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.

FORM 160.54-M1(503)
11
YORK INTERNATIONAL
2
The microprocessor and all supporting logic circuits, along
with the memory devices containing the operating program,
reside on the Microboard.All chiller operating decisions
are made here. It receives analog and digital inputs from
the chiller and remote devices. The analog inputs are
connected directly to the Microboard. The digital inputs
are received via the I/O Board (see description below).
Under Program control, the Microboard operates the
relays and triacs that are located on the I/O Board.
The I/O Board acts as an input/output device for the
Microboard. It conditions the digital input signals for
the Microboard and contains relays and triacs that are
controlled by the Microboard to control solenoids,
motor contactors and actuators. The 115VAC digital
inputs from switch and relay contacts are converted to
logic level voltages by Opto-Couplers. The relays have
+12VDC coils that are energized and de-energized by
the Microboard. The contacts of these relays control the
115VAC system solenoids, relays and motor contactors.
The triacs are turned on and off by the Microboard. The
outputs of these triacs control actuators.
A front panel-mounted Keypad allows Operator and
Service Technician user interface. Membrane keys are
used to display chiller and system parameters, enter
setpoints and perform chiller and OptiView Control
Center diagnostics. It also contains a START-RUN-
STOP/RESET Switch that is used to locally start and
stop the chiller and perform manual reset functions.
A front panel mounted liquid crystal Display allows
graphic animated display of the chiller, chiller subsys-
tems and system parameters. The chiller and working
components of the chiller are displayed, along with
chiller operating pressures and temperatures. The Key-
pad is used to select displays showing increasing levels
of detail of chiller working components.
A self-contained Power Supply supplies the necessary
DC voltages for all the components within the OptiView
Control Center.
Chillers equipped with “P” compressors and all style
“F” and later chillers have a different Condenser High
Pressure Safety Cutout Switch (HPCO) than supplied on
other compressor applications. This switch is mounted
on the condenser shell but has a different wiring in-
terface to the I/O Board and Motor Controller circuit.
Refer to the I/O Board section of this book. Also, “P”
compressor applications and style “F” and later chillers
with “G” and “H5-8” compressors are equipped with a
High Speed Thrust Bearing Limit Switch instead of the
Proximity Probe supplied on other compressors. This
device detects abnormal bearing position through probe
contact instead of distance measurement as performed
with the Proximity Probe.
Style C and earlier chillers are equipped with fixed speed
oil pumps. Style D and later chillers are equipped with
Variable Speed Oil Pumps.
Style F (and later) chillers require Flash Memory card
version C.MLM.01.07.xxx and later and are supplied
with factory-mounted Flow Sensors on the evapora-
tor and condenser. These are electronic thermal-type
sensors. The operating principle of the sensor is thermal
conductivity. It uses the cooling effect of a flowing liq-
uid to sense flow. The temperature of the heated sensor
tip is sensed by a thermistor located in the tip. A second
thermistor, located higher in the tip in a non-heated area,
is only affected by changes in liquid temperature. The
temperatures sensed by the thermistors are compared.
Flowing liquid carries heat away from the heated sensor
tip, lowering its temperature. The lower temperature dif-
ferential between the two thermistors indicates the liquid
is flowing. A higher differential indicates no flow. These
sensors are interfaced to Microboard analog inputs. Re-
fer to the SECTION 3 for a detailed explanation of this
flow sensor and interface.
If equipped with Flash Memory Card version
C.MLM.01.07.xxx (and later), the chiller Style/Com-
pressor combination must be entered using the Chiller
Style/Compressor Setpoint (refer to SECTION 23).
Once the applicable chiller style/compressor combina-
tion is entered, the program automatically bundles the
functionality and chiller control per the entered chiller
style/compressor requirements. The various chiller
style/compressor combinations are equipped differently
and have different control requirements. The variables
include:
• High Speed Thrust bearing proximity sensing
– Proximity Probe or Limit Switch

YORK INTERNATIONAL
12
FORM 160.54-M1(503)
System Architecture
• Flow Sensor – Paddle type or Factory Mounted
Thermal Type. The paddle type applies 115Vac to
the I/O Board Digital inputs TB4-12 (evaporator)
and TB4-11 (condenser) (refer to fig 14). The fac-
tory mounted Thermal type (available with Style F
and later chillers), applies +5Vdc to the microboard
Analog inputs at J7-14 (evaporator) and J7-16
(condenser)(refer to fig 12). Flash Memory Card
version C.MLM.01.07.xxx and C.MLM.01.07A.xxx
automatically selects the Flow Sensor input, either
digital or analog per the Chiller Style/Compressor
Setpoint selection. Flash Memory Card version
C.MLM.01.08.xxx and later allows use of either
the Thermal-type or the Paddle-type flow sensors
on style F and later chillers. With these versions,
the actual flow sensor type present must be entered
using the Flow Switch Setpoint (refer to SECTION
23).
• Oil Heater Outputs – Either TB1-34 or TB1-64 on
I/O Board
• Refrigerant Level Control Default Period – Either
3.5 seconds or 10.0 seconds
• “Oil – Variable Speed Pump-Pressure Setpoint Not
Achieved” safety shutdown threshold – Either 25
PSID or 35 PSID
When the compressor motor is driven by an Electro-
Mechanical Starter, the OptiView Control center is
equipped with a CM-2 Current Module. This printed
circuit board provides current overload and power fault
protection for the compressor motor. Current Trans-
formers, located in the compressor motor terminal box,
along with rectifying and calibration circuitry, provide
an analog voltage representing compressor motor current
to the CM-2 Module. This signal is further conditioned
and provided to the Microboard.
When the compressor motor is driven by a YORK Solid
State Starter, there could be either of two different Solid
Starters applied. Later production chillers are equipped
with the Mod “B” Solid State Starter. This starter con-
tains a combination Logic/Trigger Board that interfaces
the Microboard via a serial communications link. Earlier
vintage chillers are equipped with the Mod “A” Solid
State Starter. This starter contains a Trigger Board that
interfaces to a Logic Board that is installed inside the
OptiView Control Center. The Logic Board interfaces
the Microboard via a multiplexed data interface.
When the compressor motor is driven by the YORK
Variable Speed Drive (VSD), the OptiView Control
Center is equipped with an Adaptive Capacity Con-
trol Board. This printed circuit board monitors system
parameters and controls the VSD to drive the compressor
at the slowest speed it will operate without surging, while
maintaining required chiller capacity.
Serial data interface to the YORK ISN Building Auto-
mation System is through the optional MicroGateway.
This printed circuit board requests the required data
from the Microboard and makes it available for the
ISN network.

FORM 160.54-M1(503)
13
YORK INTERNATIONAL
FIG. 1 – OPTIVIEW CONTROL CENTER - ELECTRO-MECHANICAL STARTER APPLICATIONS LD09036
2
POWER
SUPPLY
DIGITAL
IN
MICROBOARD
I / O BOARD
TRIAC
OUT
RELAY
OUT
KEYPAD
DISPLAY
INTERFACE
BOARD
LIQUID
CRYSTAL
DISPLAY
LAMP BACKLIGHT
INVERTER
BOARD
LAMP
CONTROL
ROW IN
COLUMN OUT
DISPLAY DATA
VANE MOTOR SWITCH
REMOTE CYCLING
HIGH PRESSURE SAFETY
LOCAL START / STOP SWITCH
CHILLED & CONDENSER WATER FLOW SWITCHES (STYLE "E" AND
EARLIER CHILLERS; OPTIONAL STYLE F AND LATER CHILLERS WITH
FLASH MEMORY CARD VERSION C.MLM.01.08.XXX OR LATER VERSIONS)
OIL PUMP VSD CYCLING STATUS
MOTOR CONTROLLER SHUTDOWN
REMOTE LEAVING CHILLED WATER TEMP & CURRENT
LIMIT SETPOINTS (CONTACT CLOSURE)
HIGH SPEED THRUST BEARING LIMIT SWITCH ("P" COMPRESSORS AND
STYLE "F" AND LATER CHILLERS WITH "G" AND "H5-8" COMPRESSORS)
VARIABLE ORIFICE CONTROL
PRE-ROTATION VANE CONTROL
STATUS / ALARM CHILLER SOLENOID VALVES OIL PUMP STARTER OIL HEATER ON/OFF CHILLED & CONDENSER WATER PUMP STARTERS
COMPRESSOR
MOTOR START
TO STARTER
MOTOR CONTROLLER SHUTDOWN TO I/O BOARD
MULTIPLEXED DATA
ADDRESS
CM-2
CURRENT
MODULE
COMPRESSOR MOTOR CURRENT
+ 24 VDC
+12 / -12 / +5 VDC
OIL PUMP VSD SPEED CONTROL
RS-232 / RS-485 SERIAL DATA
FACTORY-MOUNTED CHILLED AND CONDENSER LIQUID THERMAL-TYPE
FLOW SENSORS (STYLE "F" AND LATER CHILLERS)
CHILLER TEMPERATURES & PRESSURES
CONDENSER REFRIGERANT LEVEL
HIGH SPEED THRUST BEARING POSITION (NOT APPLICABLE TO "P" COMPRESSORS
AND STYLE "F" AND LATER CHILLERS WITH "G" AND "H5-8" COMPRESSORS)
REMOTE LEAVING CHILLED WATER TEMP &
CURRENT LIMIT SETPOINTS (0-20mA, 4-20 mA / 0 - 10 VDC, 2-10VDC)

YORK INTERNATIONAL
14
FORM 160.54-M1(503)
FIG. 2 – OPTIVIEW CONTROL CENTER - MOD “A” SOLID STATE STARTER APPLICATIONS LD09037
System Architecture
DIGITAL
IN
TRIAC
OUT
RELAY
OUT
POWER
SUPPLY
MICROBOARD
I / O BOARD
KEYPAD
DISPLAY
INTERFACE
BOARD
LIQUID
CRYSTAL
DISPLAY
LAMP BACKLIGHT
INVERTER
BOARD
LAMP
CONTROL
ROW IN
COLUMN OUT
DISPLAY DATA
VANE MOTOR SWITCH
REMOTE CYCLING
HIGH PRESSURE SAFETY
LOCAL START / STOP SWITCH
CHILLED & CONDENSER WATER FLOW SWITCHES
OIL PUMP VSD CYCLING STATUS
MOTOR CONTROLLER SHUTDOWN
REMOTE LEAVING CHILLED WATER TEMP & CURRENT
LIMIT SETPOINTS (CONTACT CLOSURE)
VARIABLE ORIFICE CONTROL
PRE-ROTATION VANE CONTROL
STATUS / ALARM CHILLER SOLENOID VALVES OIL PUMP STARTER OIL HEATER ON/OFF CHILLED & CONDENSER WATER PUMP STARTERS
COMPRESSOR
MOTOR START
MOTOR CONTROLLER SHUTDOWN TO I/O BOARD
MULTIPLEXED DATA
ADDRESS
SOLID
STATE
STARTER
LOGIC
BOARD
COMPRESSO
R
MOTOR CURRENT
+ 24 VDC
+12 / -12 / +5 VDC
OIL PUMP VSD SPEED CONTROL
RS-232 / RS-485 SERIAL DATA
CHILLER TEMPERATURES & PRESSURES
CONDENSER REFRIGERANT LEVEL
HIGH SPEED THRUST BEARING POSITION
REMOTE LEAVING CHILLED WATER TEMP &
CURRENT LIMIT SETPOINTS (0-20mA, 4-20mA / 0 - 10VDC, 2-10VDC)
TRIGGER BOARD STATUS TRIGGER BOARD CONTROL

FORM 160.54-M1(503)
15
YORK INTERNATIONAL
FIG. 3 – OPTIVIEW CONTROL CENTER - MOD “B” SOLID STATE STARTER APPLICATIONS LD09038
2
DIGITAL
IN
TRIAC
OUT
RELAY
OUT
POWER
SUPPLY
MICROBOARD
I / O BOARD
KEYPAD
DISPLAY
INTERFACE
BOARD
LIQUID
CRYSTAL
DISPLAY
LAMP BACKLIGHT
INVERTER
BOARD
LAMP
CONTROL
ROW IN
COLUMN OUT
DISPLAY DATA
VARIABLE ORIFICE CONTROL
PRE-ROTATION VANE CONTROL
STATUS / ALARM CHILLER SOLENOID VALVES OIL PUMP STARTER OIL HEATER ON/OFF CHILLED & CONDENSER WATER PUMP STARTERS
COMPRESSOR
MOTOR START
MOTOR CONTROLLER SHUTDOWN TO I/O BOARD
SERIAL DATA
SOLID
STATE
STARTER
LOGIC/TRIGGER
BOARD
COMPRESSOR MOTOR CURRENT & LINE VOLTAGE
+ 24 VDC
+12 / -12 / +5 VDC
OIL PUMP VSD SPEED CONTROL
RS-232 / RS-485 SERIAL DATA
SCR CONTROL
FACTORY-MOUNTED CHILLED AND CONDENSER LIQUID THERMAL-TYPE
FLOW SENSORS (STYLE "F" AND LATER CHILLERS)
CHILLER TEMPERATURES & PRESSURES
CONDENSER REFRIGERANT LEVEL
HIGH SPEED THRUST BEARING POSITION (NOT APPLICABLE TO "P" COMPRESSORS
AND STYLE "F" AND LATER CHILLERS WITH "G" AND "H5-8" COMPRESSORS)
REMOTE LEAVING CHILLED WATER TEMP &
CURRENT LIMIT SETPOINTS (0-20mA, 4-20 mA / 0 - 10 VDC, 2-10VDC)
VANE MOTOR SWITCH
REMOTE CYCLING
HIGH PRESSURE SAFETY
LOCAL START / STOP SWITCH
CHILLED & CONDENSER WATER FLOW SWITCHES (STYLE "E" AND
EARLIER CHILLERS; OPTIONAL STYLE F AND LATER CHILLERS WITH
FLASH MEMORY CARD VERSION C.MLM.01.08.XXX OR LATER VERSIONS)
OIL PUMP VSD CYCLING STATUS
MOTOR CONTROLLER SHUTDOWN
REMOTE LEAVING CHILLED WATER TEMP & CURRENT
LIMIT SETPOINTS (CONTACT CLOSURE)
HIGH SPEED THRUST BEARING LIMIT SWITCH ("P" COMPRESSORS AND
STYLE "F" AND LATER CHILLERS WITH "G" AND "H5-8" COMPRESSORS)

YORK INTERNATIONAL
16
FORM 160.54-M1(503)
FIG. 4 – OPTIVIEW CONTROL CENTER - COMPRESSOR MOTOR VARIABLE SPEED DRIVE LD09039
System Architecture
RX
SERIAL DATA
POWER
SUPPLY
DIGITAL
IN
MICRO BOARD
I / O BOARD
TRIAC
OUT
RELAY
OUT
KEYPAD
DISPLAY
INTERFACE
BOARD
LIQUID
CRYSTAL
DISPLAY
LAMP BACKLIGHT
INVERTER
BOARD
LAMP
CONTROL
ROW IN
COLUMN OUT
DISPLAY DATA
VARIABLE ORIFICE CONTROL
PRE-ROTATION VANE CONTROL
STATUS / ALARM CHILLER SOLENOID VALVES OIL PUMP STARTER OIL HEATER ON/OFF CHILLED & CONDENSER WATER PUMP STARTERS
COMPRESSOR
MOTOR START
EVAP PRESSURE COND PRESSURE
COMPRESSOR
VSD
ADAPTIVE
CAPACITY
CONTROL
BOARD
+ 24 VDC
+12 / -12 / +5 VDC
OIL PUMP VSD SPEED CONTROL
RS-232 / RS-485 SERIAL DATA
VANE POSITION
TO VARIABLE SPEED DRIVE (VSD)
TX / RX
SERIAL DATA
TX/RX
SERIAL DATA
VSD
LOGIC
BOARD
VSD
FILTER
BOARD
FACTORY-MOUNTED CHILLED AND CONDENSER LIQUID THERMAL-TYPE
FLOW SENSORS (STYLE "F" AND LATER CHILLERS)
CHILLER TEMPERATURES & PRESSURES
CONDENSER REFRIGERANT LEVEL
HIGH SPEED THRUST BEARING POSITION (NOT APPLICABLE TO "P" COMPRESSORS
AND STYLE "F" AND LATER CHILLERS WITH "G" AND "H5-8" COMPRESSORS)
REMOTE LEAVING CHILLED WATER TEMP &
CURRENT LIMIT SETPOINTS (0-20mA, 4-20 mA / 0 - 10 VDC, 2-10VDC)
VANE MOTOR SWITCH
REMOTE CYCLING
HIGH PRESSURE SAFETY
LOCAL START / STOP SWITCH
CHILLED & CONDENSER WATER FLOW SWITCHES (STYLE "E" AND
EARLIER CHILLERS; OPTIONAL STYLE F AND LATER CHILLERS WITH
FLASH MEMORY CARD VERSION C.MLM.01.08.XXX OR LATER VERSIONS)
OIL PUMP VSD CYCLING STATUS
MOTOR CONTROLLER SHUTDOWN
REMOTE LEAVING CHILLED WATER TEMP & CURRENT
LIMIT SETPOINTS (CONTACT CLOSURE)
HIGH SPEED THRUST BEARING LIMIT SWITCH ("P" COMPRESSORS AND
STYLE "F" AND LATER CHILLERS WITH "G" AND "H5-8" COMPRESSORS)

FORM 160.54-M1(503)
17
YORK INTERNATIONAL
0 10 13 45 50 110
(0.17) (0.22) (0.75) (0.83) (1.83)
START
VANES
START
TO
CLOSE
VANES
CLOSED
1800
(30)
RESTART
FLOW
BYPASS
SWITCH
MAN. OIL
PUMP
DISABLED
AUTO ZEROING DIFFERENTIAL
OIL PRESSURE TRANSDUCERS
ENERGIZE (OPEN)
OIL RETURN SOLENOID & LIQUID LINE
SOLENOID (J COMPRESSOR ONLY)
** VANES CLOSING - TIME
DEPENDENT ON INITIAL
VANE POSITION
OIL PRESSURE CHECK
OIL PUMP ON
150 SEC.
(2.5 MIN)
"SYSTEM
COASTDOWN"
"SYSTEM
SHUTDOWN"
TIME IN SECONDS (MINUTES)
DISPLAY
MESSAGE
"SYSTEM RUN"
"SYSTEM PRELUBE"
** "VANES CLOSING
BEFORE
SHUTDOWN"
0 10 13 45 50 65 110
(0.17) (0.22) (0.75) (0.83) (1.08) (1.83)
START
VANES
START
TO
CLOSE
VANES
CLOSED
1800
(30)
RESTART
FLOW
BYPASS
SWITCH
MAN. OIL
PUMP
DISABLED
AUTO ZEROING DIFFERENTIAL
OIL PRESSURE TRANSDUCERS
ENERGIZE (OPEN) HIGH SPEED
THRUST SOLENOID
ENERGIZE (OPEN) LIQUID LINE, VENT LINE
& OIL RETURN SOLENOIDS
** VANES CLOSING - TIME
DEPENDENT ON INITIAL
VANE POSITION
OIL PRESSURE CHECK
OIL PUMP ON
150 SEC.
(2.5 MIN)
"SYSTEM RUN"
"SYSTEM PRELUBE"
** "VANES CLOSING
BEFORE
SHUTDOWN"
"SYSTEM
COASTDOWN"
"SYSTEM
SHUTDOWN"
TIME IN SECONDS (MINUTES)
DISPLAY
MESSAGE
TIMING DIAGRAM – CHILLERS EQUIPPED WITH FIXED SPEED OIL PUMP (STYLE C)
TIMING DIAGRAM – CHILLERS EQUIPPED WITH
VARIABLE SPEED OIL PUMP
(STYLE D/E/F)
LD06501
LD06502
FIG. 5 – OPERATION SEQUENCE TIMING DIAGRAM
(ELECTRO-MECHANICAL & SOLID STATE STARTER APPLICATIONS)
**Only applicable to the following shutdowns. When any of these
shutdowns are performed, the vanes are driven fully closed before
the starter is de-energized. When the vane motor switch closes
(or 210 seconds from start of vane closure have elapsed), the
starter is de-energized. 1. Low Water Temperature; 2. Multi-Unit
Sequence (TB4-9); 3. Remote/Local Cycling (TB4-13); 4. Internal
Time Clock; 5. Remote Stop (TB4-8); 6. Remote Stop (ISN Serial
Port). Operator initiated Soft Shutdown (Flash Memory Card ver-
sion C.MLM.01.06.xxx and later or C.MLM.04.02.xxx)
2

YORK INTERNATIONAL
18
FORM 160.54-M1(503)
0 10 13 45 50 65 110
(0.17) (0.22) (0.75) (0.83) (1.08) (1.83)
START
VANES
START
TO
CLOSE
VANES
CLOSED
600
(10)
RESTART
(ONLY AFTER FIFTH
SUCCESSIVE RESTART)
FLOW
BYPASS
SWITCH
MAN. OIL
PUMP
DISABLED
AUTO ZEROING DIFFERENTIAL
OIL PRESSURE TRANSDUCERS
ENERGIZE (OPEN) HIGH SPEED
THRUST SOLENOID
ENERGIZE (OPEN) LIQUID LINE*, VENT LINE
& OIL RETURN SOLENOIDS
** VANES CLOSING - TIME
DEPENDENT ON INITIAL
VANE POSITION
OIL PRESSURE CHECK
OIL PUMP ON
150 SEC.
(2.5 MIN)
"SYSTEM
COASTDOWN"
"SYSTEM
SHUTDOWN"
TIME IN SECONDS (MINUTES)
DISPLAY
MESSAGE
RESTART
(IF FIVE SUCCESSIVE
RESTARTS HAVE NOT
OCCURED)
"SYSTEM RUN"
"SYSTEM PRELUBE"
** "VANES CLOSING
BEFORE
SHUTDOWN"
0 10 13 45 50 110
(0.17) (0.22) (0.75) (0.83) (1.83)
START
VANES
START
TO
CLOSE
VANES
CLOSED
FLOW
BYPASS
SWITCH
MAN. OIL
PUMP
DISABLED
AUTO ZEROING DIFFERENTIAL
OIL PRESSURE TRANSDUCERS
ENERGIZE (OPEN)
OIL RETURN SOLENOID & LIQUID LINE
SOLENOID (J COMPRESSORS ONLY)
** VANES CLOSING - TIME
DEPENDENT ON INITIAL
VANE POSITION
OIL PRESSURE CHECK
OIL PUMP ON
150 SEC.
(2.5 MIN)
"SYSTEM
COASTDOWN"
"SYSTEM
SHUTDOWN"
TIME IN SECONDS (MINUTES)
DISPLAY
MESSAGE
600
(10)
RESTART
(ONLY AFTER FIFTH
SUCCESSIVE RESTART)
RESTART
(IF FIVE SUCCESSIVE
RESTARTS HAVE NOT
OCCURED)
"SYSTEM RUN"
"SYSTEM PRELUBE"
** "VANES CLOSING
BEFORE
SHUTDOWN"
TIMING DIAGRAM – CHILLERS EQUIPPED WITH FIXED SPEED OIL PUMP (STYLE C)
TIMING DIAGRAM – CHILLERS EQUIPPED WITH
VARIABLE SPEED OIL PUMP
(STYLE D/E/F)
LD06503
FIG. 6 – OPERATION SEQUENCE TIMING DIAGRAM
(COMPRESSOR MOTOR VARIABLE SPEED DRIVE APPLICATIONS)
* The Liquid Line solenoid will only be energized during this period when the oil
temperature reaches > 140°F. It will then be de-energized when the temprature
is < 135°F.
**Only applicable to the following shutdowns. When any of these shutdowns
are performed, the vanes are driven fully closed before the starter is de-
energized. When the vane motor switch closes (or 210 seconds from start
of vane closure have elapsed), the starter is de-energized. 1. Low Water
Temperature; 2. Multi-Unit Sequence (TB4-9); 3. Remote/Local Cycling
(TB4-13); 4. Internal Time Clock; 5. Remote Stop (TB4-8); 6. Remote Stop
(ISN Serial Port). Operator initiated Soft Shutdown (Flash Memory Card
version C.MLM.01.06.xxx and later or C.MLM.04.02.xxx)
System Architecture
LD06504

FORM 160.54-M1(503)
19
YORK INTERNATIONAL
SECTION 3
MICROBOARD
(REFER TO FIG. 7 - 12)
The Microboard contains the operating software (Pro-
gram), microprocessor (Micro), and supporting circuits
for the Micro.
The Program is a set of instructions to control the
chiller, the display and peripheral devices. It also
contains the Safety and Cycling shutdown thresholds
(non changeable) and Display messages and screens.
It is stored in a memory device called a flash memory
card. This is a type of non-volatile memory that can be
read from or written to, but requires the locations to be
erased before they are written to. With the exception of
a write/read sequence that occurs during the Boot-up
process explained below, this device is used primarily
as read-only in this application. A write protect switch
is located on the left edge of the card as shown in Fig.
8. It must be placed in the “Write Enabled” position in
order to allow successful Boot-up. The card is located
in socket location U46 (Ref. Fig. 7). It connects to the
Board via an Elastomeric connector that is a silicon rub-
ber strip embedded with silver conductors. The Card
can be removed from its socket by using the thumb to
press down on the socket’s plastic tension spring. The
card is installed by inserting it into the socket/holder and
pressing on the surface of the Card until it snaps into
place. The Memory card is a replaceable component.
Refer to YORK Renewal Parts List Form 160.54-RP1.
The version of the Memory card is an alpha-numeric
code that represents the application and revision level.
The version is printed on a label adhered to the memory
card’s surface. The version code is as follows:
C.MLM.nn.nn.nnn
Language Package Revision Level
(00, 01, etc.)
Language Package*
(0=English only, 1=NEMA 1-4, 2=CE)
Controls Revision Level (00, 01, etc.)
Chiller Type
(01=YK (all compressors after 8/02),02=YT,
03=YS, 04=YK (“P” compressors before
8/02), 05=YR)
MaxE™ Chiller
Commercial Chiller
* Refer to YORK Renewal Parts List 160.54-RP1 for available
languages.
1 = Supplied in new NEMA 1-4 OptiView Control Centers but
can be retrofit to any OptiView Control Center.
2 = Supplied in new CE (European Community) OptiView Con-
trol Centers but can be retrofit to any OptiView Control
Center.
There are several Flash Memory Cards available. The
difference between them is the different languages that
can be displayed on the Display Screens. Language se-
lection is performed on the USER Screen following
instructions in Operations Manual 160.54-O1. Not all
languages are available. Refer to Renewal Parts List
160.54-RP1 for list of available Flash Memory Cards and
display languages. IMPORTANT! – Not all versions
of Flash Memory Cards are compatible with revision
“E” (and later) Microboards or all BIOS Eproms. If an
incompatible version is used, the initialization (boot-up)
process will not complete and the chiller will not run!
Refer to Renewal Parts List 160.54-RP1 and “Service
Replacement” paragraph in this section.
3

YORK INTERNATIONAL
20
FORM 160.54-M1(503)
Flash Memory Cards are revised to add new features,
enhancements and program corrections. Each time they
are revised, the revision level of the affected portion of
the program (controls or language) increments. Each
time they are revised, a Service Information Bulletin is
issued that describes the new features. Those bulletins
that have been issued to date, are located at the rear of this
manual.
The Micro controls the chiller by reading and executing
the Program instructions in a sequence determined by
the Program. Under Program control, the Micro reads
the Analog and Digital Inputs to determine the oper-
ating conditions and controls Digital Outputs based
upon these inputs. These inputs are compared to stored
thresholds to determine if a Safety or Cycling shutdown
is required. If a threshold has been exceeded, a shutdown
is performed and the appropriate message is retrieved
from the Program and displayed on the Liquid Crystal
Display. As operating conditions require, status mes-
sages are retrieved and displayed. The Keypad is read as
Digital Inputs. When an operator presses a key to request
a display, the Micro interprets the request, retrieves the
display from the Program and displays it. The Program
assembles data in the correct format for transmission
through the Serial Data Ports to peripheral devices. The
Program also instructs the Micro to respond to requests
from peripheral devices for serial data transmissions.
The MUX (multiplexer) is a switching device that only
allows one analog input through at a time. The inputs
are selected sequentially by the Micro per Program
instructions.
The A/D Converter converts each analog input to a
12-bit word. In this form, the values can be stored in
memory devices, compared to values in the Program,
transmitted through Serial Ports or sent to the Display
Controller for display. Control signals to start conversion
process are from the Micro via the FPGA.
The Watchdog circuit monitors the +5VDC supply
from the external Power Supply to determine when
a power failure is occurring. Just prior to the supply
decreasing to a level where the Micro and supporting
circuits can no longer operate, it applies a reset signal
to the Micro. The Micro responds by de-energizing the
run digital output through the FPGA, shutting down the
chiller and retrieving the Power Failure message from
the Program and sending it to the Display Controller
for display. Similarly, when power is first applied after
a power failure, it maintains the Micro in a reset state
until the +5VDC has returned to a sufficient level. The
Watchdog circuit also assures that all the Program in-
structions are being performed and that the Program has
not latched-up, bypassing important safety thresholds. If
the Program has latched-up, The Micro initiates a Safety
shutdown and displays WATCHDOG – SOFTWARE
REBOOT message.
The Program Jumpers (Table 1) and Program Switch-
es (Table 2) are used to alter the Program operation
or configure the Microboard hardware for specific
operation. This allows the Program and Microboard
to be universal for all applications of the chiller. Refer
to Table 1 and 2 for the function of each jumper and
switch. The position of some can be determined and set
by the Service Technician to meet the desired operation
or chiller application. The position of others is dictated
by the size, type or style of certain OptiView Control
Center components and thus the position is determined
by the YORK Factory. The required position of each
is listed in these tables. The Program Jumpers are wire
bridges that are either left in place or cut. The Program
Switches are miniature switches that are placed in either
the ON or OFF position.
The DRAM (dynamic random access memory) is a non
battery-backed memory device. The Micro stores data
here temporarily for further processing. Data in this de-
vice is lost during power failures. DRAM differs from
RAM in that DRAM must be periodically refreshed in
circuit.
The BIOS EPROM (basic input/output system erasable
programmable read only memory) is a memory device
that contains the bootstrap or power-up program. It is
located in socket location U45. This EPROM is replace-
able. Refer to YORK Renewal Parts List Form 160.54-
RP1. The EPROM version is an alpha-numeric code
that represents the application and revision level. The
version is printed on a label adhered to the EPROM’s
surface. The version code is as follows:
Microboard
C. MLM. 00. XX.
Revision level. Increments 01, 02 etc.
YM Chiller BIOS EPROM
MAXE™ Chiller
Commercial Chiller