York MAXE OPTIVIEW YK Operating instructions

SERVICE INSTRUCTIONS
MAXETM
CENTRIFUGAL LIQUID CHILLERS
Supersedes: 160.54-M1 (402) Form 160.54-M1 (503)
m
Metric Conversions
371-02264-101 (Electro-Mechanical Starter - NEMA 1)
371-02486-101 (Electro-Mechanical Starter - CE)
371-02448-101 (Electro-Mechanical Starter - NEMA 4/12)
371-02264-102 (Solid State Starter - NEMA 1)
371-02486-102 (Solid State Starter - CE)
371-02448-102 (Solid State Starter - NEMA 4/12)
371-02264-103 (Variable Speed Drive - NEMA 1)
371-02486-103 (Variable Speed Drive - CE)
371-02448-103 (Variable Speed Drive - NEMA 4/12)
371-02778-101 (Electro-Mechanical Starter - NEMA 1)
(P Compressors until 8/02)
371-02780-101 (Electro-Mechanical Starter - CE)
(P Compressors until 8/02)
371-02779-101 (Electro-Mechanical Starter - NEMA 4/12)
(P Compressors until 8/02)
371-02778-102 (MOD “B” Solid State Starter - NEMA 1)
(P Compressors until 8/02)
371-02780-102 (MOD “B” Solid State Starter - CE)
(P Compressors until 8/02)
371-02779-102 (MOD “B” Solid State Starter - NEMA 4/12)
(P Compressors until 8/02)
MODEL YK (THROUGH STYLE F)
371-02778-103 (Variable Speed Drive - NEMA 1-4)
(P Compressors until 8/02)
371-02780-103 (Variable Speed Drive - CE)
(P Compressors until 8/02)
371-02779-103 (Variable Speed Drive - NEMA 4/12)
(P Compressors until 8/02)
371-04118-101 (Electro-Mechanical Starter – NEMA 1)
(Style F Chillers)
371-04118-102 (Style B Solid State Starter – NEMA 1)
(Style F Chillers)
371-04118-103 (Variable Speed Drive – NEMA 1)
(Style F Chillers)
371-04119-101 (Electro-Mechanical Starter – NEMA 4/12)
(Style F Chillers)
371-04119-102 (Mod “B” Solid State Starter - NEMA 4/12)
(Style F Chillers)
371-04119-103 (Variable Speed Drive – NEMA 4/12)
(Style F Chillers)
371-04120-101 (Electro-mechanical Starter – CE)
(Style F Chillers)
371-04120-102 (Mod “B” Solid State Starter – CE)
(Style F Chillers)
371-04120-103 (Variable Speed Drive – CE)
(Style F Chillers)
OPTIVIEW™ CONTROL CENTER
00614VIP

YORK INTERNATIONAL
2
FORM 160.54-M1(503)
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 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 under-
stood this document and any referenced materials. This
individual shall also be familiar with and comply with
all applicable governmental standards and regulations
pertaining to the task in question.
SAFETY SYMBOLS
The following symbols are used in this document to alert the reader to areas of potential hazard:
WARNING indicates a potentially
hazardous situation which, if not
avoided, could result in death or se-
rious injury.
DANGER indicates an imminently
hazardous 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
environmental pollution. Usually an
instruction will be given, together with
a brief explanation.
External wiring, unless specified 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 wir-
ing is allowed to be run through the micro panel. All wiring must be in accordance with
YORK’s published specifications and must be performed ONLY by qualified YORK personnel.
YORK 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
information which may be helpful to
you.

FORM 160.54-M1(503)
3
YORK INTERNATIONAL
CHANGEABILITY OF THIS DOCUMENT
In complying with YORK’s policy for continuous
product improvement, the information contained in
this document is subject to change without notice.
While YORK makes no commitment to update or
provide current information automatically to the
manual owner, that information, if applicable, can
be obtained by contacting the nearest YORK Applied
Systems Service office.
It is the responsibility of operating/service personnel
as to the applicability of these documents to the equip-
ment in question. If there is any question in the mind
of operating/service personnel as to the applicability of
these documents, then, prior to working on the equip-
ment, they should verify with the owner whether the
equipment has been modified and if current literature
is available.
REFERENCE INSTRUCTIONS
NOMENCLATURE
STYLE (DESIGN LEVEL)
POWER SUPPLY
– for 60 Hz
5 for 50 Hz
COMPRESSOR CODE
G4, H0, H1, H2, H3, H4, H5, H6
H8, J1, J2, J3, J4, P1, P2, P3, P4
CONDENSER CODE
CB, CC, CD, DB, DC, DD, EB, EC, ED
FB, FC, FD, GB, GC, GD, HB, HC, HD, JB, JC,
JD, TB, TC, TD, VB, VC, VD
COOLER CODE
CB, CC, CD, CE, DB, DC, DD, DE, FB, FC, FD
GB, GC, GD, GF, GH, HB, HC, HF, HH, JF, JG
MODEL JH, TF, TG, TH, VF, VH, WF, WH
YK CB CB G4 – CM F
MOTOR CODE
60 Hz 50 Hz
CH CX 5CE 5CT
CJ CY 5CF 5CU
CK CZ 5CG 5CV
CL CA 5CH 5CW
CM CB 5CI 5CX
CN DA 5CJ 5DA
CP DB 5CK 5DB
CR DC 5CL 5DC
CS DD 5CM 5DD
CT DE 5CN 5DE
CU DF 5CO 5DF
CV DH 5CP 5DG
CW DJ 5CQ 5DH
5CR 5OJ
5CS
DESCRIPTION FORM NO.
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
VARIABLE SPEED DRIVE – SERVICE INSTRUCTIONS 160.00-M1
VARIABLE SPEED OIL PUMP DRIVE 160.52-M2
INSTALLATION 160.54-N1
OPERATION 160.54-O1
WIRING DIAGRAM – UNIT (STYLE E) WITH ELECTRO-MECHANICAL STARTER 160.54-PW1
WIRING DIAGRAM – UNIT (STYLE E) WITH MOD “A” SOLID STATE STARTER 160.54-PW2
WIRING DIAGRAM – UNIT (STYLE E) WITH MOD “B” SOLID STATE STARTER 160.54-PW2.1
WIRING DIAGRAM – UNIT (STYLE E) WITH VARIABLE SPEED DRIVE 160.54-PW3
WIRING DIAGRAM – UNIT (STYLE E) (P COMPRESSORS) WITH ELECTRO-MECHANICAL STARTER 160.54-PW8
WIRING DIAGRAM – UNIT (STYLE E) (P COMPRESSORS) WITH MOD “B” SOLID STATE STARTER 160.54-PW9
WIRING DIAGRAM – UNIT (STYLE E) (P COMPRESSORS) VARIABLE SPEED DRIVE 160.54-PW10
RENEWAL PARTS – UNIT 160.49-RP4
RENEWAL PARTS – OPTIVIEW CONTROL CENTER 160.54-RP1
WIRING DIAGRAM – UNIT (STYLE F) (ALL COMPRESSORS) WITH ELECTRO-MECHANICAL STARTER 160.73-PW1
WIRING DIAGRAM – UNIT (STYLE F) (ALL COMPRESSORS) WITH MOD “A” SOLID STATE STARTER 160.73-PW1
WIRING DIAGRAM – UNIT (STYLE F) (ALL COMPRESSORS) WITH VARIABLE SPEED DRIVE 160.73-PW3

YORK INTERNATIONAL
4
FORM 160.54-M1(503)
TABLE OF CONTENTS
SECTION 1 - INTRODUCTION......................................................................................................... 8
SECTION 2 - SYSTEM ARCHITECTURE....................................................................................... 10
SECTION 3 - MICROBOARD.......................................................................................................... 19
SECTION 4 - I/O BOARD................................................................................................................ 37
SECTION 5 - LIQUID CRYSTAL DISPLAY ..................................................................................... 45
SECTION 6 - DISPLAY INTERFACE BOARD ................................................................................ 54
SECTION 7 - DISPLAY BACKLIGHT INVERTER BOARD ............................................................. 56
SECTION 8 - KEYPAD .................................................................................................................... 59
SECTION 9 - POWER SUPPLY...................................................................................................... 62
SECTION 10 - CURRENT MODULE (CM-2) .................................................................................. 64
SECTION 11 - SOLID STATE STARTERS...................................................................................... 68
SECTION 12 - ADAPTIVE CAPACITY CONTROL BOARD............................................................ 75
SECTION 13 - PROXIMITY PROBE ............................................................................................... 84
SECTION 13A - HIGH SPEED THRUST BEARING LIMIT SWITCH.............................................. 89
SECTION 14 - REFRIGERANT LEVEL CONTROL........................................................................ 91
SECTION 15 - OIL PUMP VARIABLE SPEED DRIVE.................................................................... 95
SECTION 16 - MICROGATEWAY ................................................................................................... 99
SECTION 17 - PRESSURE TRANSDUCERS .............................................................................. 100
SECTION 18 - TEMPERATURE THERMISTORS ........................................................................ 102
SECTION 19 - REMOTE SETPOINTS.......................................................................................... 120
SECTION 20 - HOT GAS BYPASS ............................................................................................... 125
SECTION 21 - SMART FREEZE PROTECTION .......................................................................... 129
SECTION 22 - SURGE PROTECTION ...................................................................................... 131
SECTION 23 - SYSTEM CALIBRATION....................................................................................... 133
Electro-Mechanical Starter Applications.................................................................................... 133
Solid State Starter Applications ................................................................................................. 134
Mod “B” Serial Data Interface Liquid Cooled Solid State Starter............................................... 134
Mod “A” Multiplexed Data Interface Liquid Cooled Solid State Starter...................................... 135
Compressor Motor Variable Speed Drive .................................................................................. 136
Pre-Rotation Vanes Position Potentiometer: ............................................................................. 137
Proximity Probe ......................................................................................................................... 138
Safety Shutdown Reset/Inspection Procedure: ........................................................................ 139
High Speed Thrust Bearing Limit Switch ................................................................................... 140
Refrigerant Level Control .......................................................................................................... 140
Oil Pump Variable Speed Drive ................................................................................................. 142
Standby Lubrication................................................................................................................... 142
High Condenser Pressure Warning Threshold.......................................................................... 143
Brine Low Evaporator Pressure Cutout ..................................................................................... 143
Leaving Chilled Liquid Temperature Control Sensitivity ............................................................ 143
Drop Leg Refrigerant Temperature............................................................................................ 144
Smart Freeze Protection ........................................................................................................... 144
Evaporator Refrigerant Temperature ......................................................................................... 144
Hot Gas Bypass Control ............................................................................................................ 144
Chiller Starts and Operating Hours Reset ................................................................................. 145
Service Phone Numbers ........................................................................................................... 146
Surge Protection........................................................................................................................ 146

FORM 160.54-M1(503)
5
YORK INTERNATIONAL
Sales Order Data....................................................................................................................... 146
Custon User ID and Passwords ................................................................................................ 147
Record Setpoint Changes ......................................................................................................... 148
Chiller Style/Compressor .......................................................................................................... 149
Flow Switch ............................................................................................................................. 151
SECTION 24 - DIAGNOSTICS & TROUBLESHOOTING ............................................................ 152
Main Diagnostics Screen........................................................................................................... 153
Keypad Test............................................................................................................................... 154
Display Test ............................................................................................................................... 155
Serial Inputs / Outputs Test ....................................................................................................... 157
Digital Iinputs / Outputs Test...................................................................................................... 159
Anallog Inputs Test .................................................................................................................... 162
SECTION 25 - SYSTEM COMMISSIONING CHECKLIST........................................................... 165
SECTION 26 - SERVICE INFORMATION LETTERS / BULLETINS............................................ 168
SI0006 - Software Enhancements Effective May 2001 ............................................................. 168
SI0019 - Software Enhancements Effective March 2002 .......................................................... 170
SI0034 (203) - Software Enhancements Effective AUGUST 2002........................................... 174
SI0058 - Software Enhancements Effective February 2003...................................................... 178
SI0062 - Software Enhancements Effective March 2003 .......................................................... 180

YORK INTERNATIONAL
6
FORM 160.54-M1(503)
LIST OF FIGURES
FIG. 1 – OPTIVIEW CONTROL CENTER - ELECTRO-MECHANICAL
STARTER APPLICATIONS .............................................................................................. 13
FIG. 2 – OPTIVIEW CONTROL CENTER - MOD “A” SOLID STATE STARTER APPLICATIONS . 14
FIG. 3 – OPTIVIEW CONTROL CENTER - MOD “B” SOLID STATE STARTER APPLICATIONS . 15
FIG. 4 – OptiView CONTROL CENTER - COMPRESSOR MOTOR VARIABLE SPEED DRIVE... 16
FIG. 5 – OPERATION SEQUENCE TIMING DIAGRAM
(ELECTRO-MECHANICAL & SOLID STATE STARTER APPLICATIONS) ....................... 17
FIG. 6 – OPERATION SEQUENCE TIMING DIAGRAM
(COMPRESSOR MOTOR VARIABLE SPEED DRIVE APPLICATIONS) ......................... 18
FIG. 7 – MICROBOARD.................................................................................................................. 28
FIG. 8 – FLASH MEMORY CARD................................................................................................... 29
FIG. 9 – MICROBOARD.................................................................................................................. 30
FIG. 10 – MICROBOARD LAMP DIMMER CIRCUIT...................................................................... 34
FIG. 11 – MICROBOARD SERIAL DATA COMMUNICATIONS PORTS......................................... 35
FIG. 12 – CONFIGURABLE ANALOG & REMOTE SETPOINT INPUTS ....................................... 36
FIG. 13 – I/O BOARD ..................................................................................................................... 39
FIG. 14 – I/O BOARD DIGITAL INPUTS ......................................................................................... 40
FIG. 15 – I/O BOARD TYPICAL OPTO-COUPLER CIRCUIT......................................................... 41
FIG. 16 – I/O BOARD TYPICAL FIELD CONNECTIONS ............................................................... 41
FIG. 17 – I/O BOARD DIGITAL OUTPUTS ..................................................................................... 42
FIG. 18 – DISPLAY, MOUNTING .................................................................................................... 48
FIG. 19 – LIQUID CRYSTAL DISPLAY ASSEMBLY – SHARP LQ10D367 DISPLAY ..................... 49
FIG. 20 – LIQUID CRYSTAL DISPLAY ASSEMBLY – SHARP LQ10D421 DISPLAY ..................... 49
FIG. 21 – LIQUID CRYSTAL DISPLAY ASSEMBLY – NEC NL6448AC33-24 DISPLAY ................ 50
FIG. 22 – LIQUID CRYSTAL DISPLAY ASSEMBLY - LG SEMICON LP104V2-W ......................... 51
FIG. 23 – LIQUID CRYSTAL DISPLAY TYPICAL CONTROL SIGNAL TIMING.............................. 51
FIG. 24 – DISPLAY (SHARP LQ10D367) LAMP REPLACEMENT................................................. 52
FIG. 25 – DISPLAY (SHARP LQ10D421) LAMP REPLACEMENT................................................. 52
FIG. 26 – DISPLAY (NEC NL6448AC33-24) LAMP REPLACEMENT ............................................ 53
FIG. 27 – DISPLAY (LG SEMICON LP104V2-W) LAMP REPLACEMENT..................................... 53
FIG. 28 – DISPLAY INTERFACE BOARD....................................................................................... 55
FIG. 29 – DISPLAY BACKLIGHT INVERTER BOARD .................................................................. 57
FIG. 30 – DISPLAY BACKLIGHT INVERTER BOARD .................................................................. 58
FIG. 31 – DISPLAY BACKLIGHT INVERTER BOARD .................................................................. 58
FIG. 32 – KEYPAD .......................................................................................................................... 60
FIG. 33 – KEYPAD .......................................................................................................................... 61
FIG. 34 – POWER SUPPLY ............................................................................................................ 62
FIG. 35 – POWER SUPPLY – DC POWER DISTRIBUTION
(REFER TO OPTIVIEW CONTROL CENTER WIRING DIAGRAM
FOR WIRE CONNECTIONS).......................................................................................... 63
FIG. 36 – CM-2 CURRENT MODULE (ELECTRO-MECHANICAL STARTER APPLICATION) ...... 66
FIG. 37 – CM-2 CURRENT MODULE (ELECTRO-MECHANICAL STARTER APPLICATIONS).... 66
FIG. 38 – CM-2 CURRENT MODULE – INTERFACE, CURRENT TRANSFORMERS &
VARIABLE RESISTORS ................................................................................................. 67
FIG. 39 – MOD “B” LIQUID COOLED SOLID STATE STARTER (LCSSS) - INTERFACE ............. 70
FIG. 40 – SOLID STATE STARTER LOGIC BOARD ...................................................................... 71
FIG. 41 – MOD “A” LIQUID COOLED SOLID STATE STARTER (LCSSS) - INTERFACE ............. 74

FORM 160.54-M1(503)
7
YORK INTERNATIONAL
FIG. 42 – COMPRESSOR MOTOR VARIABLE SPEED DRIVE
(VSD) ADAPTIVE CAPACITY CONTROL (ACC) BOARD .............................................. 81
FIG. 43 – ADAPTIVE CAPACITY CONTROL (ACC) BOARD - INTERFACE ................................. 82
FIG. 44 – ADAPTIVE CAPACITY CONTROL (ACC) BOARD ......................................................... 83
FIG. 45 – PROXIMITY PROBE - INTERFACE PROBE ................................................................. 86
FIG. 46 – PROXIMITY PROBE - INTERFACE PROBE .................................................................. 86
FIG. 47 – PROXIMITY PROBE - INTERFACE PROBE .................................................................. 87
FIG. 48 – PROXIMITY PROBE .......................................................................................................88
FIG. 49 – HIGH SPEED THRUST BEARING LIMIT SWITCH - INTERFACE ................................. 89
FIG. 50 – HIGH SPEED THRUST BEARING LIMIT SWITCH ........................................................ 90
FIG. 51 – REFRIGERANT LIQUID LEVEL SENSOR ..................................................................... 93
FIG. 52 – REFRIGERANT LIQUID LEVEL CONTROL - INTERFACE ........................................... 94
FIG. 53 – OIL PUMP VARIABLE SPEED DRIVE (VSD) ................................................................. 97
FIG. 54 – OIL PUMP VSD / OIL HEATER CONTROL – INTERFACE ............................................ 98
FIG. 55 – OIL PUMP VSD SPEED CONTROL SIGNAL ................................................................. 98
FIG. 56 – MICROGATEWAY INTERFACE BLOCK DIAGRAM ....................................................... 99
FIG. 57 – PRESSURE TRANSDUCERS ...................................................................................... 101
FIG. 58 – LEAVING CHILLED LIQUID TEMPERATURE .............................................................. 103
FIG. 59 – RETURN CHILLED LIQUID TEMPERATURE ............................................................. 108
FIG. 60 – RETURN AND LEAVING CONDENSING WATER......................................................... 111
FIG. 61 – OIL AND DISCHARGE TEMPERATURE......................................................................114
FIG. 62 – DROP LEG REFRIGERANT SENSOR ........................................................................119
FIG. 63 – EVAPORATOR REFRIGERANT SENSOR...................................................................119
FIG. 64 – INTERFACE, HOT GAS BYPASS ................................................................................. 128
FIG. 65 – MAIN DIAGNOSTICS SCREEN.................................................................................... 153
FIG. 66 – KEYPAD TEST SCREEN .............................................................................................. 154
FIG. 67 – DISPLAY TEST MAIN SCREEN.................................................................................... 155
FIG. 68 – BIT PATTERNS TEST SCREEN ................................................................................... 156
FIG. 69 – SERIAL INPUTS / OUTPUTS TEST SCREEN ............................................................. 157
FIG. 70 – MICROBOARD - COM 5 SERIAL DATA PORT............................................................. 158
FIG. 71 – DIGITAL INPUTS / OUTPUTS TEST SCREEN ............................................................ 159
FIG. 72 – ANALOG INPUTS TEST SCREEN ............................................................................... 162

YORK INTERNATIONAL
8
FORM 160.54-M1(503)
This document explains the operation of the printed circuit
boards and major components of the OptiView Control
Center to a level that allows a Service Technician to trou-
bleshoot and locate the source of a problem.
The overall system architecture is described and illus-
trated with block diagrams. This describes the general
function of each component and provides the system in-
terface and signal flow. The function of each component
and signal flow between components must be understood
before effective troubleshooting can commence.
The operation of each printed circuit board is described
and illustrated with a block diagram that is a simplified
representation of board circuitry. The expected voltage
level at all inputs and outputs of each board for any
operating condition is provided.
Included in this document are procedures that have to
be performed at chiller commissioning or during ser-
vice. They should not be performed by anyone other
than a Service Technician. For example, calibration
procedures have to be performed or verified at system
commissioning or when a component is replaced. Cer-
tain Safety shutdowns require special reset procedures
to be performed before the chiller can be restarted.
Since the operating program supplied in each OptiView
Control Center is universal to all applications, special
setpoints, program jumpers and program switches are
required to configure the chiller for local operating
conditions.
A System Commissioning Checklist is provided as reference
of items to be performed during chiller commissioning.
Chillers that are equipped with “P” Compressors have
certain component variances. These variances are noted
in the appropriate sections of this book.
SECTION 1
INTRODUCTION
In addition to this document, several levels of supporting
documentation are required while servicing the system.
Field Control Modifications Diagram 160.54-PW7 pro-
vides details of the interface to remote devices. Operations
Manual 160.54-O1 explains the operation of the OptiView
Control Center Keypad, how to enter Setpoints and ex-
plains all the messages displayed on the OptiView Control
Center display. The following wiring diagrams provide
the connections between the printed circuit boards and
components within the OptiView Control Center:
Chillers Through Style E
(Except "P" Compressors):
• YORK Form 160.54-PW1 – Chillers equipped with
Electro-Mechanical starter
• YORK Form 160.54-PW2 – Chillers equipped with
Mod “A” YORK Solid State Starter
• YORK Form 160.54-PW2.1 – Chillers equipped
with Mod “B” YORK Solid State Starter
• YORK Form 160.54-PW3 – Chillers equipped with
YORK Variable Speed Drive
Chillers Through Style E
("P" Compressors):
• YORK Form 160.54-PW8 – Chillers (“P” Compres-
sors) equipped with Electro-Mechanical Starter
• YORK Form 160.54-PW9 – Chillers (“P” Compressors)
equipped with Mod “B” YORK Solid State Starter
• YORK Form 160.54-PW10 – Chillers (“P” Com-
pressors) equipped with YORK Variable Speed
Drive
Style F Chillers
(All Compressors):
• YORK Form 160.73-PW1 – (Electro-Mechanical
Starter)
• YORK Form 160.73-PW2 – (Mod “B” YORK Solid
State Starter)
• YORK Form 160.73-PW3 – (Variable Speed
Drive)
Introduction

FORM 160.54-M1(503)
9
YORK INTERNATIONAL
1
When the chiller shuts down on a SAFETY or CY-
CLING shutdown or is being prevented from starting,
a message is displayed providing the reason for the shut-
down. This message, along with all the chiller operating
conditions at the instant of the event are stored in the
Microboard battery-backed memory. This history data
can be displayed or printed using an optional printer.
The Operations Manual 160.54-O1 provides a detailed
description of this message, including the conditions
required to produce the message and conditions required
to restart the chiller.
Diagnostic Routines allow service analysis of the fol-
lowing functions:
• Display
• Analog inputs
• Digital inputs
• Digital outputs
• Serial Data ports
Before beginning any troubleshooting, observe the shut-
down message and retrieve the HISTORY data of that
event. Refer to the Operations Manual for an explanation
of the message. The conditions required to produce the
message must be clearly understood before proceeding.
(If this is not heeded, much time will be wasted). Armed
with a knowledge of the overall system architecture and
the function of each printed circuit board and signal flow
provided by this manual, proceed with the appropri-
ate Wiring Diagram listed above to trace the problem
through the system. Use the Diagnostic Routines where
appropriate.

YORK INTERNATIONAL
10
FORM 160.54-M1(503)
System Architecture
SECTION 2
SYSTEM ARCHITECTURE
The OptiView Control Center performs the following
functions:
• Controls chiller capacity to chill liquid to the chilled
liquid temperature setpoint.
• Controls chiller solenoid valves, relays, actuators
and motor contactors per the operating program.
• Displays chiller operating conditions, alarms, shut-
down messages and history data.
• Accepts operator-programmed setpoints and con-
trols the chiller accordingly.
• Allows manual control of chiller motor contactors
and actuators.
• Monitors chiller operating conditions and shuts
down chiller when Safety or Cycling thresholds
are exceeded.
• Allows local manual start/stop and accepts start/
stop commands from remote devices, via contact
closures or serial communications.
• Allows setpoints to be changed from a remote lo-
cation via 0-10VDC, 2-10VDC, 0-20mA, 4-20mA,
contact closures or serial communications.
• Provides chiller operating data and status to remote
devices via serial communications and contact
closures.
• Allows real-time data and history data to be printed
on an optional printer.
• Controls the compressor motor starter and contains
a printed circuit board logic that supports Electro-
Mechanical Starters, Solid State Starters and YORK
Variable Speed Drive.
The OptiView Control Center is a microprocessor
based control system that receives analog, digital and
serial data inputs and controls analog, digital and serial
data outputs per instructions in the operating program.
A panel mounted display and touch-sensitive keypad
permit local operation.
System pressures are sensed by pressure transducers
The output of each transducer is a DC voltage that is
analogous to the pressure input. System temperatures are
sensed by thermistors. The output of each thermistor
is a DC voltage that is analogous to the temperature it
is sensing. Typical output voltage range of both is 0.5
to 4.5VDC. These are analog inputs to the OptiView
Control Center.
Digital Inputs are on/off inputs to the OptiView Control
Center in the form of switch and relay contacts. These
inputs are 115VAC when the contacts are closed and
0VAC when open. These include flow switches, local
start/stop switch, remote cycling and high pressure
safety device, etc.
Digital Outputs are on/off outputs from the OptiView
Control Center in the form of relay contacts and triacs.
The relay contacts typically switch 115VAC and the
triacs typically switch a nominal 30VAC. Relay outputs
include status/alarm, chiller solenoid valves, oil heater,
oil pump starter and chilled and condenser water pump
starters, etc. Triac outputs include pre-rotation vane
control and variable orifice control.
Serial Data is transmitted to and received from devices
in RS-232, RS-485 and TX/RX (opto-couple) form.
The OptiView Control Center supports three types of
starters; Electro-Mechanical Starter, Solid State Starter
and Variable Speed Drive. However, all OptiView Con-
trol Centers contain the following standard components,
regardless of the starter type applied:
• Microboard
• I/O (input/output) Board
• Keypad
• Display
• Power Supply
In addition to the standard components, the OptiView
Control Center contains a printed circuit board that
provides certain control and interface functions for the
starter type applied. Each starter type requires a different
board as follows:
• Electro-Mechanical Starter - CM-2 Current Mod-
ule
• Solid State Starter (Mod “A” only) - Logic Board
• Variable Speed Drive - Adaptive Capacity Control
Board
Figures 1 through 4 are OptiView Control Center block
diagrams of the three starter types. On each block di-
agram, the standard components are shown, along with
the printed circuit board that supports the applied starter
type. Figures 5 and 6 are Operation Sequence timing
diagrams of the different starter applications.