantees that manual intervention has taken
place and the shutdown has been acknowledged.
Start (◄ )
The switch can only remain in this position when be-
ing 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 “Start Sequence Initi-
ated” cycle.
Run ( ■ )
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 following a
cycling shutdown. The switch must be in this state to
receive a valid remote start signal when operating un-
der a remote control source.
INTERFACE CONVENTIONS
Overview
The new graphical display on each control panel al-
lows 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 de-
scribe the graphical elements on the screen and give
a short summary of the functions available. Each ele-
ment 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 sub-screen.
Display Only
Values in this group are read-only parameters of in-
formation about the chiller operation. This type of in-
formation 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 operat-
ing 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 ren-
dered 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 first be logged in with the appropriate ac-
cess level. Each of the programmable values requires
a specific Access Level which will be indicated beside
the specified 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 first login with an appropriate access level.
When power is applied to the chiller, the system be-
gins with an Access Level of VIEW. This will allow
the user to navigate 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 applied to the system), and use
the Login button or utilize the Change Setpoints key de-
scribed 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 stan-
dard OPERATOR level access, the password would be
entered as 9 6 7 5, using the numeric keypad. OPERA-
TOR access reverts to the VIEW level after 10 continu-
ous minutes without a key press. If a custom User ID
and password have been defined (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 notified of the failure
and prompted again. At this point the user may retry
the password entry, or cancel the login attempt.

JOHNSON CONTROLS
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Optiview Control Center
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 with-
out 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 Leav-
ing 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 ap-
pears 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.
Leading zeroes are not necessary. If a decimal
point is necessary, press the ‘•’ key (i.e. 45.0).
3. Pressing the ▲ key, sets the entry value to the de-
fault for that setpoint. Pressing the ▼ key clears
the present entry. The ◄ key is a backspace key
and causes the entry point to move back one
space.
4. If the dialog box begins with “SELECT”, use the
◄ and ► keys to select the desired value.
5. If the previously dened setpoint is desired, press
the ‘X’ (Cancel) key to dismiss the dialog box.
6. Press the ‘√’ (Enter) key.
7. If the value is within range, it is accepted and the
dialog box disappears. The chiller will begin to
operate 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 slide 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 specific “soft”
key may not be assigned to each setpoint value. A soft
key will be assigned to enable the cursor arrow keys be-
low the numeric keypad which are used to “highlight”
the desired setpoint field. At this point, the ‘√’ key is
pressed to bring up a dialog prompting the user to en-
ter a new setpoint value. The ‘X’ key cancels Cursor
mode. (See the SCHEDULE screen for an example.)