York 00497VIP User Manual

OPTIVIEW

TM

REMOTE CONTROL CENTER

INSTALLATION, OPERATION & SERVICE

OPTIVIEW™ REMOTE CONTROL CENTER

New Release

Form 50.40-OM2 (601)

00497VIP

IMPORTANT!

READ BEFORE PROCEEDING!

GENERAL SAFETY GUIDELINES

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 responsibility 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 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
individual 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 understood 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:

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, togeth e r wit h a brief
explanation.

WARNING indicates a potentially
hazardous situation which, if not
avoided, could result in death or

NOTE is used to highlight additional
information which may be helpful
to you.

serious injury.

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 YORK’s published specications and must be performed only by qualied 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.

YORK INTERNATIONAL2

CHANGEABILITY OF THIS DOCUMENT

FORM 50.40-OM2

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 ofce.

It is the responsibility of operating/service personnel
as to the applicability of these documents to the
equipment in question. If there is any question in
the mind of operating/service personnel as to the
ap plicability of these do cuments, then, prior to
working on the equipment, they should verify with
the owner whether the equipment has been modied
and if current literature is available.

3YORK INTERNATIONAL

TABLE OF CONTENTS

SECTION 1 PRODUCT DESCRIPTION ....................................................................... 8

Chiller/Condensing Control Panel(s) .......................................................... 9

SECTION 2 INSTALLATION........................................................................................ 10

Mounting ..................................................................................................10

Installation Checklist ................................................................................ 10

Wiring ................................................................................................... 10

Lan Transient Installation ......................................................................... 14

Eprom Compatibility ................................................................................ 14

Troubleshooting .......................................................................................14

Safety ................................................................................................... 14

Proper Installation Practices ..................................................................... 15

SECTION 3 OPERATION............................................................................................. 18

OptiView Remote Control Center ............................................................. 18

Screen Descriptions and Usage................................................................. 19

Home Screen............................................................................................. 22

Unit Screen ..........................................................................................24

Systems Screen............................................................................... 29

Individual System Screen.......................................................... 32

Hours/Starts Screen ........................................................................ 34

Options Screen ...............................................................................36

Trending Screen .............................................................................38

Trend Setup Screen................................................................... 40

Setpoints Screen ............................................................................. 44

History Screen ................................................................................ 47

History Details Screen .............................................................. 48

RCC Setpoints Screen ......................................................................... 49

RCC Setup Screen .......................................................................... 50

Comms Screen .......................................................................... 52

Printer Screen ............................................................................53

Diagnostics Screen ....................................................................54

Diagnostics (I/O) Screen ..................................................... 55

Diagnostics (RCC Comms) Screen ..................................... 56

Display Messages ..................................................................................... 58

SECTION 4 PRINTERS ............................................................................................... 59

SECTION 5 SERVICE ................................................................................................. 65

Introduction............................................................................................... 65

YORK INTERNATIONAL4

FORM 50.40-OM2

System Architecture.................................................................................. 66

Microboard................................................................................................ 68

Microboard Program Jumpers .................................................................. 76

Microboard Program Switches .................................................................78

Liquid Crystal Display.............................................................................. 81

Display Interface Board ............................................................................ 87

Display Backlight Inverter Board ............................................................. 89

Keypad .................................................................................................... 91

Power Supply............................................................................................ 94

Ofine Diagnostics & Troubleshooting.................................................... 96

Main Diagnostics ...................................................................................... 97

Keypad Test............................................................................................... 98

Display Test .............................................................................................. 99

Bit Pattern Test ....................................................................................... 100

Serial Inputs / Outputs Tests ................................................................... 101

Digital Inputs / Outputs Tests ................................................................. 103

Analog Inputs Test ..................................................................................104

System Commissioning Checklist .......................................................... 105

SECTION 6 PART NUMBER AND RENEWAL PARTS........................................... 106

LIST OF TABLES

TABLE 1 – Required Software Version of the Chiller/Condensing Unit Eproms .......... 11

TABLE 2 – Program Jumpers ......................................................................................... 76

TABLE 3 – Program Switches ........................................................................................78

TABLE 4 – Part Number ...............................................................................................106

TABLE 5 – Renewal Parts ............................................................................................106

5YORK INTERNATIONAL

LIST OF FIGURES

FIG. 1 – EU DECLARATION OF CONFORMITY ............... 7

FIG. 2 – FIELD WIRING ................................................... 12

FIG. 3 – CONTROL INSTALLATION ................................ 16

FIG. 4 – GROUNDING ..................................................... 16

FIG. 5 – SEPARATE CONDUIT INSTALLATION .............. 17

FIG. 6 – POWER & GROUND WIRE CONNECTIONS.... 17

FIG. 7 – OPTIVIEW REMOTE CONTROL CENTER ....... 18

FIG. 8 – SCREEN NAVIGATION LAYOUT ....................... 20

FIG. 9 – HOME SCREEN ................................................. 22

FIG. 10 – UNIT SCREEN ................................................... 24

FIG. 11 – SYSTEMS SCREEN .......................................... 29

FIG. 12 – INDIVIDUAL SYSTEM SCREEN........................ 32

FIG. 13 – HOURS AND STARTS SCREEN ....................... 34

FIG. 14 – OPTIONS SCREEN ........................................... 36

FIG. 15 – TRENDING SCREEN ......................................... 38

FIG. 16 – TRENDING SETUP SCREEN ............................ 40

FIG. 17 – SETPOINTS SCREEN ....................................... 44

FIG. 18 – HISTORY SCREEN............................................ 47

FIG. 19 – HISTORY DETAILS SCREEN ............................ 48

FIG. 20 – RCC SETPOINTS SCREEN .............................. 49

FIG. 21 – RCC SETUP SCREEN ....................................... 50

FIG. 22 – COMMS SCREEN .............................................. 52

FIG. 23 – PRINTER SCREEN ............................................ 53

FIG. 24 – DIAGNOSTICS SCREEN ................................... 54

FIG. 25 – DIAGNOSTICS I/O SCREEN ............................. 55

FIG. 26 – DIAGNOSTICS RCC COMMS SCREEN ........... 56

FIG. 27 – PRINTERS ......................................................... 59

FIG. 28 – EXAMPLE PRINTOUT (OPERATING DATA)...... 63

FIG. 29 – EXAMPLE PRINTOUT (HISTORY HEADER) .... 64

FIG. 30 – CONTROL CENTER BLOCK DIAGRAM ........... 67

FIG. 31 – MICROBOARD ................................................... 73

FIG. 32 – FLASH MEMORY CARD.................................... 74

FIG. 33 – BLOCK DIAGRAM, MICROBOARD .................. 75

FIG. 34 – MICROBOARD LAMP DIMMER CIRCUIT ......... 78

FIG. 35 – SERIAL DATA COMMUNICATIONS PORTS...... 79

FIG. 36 – CONFIGURABLE ANALOG INPUTS ................. 80

FIG. 37 – DISPLAY, MOUNTING........................................ 84

FIG. 38 – LCD TYPICAL CONTROL SIGNAL TIMING ...... 84

FIG. 39 – LG SEMICON LP104V2 DISPLAY ASSEMBLY - 85

FIG. 40 – SHARP LQ10D367 DISPLAY ASSEMBLY - ...... 85

FIG. 41 – SHARP LQ10D367 BACKLIGHT LAMP

REPLACEMENT ................................................ 86

FIG. 42 – LG SEMICON LP104V2 BACKLIGHT LAMP

REPLACEMENT................................................. 86

FIG. 43 – DISPLAY INTERFACE BOARD .......................... 88

FIG. 44 – DISPLAY BACKLIGHT INVERTER BOARD....... 90

FIG. 45 – KEYPAD ............................................................. 92

FIG. 46 – DIAGRAM, KEYPAD........................................... 93

FIG. 47 – BLOCK DIAGRAM, DC POWER DISTRIBUTION. 95

FIG. 48 – MAIN DIAGNOSTIC SCREEN ........................... 97

FIG. 49 – KEYPAD TEST SCREEN ................................... 98

FIG. 50 – DISPLAY TEST SCREEN................................... 99

FIG. 51 – BIT PATTERNS TEST SCREEN....................... 100

FIG. 52 – SERIAL INPUTS/OUTPUTS TESTS SCREEN 101

FIG. 53 – DIGITAL INPUTS/OUTPUTS TESTS SCREEN 103

FIG. 54 – ANALOG INPUTS TEST SCREEN .................. 104

FIG. 55 – FRONT OF OPTIVIEW RCC ............................ 107

FIG.56 – INSIDE OF OPTIVIEW RCC ............................ 107

FIG.57 – INSIDE DOOR OF OPTIVIEW RCC ................ 108

FIG.58 – LOCATION OF FUSE, F1 & F2 ........................ 109

YORK INTERNATIONAL6

FORM 50.40-OM2

FIG. 1 – EU DECLARATION OF CONFORMITY

7YORK INTERNATIONAL

Product Description

SECTION 1 – PRODUCT DESCRIPTION

The YORK OptiView Remote Control Center is a
microprocessor based control system capable of
remotely monitoring certain chillers and condensing
units. It can monitor and individually control 1 to 8 of
these chiller/condensing units.

The panel comes congured with a full screen color
LCD Graphic Display mounted in the middle of a
keypad interface. The graphic display allows the
presentation of the current information all at once. In
addition, the operator may view a graphical representa­tion of several operating parameters. For the novice
user, the locations of various parameters are clearly and
intuitively marked. Instructions for specic operations
are provided on many of the screens.

The graphic display also allows information to be
represented in Imperial units (temperatures in °F and
pressures in PSIG or PSID) or SI units (temperatures in
°C and pressures in BARG or BARD).

All values that are modiable at the Remote Control
Center are recorded in memory and preserved even
through a power failure condition. During operation, the
chillers are continually polled and the user is advised of
the operating conditions by various status and warning
messages. A complete listing of shutdown, status, and
warning messages is within the chiller/condensing
unit’s operation manual.

If the chiller/condensing unit is in remote control mode
the OptiView Remote Control Center provides the
capability to program the following:

1. Start Command

2. Stop Command

3. Local Setpoint

4. Local Control Range

5. Daily/Holiday Schedule

6. Current or Load Limit Setpoint

The Remote Control Center is also designed to enable
the user to obtain chiller/condensing unit printouts
directly from this panel.

This equipment has been tested and
found to comply with the limits for
a Class A digital device, pursuant
to part 15 of the FCC Rules. These
limits are designed to provide reason­able protection against harmful
interference when the equipment is
operated in a commercial environ­ment. This equipment generates,
uses, and can radiate radio frequency
energy and, if not installed and
used in accordance with the instruc­tion manual, may cause harmful
interference to radio communica­tions. Operation of this equipment in
a residential area is likely to cause
harmful interference in which case
the user will be required to correct
the interference at his own expense.

YORK INTERNATIONAL8

FORM 50.40-OM2

CHILLER/CONDENSING CONTROL PANEL(S)

All communication with the chiller/condensing units
will occur over a single RS-485 port. Reference Figure
2 and the Installation instructions.

When the OptiView RCC is first turned on it will
initialize by requesting current data and history buffer
information from the units connected. After the history
buffers are lled, only current data will be continuously
requested. Every eight hours the OptiView RCC will re­initialize. If the control panel updates the history buffer
(a safety shutdown has occurred), the control panel
will send the chiller shutdown data to the OptiView
RCC upon receipt of the next valid OptiView RCC
transmission. The OptiView RCC will recognize that
a safety shutdown has occurred by the Update History
Buffer bit being set. If this bit is ever 1, the data dump is
assumed to be a shutdown data dump and the OptiView
RCC will update its history buffers with the new data
and start a printout of the transmitted data through its
RS232 port. If the OptiView RCC had been requesting
another type of data dump (i.e. a daily schedule dump),
the OptiView RCC will repeat its request on the next
transmission.

While at the Home Screen, the OptiView RCC will
communicate with each unit in order. Once a unit has
been selected by entering the Unit Screen or any screen
below it, that unit will be polled between every unit
in order. This will allow the selected unit to update its
information quickly while still maintaining information
for the Home Screen.

A command string is used to indicate what data the
OptiView RCC is requesting and to modify control data
in the chiller control panel. If the chiller/condensing
unit is in remote control mode then its Local Set
Point, Local Range, Daily Schedule, Holiday, Start

/ Stop Command, and Current / Load Limit can be
programmed from the OptiView RCC. The OptiView
RCC will send a command string once any of these are
modied at the OptiView RCC. If the OptiView RCC
sends a Stop command, the chiller/condensing unit will
turn off. If the OptiView RCC sends a start command,
the chiller/condensing unit will be allowed to run if all
the other run requirements of the unit are made.

A chiller/condensing unit that is in remote control
mode will use local control (set points and start / stop
information), if a valid transmission has not been
received for 5 minutes from the OptiView RCC. The
remote commands will be used again once a valid
new transmission has been processed. The OptiView
RCC will display an error message indicating the
communications problem when such a condition
occurs.

A general status message for each unit is displayed
on the Home Screen. The messages displayed will
include communications status. Not Initialized will
be displayed upon power-up for all units until the
OptiView RCC begins to poll and receive data from
that unit. Initializing… will be displayed while the
OptiView RCC is polling a unit for all current, schedule,
and history data the rst time after power-up. Loss of
Comms will be displayed after 5 minutes have elapsed
with no response from a previously initialized unit. If
any of these messages is displayed, the unit’s button
will be disabled not allowing it to be selected.

The Control Center Microboard (J12) communicates
with this board via a 0/+5VDC serial data communica­tions link. If this communications link does not operate
properly, correct Microboard J12 serial port operation
can be veried using the Serial Inputs and Outputs
diagnostic procedure in the “Service” section of this
book.

1

9YORK INTERNATIONAL

Installation

SECTION 2 – INSTALLATION

MOUNTING

Mount the Remote Control Center at a level that
provides for easy viewing of the color graphic display
by all users. Securely mount it at the desired location.
The panel may be mounted away from the chiller as far
as 4000 ft. (1219 m.) of wiring will allow.

INSTALLATION CHECKLIST

(Reference Fig. 2 for wiring)

• A communications cable must connect the OptiView

RCC to the chiller/condenser control panel. This
cable should be a three-conductor with foil shield
and drain wire, 20 awg or larger wire, 300v, 80 Deg.
C, UL Style 2464, UL listed and CSA approved.
Three sources are Alpha 5463, Belden 9364, or
Quabbin 0220. The cable length (sum of lengths of
all cables) must not exceed 4000 ft. (1219 m.). The
cable is user supplied.

• Obtain ferrite (part number 025-35154-000) from

the cloth bag found in the OptiView RCC and
install it as shown on Fig. 2. This must be installed
to meet FCC and CE requirements.

• Make sure that the Transient Voltage Suppressors are

installed at J12. One is installed from “+” to “GND”
and one is installed from “-” to “GND”.

• At J12 of the OptiView RCC, red wire on RS485(+),

black wire on RS485(-) and white wire on Ground.

• At the OptiView RCC, connect the shield to the

panel.

• Use a tie wrap between the J12 connector and the

Ferrite (part number 025-35154-000) to secure the
shielded cable to the OptiView RCC. The tie wrap
can help prevent the wires from being accidentally
pulled out of the J12 connector by someone working
in the panel or by the weight of the ferrite.

• Install a LAN transient protection module at the

chiller/condenser control panel and connect the
cable according to the type of control panel.

• Make sure the correct EPROM is installed at the

chiller/condenser control panel(s). See Table 1.

• From the Setpoints Screen of the OptiView RCC,

enter the Number of Units Connected (Maximum
value allowed is 8).

• At the chiller/condenser control panel that uses

a rotary switch to set the ID, use a small screw
driver to rotate the rotary switch so that the arrow
points at the number that coincides with the Unit’s
Identication number (ID#). Unit 1 - Unit 8 coincide
to rotary switches 0 - 7. Otherwise program the
panel’s ID through keypad entry.

Never skip an ID#. For example, if
you have four units then they must be
identied from ID#0 - ID#3.

• At the chiller/condenser unit’s control panel, select

the type of control mode. Select REMOTE only if
remote control is desired. Select LOCAL to only
monitor this unit.

• From the Comms Screen of the OptiView RCC,

enter the RCC Poll Time. This is how often (time
in seconds) to request data. This time should be set
long enough to allow for receiving the data.

WIRING

A communications cable must connect the chiller to the
remote panel. This cable should be a three-conductor
with foil shield and drain wire, 20 awg or larger sized
wire, 300v, 80 Deg. C, U.L. Style 2464, U.L. listed
and CSA approved. Three sources are Alpha 5463,
Belden 9364, or Quabbin 0220. The cable length (sum
of lengths of all cables) must not exceed 4000 ft.
(1219 m.).

Never run the communication cable in
close proximity to any power wiring.
For best results, it should be run in
dedicated, grounded conduit. See
Proper Installation Practices.

YORK INTERNATIONAL10

FORM 50.40-OM2

REQUIRED SOFTWARE VERSION OF THE

CHILLER / CONDENSING UNIT EPROMS

TABLE 1 – REQUIRED SOFTWARE VERSION OF THE CHILLER/CONDENSING UNIT EPROMS

UNIT TYPE EPROM PART NO. VERSION
YCAL / YCUL w/microboard 031-01314-000 031-02011-001 C.MMC.01.05
YCAL / YCUL w/microboard 031-02050-000 031-02049-001 C.MMC.03.02
YCAS - F 2 Compressors 031-01798-001 C.ACS.09.03
YCAS - F 3 & 4 Compressors 031-01798-002 C.ACS.10.02
YCAR 2 Compressors 031-02013-001 C.RCP.23.02

The software version is printed on a label adhered to the EPROM chip’s surface. A revision level higher than the one
listed in the table is acceptable. An example version code is as follows:

C. ACS. 09. XX.

2

Revision Level. Increments 01, 02 etc.

Product Code

YCAS (RCP = YCAR, MMC =YCAL/YCUL)

Commercial

11YORK INTERNATIONAL

Tie Wrap (To help
keep wires
connected)

Ferrite
(025-35154-000)
(FCC & CE
Requirement)

A

A

A

Transient Voltage
Suppressor
(031-02076-000)
(Factory Installed)

Installation

OPTIVIEW REMOTE CONTROL CENTER

FIG. 2 – FIELD WIRING OPTIVIEW RCC PANEL

LD06725

YORK INTERNATIONAL12

SHLD

BLK

SHLD

RED

(TOTAL NOT TO
EXCEED 8)

WHT

BLK

SHLD

RED

FROM
OPTIVIEW RCC

WHT

BLK

RED

WHT

(COMPONENT
SIDE UP)

(COMPONENT
SIDE DOWN)

(COMPONENT
SIDE DOWN)

X

X

CUT PINS
AS SHORT
AS POSSIBLE

X

X

CUT PINS
AS SHORT
AS POSSIBLE

FORM 50.40-OM2

2

FIG. 2 – FIELD WIRING OPTIVIEW RCC PANEL (CONT.)

LD06726

13YORK INTERNATIONAL

Installation

LAN TRANSIENT INSTALLATION

The properly installed Lan Transient Protection Module,
(part number 031-01586-000) will limit the voltage
levels seen by the chiller control panel’s RS-485 driver
while allowing normal RS-485 network operation under
non-transient conditions. For installation of the module
refer to Fig. 2 and the specic installation instructions
for the microboard.

Unit Microboard 031-01314-000 and
031-02050-001:

Step 1: Label all wires, cables, or components con-

nected to TB1.

Step 2: Carefully loosen each terminal of TB1. Remove
all wires, cables, or components. Be extremely careful
to not allow them to short together or to the enclosure.

Step 3: Refer to the Module. Replace all wires,
cables, or components taken from TB1 into the cor­rect terminals of the Module terminal strip J1 being
extremely careful to not allow them to short together
or to the enclosure.

Step 4: Carefully tighten all screws on the Module
Terminal strip J1.

Step 5: Orient the Module as shown (component side
down) and cut the unused pins. Insert the four P1
Module pins into TB1 as shown.

Step 6: Carefully tighten each terminal of TB1. Double
check all wiring to the Module before closing up.

Unit Microboard 031-01095-000:

Step 1: Label all wires, cables, or components con-

nected to TB7.

Step 2: Carefully loosen each terminal of TB7. Remove
all wires, cables, or components. Be extremely careful
to not allow them to short together or to the enclosure.

Step 3: Replace all wires, cables, or components taken
from TB7 into the Module terminal strip J1 being
extremely careful to not allow them to short together
or to the enclosure.

Step 4: Carefully tighten all screws on the Module
Terminal strip J1.

Step 5: Orient the Module as shown (component side
up) and insert all six P1 Module pins into TB7 as
shown.

Step 6: Carefully tighten each terminal of TB7. Double
check all wiring to the Module before closing up.

EPROM COMPATIBILITY

Since the concept and design of the OptiView Remote
Control Center may have occurred after the original
EPROM (software) for the chiller/condenser control
panel, the EPROM may need to be replaced with
one that allows for OptiView Remote Control Center
operation. See Table 1.

TROUBLESHOOTING

From the Home Screen you can determine if you are
communicating to the chiller/condensing unit.

If the message Not Initialized.. remains shown on this
screen, proper communication between the panels has
not occurred and you will need to troubleshoot.

Step 1: If you are trying to communicate with more
than one unit, simplify the troubleshooting by isolating
the communication to one unit at a time. Remove any
wiring to a secondary unit and from the Setpoints
Screen of the OptiView RCC, enter one as the Number
of Units Connected and at the chiller/condenser control

panel set it’s ID to zero.

Step 2: Check if there is any communication problem
occurring on the Diagnostic RCC Comms Screen. See
the description of this screen.

You could also check that the RX3 I/O communication
activity LED on the OptiView Main Processor Board is
blinking as it receives data from the chiller/condensing

unit’s control panel. A steady lit RX3 LED is a sign of
improper wiring. If the RX3 LED is not blinking check
the wiring and the installation of the Lan Transient
Protection Module. If everything is properly connected

replace the 485 driver on the chiller/condenser

microboard (part number 031-02074-000).

SAFETY

It is recommended that all maintenance and service
repair work be performed by experienced personnel.
There must be recognition of the potential hazards
that can exist. Those hazards may include (but are
not limited to):

YORK INTERNATIONAL14

FORM 50.40-OM2

There can be electrical circuitry that
presents an electrocution hazard. Be
sure that the sources of all power
supplies have been properly isolated
and secured before attempting any
service related activities.

External wiring, unless specied as
an optional connection in the manu­facturer’s product line, is not to be
connected inside the OptiView Remote
Control Center cabinet. Devices such
as relays, switches, transducers and
controls may not be installed inside
the OptiView Remote Control Center.

No external wiring is allowed to be
run through the OptiView Remote
Control Center. All wiring must be in
accordance with YORK’s published
specications 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.

PROPER INSTALLATION PRACTICES

Earlier relay systems were virtually immune to radio
frequency interference (RFI), electromagnetic interfer­ence (EMI), and ground loop currents. Installation
consisted of hooking up the point-to-point wiring and
sizing the wire properly.

In an electronic system, improper installation will
cause problems that outweigh the benets of electronic
control. Electronic equipment is susceptible to RFI,
EMI, and ground loop currents which can cause equip­ment shutdowns, processor memory and program loss,
erratic behavior, and false readings. Manufacturers of
industrial electronic equipment take into consideration
the effects of RFI, EMI, and ground loop currents and
incorporate protection of the electronics in their designs.
These manufacturers require that certain installation
precautions be taken to protect the electronics from
these effects. All electronic equipment must be viewed

as sensitive instrumentation and therefore requires
careful attention to proper installation procedures.

There are a few basics, that if followed, will result in
a trouble-free installation. The National Electric Code
(N.E.C.) is a guideline for safe wiring practices, but
it does not deal with procedures used for electronic
control installation. Use the following procedures for
electronic equipment installation. These procedures are
to be used in conjunction with the N.E.C.

Wire Sizing

Size supply wires one size larger than required for
amperage draw to reduce instantaneous voltage dips
caused by large loads such as heaters, contactors
and solenoids. Sudden dips in voltage can cause the
processor to momentarily malfunction or cause a
complete reset of the control system. If the wire is
loaded to its maximum capacity, the voltage dips are
much larger, and the potential for a malfunction is
very high. If the wire is sized one size larger than
required, the voltage dips are smaller than in a fully
loaded supply wire, and the potential for malfunction
is much lower.

The NEC code requires specic wire sizes to be used
based on current draw. An example would be to use
#14 gauge wire for circuits up to 15 amp or #12 gauge
wire for circuits of up to 20 amp. Therefore, when
connecting the power feed circuit to an electronic
industrial control, use #12 gauge wire for a maximum
current draw of 15 amp and #10 wire for a maximum
current draw of 20 amp.

Voltage Source (Figure 3)

Selecting the voltage source is extremely important
for proper operation of electronic equipment in
an industrial environment. Standard procedure for
electronic instrumentation is to provide a “clean”
separate source voltage in order to prevent EMI, from
other equipment in the plant, from interfering with
the operation of the electronic equipment. Connecting
electronic equipment to a breaker panel (also known as
lighting panels and fuse panels) subjects the electronic
equipment to noise generated by other devices con­nected to the breaker panel. This noise is known as
electromagnetic interference (EMI). EMI ows on
the wires that are common to a circuit. EMI cannot
travel easily through transformers and therefore can
be isolated from selected circuits. Use a control
transformer to isolate the electronic control panel from
other equipment in the plant that generate EMI.

2

15YORK INTERNATIONAL

Installation

equipment in the plant on the same circuits will ground
themselves to the ground stake causing large ground
ow at the electronic equipment.

LD06728

LD06727

FIG. 3 – CONTROL INSTALLATION

Grounding

Grounding is the most important factor for successful
operation. Electronic equipment reacts to very small
currents and must have a good ground in order to
operate properly. The NEC states that control equipment
may be grounded by using the rigid conduit as a
conductor. This is not acceptable for electronic control
equipment. Conduit is a poor conductor compared
to a copper wire. Copper grounds are required for
proper operation.

Ground Wire Size (Figure 4)

The ground wire must be the same size as the supply
wires or one size smaller as a minimum. The three
phase power brought into the plant must also have a
ground wire, making a total of four wires. In many
installations that are having electronic control problems,
this essential wire is usually missing. A good ground
circuit must be continuous from the plant source
transformer to the electronic control panel for proper
operation. Driving a ground stake at the electronic
control will cause additional problems since other

FIG 4 – GROUNDING

Wiring Practices (Figure 5)

Do not mix wires of different voltages in conduit. For
an example refer to Figure 5. The motor voltage is 480
volts and the panel control power is 120 volts. The 480
volt circuit must be run from the motor starter to the
motor in its own conduit. The 120 volt circuit must
be run from the motor starter control transformer to
the control panel in its own separate conduit. If the
two circuits are run in the same conduit, transients on
the 480 volt circuit will be inducted into the 120 volt
circuit causing functional problems with the electronic
control. Dividers must be used in wire way systems
(conduit trays) to separate unlike voltages. The same
rule applies for 120 volt wires and 220 volt wires.
Also, never run low voltage wires in the same conduit
with 120 volt wires.

Never run any wires through an electronic control
panel that do not relate to the function of the panel.
Electronic control panels should never be used as
a junction box. These wires may be carrying large

transients that will interfere with the operation of
the control.

When running conduit to an electronic control panel,
note that the access holes (knockouts) are strategically
placed so that the eld wiring does not interfere with
the electronics in the panel. Never allow eld wiring to

come in close proximity with the controller boards
since this will almost always cause problems.

YORK INTERNATIONAL16

LD06738

FIG. 5 – SEPARATE CONDUIT INSTALLATION

Do not drill a control panel to locate conduit con­nections. Drilling can cause metal chips to land in the

electronics and create a short circuit. If you must drill
the panel, take the following precautions:

1. Call the panel manufacturer, if possible, before
drilling the panel to be sure you are entering the
panel at the right place.

2. Cover the electronics with plastic. Tape the plastic
to the board with masking or electrical tape.

3. Place masking tape or duct tape on the inside of
the panel at the point of drill bit entry.

FORM 50.40-OM2

Never run refrigerant, water or brine tubing inside
an electronic control panel. A leak could damage or in

some cases totally destroy the electronics.

If the electronic control panel has a starter built into
the same panel, be sure to run the higher voltage
wires where indicated by the manufacturer. EMI

from the wires can interfere with the electronics if run
too close to the circuitry.

Never daisy-chain or parallel-connect power or
ground wires to electronic control panels. Each

electronic control panel must have its own supply
wires back to the power source. Multiple electronic
control panels on the same power wires create current
surges in the supply wires which can cause controller
malfunctions. Daisy-chaining ground wires allows
ground loop currents to ow between electronic control
panels which also causes malfunctions. (See Figure 6)

It is very important to read the installation instructions
thoroughly before beginning the project. Make sure you
have drawings and instructions with your equipment.
If not, call the manufacturer and have them send you
the proper instructions. Following correct wiring
procedures will ensure proper installation of your
electronic equipment.

2

4. Remove all of the remaining chips from the panel
before removing the protective plastic.

When routing conduit to the top of an electronic control
panel, condensation must be taken into consideration.
Water can condense in the conduit and run into the panel
causing catastrophic failure. Route the conduit to the
sides or bottom of the panel and use a conduit drain.
If the conduit must be routed to the top of the panel,
use a sealable conduit tting which is poured with a
sealer after the wires have been pulled, terminated and
the control functions have been checked. A conduit

entering the top of the enclosure must have an
“O” ring-type tting between the conduit and the
enclosure, so that if water gets on top of the enclosure,

it cannot run in between the conduit and the enclosure.
This is extremely important in outdoor applications.

Never add relays, starters, timers, transformers,
etc. inside an electronic control panel without rst
contacting the manufacturer. Contact arcing and

EMI emitted from these devices can interfere with the
electronics. If you need to add these devices contact the
manufacturer for the proper device types and placement.

LD06739

LD06740

FIG. 6 – POWER & GROUND WIRE CONNECTIONS

17YORK INTERNATIONAL

Operation

SECTION 3 – OPERATION

OPTIVIEW REMOTE CONTROL CENTER

FIG. 7

The OptiView Remote Control Center display is
highlighted by a full screen graphics display. This
display is nested within a standard keypad, and is
surrounded by “soft” keys which are redened based
on the currently displayed screen. Eight buttons are
available on the right side of the panel, and are primarily
used for navigation between the system screens. At the
base of the display are 5 additional buttons. The area
to the right of the keypad is used for data entry with a
standard numeric keypad provided for entry of system
setpoints and limits.

The Decimal key is used prior to entering
decimal values.

A +/- key has also been provided to allow entry
of negative values and AM/PM selection during
time entry.

00500VIP

In order to accept changes made to the chiller
setpoints, the Check key is provided as a
universal ‘Enter’ key or ‘Accept’’ symbol.

In order to reject entry of a setpoint or dismiss
an entry form, the ‘X’ key is provided as a
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 history and
event logs.

YORK INTERNATIONAL18

SCREEN DESCRIPTIONS AND USAGE

FORM 50.40-OM2

OVERVIEW

The new graphical display on each control panel allows
a wide variety of information to be presented to the
user. Each screen description in this document will
begin with a section entitled Overview which will
describe the graphical elements on the screen and
give a short summary of the functions available. Each
element on the screen will then be categorized into
three distinct groups: Display Only, Programmable, and
Navigation. Below is a short description of what types
of information are included in these groups.

DISPLAY ONLY

Values in this group are read-only parameters of
information about chiller operation. This type of
information may be represented by a numerical value,
a text string, or an LED image. For numerical values, if
the monitored parameter is above the normal operating
range, the high limit value will be displayed along with
the ‘>’ symbol; if it is below the normal operating range,
the low limit value will be displayed along with the
‘<’ symbol. In some cases, the value may be rendered
invalid by other conditions and the display will use
X’s to indicate this.

PROGRAMMABLE

Values in this group are available for change by the
user if the chiller/condensing unit is in remote mode.
If there are no values that can be changed then “None”
is shown.

Setpoint / Change Schedule

On screens containing programmable setpoints, a key
with one of these labels will be visible. This key allows
the user to modify setpoints on that screen.

Setpoints

1. Press the desired setpoint key. A dialog box appears
displaying the present value, the upper and lower
limits of the programmable range, and the default
value.

2. If the dialog box begins with the word “ENTER”,
use the numeric keys to enter the desired value.
Leading zeroes are not necessary. If a decimal point
is necessary, press the ‘•’ key (i.e. 45.0).

Pressing the ▲ key, sets the entry value to the

default for that setpoint. Pressing the ▼ key, clears
the present entry. The ◄ key is a backspace key and
causes the entry point to move back one space.

If the dialog box begins with “SELECT”, use the ◄

and ► keys to select the desired value.

If the previously dened setpoint is desired, press

the ‘X’ (Cancel) key to dismiss the dialog box.

3. Press the ‘ü’ (Enter) key.

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

So m e keys are used to perform manual control
functions. These may initiate/terminate processes
such as a report.

Free Cursor

On screens containing many setpoints, a specic “soft”
key may not be assigned to each setpoint value. A
soft key will be assigned to enable the cursor arrow
keys below the numeric keypad which are used to
“highlight” the desired setpoint eld. At this point,
the ‘ü’ key is pressed to bring up a dialog prompting
the user to enter a new setpoint value. The ‘X’ key
cancels cursor mode. (See “Change Schedule” from
the Setpoints Screen for an example.)

3

Setpoint values are used to control chillers/condensing
units and other devices connected to the units. Setpoints
can fall into several categories. They could be numeric
values (such as 45.0°F for the Leaving Chilled Liquid
Temperature), or they could Enable/Yes or Disable/No
a feature or function.

Regardless of which setpoint is being programmed, the
following procedure applies:

NAVIGATION

In order to maximize the amount of values which the
panel can display to the user, and in order to place
those values in context, multiple screens have been
designed to describe each unit’s operation. In order
to move from one screen to the next, navigation keys
have been dened. These keys allow the user to either

19YORK INTERNATIONAL

Operation

move “forward” to a sub-screen of the present screen,
or move “backward” to the previous screen. Except
for the Home Screen display, the upper-right “soft”
key will always return the user to the Home Screen.
Navigating with “soft” keys is as simple as pressing the
key next to the label containing the name of the desired
screen. The system will immediately refresh the display
with the graphics for that screen. Following is a layout
of all the screens and how they are connected.

Home (page 22)

Unit Data (page 24)

System Data (page 29)

Individual System (page 32)

Hours/Starts (page 34)

Options (page 36)

Trending (page 38)

Trend Setup (page 40)

Setpoints (page 44)

History (page 47)

History Details (page 48)

RCC Setpoints (page 49)

RCC Setup (page 50)

Comms (page 52)

Printer (page 53)

Diagnostics (page 54)

Diagnostics (I/O) (page 55)

Diag. (RCC Comms) (page 56)

FIG. 8 – SCREEN NAVIGATION LAYOUT

This section of the manual will describe each screen
in the order they are accessed as shown in this screen
navigation layout.

YORK INTERNATIONAL20

FORM 50.40-OM2

This page intentionally left blank to maintain formatting

3

21YORK INTERNATIONAL

Operation

HOME SCREEN

FIG. 9 – HOME SCREEN - EXAMPLE

OVERVIEW

When the OptiView Remote Control Center is powered
on, the above default display appears. This screen gives
a general overview of the operating status of each unit
connected to the OptiView Remote Control Center. The
data and control of an individual unit is accessed from
the Home Screen display. Fig. 9 is an example that
shows eight units were programmed.

DISPLAY ONLY

Unit Control Temperature

Displays the temperature of what the unit is using for
control such as leaving chilled liquid temperature.
This is not shown if suction pressure is being used
for control.

Unit Type

Displays the type of chiller the unit is.

Unit Status

Displays a general status message for the unit. The
general status message will include communications
status, running status, and fault status, etc. Following is
a complete listing of the general status messages:

00499VIPC

this message is displayed, the unit’s button will be
disabled, not allowing it to be selected.

• Initializing… will be displayed while the OptiView

Remote Control Center is polling a unit for all
current, schedule, and history data the rst time
after power-up. While this message is displayed,
the unit’s button will be disabled not allowing it
to be selected.

• Loss of Comms will be displayed after 5 minutes

have elapsed with no response from a previously
initialized unit. While this message is displayed,
the unit’s button will be disabled not allowing it
to be selected.

• Running will be displayed when at least 1 system is

running on a unit with no faults on any system. This
message will be displayed even if the chiller is in any
kind of limiting as long as there are no faults present.
While this message is displayed, the unit’s button
will be enabled allowing it to be selected.

• Not Running will be displayed when no systems

on the unit are running for a non-fault reason but
can run when demand requires. This would be
for the No Cool Load state. While this message
is displayed, the unit’s button will be enabled
allowing it to be selected.

• Not Initialized will be displayed upon power-up for

all units until the OptiView Remote Control Center
begins to poll and receive data from that unit. While

• Faulted will be displayed when no systems on

the unit are running and there is a fault on one or
more systems or a unit fault. While this message

YORK INTERNATIONAL22

FORM 50.40-OM2

is displayed, the unit’s button will be enabled
allowing it to be selected.

• Running / Faulted will be displayed when at least

one system on the unit is running and at least one
system is faulted. While this message is displayed,
the unit’s button will be enabled allowing it to
be selected.

• Cannot Run will be displayed for any non-fault

condition preventing the entire chiller from run­ning. This would include such things as the daily
schedule, unit switch, all system switches, run
perm, etc. While this message is displayed, the
unit’s button will be enabled allowing it to be
selected.

Unit Run Indicator (LED)
Is ON when the unit is running.

Average Ambient Temperature

Displays the average Ambient Air Temperature of all
the units connected.

PROGRAMMABLE

None

NAVIGATION

Unit #

A detailed view of data relevant to the specied (#) unit.
If the “Not Initialized” status message is displayed,
the unit’s button will be disabled, not allowing it to
be selected.

Setpoints

This screen provides the gateway to many of the
OptiView Remote Control Center’s general setup
parameters such as Date/Time, Comm Setup, Printer
Setup, etc.

3

23YORK INTERNATIONAL

Operation

UNIT SCREEN - EXAMPLES

FIG. 10A – YCAL CHILLER

00569VIPC

FIG. 10B – YCAR CHILLER

00570VIPC

YORK INTERNATIONAL24

UNIT SCREEN - EXAMPLES

FORM 50.40-OM2

FIG. 10C – YCAS CHILLER

3

00571VIPC

FIG. 10D – YCUL CONDENSING UNIT

00572VIPC

25YORK INTERNATIONAL

UNIT SCREEN - EXAMPLES

FIG. 10E – YCWS CHILLER

00573VIPC

YORK INTERNATIONAL26

UNIT SCREEN

FORM 50.40-OM2

OVERVIEW

This screen is accessed from the Home Screen. The
primary values of the chiller or condensing unit which
must be monitored and controlled are shown on this
screen. The data available depends on the type of unit.
This screen display depicts a visual representation of
the unit itself. Animation indicates chilled liquid ow
and condenser fans running.

DISPLAY ONLY

Systems Statuses

Displays the individual refrigerant systems operational
statuses. The messages displayed include running
status, cooling demand, fault status, external cycling
device status, load limiting, and anti-recycle timer
status. The status message that is displayed on the
microprocessor is represented here.

System Run (LED)

Is ON when the individual refrigerant systems compres-
sor is running. If any of these are ON, the fans will be
animated to show that they are running.

Slide Valve Step (If Screw)

Displays the individual refrigerant systems slide valve
step.

Load Stage (If Recip)

Indicates the number of solenoids on the compressor of
a YCAR unit that are de-energized and loaded.

Return Chilled Liquid Temperature

Displays the temperature of the liquid as it enters
the evaporator.

Discharge Air Temperature

Displays the discharge air temperature leaving the
evaporator when the condensing unit is programmed
for Discharge Air control.

Systems Suction Pressure

Displays the suction pressure for each individual system
on a condensing unit when the unit was programmed
for Suction Pressure control.

Ambient Temperature

Displays the outdoor Ambient Air Temperature.

PROGRAMMABLE

Print

Init i a t e s a printout of current system operating
parameters for the currently selected unit.

Cancel Print

Terminates the printing in process. This key is only
visible while printing is in process.

NAVIGATION

Home

Causes an instant return to the Home Screen.

Number Of Compressors Running (If a system has
more than one)

Displays how many compressors are running on the unit.

System Run Time

Displays the individual refrigerant systems logged run
time since the last compressor start, in days (Days),
hours (Hr), minutes (Min) or seconds (Sec).

Lead System

This message indicates which system is in the lead.

Evaporator Pump Contact (LED)

Is ON when the evaporator pump signal from the
microprocessor is on. If this is ON, the chilled liquid
will be animated to show that it is owing.

Evaporator Heater (LED)
Is ON when the evaporator heater signal from the

microprocessor is on.

Leaving Chilled Liquid Temperature

Displays the temperature of the liquid as it leaves
the evaporator.

System Data
Used to provide additional system information.

Hours/Starts

This screen shows the cumulative operating hours and
start count of each compressor.

Options

Used to provide information of the options that were
programmed at the Unit Control Panel.

Trending

This screen provides the user a view of trending data on
selected parameters of this chiller/condensing unit.

Setpoints

This screen provides a single location to program the
unit setpoints for the selected unit.

History

This screen provides access to a snapshot of system data
at each of the last 4-6 shutdown conditions.

27YORK INTERNATIONAL

Operation

This page intentionally left blank.

YORK INTERNATIONAL28

SYSTEMS SCREEN - EXAMPLES

FORM 50.40-OM2

FIG. 11A – YCAL CHILLER

3

00505VIPC

FIG. 11B – YCAR CHILLER

00506VIPC

29YORK INTERNATIONAL

Operation

SYSTEMS SCREEN - EXAMPLES

FIG. 11C – YCAS CHILLER

00507VIPC

FIG. 11D – YCUL CONDENSING UNIT

00508VIPC

SYSTEMS SCREEN

OVERVIEW

This screen is accessed from the Unit Screen. A chiller
can consist of separate refrigerant circuits. Each
refrigerant circuit is referred to as a system. This
screen shows system specic information for each of
the unit’s refrigerant systems. This information can
vary according to the type of chiller. Reference the
chiller’s Installation, Operation, Maintenance Manual
(IOM) for details.

DISPLAY ONLY

System Status

Displays this refrigerant systems operational status.
The messages displayed include running status, cooling
demand, fault status, external cycling device status,
load limiting, and antirecycle timer status. The status
message that is displayed on the Unit’s microprocessor
is represented here.

System Run (LED)

Displays this refrigerant systems operational status. Is

ON when the system is running.

Locked Out (LED)

Is ON when a system is locked out on a fault requiring
a manual reset at the chiller or condenser unit micro
panel.

System Run Time

Displays the amount of time the system has run.

Compressors Running
(If more than one compressor per circuit)

Indicates the number of compressors running

Load Limit Stage

Indicates which stage of Load Limiting a unit is in.

Load Stage

Indicates the number of solenoids on the compressor of
a YCAR unit that are de-energized and loaded.

Condenser Fan Stage

Displays the stage of condenser fan operation on the
system.

Cooler Inlet Refrigerant temperature (Only if in
R-407c mode)

Displays the refrigerant temperature at the inlet of
the cooler.

Liquid Line Solenoid (LED)

Is ON when the Liquid Line Solenoid Valve is energized/
open.

Economizer Solenoid (LED)

Is ON when the economizer Thermal Expansion Valve
Solenoid is energized/open.

Oil Cooling Solenoid (LED)

Is ON when the Oil Cooling Solenoid Valve is energized/
open.

3

Temperatures and pressures are either measured directly
by transducers and temperature sensors, or computed
from these measurements. Depending on the type of
chiller, the following temperatures and pressures could
be displayed:

• Discharge Pressure • Oil Pressure

• Suction Pressure • Oil Temperature

• Discharge Temperature • Suction Superheat

• Saturated Discharge Temperature

• Discharge Superheat

• Suction Temperature

• Saturated Suction Temperature

Motor Current (%FLA)

This displays the motor current of the system in percent
of full load amps.

Slide Valve Step (If screw)

This indicates the compressor slide valve step.

Compressor Heater (LED)
Is ON when the compressor heater is on.

Hot Gas Bypass (LED)
Is ON when the hot gas bypass valve is open.

PROGRAMMABLE

None

NAVIGATION

Home

Causes an instant return to the Home Screen.

Unit Data

Causes an instant return to the Unit Screen of the
selected unit.

System #

A detailed view of the specied (#) system information.

Operation

INDIVIDUAL SYSTEM SCREEN

FIG. 12A – YCAS CHILLER

00509VIPC

FIG. 12B – YCAR CHILLER

00510VIPC

YORK INTERNATIONAL32

FORM 50.40-OM2

OVERVIEW

This screen is accessible from the SYSTEM screen
when there is much data to view about an individual
system. It displays data only from the selected system.
Reference the chiller’s Installation, Operation, Main­tenance Manual (IOM) for details about the data.
Depending on the type of chiller, the following data
might be displayed:

DISPLAY ONLY

The following system information is displayed at the
top of the screen:
Locked Out (LED)s

System Run Time
System Run (LED)
Liquid Line Solenoid (LED)

The following discharge readings are grouped together
and displayed:

Discharge Pressure
Saturated Discharge Temperature
Discharge Temperature
Discharge Superheat

The following miscellaneous readings are grouped
together and displayed:

Motor Current (%FLA)
Slide Valve Step or Load Stage
Pressure Ratio
Ambient Temperature

The following miscellaneous information is displayed
separately:

Economizer Solenoid (LED)
Hot Gas Bypass Solenoid (LED)
Oil Cooling Solenoid (LED)
Condenser Fan Stage

PROGRAMMABLE

None

3

NAVIGATION

Home

Causes an instant return to the Home Screen.

Unit Data

Causes an instant return to the Unit Screen.

The following suction readings are grouped together
and displayed:

Suction Pressure
Saturated Suction Temperature
Suction Temperature
Suction Superheat

The following oil readings are grouped together and
displayed:

Oil Pressure
Low Differential Oil Pressure
High Differential Oil Pressure
Oil Temperature

System Data

Causes an instant return to the System Screen.

33YORK INTERNATIONAL

Operation

HOURS AND STARTS SCREEN

FIG. 13A – YCAL CHILLER

00511VIPC

FIG. 13B – YCAS CHILLER

00512VIPC

YORK INTERNATIONAL34

FORM 50.40-OM2

OVERVIEW

This screen, accessed from the UNIT screen, displays
the total operating hours and the total number of starts
for all systems on the unit.

DISPLAY ONLY

Total Starts

Displays the number of times the compressor has
been started.

Operating Hours

Displays the number of hours the compressor has
run.

PROGRAMMABLE

None

NAVIGATION

Home

Causes an instant return to the Home Screen.

Unit Data

Causes an instant return to the Unit Screen.

3

35YORK INTERNATIONAL

Operation

OPTIONS SCREEN

FIG. 14A – YCAL CHILLER

00513VIPC

FIG. 14B – YCAS CHILLER / YCAR CHILLER

00514VIPC

YORK INTERNATIONAL36

FORM 50.40-OM2

OVERVIEW

This screen, accessed from the UNIT screen, displays
all the dip switch settings and other programmable
options at the chiller micro panel. These items can only
be changed at the chiller micro panel and not at the
OptiView Control Center. Depending on the type of
chiller, the following data might be displayed:

DISPLAY ONLY

Units Display Mode

The units selected at the OptiView Remote Control
Center, either Imperial or SI, is displayed. In Imperial
Units temperatures will be in °F and pressures will be
in PSIG or PSID. In SI units temperatures will be in °C
and pressures will be in BARG or BARD.

The values at the OptiView Remote
Control Center will be displayed in
the units that are selected on it’s
Setpoints screen regardless of what is
programmed at the chiller/condensing
unit.

Language Display Mode

The language selected at the chiller micro panel (i.e.

English) is displayed.

Lead/Lag Control Mode

The Lead/Lag control at the chiller micro panel is
displayed, either Automatic or Manual. This control
is used to select which compressor starts. See the unit’s
Installation, Operation and Maintenance Manual for
a description.

Fan Control Mode

The fan control at the unit’s micro panel is displayed,
either Discharge Pressure or Ambient and Discharge

Pressure.

Unit Control Mode

What the chiller/condensing unit control is based on
is displayed, either Leaving Liquid, Return Liquid,

Suction Pressure, or Discharge Air Temperature.

Unit Software Version

The software version of the EPROMS at the chiller/
condensing unit’s micro panel .

3

Refrigerant Type

The refrigerant, either R-407C or R-22, selected at the
chiller micro panel is displayed.

Chilled Liquid Type

The cooling mode, either Water or Glycol, selected at
the chiller micro panel is displayed.

Ambient Control Mode

The ambient mode, either Standard or Low Ambient,
selected at the chiller micro panel is displayed.

Local/Remote Control Mode

The control mode selected at the chiller micro panel,
either Local or Remote, is displayed.

PROGRAMMABLE

None

NAVIGATION

Home

Causes an instant return to the Home Screen.

Unit Data

Causes an instant return to the Unit Screen.

37YORK INTERNATIONAL

Operation

TRENDING SCREEN

FIG. 15 TRENDING

OVERVIEW

This screen is accessed from the UNIT screen. As many
as six Operator selected parameters can be plotted in
an X/Y graph format. The X-Axis is scaled per the
selected Data Collection Interval and displayed in a
time of day or elapsed time format, as selected with
the X-axis toggle key. The Y-Axis is scaled for each
parameter per the selected minimum and maximum
value for each parameter. Analog parameters are scaled
in pressure, temperature, volts, amps, hertz or time.
Digital on/off parameters are scaled as zero (off) and
one (on). Only one Y-Axis label is displayed at a time.
The Y-Axis Toggle Key is used to toggle the Y-Axis
labels through the different parameters. The Y-Axis
label that is being displayed is identied at the top of the
graph. All parameters are displayed simultaneously. For
identication, each plotted parameter and associated
Y-Axis labeling is color coordinated.

The parameters are sampled at the selected Data
Collection Interval and plotted using 450 data points
across the X-Axis. If the actual value of the sampled
parameter is less than the Y-Axis label minimum for
that parameter, the value will be plotted at the minimum
value. Similarly, if the actual value is greater than the
Y-Axis label maximum for that parameter, the value
will be plotted at the maximum value.

00574VIPC

There are two types of charts that can be created: ONE
SCREEN or CONTINUOUS. When the plotting has
reached the end of the X-Axis, one of the following
will occur, depending on which is selected: If ONE
SCREEN has been selected, the trending stops and the
data is frozen. If CONTINUOUS has been selected,
the oldest data is dropped from the left-hand side of the
graph at the next Data Collection Interval. Thereafter,
the oldest data is dropped from left-hand side of the
graph at each Data Collection Interval.

Only parameters from the selected Unit are trended.
The same parameters that have been selected for a Unit,
will be selected by default for the next selected Unit.
When on the Home screen, a Unit is not selected and
any trending is stopped. Trending is also stopped if a
power failure occurs while it is running. After trending
is stopped, the last screen of data that was collected will
be displayed on the trending screen and the START key
must be pressed to initiate a new trend screen.

DISPLAY ONLY

This screen allows the user to view the graphical
trending of the selected parameters and is also a
gateway to the graph setup screens.

YORK INTERNATIONAL38

FORM 50.40-OM2

A red screen with the words “TREND
MAX MUST BE > TREND MIN”
will appear if the Y-Axis minimum
has been programmed to a value that
is greater than the Y-Axis maximum
for any parameter. If this appears,
proceed to the Trend Setup Screen to

change the values.

PROGRAMMABLE

Start

Pressing this key clears the graph, starts a new graph
and begins the trending. The trending will continue
until the STOP key is pressed, the Home screen is
displayed, or a power failure occurs. This key is only
available if trending is stopped.

Stop

Pressing this key stops the trending. The trend data
is frozen on the display until another graph is started
with the START key. The Stop key is only available
if trending is running.

X-Axis

This key toggles the X-Axis labels of the graph.
Each key press alternates the scaling between time of
day and elapsed time. The Time of Day scaling is in
24-hour format. The Elapsed Time scaling is the time
elapsed since the START key was pressed, starting
the trending.

NAVIGATION

Home

Causes a return to the Home Screen.

Unit Data

Causes a return to the Unit Screen.

Trend Setup

Only displayed if the trending is stopped. Causes
a jump to a sub-screen for conguring the trending
display.

3

Y-Axis

This key toggles the Y-Axis labels of the graph. Each
key press changes the label to another of the selected
parameters.

39YORK INTERNATIONAL

Operation

TREND SETUP SCREEN

FIG. 16 TREND SETUP

OVERVIEW

This screen is accessed from the Trending screen.
This screen is used to congure the trending screen.
The parameters to be trended are selected from the
Common Slots Screen or Common Slots Master list
and entered as Slot Numbers for Data Points 1 through

6. The Y-Axis minimum and maximum values for each
parameter are entered as Data Point Min and Data Point
Max for Data Points 1 through 6. The interval at which
all the parameters are sampled is selected as the Data
Collection Interval.

DISPLAY ONLY

None

PROGRAMMABLE

Chart Type

Selects either CONTINUOUS or ONE SCREEN type
of graph.

Collection Interval

Selects the interval at which the parameters are sampled.
There are 450 data points displayed across the X-Axis
of the graph. Each point represents the instantaneous
value of the parameter. The user selects the time
interval between these points. This is called the DATA

00575VIPC

COLLECTION INTERVAL, or the interval at which
the parameter is sampled. This interval is programmable
over the range of 1 second to 3600 seconds (1 hour), in
one second increments. The selected interval not only
determines the sample interval, but also the full screen
time display. The full screen time display is a result
of the selected interval in seconds, multiplied by the 450
data points. For example, if the Data Collection Interval
is programmed for 900 seconds, the parameter would
be sampled every 900 seconds, with the last 112.5 hours
(4.7 days) of data viewable on the screen. Therefore, the
selected interval is a compromise between resolution
and full screen time display. Select the desired Data
Collection Interval as follows:

1. Determine the desired time interval (in seconds),
between data samples.

2. Calculate the full screen time display as follows:

• 450 x Data Collection Interval = full screen

seconds

• full screen seconds / 60 = full screen minutes

• full screen minutes / 60 = full screen hours

• full screen hours / 24 = full screen days

3. Decide if the resultant sample interval and full
screen display meet the requirements. If not, select
a different sample interval.

YORK INTERNATIONAL40

FORM 50.40-OM2

Select

This key is used to enter the slot numbers and the
minimum and maximum Y-Axis values of each param­eter to be trended. Pressing this key places a yellow
box around Data Point 1 Slot Number. Use the ▲ and
▼ navigation keys to place the box around the value of
Data Points 1 through 6 to be changed. With the desired
value selected, press the ‘4’ (Enter) key. A dialog box
is displayed permitting data entry.

Data Point Slot # (1-6)

Use the SELECT key as described above and enter
the slot number from the Trend Common Slots Screen
of the desired parameter to be trended. The selected
parameter description will be displayed for the Data
Point. Setting this slot number to zero will disable
trending for that particular Data Point. Any or all points
can be disabled.

Data Point Min (1-6)

Only displayed if the Associated Slot Number is not
Zero. This is the minimum value displayed for the
Y-Axis. Selecting a parameter for a Data Point sets
this to the default value, which is the lowest value
allowed for that parameter. It can be changed to a
value that provides a more appropriate resolution for
the parameter being monitored. To change, use the
SELECT key as described above and enter the desired
value. The value must always be set to a value less
than the Data Point Max. Otherwise, a red graph is
displayed on the Trend Screen with the words “TREND
MAX MUST BE > TREND MIN”. If the parameter
selected for this data point is a digital type (on/off),
this value must be set to zero (0). Zero indicates the
OFF state.

Data Point Max (1-6)

Only displayed if the associated slot number is not zero.
This is the maximum value displayed for the Y-Axis.
Selecting a parameter for a Data Point sets this to the
default value, which is the highest value allowed for that
parameter. It can be changed to a value that provides a more
appropriate resolution for the parameter being monitored.
To change, use the SELECT key as described above and
enter the desired value. The value must always be set to
a value greater than the Data Point Min. Otherwise, a red
graph is displayed on the Trend Screen with the words
“TREND MAX MUST BE > TREND MIN”. There are
20 Y-axis divisions. If a MIN-MAX span is selected that is
not evenly divided by 20, the Program will automatically
select the next higher MAX value that makes the span
evenly divided by 20. For example, if 0.0 is selected as
the MIN, and 69.0 as the MAX, the Program will insert

70.0 as the MAX value. If the parameter selected for this
data point is a digital type (on/off), this value must be set
to one (1). One indicates the on state.

3

NAVIGATION

Home

Causes a return to the Home Screen.

Unit Data

Causes a return to the Unit Screen.

Trending

Causes a return to the Trending Screen.

Slot Numbers

Causes a jump to the Trend Common Slots Screen.
The slot numbers of the most commonly monitored
parameters are listed on this screen. The parameters
are arranged to make it easier to nd the slot number
of the desired parameter to plot.

41YORK INTERNATIONAL

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YORK INTERNATIONAL42

FORM 50.40-OM2

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43YORK INTERNATIONAL

Operation

SETPOINTS SCREEN - EXAMPLES

FIG. 17A – YCAL CHILLER

00515VIPC

FIG. 17B – YCAS CHILLER

00516VIPC

YORK INTERNATIONAL44

FORM 50.40-OM2

FIG. 17C – YCAR CHILLER

00517VIPC

3

45YORK INTERNATIONAL

Operation

SETPOINTS SCREEN

OVERVIEW

This screen, accessed from the Unit screen, provides a
convenient location for programming the most common
setpoints involved in the chiller/condensing unit control.
The setpoints depend on the type of unit.

Values on this screen are only pro­grammable if the chiller/condensing
unit is in remote control mode. These
values are only viewable if the unit is
in local mode.

DISPLAY ONLY

None

PROGRAMMABLE

Leaving Chilled Liquid Temperature or
Return Chilled Liquid Temperature or Suction
Pressure or Discharge Air Temperature Setpoint

This value allows the user to dene the cooling setpoint
that is to be maintained by the chiller/condensing unit.
See the unit’s Installation, Operation and Maintenance
Manual (IOM) for it’s programmable range.

Leaving Chilled Liquid Temperature or Return
Chilled Liquid Temperature or Suction Pressure or
Discharge Air Temperature - Control Range

This is the maximum allowable positive and negative
deviation that is acceptable from setpoint in the system
application. See the unit’s Installation, Operation and
Maintenance Manual (IOM) for it’s programmable
range.

Remote Chiller Run or Remote Unit Run

The chiller/condensing unit can be selected to either
Run or Stop . Selecting Stop will command the
chiller/condensing unit to shut down. Selecting Run
will allow the chiller/condensing unit to turn on.

Current Limit Setpoint

This is the motor current limiting setpoint. The chiller
will be limited from loading when the motor current
equals or exceeds this value. Typically, for most instal­lations, no limiting is required and the programmed
limiting will be set at or above 100%.

Load Limit Setpoint (YCAL Chillers)

Load Limiting can be programmed from 0 to 2.
Load Limit 0 = no load limit
Load Limit 1 = 50% load limit - 2/4 compressor units.
Load Limit 1 = 66% load limit - 3/6 compressor units.
Load Limit 2 = 33 % - 3/6 compressor units only.

Change Schedule

The daily schedule is a 1 week schedule and must
be programmed for the start and stop time for each
week day and a holiday if desired. A box is provided to
specify which days are to use the holiday schedule.

Programming the same time for both
Start and Stop times will cause the
display to enter 00.00 for both times
which will cause the chiller to always
be allowed to run.

Repeat Monday

The other days can be selected to change to the Monday
schedule.

Clear Schedule

In a situation where it is required to run the chiller
24 hours a day, 7 days a week, the Chiller Control
panel should rst have its entire Daily Schedule zeroed
(00.00) for all Start and Stop times. This puts the chiller
in the run mode at all times. The OptiView Remote
Control Center may now be programmed with all
zeroes (00.00) for all Start and Stop times by pressing
the Clear Schedule button. Since the chiller panel is
already in the run mode, programming the OptiView
Remote Control Center for all zeroes will keep the
chiller in this mode indenitely, allowing the chiller to
run whenever demand requires.

NAVIGATION

Home

Causes an instant return to the Home Screen.

Unit Data

Causes an instant return to the Unit Screen.

YORK INTERNATIONAL46

HISTORY SCREEN

FORM 50.40-OM2

FIG. 18

OVERVIEW

This screen allows the user to browse through the faults.
In order to get a more thorough reporting of the system
conditions at the time of the recorded shutdown, move
to the sub-screen HISTORY DETAILS.

The user may use the Select Fault button to select
the history to view. At this point the View Details
button is used to jump to a sub-screen containing stored
chiller parameters values at the time of the shutdown.
Additionally, the Print History button can be used to
generate a hard-copy report of the parameter values at
the time of the shutdown.

DISPLAY ONLY

Last Faults

This window displays a chronological listing (most
recent rst) of the date and time and the description
of the last four to six safety shutdowns (depending
upon the type of chiller) that occurred while the system
was running.

3

00518VIPC

PROGRAMMABLE

Print History

This generates a report listing the status of the chiller
parameters at the time of the selected shutdown.

Print All Histories

This generates a report listing the status of the chiller
parameters at the time of each of the stored shutdowns.

Cancel Print

Terminates the printing in process. This key is only
visible while printing is in process.

NAVIGATION

Home

Causes an instant return to the Home Screen.

Unit Data

Causes an instant return to the Unit Screen.

View Details

Causes a move to a sub-screen containing the value of
select chiller parameters at the time of the associated
shutdown.

47YORK INTERNATIONAL

Operation

HISTORY DETAILS SCREEN

FIG. 19

OVERVIEW

This screen allows the user to see an on-screen printout
of all the system parameters at the time of the selected
shutdown. Not all screens are shown above. The number
of screens required to display all of the data varies
according to the type of unit selected.

DISPLAY ONLY

History Printout

This is the on-screen printout of the system param­eters.

PROGRAMMABLE

Page Up

Scroll up in the displayed data (if applicable).

00519VIPC

NAVIGATION

Home

Causes an instant return to the Home Screen.

Unit Data

Causes an instant return to the Unit Screen.

History

Causes a return to the History Screen.

Page Down

Scroll down in the displayed data (if applicable).

YORK INTERNATIONAL48

RCC SETPOINTS SCREEN

FORM 50.40-OM2

FIG. 20

OVERVIEW

This screen is accessed from the Home Screen.
This screen shows conguration parameters for this
OptiView Remote Control Center. This screen also
serves as a gateway to more sub-screens for dening
general system parameters.

DISPLAY ONLY

None

PROGRAMMABLE

Number of Units Connected

Allows the user to program how many units the Control
Center will need to communicate to.

3

00520VIPC

NAVIGATION

Home

Causes an instant return to the Home Screen.

Setup

This screen provides a single location to program the
general system setup parameters such as Date/Time.
It is also the gateway to many of the general system
setup parameters such as Communications, Printer
Setup, etc.

49YORK INTERNATIONAL

Operation

RCC SETUP SCREEN

FIG. 21

OVERVIEW

Th i s screen is accessed from the RCC Setpoint
Screen. This screen shows the general conguration
parameters for this OptiView Remote Control Center.
It allows programming of the time and date, along with
specications as to how the time will be displayed
(12 or 24 hour format). This time is used for display
purposes on the OptiView Remote Control Center. It
is not used to reset individual chiller clocks and has no
effect on individual chiller schedules. This screen also
serves as a gateway to more sub-screens for dening
general RCC system parameters.

DISPLAY ONLY

None

PROGRAMMABLE

00521VIPC

Set Date

Allows the user to specify the present date. When
prompted to enter a date value, the user must enter the
day, month, and four-digit year (using leading zeroes as
necessary). If within range, the value will be accepted.
If out of range, the user is prompted for the information
again. At this point the user may retry the date entry, or
cancel the programming attempt.

Set Time

Allows the user to specify the present time. When
prompted to enter a time value, the user must enter
the hour and minute desired (using leading zeroes as
necessary). If the chiller is presently set to 24-hour
mode, the time must be entered in the 24-hour format.
Otherwise, the user must also select AM or PM for the
entered time. If out of range, the user is prompted for
the information again. At this point the user may retry
the time entry, or cancel the programming attempt.

Clock (Enabled / Disabled)

Allows the user to enable or disable the real-time clock
in order to conserve battery life. The clock will be
disabled during manufacturing and must be enabled at
system commissioning. In addition, when preparing
for prolonged shutdown the clock should once again be
disabled.

12/24 Hr

Allows the user to specify the format in which the time
will be presented to the user. This setpoint will only affect
the display of the time on the OptiView RCC panel and
on all reports generated. 12-Hour time format will include
the AM and PM modiers and show the range of time
between 1:00 and 12:59, while the 24-Hour time format
will show the range of time between 0:00 and 23:59.

YORK INTERNATIONAL50

FORM 50.40-OM2

Units

Dene the unit system (Imperial or SI) used by the
OptiView RCC display. This selection has no effect on
the chiller/condensing unit micro panel.

NAVIGATION

Home

Causes an instant return to the Home Screen.

Setpoints

Causes a return to the Setpoints Screen.

Comms

Moves to the sub-screen allowing configuration of
system communications.

Printer

Moves to the sub-screen allowing conguration and
control of printer functions.

Diagnostics

Moves to the sub-screen allowing limited diagnostic
capability while operating.

3

51YORK INTERNATIONAL

Operation

COMMS SCREEN

FIG. 22

OVERVIEW

This screen is accessed from the RCC Setup Screen.
This screen allows denition of the necessary com­munications parameters. Refer to PRINTER Section
of this book for details of the Printer connections
and setup.

DISPLAY ONLY

RS-485 Baud Rate 4800

Shows the baud rate at which the panel shall com­municate through the Com3 port to the remote control
panel(s). The baud rate of the remote control panel(s)
must be set for 4800 in the EPROM. Make sure the
correct EPROM is installed at the chiller/condenser
control panel(s). See Table 1.

00522VIPC

PROGRAMMABLE

RCC Poll Time (5-30 sec.)

Dene the poll time (how frequently) this panel requests
for data from another panel through the Com3 port.

NAVIGATION

Home

Causes an instant return to the Home Screen.

Setup

Return to the Setup Screen.

YORK INTERNATIONAL52

PRINTER SCREEN

FORM 50.40-OM2

FIG. 23

OVERVIEW

This screen is accessed from the RCC Setup Screen.
This screen allows denition of the necessary com­munications parameters for the printer. Refer to
PRINTER section of this book for details of the Printer
connections and setup.

DISPLAY ONLY

None.

PROGRAMMABLE

Automatic Printer Logging (Enabled / Disabled)

Enable the printer to begin printing status reports
beginning at the programmed start time and recurring
at the interval dened above.

3

00523VIPC

Printer Type

Dene the printer type connected to the OptiView RCC.

Printer Baud Rate

Dene the baud rate at which the panel shall com­municate to the printer.

Printer Data Bit(s)

Dene the number of data bits with which the panel
shall communicate to the printer.

Printer Parity Bit(s)

Dene the number of parity bits with which the panel
shall communicate to the printer.

Printer Stop Bit(s)

Dene the number of stop bits with which the panel
shall communicate to the printer.

Log Start Time

Set the time at which scheduled logs will begin.

Log Output Interval

Dene the interval at which logging will occur. We
suggest you select a reasonable amount of time so that
it is not occurring too much.

Log Unit Selected

Select a unit or all units to logs of.

Cancel Print

Terminates the printing in process. This key is only
visible while printing is in process.

NAVIGATION

Home

Causes an instant return to the Home Screen.

Setup

Return to the Setup Screen.

53YORK INTERNATIONAL

Operation

DIAGNOSTICS SCREEN

FIG. 24

OVERVIEW

This screen is accessed from the RCC Setup Screen.
This screen provides a view of what software is in use
and provides access to a screen for troubleshooting
analog and digital inputs.

DISPLAY ONLY

Software Versions

The following software versions are displayed:

• RCC - FLASH Memory Card on Microboard

• BIOS - BIOS EPROM on Microboard

• Kernel - Software that is part of FLASH Memory
Card

• GUI - Software that is part of FLASH Memory
Card

• SIO - Software that is part of FLASH Memory
Card

00524VIPC

PROGRAMMABLE

None

NAVIGATION

Home
Causes an instant return to the Home Screen.

Setup

Return to the Setup Screen.

I/O

Moves to the sub-screen allowing diagnostics of the
analog and digital inputs.

RCC Comms

Moves to the sub-screen allowing diagnostics of
communications with the RCC.

YORK INTERNATIONAL54

DIAGNOSTICS I/O SCREEN

FORM 50.40-OM2

FIG. 25

OVERVIEW

This screen is accessed from the Diagnostics Screen.
This screen provides a view of the analog and digital
inputs for troubleshooting .

DISPLAY ONLY

Diagnostics is used to analyze the Analog Inputs at the
Microboard. The voltage level of each Analog Input, as
interpreted by the Microboard, is displayed. “Counts”
is an Analog-to-Digital (A/D) converter value and is for
manufacturing and engineering use only.

Diagnostics is also used to analyze the state of each
Microboard Program Jumper and Program DIP Switch
as interpreted by the Microboard. These are depicted
by an LED.

00525VIPC

3

2. If a Program Jumper is present, the applicable
LED should be extinguished. If the LED is not
extinguished, the Microboard is defective.

3. If a Program Jumper is not present, the applicable
LED should be illuminated. If the LED is not
illuminated, the Microboard is defective.

4. If a Program Switch (DIP) is in the ON position, the
applicable LED should be illuminated. If the LED is
not illuminated, the Microboard is defective.

5. If the Program Switch (DIP) is in the OFF position,
the applicable LED should be extinguished. If
the LED is not extinguished, the Microboard is
defective.

6. When all desired tes t s have been per f ormed,
press DIAGNOSTICS key to return to MAIN
DIAGNOSTICS Screen.

PROGRAMMABLE

PROCEDURE

Digital Inputs:

1. The Digital Inputs are listed on this screen according
to a.) Microboard Program Jumpers and Program
DIP Switches. Tables 2 and 3 list the functions of
the Program Jumpers and Switches.

None

NAVIGATION

Home

Causes an instant return to the Home Screen.

Diagnostics

Causes a return to the previous screen.

55YORK INTERNATIONAL

Operation

DIAGNOSTICS RCC COMMS SCREEN

FIG. 26

OVERVIEW

This screen is accessed from the Diagnostics Screen.
This screen provides a view of communication for
troubleshooting .

Communication between the OptiView RCC and the
chiller/condenser control panel(s) should consist of
the RCC polling (requesting a response from) each
chiller/condenser control panel starting with Unit 1
and continuing to Unit “x”, where “x” is the Number
of Units Connected as entered on the RCC Setpoints
Screen. Each poll will increment the Poll Count. A
reply should be sent back to the RCC from the Unit that
was polled within a certain amount of time. If this reply
does not happen within this time period the Timeout
Count will be incremented. If the reply is returned but
contains improper data, then the Bad Csum Count will
be incremented. If the reply is successfully received by
the RCC then the Reply Count is incremented.

00526VIPC

DISPLAY ONLY

Unit Type

Displays the chiller type, whether it is a “Screw”,
“Recip”, or Scroll” and the number of compressors for
the “Unit x”, where x is the number of the unit.

Poll Indicator (LED)

Is on when the last noted communication through the
Com3 port was to poll a chiller/condenser control
panel.

Reply Indicator (LED)

Is on when the last noted communication through
the Com3 port was to receive a reply from a chiller/
condenser control panel.

Poll Count

A count of each poll request through the Com3 port to
a chiller/condenser control panel.

Good communication is indicated by the Poll Count
and the Reply Count keeping close to the same
count. A high Timeout Count could imply that the
chiller/condenser control panel did not properly receive
the request or it did not properly send a response.
Check the wiring and the Installation Checklist. A high
Bad Csum Count could be indicative of noise being
transmitted. This can happen because of improper
wiring or grounding.

Reply Count

A count of each reply successfully received through the
Com3 port from a chiller/condenser control panel.

Bad Csum Count

A count of each reply received through the Com3 port
from a chiller/condenser control panel that had a bad
Csum calculation. This indicates that improper data
was received.

YORK INTERNATIONAL56

FORM 50.40-OM2

Timeout Count

A count of each poll request through the Com3 port
to a chiller/condenser control panel that did not get
a reply within the timeout period (time to wait for
a reply).

PROGRAMMABLE

Clear Counters

Resets all the counts to zero.

NAVIGATION

Home

Causes an instant return to the Home Screen.

Diagnostics

Causes a return to the previous screen.

3

57YORK INTERNATIONAL

Operation

DISPLAY MESSAGES

A title bar will be displayed on all screens. This title
bar will contain the OptiView Remote Control Center
date and time on all RCC screens. This title bar will
contain the Chiller/Condensing unit’s date and time on
all unit screens. On the Home Screen the message will
read “YORK REMOTE CONTROL CENTER”. On
all other screens it will contain the unit selected and
either the chiller type or will be based on the number
of compressors of that unit.

When a unit has been selected the title bar will display
a dual message on every screen. The rst message
will display the Unit Selected in the format “Unit x”,
where x is the number (1 – 8) of the unit selected. The
second message will display the chiller type, whether
it is a “Screw”, “Recip” or “Scroll” and the number
of compressors.

On the Unit Screen and all System Screens the title bar
contains another message called a Status. The current
status of each unit is displayed in this message. These
messages will include running status, cooling demand,
fault status, external cycling device status, load limiting
and anti-recycle timer status, etc. A System Status
message and a Unit Status message are never displayed
simultaneously. A single message is displayed for a
Unit Status message, while a separate System Status
message will display for each system on multi-circuit
units.

Status messages fall into the categories of warning,
safety, and normal with each of the categories discussed
following:

• Warning messages are denoted by yellow message

text. A warning message is shown for any special
running condition and for all unit warnings.
Any kind of load limiting would be an example
of a warning message. An incorrect refrigerant
programmed warning would also be an example
of a warning message.

• Safety messages are denoted by red message text.

A safety message is shown for any type of safety
shutdown, lock-out, or run inhibit. High discharge
pressure would be an example of a safety shutdown
message.

• Normal messages are denoted by green text.

A normal message is shown for any non-fault
normal condition. The compressor running and
no cooling load messages would be examples of
normal messages.

Note that there are two types of shutdowns. If the
chiller shuts down on a SAFETY shutdown, it requires
the operator to perform a manual reset at the keypad. A
NORMAL shutdown occurs from a properly requested
or scheduled shutdown. The event that caused the
shutdown is displayed on the Status Line.

STATUS MESSAGES

Status messages will be much like those displayed at
the chiller panel. Explanation of these displays will be
outlined in the Installation Manual for each specic
chiller. Subtle differences may be noted in the exact
wording displayed versus the display which is shown
on the chiller panel. An example of this is apparent
in the anti-recycle and anti-coincidence timers. In
the case of these messages, the chiller control panel
indicates actual time left on the timers. The OptiView
Remote Control Center will only indicate that the
timers are “Active”.

The new message “Loss of Communications” indicates
that the communications link between the chiller
control panel and the OptiView Remote Control Center
has been lost. This loss of communications is normally
a result of disconnecting the RS-485 communications
cable between the two panels or the loss of power to
the chiller control panel.

If communications is lost and not re-established, local
chiller setpoints will command chiller control after
5 minutes.

In addition to the chiller status messages there are
the Optiview Remote Control Center general status
messages that are displayed on a single line on the
Home Screen for each chiller. See the description of
the Home Screen in this manual.

SAFETY SHUTDOWN MESSAGE

“WATCHDOG – SOFTWARE REBOOT”

The Microboard’s software Watchdog initiated a
Microprocessor reset because it detected that a portion
of the chiller operating Program was not being executed.
The result of this reset is a Safety shutdown and
re-initialization of the Program. This is generally
indicative of a severe electrical power disturbance
or impending Microboard Failure. The chiller can be
started after the COMPRESSOR switch is placed in
the Stop-Reset (O) position.

YORK INTERNATIONAL58

OKIDATA MICROLINE 184

FORM 50.40-OM2

SECTION 4 – PRINTERS

23887A

SEIKO DPU-414

4

23889A

WEIGH-TRONIX

00085VIP

FIG. 27 – PRINTERS

59YORK INTERNATIONAL

Printers

PRINTERS

A printer can be connected to the OptiView Remote
Control Center’s Microboard to print the following
reports. The screen from which each report can be
generated is listed in parenthesis.

• Operating Data - Present system parameters
(Unit)

• History - System parameters at the time of the
last fault while running and last saved faults
(History)

The printer can be permanently connected to the Remote
Control Center or connected as required to produce a
report. If permanently connected, a DATA LOGGING
feature can produce a Status report automatically,
beginning at an Operator selected start time and occurring
at an Operator selected interval thereafter.

The following gures are examples of the different
print reports.

• Figure 28 - Operating Data

• Figure 29 - History (Header)

PRINTERS

The following Printers can be used. Printers must be
equipped with an RS-232 Serial interface.

• Okidata –

Models: 182,182 turbo, 184 turbo
Dimensions: 14 in. wide x 10.5 in. deep
Paper: 8.5 in. wide
Type: Dot matrix impact

• Weigh-Tronix –

Models: 2600, 1220
Dimensions: 2.3 in. wide x 2.8 in. deep
Paper: 2.25 in. wide
Type: Dot matrix impact

• Seiko –

Model: DPU414-30B (Power supply PW4007-U

I required)

Dimensions: 6.3 in. wide x 6.7 in. deep
Paper: 4.4 in. wide
Type: Thermal

Purchase: Contact your local
YORK Service Ofce

The OptiView Remote Control Center provides the
required formatting control codes for the printers above

when the printer is selected on the PRINTER Screen
in the instructions below. These codes are transmitted
through the serial interface to the printer to provide a
proper print format. Different printers require different
formatting control codes. Other printers might provide
proper operation when connected to the OptiView
Remote Control Center. However, the print format
may not be correct or as desired. Proceed with caution
and use the following guidelines if an unlisted printer
is selected:

1. All must be capable of RS-232 Serial communications.

2. Primary differences between printers involve the
formatting control codes required by the printer.
These codes are sent from the Control Center to
the printer. For example, Weigh-Tronix printers
require a control code to select 40 column width.
This same code is interpreted by the Okidata printer
as an instruction to print wide characters. In some
instances, a printer will ignore a code it cannot
interpret.

3. The OptiView Remote Control Center requires
a busy signal from the printer when the printer
receive buffer is full. This causes the OptiView
Remote Control Center to momentarily terminate
data transmission until the printer can accept more
data. The busy signal polarity must be asserted
low when busy.

PRINTER CONNECTIONS

Connect the printers to the Control Center Microboard as
follows. Only one printer can be connected at a time.

• OKIDATA 182, 182 turbo, 184 turbo

Microboard Printer Function

J2-4 pin 3 Tx (data to printer)
J2-2 pin 11 DSR (busy signal from printer)
J2-9 pin 7 Gnd
Cabinet shield

• WEIGH-TRONIX

Microboard Printer Function
J2-4 pin 2 Tx (data to printer)
J2-2 pin 5 DSR (busy signal from printer)
J2-9 pin 7 Gnd

Cabinet shield

YORK INTERNATIONAL60

FORM 50.40-OM2

• SEIKO

Microboard Printer Function
J2-4 pin 3 Tx (data to printer)
J2-2 pin 8 DSR (busy signal from printer)
J2-9 pin 5 Gnd

Cabinet shield

Hardware required:

Cable – #18 AWG stranded 50ft. maximum length.

Connectors –

- Microboard: None. Strip 1/4" insulation from wire
and insert into screw terminal block.

- Printers: Okidata - 25 pin plug DB-25P or equiva­lent; Shell DB-C2-J9 or equivalent. Weigh-Tronix

- Same as Okidata. Cable assembly available from
Weigh-Tronix. Seiko - 9-Pin D-type Subminiature
(DB-9 pin male).

PRINTER SETUP

The selected printer must be congured as follows.
Refer to manual provided by Printer manufacturer with
respective Printer.

• OKIDATA 182, 182 turbo, 184 turbo Printer

CONTROL BOARD Switch settings:
SW1 - on Unslashed 0
2 - off Unslashed 0
3 - off Unslashed 0
4 - off Form Length 11 in.
5 - on Form Length 11 in.
6 - off Auto Line Feed off
7 - on 8 bit data
8 - off Enable front panel

If equipped with a SUPER SPEED serial Board:
SW1-1 - on Odd or even parity
1-2 - on No parity
1-3 - on 8 bit data
1-4 - on Protocol ready/busy
1-5 - on Test select
1-6 - on Print mode
1-7 - off SDD(-) pin 11
1-8 - on SDD(-) pin 11
2-1 - on 1200 Baud*
2-2 - on 1200 Baud*
2-3 - off 1200 Baud*
2-4 - off DSR active

2-5 - on Buffer threshold 32 bytes
2-6 - on Busy signal 200ms
2-7 - on DTR space after power on
2-8 - not used

If equipped with HIGH SPEED serial board:
SW1 - off (-) Low when busy
2 - off 1200 Baud*
3 - off 1200 Baud*
4 - on 1200 Baud*
5 - not used
6 - off no parity
7 - off Pin 20 & pin 11 act as busy line

• WEIGH-TRONIX Printer

- IMP-24 Model 2600
SW1 - off 1200 Baud*
2 - on 1200 Baud*

Model 1220

- Congure Menu
Baud= 1200
Data Bits = 8
Stop Bits = 1
Hshake = Busy-Line
Cols = 32
Invert = No
Font = 5 x 8
Mag = None

- Custom Menu
Auto Seq = No
Zero = 0
Pound sign = #
_(Underscore)
Busy invert = no
Online/ofine = yes
Ext Ch Set = no
Print ready = yes

Set Clock = not used
Reset Seq = not used

• SEIKO

DipSW1-1 = off Input-Serial
1-2 = on Printing speed high
1-3 = on Auto loading - on
1-4 = off Auto LF - off
1-5 = on Setting Command - Enable
1-6 = off Printing density - 100%
1-7 = on Printing density - 100%
1-8 = on Printing, density - 100%

4

61YORK INTERNATIONAL

Printers

DipSW 2-1= on Printing Columns - 40
2-2 = on User Font Back-up - on
2-3 = on Character Select - normal
2-4 = off Zero - slash
2-5 = on International character set -

American
2-6 = on International character set -

American
2-7 = on International character set -

American
2-8 = off International character set -

American

DipSW 3-1= on Data length - 8 bits
3-2 = on Parity Setting - no
3-3 = on Parity condition - odd
3-4 = on Busy control - H/W busy
3-5 = on Baud rate select - 1200*
3-6 = off Baud rate select - 1200*
3-7 = on Baud rate select - 1200*
3-8 = off Baud rate select - 1200*

* Settings shown for 1200 Baud. Other Baud rates can
be selected. Refer to Printer manufacturer’s manual
supplied with Printer.

OPTIVIEW REMOTE

CONTROL CENTER SETUP

Printer Type

Using the PRINTER Screen, the actual Printer type
connected to the OptiView Remote Control Center
must be entered. Selection determines the control codes
that are sent to the Printer. These codes determine
such things as lines per inch, character width and
general formatting. Available selections are: Okidata,
Weigh-Tronix and Seiko.

Automatic Data Logging

If automatic data logging is desired, a Status Report
can be automatically printed at a specied interval
beginning at a specified time, using the PRINTER
Screen. The interval is programmable over the range of
1 minute to 1440 minutes in 1 minute increments. The
rst print will occur at the programmed START time
and occur at the programmed OUTPUT INTERVAL
thereafter. The time remaining until the next print is
displayed on the PRINTER Screen.

• Automatic Printer Logging - Enables and disables
automatic data logging

• Log Start Time - Enter the time the rst print is
desired.

• Log Unit Selected - Select a unit or all units to
print logs of.

• Output Interval - Enter the desired interval between
prints.

Number of Units Connected

Using the Setpoints Screen, enter the number of chiller
units to communicate with. The identication number
of the chiller unit which is setup at the unit’s control
panel can not exceed this number. The identication
number will appear at the top of each report.

Printer Setup

Using the PRINTER Screen, the OptiView Remote
Control Center must be congured to transmit data in
the same format as the Printer is congured to receive
the data. The following values must be entered.

• Baud Rate - Set as desired. Value selected must be
the same as Printer conguration above.

• Data Bits - 8

• Parity - None

• Stop Bits - 1

Print

Pressing the Print button from the Unit Screen allows
the operator to obtain a printout of current system
operating parameters for the currently selected unit.
A sample operating data printout for a YCAS chiller
is shown following.

YORK INTERNATIONAL62

FORM 50.40-OM2

York International Corporation
Unit X Status
X Comp Screw

Liquid Line Solenoid = On
Economizer Solenoid = Off
Condenser Fan Stage = 0
Compressor Heater = On

2:04PM 18 JUN 01

System 2 Data

System 1 No Cooling Load
System 2 Compressor Running
System 3 No Cooling Load
System 4 Compressor Running

Options
Chilled Liquid Type = Water
Ambient Control Mode = Standard
Refrigerant Type = R-22

Program Values
Current Limit Setpoint = 100 %
Local/Remote Control Mode = Remote

Unit Data
Leaving Chilled Liquid Temperature = 49.0 °F
Return Chilled Liquid Temperature = 58.2 °F
Leaving Chilled Liquid Setpoint = 20.0 °F
Control Range = 2.0 °F

System Run = On
System Run Time = 15 Min
Motor Current (%FLA) = 87 %
Suction Pressure = 57.2 Psig
Discharge Pressure = 233.1 Psig
Oil Pressure = 218.0 Psig
Suction Temperature = 42.9 °F
Discharge Temperature = 145.5 °F
Oil Temperature = 102.8 °F
Saturated Suction Temp = 31.7 °F
Suction Superheat = 11.2 °F
Saturated Discharge Temp = 112.1 °F
Discharge Superheat = 33.4 °F
Slide Valve Step = 70
Cooler Inlet Refrig Temp = 23.6 °F
Liquid Line Solenoid = On
Economizer Solenoid = On
Condenser Fan Stage = 3
Compressor Heater = Off

Ambient Temerature = 74.8 °F
Lead System = 2
Evaporator Pump Contact = On
Evaporator Heater = Off
Software Version = C.ACS.09.03

System 1 Data
System Run = Off
System Run Time = 0 Min
Motor Current (%FLA) = 0 %
Suction Pressure = 125.4 Psig
Discharge Pressure = 131.3 Psig
Oil Pressure = 130.6 Psig
Suction Temperature = 68.4 °F
Discharge Temperature = 68.8 °F
Oil Temperature = 68.8 °F
Saturated Suction Temp = 71.8 °F
Suction Superheat = 3.4 °F
Saturated Discharge Temp = 74.5 °F
Discharge Superheat = 6.3 °F

System 3 Data
System Run = Off
System Run Time = 0 Min
Motor Current (%FLA) = 0 %
Suction Pressure = 125.4 Psig
Discharge Pressure = 131.3 Psig
Oil Pressure = 130.6 Psig
Suction Temperature = 68.4 °F
Discharge Temperature = 68.8 °F
Oil Temperature = 68.8 °F
Saturated Suction Temp = 71.8 °F
Suction Superheat = 3.4 °F
Saturated Discharge Temp = 74.5 °F
Discharge Superheat = 6.3 °F
Slide Valve Step = 0
Cooler Inlet Refrig Temp = 44.6 °F
Liquid Line Solenoid = Off
Economizer Solenoid = Off
Condenser Fan Stage = 0
Compressor Heater = On

Slide Valve Step = 0
Cooler Inlet Refrig Temp = 44.6 °F

4

FIG. 28 – OPERATING DATA PRINTOUT EXAMPLE (YCAS CHILLER)

63YORK INTERNATIONAL

Printers

York International Corporation
Unit X Status
X Comp Screw

2:04PM 18 JUN 01

The history printout is similar to the operational data
printout shown previously. The differences are in
the header and the schedule information. The daily
schedule is not printed for a history print. One example
history buffer header printout is shown following. The
data part of the printout will be exactly the same as the
operating data printout.

System 1 No Cooling Load
System 2 Compressor Running
System 3 No Cooling Load
System 4 Compressor Running

Options
Liquid Line Solenoid = On
Economizer Solenoid = Off
Condenser Fan Stage = 0
Compressor Heater = On

System 2 Data
System Run = On
System Run Time = 15 Min
Motor Current (%FLA) = 87 %
Suction Pressure = 57.2 Psig
Discharge Pressure = 233.1 Psig
Oil Pressure = 218.0 Psig
Suction Temperature = 42.9 °F
Discharge Temperature = 145.5 °F
Oil Temperature = 102.8 °F
Saturated Suction Temp = 31.7 °F
Suction Superheat = 11.2 °F
Saturated Discharge Temp = 112.1 °F
Discharge Superheat = 33.4 °F
Slide Valve Step = 70

York International Corporation
Unit X Safety Shutdown Number X
X Comp Screw

2:04PM 18 JUN 01

System 1 High Dsch Press Shutdown
System 2 No Faults
System 3 No Faults
System 4 No Faults

FIG. 29 – HISTORY HEADER PRINTOUT

EXAMPLE (YCAS CHILLER)

FIG. 28 – CONTINUED

YORK INTERNATIONAL64

SECTION 5 – SERVICE

INTRODUCTION

FORM 50.40-OM2

This document explains the operation of the printed
circuit boards and major components of the OptiView
Remote Control Center to a level that allows a Service
Technician to troubleshoot and locate the source of
a problem.

The overall system architecture is described and
illustrated with block diagrams. This describes the
general function of each component and provides the
system interface and signal ow. The function of each
component and signal ow 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 simplied
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 commissioning or during service. They
should not be performed by anyone other than a Service
Technician. For example, calibration procedures have
to be performed or veried at commissioning or when
a component is replaced. Since the operating program
supplied in each OptiView Remote Control Center is
universal to all applications, special setpoints, program
jumpers and program switches are required to congure
the OptiView Remote Control Center for this locations
operating conditions.

A System Commissioning Checklist is provided as
reference of items to be performed during control panel
commissioning.

Diagnostic Routines allow service analysis of the
following functions:

• Display

• Analog inputs

• Dip switches and jumpers

Before beginning any troubleshooting, observe all
display messages. 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 ow provided by this manual,
proceed with the appropriate Wiring Diagram listed
above to trace the problem through the system. Use the
Diagnostic Routines where appropriate.

5

65YORK INTERNATIONAL

Service

SYSTEM ARCHITECTURE

(REFER TO FIG. 28)

The OptiView Remote Control Center (RCC) performs
the following functions:

• Displays chiller operating conditions, alarms,
shutdown messages and history data.

• Accepts operator-programmed setpoints.

• Provides chiller operating data and status to remote
devices via serial communications.

• Allows real-time data and history data to be printed
on an optional printer.

The RCC is a microprocessor based control system
that receives analog and serial data inputs and controls
serial data outputs per instructions in the operating
program. A panel mounted display and touch-sensitive
keypad permit remote operation.

In some applications, overall system temperatures
are sensed by thermistors connected to the Remote
Control Center. 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 Remote
Control Center.

Figure 33 is a Remote Control Center block diagram
of the standard components.

The microprocessor and all supporting logic circuits,
along with the memory devices containing the operating
program, reside on the Microboard. All remote control
decisions are made here. In some applications it receives
analog inputs from devices. The analog inputs are
connected directly to the Microboard.

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 Remote Control
Center diagnostics.

A front panel mounted liquid crystal Display allows
graphic animated display of the connected chiller units,
chiller unit subsystems and system parameters. The
chiller and working components of the chiller are
displayed, along with chiller operating pressures and
temperatures. The Keypad is used to select displays
showing increasing levels of detail of chiller working
components.

Serial Data is transmitted to and received from devices
in RS-232, RS-485 and TX/RX (opto-couple) form.

All OptiView Remote Control Centers contain the
following standard components:

• Microboard

• Keypad

• Display

• Power Supply

A self-contained Power Supply supplies the necessary
DC voltages for all the components within the Remote
Control Center.

Serial data interface to the YORK ISN Building
Automation System is through the J12 connector.

YORK INTERNATIONAL66

FORM 50.40-OM2

POWER

SUPPLY

MICRO BOARD

KEYPAD

DISPLAY

INTERFACE

BOARD

LIQUID

CRYSTAL

DISPLAY

LAMP

BACKLIGHT

INVERTER

BOARD

LAMP

CONTROL

ROW IN

COLUMN OUT

DISPLAY DATA

+12 / +5 VDC

RS-232 / RS-485 SERIAL DATA

LD06742

5

FIG. 30 – CONTROL CENTER

67YORK INTERNATIONAL

Service

MICROBOARD

(REFER TO FIG. 31 - 36)

The Microboard contains the operating software
(Program), microprocessor (Micro), and supporting
circuits for the Micro.

The Program is a set of instructions to control remote
chillers and the display. It also contains the Display
messages and screens. It is stored in a memory device
called a ash memory card. This is a type of nonvolatile
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. 32. 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. 31). It connects to the
Board via an Elastomeric connector that is a silicon rubber
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 the YORK Renewal Parts List. The version of
the Memory card is an alphanumeric 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. RCC. 01. XX.

Revision level. Increments 00, 01 etc.

Product Code for OptiView RCC

Remote Control Center

Commercial

The Micro monitors and controls the chiller by reading
and executing the Program instructions in a sequence
determined by the Program. Under Program control, the
Micro communicates with the chillers via RS-485 serial
communications to determine the operating conditions.
As operating conditions require, status messages 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 the chiller(s) and
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 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 shutting down the remote control center 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 sufcient level. The Watchdog
circuit also assures that all the Program instructions are
being performed and that the Program has not latched-up,
bypassing important safety thresholds. If the Program
has latched-up, the Micro displays WATCHDOG –
SOFTWARE REBOOT message.

The Program Jumpers (Table 2) and Program Switches
(Table 3) are used to alter the Program operation or
congure the Microboard hardware for specic operation.
This allows the Program and Microboard to be universal
for all applications. Refer to Table 2 and 3 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. The position of others is dictated by the
size, type or style of certain 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.

YORK INTERNATIONAL68

FORM 50.40-OM2

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 device 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
replaceable. Refer to the YORK Renewal Parts List.
The EPROM version is an alphanumeric 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:

C. MLM. 00. XX.

Revision level. Increments 01, 02 etc.

OptiView BIOS EPROM

MILLENNIUM

Commercial

When power is applied to the Control Center following
a power failure, the Micro executes the instructions
in the BIOS EPROM program to initialize, congure
and start operation of certain Microboard components
before the main program (stored in the Flash Memory
Card) is started. Depending upon the application, the
Microboard could be equipped with an EPROM that
has either 128K, 256K or 512K capacity. Microboard
Program Jumper JP38 must be positioned according to
the actual EPROM installed. Refer to Table 2 (Program
Jumpers). There are 5 steps to the boot-up process.
During the boot-up process, there is a visual indication
as each step is performed, followed by a Pass/Fail
status of the step. On the Microboard, a green LED
ashes to indicate the step was successful. If a step
is unsuccessful, a red LED ashes and the Boot-up
process terminates. The execution and Pass/Fail status
of steps 3 through 5 are displayed on a white Keypad
Display Screen as they are performed. This white
display screen also lists the BIOS EPROM Version.
The steps of the Boot-up process are as follows. Also,
below is listed the LED activity associated with each
step.

BOOT-UP STEP AND DESCRIPTION

1. First initiate table complete.

Registers in the Micro are congured to allow it to
perform basic memory read/write functions.

2. FPGA conguration.

The Field Programmable Gate Array (FPGA) is
congured to process Digital Inputs and Outputs.

3. Mini-card signature test.

A location in the Flash Memory Card that contains
a code identifying the Manufacturer is compared to
other locations that contain the manufacturer’s name.
If these values are the same, it is pass. If they are
different, it is fail.

4. Mini-card checksum.

The Flash Memory Card checksum is calculated and
compared to the checksum value that is stored in the
Card at the time the Card was initially programmed
at the YORK factory. If both values are the same, it is
considered pass. If the calculated value is different than
the stored value, it is considered fail.

5. BRAM quick test.
Test data is written to and then read from several
memory locations to verify BRAM operation.

LED INDICATORS

When power is applied to the Control Center, both
the red and green LED’s simultaneously illuminate
for 1 second, then the Boot-up process begins in the
following sequence (Note: While one LED ashes the
other is off.). When all steps have been completed, both
the green and the red LED’s illuminate and remain
illuminated.

STEP PASS FAIL

1 Green on, Red off

initiate a re-boot.

2 Green ash once

One red ash repeating

3 Green ash once

Two red ashes repeating

4 Green ash once

Three red ashes repeating

5 Green ash once

Four red ashes repeating

Watchdog will

Boot-up process halts.

Boot-up process halts.

Boot-up process halts.

Boot-up process halts.

5

69YORK INTERNATIONAL

Service

The BRAM (battery backed random access memory) is
a memory device that contains a battery that preserves
the data during power failures. It is a replaceable part.
Refer to the YORK Renewal Parts List. It is located
in socket location U52. The Micro stores the setpoints
programmed by the Operator or Service Technician,
History Data and other data that requires preservation,
in this device. Also, the day of week, time of day and
calendar date time-keeping are done here.

The keypad is a matrix of conductors arranged in rows
and columns (ref. Fig. 45 & 46). There are 4 rows
and 8 columns. When a key is pressed, the conductors
are pressed together at that point, creating continuity
between that row conductor and the column conductor.
The Keypad is read by applying a logic low to a row
while leaving +5VDC pullup on all the other rows. The
Micro then reads the 8 columns. If any column has a
logic low on it, the key corresponding to that coordinate
(row, column) is being pressed. The Micro reads the
entire Keypad by repeating this routine beginning
with row 1 and ending with row 4. The entire Keypad
is read every Program cycle. The Micro selects the
MUX inputs (Microboard J7, J8, J9) for input to the
A/D Converter by writing sequential addresses to the
FPGA. The FPGA holds each address until a new one
is received from the Micro. As each address is applied
to the MUX, the input corresponding to that address
is passed through the MUX to the A/D Converter.
The A/D Converter will convert the analog value to a
digital word when the Micro writes a “start conversion”
pulse to the FPGA. The FPGA passes this to the A/D
Converter. The Micro allows access to the PC-104
port (Microboard J16, J17) by writing an enable
pulse to the FPGA. The FPGA applies this to the data
transceiver, allowing data to be output to or input from
the PC-104 Port.

To provide flexibility for future Analog Inputs (to
Microboard J7), 2 analog inputs can be congured for either
0-10VDC or 4-20mA, Transducer or Thermistor inputs
using Program Jumpers JP21 and JP22. The position of the
jumper determines which type of input can be connected.
Refer to Fig. 36 and Table 2, “Program Jumpers”.

These inputs are for future YORK
Factory expansion use only. They
are not general application spare
inputs that will support arbitrarily
installed devices. Devices CANNOT
be connected to these inputs until
the program has been modified to
read and process the input. Unless
YORK documentation shows a device
connected to the input with a dened
function, the input cannot be used.

The Microboard receives 2 supply voltages (Microboard
J1) from the Power Supply; +12VDC, +5VDC and
Ground. The +12VDC and +5VDC are input to Voltage
Regulators to derive other regulated voltages. The
+5VDC is input to a +3.3VDC regulator. The output is
a 3.3VDC regulated voltage. The +12VDC is input to
a 5VDC regulator. The output of this regulator powers
only the Analog circuits. This includes the MUX, A/D
converter, and Thermistors. As depicted on Fig. 33,
these voltages can be monitored at Test Posts TP1
through TP6.

The Microboard is equipped with 5 Serial Data Ports
(ref. Fig. 35). Connector J2 is shared with both COM
1 and COM 4B. Each Port is dedicated for a specic
function as follows:
a. COM 1 (J2) - RS-232. Printer.
b. COM 2 (J13) - RS-232. Not Used.
c. COM 3 (J12) - RS-485. Chiller panel communica-

tions .

d. COM 4 (4A-J11), (4B-J2) - This port is actually two

ports. However, they cannot be used simultaneously;
only one of these ports can be connected to a device
at a time. The position of Microboard Program
Jumper J27 determines which port can be used
(refer to Table 2). COM 4A (J11) is an RS-485
port that is used for Multi-Unit Communications.
COM 4B (J2) is an RS-232 port that is used for
MicroGateway.

e. COM 5 (J15) – Not Used.

YORK INTERNATIONAL70

FORM 50.40-OM2

COM 1 is connected directly to the Micro. COM
2 through 5 are connected directly to the UART
(Universal Asynchronous Receive Transmit). The
UART converts the parallel data to serial form for
transmission to the peripheral device and converts the
incoming serial data to parallel form for use by the
Micro. It also generates and processes control signals
for the Modem communications (DTR, CTS, DSR,
RTS). Under Program control, the Micro instructs the
UART of the desired data transmission Baud rate. A
crystal oscillator provides the frequency reference.
Each port is equipped with two LED’S; a red one
indicates when data is being transmitted to the remote
device and a green one indicates when data is being
received from the remote device. The RS-232 output
voltages are industry standard +3 to +15VDC, with
+9VDC typical. The RS-485 output voltages are
industry standard +1.5 to +5VDC, with +2.5VDC
typical. A loopback diagnostic test can be performed
on each serial port. This test permits verication of
the data transmitted from the serial port. Refer to the
“Serial Inputs / Outputs Tests” description in this book
for details of these tests. The graphic screens that are
displayed on the Liquid Crystal Display are created
from preformed graphics and messages that are stored
in the Program (FLASH Memory Card), and real-time
system operating parameters, such as temperatures.
The graphics, message and number data are in the form
of digital words. The Display Controller converts this
data into display drive signals and sends them to the
Display from Microboard J5. The Display has 307,200
pixels arranged in a 640 columns x 480 rows matrix
conguration. Each pixel consists of 3 windows; red,
green and blue, through which a variable amount of
light from the Display backlight is permitted to pass
through the front of the display. Imbedded in each
window of the pixel is a transistor, the conduction of
which determines the amount of light that will pass.
The drive signal determines the amount of conduction
of the transistor and therefore the amount of light
passed through the window. The overall pixel color
becomes a result of the gradient of red, green and blue
light allowed to pass. The drive signal for each pixel is
an 18 bit binary word; 6 for each of the 3 colors, red,
green and blue. The greater the binary value, the greater
the amount of light permitted to pass. The pixels are
driven sequentially from left to right, beginning with
the top row. To coordinate the drive signals and assure
the pixels in each row are driven sequentially from
left to right and the columns are driven from top to
bottom, each drive signal contains a horizontal and
vertical sync signal.

The Display DRAM is a memory device that supports
the operation of the display controller. This device
could be either of two types; FPM (fast page mode) or
EDO (extended data out) type. Program Jumper JP6
must be positioned according to the type of DRAM
device installed in the Microboard; JP6 in - EDO,
out - FPM. Refer to Table 2, “Program Jumpers”.
Depending upon the requirement, there could be one
or two DRAM devices installed in the Microboard.
If the design requires only one DRAM, it is installed
in socket U27. If an additional one is required, it is
installed in socket U25.

During the power-up sequence, the program in the
BIOS EPROM reads Program Jumper JP6 to determine
the type of Display DRAM installed (as explained
above). It also reads wire jumpers PID0 through PID3
(via Microboard J5) on the Display Interface Board
to determine the manufacturer of the display (refer to
description of Display Interface Board). Each display
manufacturer requires a slightly different control.
The program in the BIOS EPROM then congures
the Display Controller for operation with the actual
display that is present.

Different Display manufacturers can require different
supply and control voltages for their displays and
backlights. Program Jumpers JP 2 through 4 and 5
through 8 must be congured to provide the required
supply and control voltages to the display and backlight
control. Table 2 lists the required Program Jumper
conguration for the Display. Also, a label attached to
the Display mounting plate lists the required Program
Jumper conguration for that particular Display.

The power supply voltage that operates the Display
is provided by the Microboard J5. The position of
Program Jumper JP2 determines whether this supply
voltage is +5VDC or +3.3VDC. The Display requires a
specic power-up and power-off sequencing to prevent
damage. During power-up, the supply voltage must
be applied to the Display before the drive signals are
applied. Similarly, during power-off sequencing, the
display drive signals must be removed prior to removing
the supply voltage. The Display Controller applies the
supply voltage and data drive signals to the Display in
the proper sequence. The Display Controller controls
the Display Backlight by applying control signals
(from Microboard J6) to the Backlight Inverter Board.
The Backlight Inverter Board converts low voltage
DC (+12VDC or +5VDC, depending on position of

5

71YORK INTERNATIONAL

Service

Program Jumper JP5) to high voltage AC (500 to
1500VAC). This high voltage AC is applied to the lamp
to cause it to illuminate. The Backlight is turned on
and off with the “Enable Backlight” (J6-5) signal. The
position of Program Jumper JP4 determines whether
this is a +12VDC or +5VDC signal. In some displays,
the Backlight turns on when this signal transitions
from low to high; others turn on when it transitions
from high to low. The position of Program Jumper
JP3 determines the transition that will occur when the
Display Controller outputs the “Enable Backlight”
signal. Program Jumper JP3 must be positioned accord­ing to the Display manufacturer’s requirement.

Under Program control, the Display Controller controls
the Backlight brightness via the Lamp Dimmer circuit.
In order to extend the life of the backlight lamp, the lamp
brightness is driven to 50% brightness after 10 minutes
of Keypad inactivity. At this brightness level, the Display
can still be read. Subsequently, when Keypad activity is
detected (i.e. a Keypad key is pressed), the lamp is driven
back to full brightness (100% brightness). Some display
manufacturers require a variable voltage to vary the
brightness; others require a variable resistance. Program
Jumpers JP7 and JP8 allow either method to be used.
The Lamp Dimmer is an integrated circuit that is
the electrical equivalent of a 10K ohm potentiometer
with 100 positions or steps (ref. Fig. 34). The Display

Controller controls the position of the potentiometer. The
Lamp Dimmer varies the brightness of the Backlight

by applying either a variable voltage (0-5.0VDC) or
a variable resistance (0-10K ohms), to the Backlight
Inverter Board. If Program Jumpers JP7 and JP8 are
installed, the Lamp Dimmer output is a variable voltage;
if both are removed, the output is a variable resistance.
The Lamp Dimmer outputs “Brightness Control Wiper”
(J6-7) and “Brightness Control -“ (J6-8) to the Backlight
Inverter Board. If configured for variable voltage
output, the voltage between J6-7 and J6-8 can be varied
from 0 (100% brightness) to 5.0VDC (0% brightness). If
congured for variable resistance, the resistance between
J6-7 and J6-8 would vary from 0 ohms (0% brightness)
to 10K ohms (100% brightness).

The PC-104 Port (J16 & J17) is an industry standard
arrangement of two connectors that allows the stacking
of 3.6 x 3.8 inch printed circuit boards (PC-104
Modules) on the Microboard. The circuits on these
boards have access to the Microboard’s address/data bus,
and therefore become an extension of the Microboard.
This provides expansion of the Microboard’s capabili­ties without redesigning or changing the size of the
Microboard. PC-104 Modules are not used in all
Remote Control Center applications.

System tem peratures, in the form of analog DC
voltages from temperature thermistors, are input to
the MUX (multiplexers). Under Program control, the
Micro selects these values, one at a time, for input
to the Analog to Digital (A/D) converter. As each
one is selected, it is passed to the A/D Converter for
conversion to a 12-bit digital word that is then input in
parallel form to the Micro. The Micro stores each value
in the DRAM for display requests, further processing
or Serial Port transmission. Each value is also stored in
the BRAM for History data.

Service Replacement: Microboards are supplied as
Service Replacement parts without the following
components:

• BRAM (U52)

• Flash Memory Card (U46)

• BIOS EPROM (U45)

Upon receipt of the replacement Microboard, remove
these components from the Board being replaced
and install in the replacement Board. Although these
components have YORK Part Numbers as listed in
the Parts List and can be individually replaced, it is
recommended that these existing components be used
in the new Board since the BRAM memory device
contains all of the programmed setpoints.

YORK INTERNATIONAL72

FORM 50.40-OM2

FLASH
MEMORY
CARD

BIOS EPROM

BRAM

RS485

Driver

RS485

Driver

5

FIG. 31 – MICROBOARD

LD06743

73YORK INTERNATIONAL

R

AUGAT

R

MEMORY CARD

RETAINER CLIP

PRESS DOWN
TO RELEASE CARD

ELASTOMERIC

CONNECTOR

WRITE PROTECT SWITCH (OPTIONAL)
(MUST BE IN "ENABLED POSITION")

CINSCINS GND

VCC

3V/5V

KEY

ALIGNMENT

NOTCH

PAD 60

PAD 30

PAD 31

PAD 1

WRITE ENABLED

WRITE DISABLED

Service

MEMORY CARD SOCKET

MEMORY CARD -

TOP SURFACE

LD06745

TOP SURFACE

LD06744

MEMORY CARD - BOTTOM SURFACE

MEMORY CARD - SIDE VIEW

LD06746

FIG. 32 – FLASH MEMORY CARD

LD06747

YORK INTERNATIONAL74

FORM 50.40-OM2

FPGA

MUX

MUX

A/D

CONVERTER

WATCH-

DOG

PROGRAM

SWITCHES

MICRO

DRAM

DISPLAY

CONTROLLER

DRAM

FLASH

EPROM

BIOS

EPROM

BRAM

XCVR

PC-104

PORT

UART

INPUT

BUFFER

PROGRAM

JUMPERS

BACKLIGHT

CONTROL

DATA

BUS

XCVR

SERIAL DATA

PORT 1

DISPLAY INTERFACE

BOARD

BACKLIGHT INVERTER

BOARD

DIGITAL

INPUTS

DIGITAL

OUTPUTS

SERIAL

DATA PORTS

2 THROUGH 5

ANALOG

INPUTS

+5VDC REF

LVG CHILLED

R25

R28

VOLTAGE

REG

VOLTAGE

REG

+ 12VDC

+ 5VDC

GND

Y

Y

Y

Y

TP2

TP1

TP4

TP3

+ 12VDC

+ 5VDC (ANALOG)

+ 5VDC (DIGITAL)

+ 3.3VDC

FROM

POWER

SUPPLY

LD06748

FIG. 33 – MICROBOARD

5

75YORK INTERNATIONAL

Service

TABLE 2 – MICROBOARD PROGRAM JUMPERS

MICROBOARD PROGRAM JUMPERS

JP1 - Watchdog enable/disable. The position of this

jumper, in conjunction with Program switch SW
1 position 12 enables or disables the program
Watchdog protection.

Never disable the watchdog protec­tion. Severe compressor or chiller
damage could result. The ability to
disable the watchdog protection is
provided for factory testing only!!!

IN - Watchdog protection enabled.

OUT - Permits Program switch SW1 position 12 to

enable or disable the program

Watchdog protection as follows:
Position 12 ON - Watchdog protection enabled

OFF - Watchdog protection disabled

JP2 - Display power and logic levels. Determines the

power supply voltage applied to the display.

Pins 1-2: +5VDC SHARP LQ10D367

Pins 2-3: +3.3VDC LG Semicon LP104V2

displays.

JP4 - Display backlight enable signal logic levels.

Determines the logic levels of the Backlight
enable signal.

Pins 1-2: +12VDC/0VD (Not used)

Pins 2-3:+5VDC/0VDC LG Semicon LP104V2

displays.

JP5 - Display backlight power. Determines the power

supply voltage applied to the Display Backlight
Inverter Board.

Pins 1-2: +12VDC. SHARP LQ10D367 and

LG Semicon LP104V2 displays.

Pins 2-3: +5VDC. (Not used)

JP6 - Display memory type. Jumper must be posi-

tioned according to type of RAM used for
display memory devices (U25 & U27).

IN - EDO: (extended data out) type. Jumper

should be IN.

OUT - FPM: (fast page mode) type. Not used

at this time.

JP7, JP8 - Display brightness control technique.

Determines whether the display brightness is
controlled by a variable voltage or variable
resistance.

If this jumper is not correctly installed
the display could become damaged.

JP3 - Display backlight enable signal level polarity.

Jumper must be positioned according to the
voltage level required to turn on the Display
Backlight.

Pins 1-2: 0VDC (Not used)

Pins 2-3: +12VDC or +5VDC as determined

by position of JP4. SHARP LQ10D367 and LG
Semicon LP104V2 displays.

IN: Variable voltage (0-5.0VDC). SHARP

LQ10D367 and LG Semicon LP104V2 displays.

OUT: Variable resistance. (Not used)

JP9 - COM 2 serial communications port. Congures

COM 4 port to be either RS-485 or RS-232.

Pins 1-2: RS-232

Pins 2-3: RS-485

JP10 - JP26 - Not used.

YORK INTERNATIONAL76

FORM 50.40-OM2

JP27 - COM 4 serial communications port. Congures

COM 4 port to be either RS-485 for Multi-Unit
Communications (COM 4A) or RS-232 for
MicroGateway board (COM4B).

Pins 1-2: Enables port 4A. Allows an RS-485

connection to Microboard J11 for MultiUnit
Communications.

Pins 2-3: Enables port 4B. Allows an RS-232

connection to Microboard J2 for MicroGateway
communications.

JP28 - PC-104 Port interrupt assignment. Assigns

selected PC-104 interrupt request to PDRQ7 on
the microprocessor. Interrupt request selections
are silk screened on the Microboard adjacent to
the program jumper. Not used.

JP29 - PC-104 Port interrupt assignment. Assigns

selected PC-104 interrupt request to PDRQ6
on the microprocessor. Interrupt request selec­tions are silk screened on the Microboard
adjacent to the program jumper. Future modem
application.

JP30 - PC-104 Port DMA assignment. Assigns selected

PC-104 DMA request to PDRQ0 on the micro­processor. DMA request selections are silk
screened on the Microboard adjacent to the
program jumper. Not used.

JP31 - PC-104 Port DMA assignment. Assigns selected

PC-104 DMA request to PDRQ1 on the micro­processor. DMA request selections are silk
screened on the Microboard adjacent to the
program jumper. Not used.

JP32 - PC-104 Port DMA acknowledge assignment.

Assigns selected PC-104 DMA acknowledge
to PDACK0 on the microprocessor. DMA
acknowledge selections are silk screened on the
Microboard adjacent to the program jumper.
Not used.

JP33 - PC-104 Port DMA acknowledge assignment.

Assigns selected PC-104 DMA acknowledge
to PDACK1 on the microprocessor. DMA
acknowledge selections are silk screened on the
Microboard adjacent to the program jumper.
Not used.

JP34, JP35, JP36, JP37 - Not Used

JP38 - BIOS EPROM U45 size. Jumper must be

positioned according to size of U45. Jumper is
a 10 Ohm resistor that is soldered to board. It
is not a shunt jumper.

IN: 512K

OUT: 128K or 256K. Should be OUT for

OptiView Remote Control Center applications.

JP39, JP40, JP41, JP42 - Not used.

5

77YORK INTERNATIONAL

6

7

8

J6

BRIGHTNESS CONTROL (+) OR (N.C.)

BRIGHTNESS CONTROL (WIPER)

BRIGHTNESS CONTROL (-)

TO

BACKLIGHT

INVERTER

BOARD

JP8

JP7

5.0 VDC

10 K

Service

TABLE 3 – MICROBOARD PROGRAM SWITCHES

SW1

1 - Simulator mode - When this switch is closed

or in the ON position, the RCC simulates the
data from 4 chillers and will not communicate
with any attached units.

ON: Simulator mode enabled. Used for dem-

onstration.

OFF: Simulator mode is disabled. The unit

must be powered on with the switch in this
position for the RCC to communicate with
attached units and operate normally.

2 - Not Used

3 - Not Used

4 - Diagnostics - Enables or disables software

diagnostics

ON: Enables software diagnostics. Disables

normal control center operation

OFF: Disables software diagnostics. Enables

normal control center operation.

5 - 11 Not Used

12 - Watchdog Protection -Used in conjunction with

Program Jumper JP1 (see above) to enable/disable
the program watchdog protection. With JP1

IN, this switch setting has no effect. With JP1
OUT, this switch setting determines whether the

watchdog protection is enabled or disabled.

NEVER disable the watchdog protec­tion! Severe compressor or chiller
damage could result. The ability to dis­able the watchdog protection is provided
for YORK factory testing only.

ON: Watchdog protection enabled.

OFF: Watchdog protection disabled.

NOTES:

1. J6-6 not connected (N.C.) to Backlight Inverter Board when display is manufactured by Sharp or NEC.

2. The position of Program Jumpers JP7 & JP8 determine the output at J6-7; In = Variable Voltage; Out = Variable Resistance. Refer to

Program Jumper Listing in Table 2 for applications.

3. Potentiometer is actually an integrated circuit that is the electrical equivalent of a 10K potentiometer.

FIG. 34 – MICROBOARD LAMP DIMMER CIRCUIT

YORK INTERNATIONAL78

LD04054

FORM 50.40-OM2

MICRO

UART

COM 1

COM 4B

(NOTE 1)

COM 4A

(NOTE 1)

COM 2

COM 3

COM 5

OPTO-COUPLE

RS-485

RS-232

RS-485

RS-232

MICROGATEWAY

PRINTER

NOT USED

NOT USED

CONNECTION
TO CHILLER /
CONDENSING
CONTROL PANELS

NOT USED

4
3
5
2

7
6
8
9

3

2
1
4
5

1
2
3
4
5
6
7

9

3
2
1
4
5

1
2
3
4
5
6

J2

J11

J13

J12

J15

TX
RX

COMMON

NOTE 2
NOTE 2

+

--

+ 5VDC

GND

SHIELD

DCD
DSR

RX

RTS

TX
CTS
DTR

GND

--

+ 5VDC

GND

SHIELD

+

TX

RX
DTR
DSR

GTX

GRX

12

3

TX1 RX1

TX4 RX4

TX2 RX2

TX3

RX3

TX5

RX5

JP27

5

NOTE:

1. Microboard Program Jumper JP27 determines whether COM 4A or 4B can be used. 1 & 2 - 4A, 2 & 3, 4B. Refer to Table 2.

FIG. 35 – MICROBOARD SERIAL DATA COMMUNICATIONS PORTS

LD06749

79YORK INTERNATIONAL

NOT USED

NOT USED

NOT USED

NOT USED

0 10 VDC

4 - 20 MA

0-10 VDC

4 - 20 MA

4

3

1

2

16

4

14

2

13

1

MUX

47K

JP21

JP22

JP23

JP24

200

7.5 K

1

2

3

1

2

3

1

2

3

1

2

3

71.5 K

+5V

3

15

+5V

J7

J22

0-10 VDC /

0 - 20 MA /

2-10 VDC

4 - 20 MA

0-10 VDC /

0 - 20 MA /

2-10 VDC

4 - 20 MA

Service

NOTE:

1. Program Jumpers JP21 – JP24 must be positioned on pins 1-2 or 3-4 according to input signal type. Refer to Table 2.

LD04636

FIG. 36 – CONFIGURABLE ANALOG INPUTS

YORK INTERNATIONAL80

LIQUID CRYSTAL DISPLAY

(REFER TO FIG. 37 - 42)

FORM 50.40-OM2

A 10.4 inch color Liquid Crystal Display, along with
supporting components Display Interface Board and
Backlight Inverter Board are mounted on a plate that
is attached to the OptiView Control Center door. A clear
plexiglass faceplate prevents display surface damage.
System operating parameters are displayed on various
color graphic screens. The various display screens are
selected for display using the Keypad keys.

The Display provided in the OptiView RCC or from
YORK as a service replacement part, could be manufac­tured by any of several approved manufacturers. Each
Display requires a specific Display Interface Board,
Backlight Inverter Board, Inverter Board interface cable
and Program command set. Therefore, Service replace-

ment Displays or supporting components cannot be
arbitrarily selected!!! As explained below, replacement

Displays are provided from YORK as kits to assure
compatibility of all components. Non-compatibility of
components will result in incorrect operation!!! Refer
to “Display Interface Board” and “Backlight Inverter
Board” descriptions that follow. The following displays
could be provided from YORK in new OptiView RCCs
or as replacement parts:

• LG SEMICON LP104V2

• SHARP LQ10D367

The YORK part numbers of the Display Interface Board,
Backlight Inverter Board and Inverter ribbon cable provided,
are listed on a label attached to the Display mounting plate.
These are the part numbers of the supporting components
that are compatible with the installed display. These
supporting components can be individually replaced.
However, if the Liquid Crystal Display fails, Display
replacement kit 331-02053-000 must be ordered as detailed
below. This kit contains a replacement Display and all
compatible supporting components.

The Display has 307,200 pixels arranged in a 640 columns
X 480 rows matrix conguration. Each pixel consists of
3 windows; red, green and blue, through which a variable
amount of light from the Display Backlight is permitted
to pass through the front of the display. Imbedded in
each window of the pixel is a transistor, the conduction
of which determines the amount of light that will pass
through the window. The conduction of each transistor
is controlled by a signal from the Display Controller on
the Microboard. The overall pixel color is a result of the
gradient of red, green and blue light allowed to pass.

Under Program control, the Display Controller on the
Microboard sends a drive signal for each pixel to create
the image on the display. Each pixel’s drive signal is an
18 bit binary word; 6 bits for each of the 3 colors, red
green and blue. The greater the binary value, the greater
the amount of light permitted to pass. The columns of
pixels are driven from left to right and the rows are
driven top to bottom. To coordinate the drive signals
and assure the columns are driven from left to right and
the rows are driven from top to bottom, each drive signal
contains a horizontal and vertical sync signal. The
Display Interface Board receives these display drive
signals from the Microboard J5 and applies them to the
Display at connector CN1. Refer to Fig. 43.

Although there are variations in control signal timing
between different display manufacturers, Fig. 38 depicts
typical control signals. Since these control signals occur
at rates greater than can be read with a Voltmeter, the
following description is for information only. There are
480 horizontal rows of pixels. Each row contains 640
3-window pixels. Beginning with the top row, the drive
signals are applied within each row, sequentially left
to right, beginning with the left most pixel and ending
with the right most pixel. The rows are driven from top
to bottom. The Vertical Sync (VSYNC) pulse starts the
scan in the upper left corner. The rst Horizontal Sync
(HSYNC) pulse initiates the sequential application of
RGB drive signals to the 640 pixels in row 1. Upon
receipt of the ENABLE signal, an RGB drive signal
is applied to the rst pixel. As long as the ENABLE
signal is present, RGB drive signals are then applied to
the remaining 639 pixels at the CLK rate of 25.18MHz,
or one every 39.72 nanoseconds. Typically it takes 31
microseconds to address all 640 pixels. Similarly, the
next HSYNC pulse applies drive signals to row 2. This
continues until all 480 rows have been addressed. Total
elapsed time to address all 480 rows is approximately 16
milliseconds. The next VSYNC pulse causes the above
cycle to repeat. Displays can be operated in FIXED
mode or DISPLAY ENABLE mode. In FIXED mode,
the rst pixel drive signal is applied a xed number
(48) of clock (CLK) cycles from the end of the HSYNC
pulse and the drive signals are terminated a xed number
(16) of CLK cycles prior to the next HSYNC pulse.
In DISPLAY ENABLE mode, the pixel drive signals
are applied to the pixels only while ENABLE signal is
present. This signal is typically present 4-48 CLKS after
the end of the HSYNC pulse and 2-16 CLKS prior

5

81YORK INTERNATIONAL

Service

to the next HSYNC pulse. All YORK applications
operate in the DISPLAY ENABLE mode. The state of
the ENABLE (Display Interface Board J1-27) signal
from the Microboard places the Display in the desired
mode as follows:

• LG SEMICON Display does not have the xed
mode feature.

As described above, in OptiView Control Center
applications, the Display scan is left to right, beginning
with the top row and continuing sequentially through the
rows to the last row. However, in Display applications
other than OptiView Control Centers, image reversal is
sometimes required. In image reversal applications, the
scan is reversed; the scan is right to left, beginning with
the last row and proceeding to the top row.

Displays by different manufacturers can require
different timing and control signals. The Microboard
must know which Display is present in order to provide
the correct signals. Therefore, when AC control power
is rst applied to the OptiView Control Center, as part
of the power-up sequence, the Microboard reads the
Panel ID wire jumpers P1D0 - P1D3 on the Display
Interface Board and determines which Display is
present. It can then provide the correct timing and
control signals to produce the graphic image, as
required by the Display manufacturer. Since the
Display Interface Board identies the Display for
the Microboard, there is a different Display Interface
Board required for each Display application and each
has a unique jumper conguration that identies the
Display. A complete explanation of this process is
included in the preceding “Microboard” description
and the “Display Interface Board” description that
follows.

The DC power source to operate the Display is provided
by the Microboard J5. Some Display manufacturers
require +5VDC; others require +3.3VDC. The position
of Microboard Program Jumper JP2 determines which of
these power sources is supplied to the Display. JP2 must
be positioned according to the Display manufacturers
requirements. Refer to Table 2, “Program Jumpers”.

The Backlight Lamp provides the illumination for the
display. Average lamp life is 25000 hours (2.9 years).
Some displays use one lamp. Others use two lamps.
Lamps are replaceable, but not interchangeable between
different displays. Each Display manufacturer species
the required lamp for their display. Refer to replacement
parts list for appropriate replacement lamp. Service
replacement lamps are stocked in the YORK Service Parts

Distribution Center. The lamp is illuminated by applying a
high voltage AC (500 to 1500VAC) to it. This illumination
voltage is created from a low level DC voltage (+12VDC
or +5VDC as required by the Display manufacturer) by the
Backlight Inverter Board. Lamp brightness is controlled
by varying the high voltage AC. The greater the voltage
the brighter the illumination. The lamp is controlled by
on/off commands and brightness control signals applied
to the Backlight Inverter Board from the Microboard.
The Microboard Program determines when the lamp is
turned on and off and the lamp brightness. Each Display
manufacturer species the Backlight Inverter Board
to be used. Therefore, it will vary according to the
Display manufacturer. The ribbon cable that connects the
Microboard to the Backlight Inverter Board also varies
according to the Display manufacturer’s requirements.
Refer to Fig. 44. Microboard Program Jumpers JP3, 4,
5, 7 and 8 determine the voltage levels of the control
signals sent to the Backlight Inverter Board and must be
congured per the Display manufacturer’s requirements as
listed in Table 2. A detailed description of the operation of
this board is in the “Backlight Inverter Board” description
that follows. Also refer to the preceding “Microboard”
description for a detailed description of the Lamp
Dimmer circuit.

The actual Display that is installed in the OptiView
Control Center of the new chiller is determined by the
Display manufacturer contractual agreement in place
during the time of OptiView Control Center production.
Displays stocked for Service replacement are a result of
that same agreement. Therefore, the Display received for
service replacement may be by a different manufacturer
than the one in the OptiView Control Center. Since
each Display manufacturer requires a specic Display
Interface Board, Backlight Inverter Board and Inverter
Ribbon Cable, replacement Displays are ordered and
supplied as a Display Replacement Kit (YORK Part
Number 331-02053-000) to assure component compat­ibility. The items supplied in the kit are compatible with
the supplied Display. The kit consists of the following
items mounted on a Display mounting plate:

Display Replacement Kit 331-02053-000:

1. Liquid Crystal Display with Lamp

2. Appropriate Display Interface Board for item 1

3. Appropriate Backlight Inverter Board for item 1

4. Appropriate ribbon cable (Backlight Inverter Board
to Microboard) for item 1

5. Ribbon cable (Display Interface Board to
Microboard)

6. All mounting hardware

7. Installation instructions. A label attached to the

YORK INTERNATIONAL82

FORM 50.40-OM2

Display mounting plate lists the YORK part numbers
of the Display supporting components mounted
on the Display mounting plate and the required
Microboard Program Jumper (JP2 through 8)
congurations. Microboard Program Jumpers

JP2 - JP8 will have to be congured appropriately
for the replacement display. Refer to Table 2
“Program Jumpers”.

Display Handling:

1. The display is made of glass. It could break if
dropped.

2. The display front surface is easily scratched. If
soiled, wipe with a dry cotton cloth. Use no water
or chemicals.

3. The display is static sensitive. Electrostatic dis­charges may damage the display.

4. A laminated lm is adhered to the display front
glass surface to prevent it from being scratched. Peel
off very slowly to prevent static damage.

Always remove control power from
the OptiView Remote Control Center
before connecting or disconnecting
wires to the display. Connecting or
disconnecting wires to the display
with power applied will damage the
display!!!

4. Using ngernail or thin at blade screwdriver, bend
the locking tab outward slightly to clear the Lamp
housing protrusion.

5. Grasp Lamp AC power connector and gently pull
until Lamp housing clears locking tab.

6. Grasp Lamp housing and pull until Lamp housing is
completely removed from the Display.

Installation:

1. Slide new Lamp into Display from left to right
until Lamp housing protrusion locks into Display
locking tab.

2. Connect Lamp AC power connector to Backlight
Inverter Board.

3. Apply Control Power to OptiView Control Center.

LG Semicon LP104V2 Display (refer to Fig. 42)
Removal:

The Lamp slides into the Display from left to right and
is secured with a screw.

1. Remove Control Power from the OptiView Remote
Control Center.

2. Remove protective cover from rear of Display.

3. Disconnect Lamp AC power connector from Back­light Inverter Board.

4. Using small Phillips screwdriver, remove lamp
retaining screw.

5. Grasp Lamp AC power connector and gently pull
until Lamp housing is completely removed from
the Display.

BACKLIGHT LAMP REPLACEMENT:

SHARP LQ10D367 Display: (Refer to Fig. 41)
Removal:

The Lamp slides into the Display from left to right and

is secured with a locking tab.

1. Remove Control Power from the OptiView Control
Center.

2. Remove protective cover from rear of Display.

3. Disconnect Lamp AC power connector from
Backlight Inverter Board.

Installation:

1. Slide new Lamp into Display from left to right until
Lamp housing is fully inserted.

2. Secure Lamp with Lamp retaining screw.

3. Connect Lamp AC power connector to Backlight
Inverter Board.

4. Apply AC power to OptiView Remote Control
Center.

5

83YORK INTERNATIONAL

640 CLKS

640

COLUMNS

31US

VSYNC

480 ROWS

16MS

ROW 480

ROW 1

ROW 2

BP FP

DISPLAY

PERIOD

DISPLAY

PERIOD

DISPLAY

PERIOD

HSYNC

ENABLE

CLK

(25.18

MHz)

RGB

39.72 NS

Service

FIG. 37 – DISPLAY, MOUNTING

NOTES:

1. BP = Back Porch = 4-48 CLKS

2. FP = Front Porch = 2-16 CLKS

FIG. 38 – LIQUID CRYSTAL DISPLAY TYPICAL CONTROL SIGNAL TIMING

LD06751

LD04066

YORK INTERNATIONAL84

FORM 50.40-OM2

LIQUID CRYSTAL DISPLAY

SHARP LQ10D367

MOUNTING
PLATE

DISPLAY INTERFACE

BOARD 031-01765-002

DISPLAY CABLE

031-01769-000

INVERTER CABLE

031-01770-003

BACKLIGHT

INVERTER

BOARD

031-01789-000

LABEL

BACKLIGHT BULB

025-33752-000

LIQUID CRYSTAL DISPLAY

LG SEMICON LP104V2

MOUNTING
PLATE

DISPLAY INTERFACE

BOARD 031-01765-001

DISPLAY CABLE

031-02055-000

INVERTER CABLE

031-02054-001

BACKLIGHT

INVERTER

BOARD

031-01789-000

LABEL

BACKLIGHT BULB

025-34564-000

331-02053-000

031-02054-001

035-17813-002

031-01789-000

025-34564-000

031-01765-001

NOTE:

1. Congure Microboard Program Jumpers per label.

FIG. 39 – LIQUID CRYSTAL DISPLAY ASSEMBLY - LG SEMICON LP104V2

LD06752

5

NOTE:

1. Congure Microboard Program Jumpers
per label.

FIG. 40 – LIQUID CRYSTAL DISPLAY ASSEMBLY - SHARP LQ10D367

LD06753

85YORK INTERNATIONAL

LAMP HOLDER

BEZEL

PROTRUSION

HOLE

LOCKING TAB

WIRE

(white/GND side)

WIRE

(pink/HOT side)

DIRECTION A

DIRECTION B

DIRECTION C

LAMP HOLDER

BEZEL

RETAINING SCREW

WIRE

(white/GND side)

WIRE

(pink/HOT side)

DIRECTION B

DIRECTION C

Service

FIG. 41 – DISPLAY (SHARP LQ10D367) LAMP REPLACEMENT

LD04067

FIG. 42 – DISPLAY (LG SEMICON LP104V2) LAMP REPLACEMENT

LD06754

YORK INTERNATIONAL86

DISPLAY INTERFACE BOARD

(REFER TO FIG. 43)

FORM 50.40-OM2

The Display Interface Board is located on the Liquid
Crystal Display mounting plate and is part of the

Microboard interface to the Display. It permits the use
of Displays by different manufacturers, by providing the
Microboard with a means of automatically determining
which Display is present.

Since different Display manufacturers require different
timing and control signals, the Display Controller on the
Microboard must be congured to meet the requirements
of the actual Display installed. When AC power is
applied to the OptiView Remote Control Center, as part
of the power-up sequence, the Microboard reads the
four Panel ID wire jumpers, PID0 through PID3, on the
Display Interface Board to determine which Display is
present. The conguration of these jumpers indicates the
actual Display that is installed on the OptiView Remote
Control Center door. The Display Controller on the
Microboard is then congured appropriately.

On Sharp displays the conguration of wire jumpers
P30 and P31 determines whether the Display scan
orientation is Normal or Reverse (image reversal) scan.
As described in the preceding “Display” description,
Normal scan is left to right, beginning with the top row
and continuing sequentially through the rows to the
bottom row. Normal scan is used in OptiView Remote
Control Center applications. In Display applications
other than OptiView RCC applications, image reversal
is sometimes required. In image reversal applications,
the scan is reversed; the scan is right to left, beginning
with the bottom row and proceeding to the top row.
The jumper congurations determine the voltage level
at Display Interface Board J1-30 (P30) and J1-31
(P31). If P30 is IN, the voltage at J1-30 is +5.0VDC or
+3.3VDC (as determined by position of Microboard
Program Jumper JP2); if OUT, 0VDC. If P31 is IN,
the voltage at J1-31 is GND; if OUT, 0VDC. The
Display reads these voltages and adopts a scan mode
as follows:

SHARP LQ10D367 & LQ10D421 Displays:
SHARP displays require conguration of both jumpers
to achieve total image reversal.

P30 IN - Normal scan; left to right
OUT - Reverse scan: right to left

P31 IN - Normal scan; top to bottom
OUT - Reverse scan; bottom to top

The wire jumpers on this board are not eld congu­rable, as with typical Program Jumpers. There are two
variations of the Display Interface Board. Each board
has the wire jumpers congured appropriately for the
display to which it is attached, as shown below. Display
Interface Boards are available individually for service
replacement. The YORK part number of the Display
Interface Board compatible with the installed Display is
listed on a label attached to the Display mounting plate.
However, service replacement Displays are provided
as a kit (331-02053-000) that includes, among other
items, the appropriate Display Interface Board for
the Display included in the kit. Refer to explanation in
“Liquid Crystal Display” description.

031-01765-001:

Display applicability - LG Semicon LP104V2
Jumper conguration - PID0 - IN
PID1 - OUT
PID2 - OUT
PID3 - OUT
P30 - OUT
P31 - OUT

031-01765-002:

Display applicability - SHARP LQ10D367
Jumper conguration - PID0 - OUT
PID1 - IN
PID2 - OUT
PID3 - OUT
P30 - IN

P31 - IN

The red, green and blue display drive and control signals
are simply passed through the Display Interface Board.
The value of VCC is either +5VDC or +3.3VDC,
as determined by the position of Program Jumper
JP2 on the Microboard. PID0 through PID3, when
installed, connect their respective Microboard (J5)
inputs to GND; when removed, the Microboard pulls
these signals up to +5VDC. When P30 is installed, the
Display input (CN1-30) is connected to VCC (+5VDC
or +3.3VDC as determined by Microboard Program
Jumper JP2). When P31 is installed, the Display input
(CN1-31) is connected to GND.

5

87YORK INTERNATIONAL

Service

LD04070

LG SEMICON LP104V2

031-01765-001 - PID0 IN

PID1-3 OUT

P30, P31 OUT

SHARP LQ10D367

031-01765-002 - PID0 OUT

PID1 IN

PID2, 3 OUT

P30, 31 IN

FIG. 43 – DISPLAY INTERFACE BOARD

YORK INTERNATIONAL88

DISPLAY BACKLIGHT INVERTER BOARD

(REFER TO FIG. 44)

FORM 50.40-OM2

The Display Backlight Inverter Board generates a
high voltage AC signal that is applied to the backlight
lamp, causing it to illuminate. The magnitude of the
signal determines the lamp brightness. Displays by some
manufacturers have two lamps; one at the top and one at
the bottom of the display. Other Display manufacturers
have only a lamp at the top of the display.

An Inverter converts low level DC voltage (+12VDC
or +5VDC, as required by the manufacturer) from the
Microboard to a 500 to 1500VAC 60KHz signal that
is applied to the lamp. The higher the AC voltage, the
greater the brightness of the lamp. When this voltage
is not present, the lamp is turned off.

High voltage, up to 1500VAC, is pres­ent at the output of the backlight
inverter board. Refer to Figure 44
and locate the output connectors. Use
extreme caution when working in this
area!!!

Program Jumper JP4 must be positioned to provide the
required voltage. Further, some applications require this
signal to be a +VDC (+12VDC or +5VDC) to turn on
the lamp. Others require this signal to be 0VDC to turn
on the lamp. Program Jumper JP3 must be positioned to
provide the required polarity.

Depending upon the Display manufacturer, the brightness
control input from the Microboard must be either a variable
voltage or a variable resistance. Microboard Program
Jumpers JP7 and JP8 are used to provide the appropriate
technique (refer to Fig. 34). The lamp dimmer circuit on
the Microboard is an IC that is the electrical equivalent
of a 10K ohm potentiometer with 100 positions or steps.
The Program adjusts the position of the potentiometer.
When congured for variable voltage (JP7 & JP8 installed),
the output between Microboard J6-7 and J6-8 is a 0 to
+5.0VDC signal. Not all applications require the full

5.0VDC range. If congured for variable resistance (JP7
and JP8 removed), the output between Microboard J6-7 and
J6-8 is a 0 to 10K ohm variable resistance.

Different Display manufacturers require different Backlight
Inverter Boards. The different board designs require different
control voltage inputs. To accommodate these variations,
Microboard Program Jumpers JP3 - JP5, JP7 and JP8 must
be congured to provide the required voltage levels. A label
attached to the Display mounting plate lists the required
Program Jumper conguration for that particular display.
Refer to Table 2 for required Program Jumper congurations
for the various Display applications.

Under Program control, the Microboard generates the
control signals that are applied to the Backlight Inverter
Board. The Program determines when the lamp is turned
on and off. It also adjusts the lamp brightness. To increase
the average lamp life of 25000 hours, the lamp brightness
is normally adjusted to 50%. This brightness level will
still allow the display to be visible. When the Program
senses a Keypad key has been pressed, it adjusts the
brightness to 100% (maximum).

The lamp illumination high voltage AC is generated
from either +12VDC or +5VDC as required by the
manufacturer. Microboard Program Jumper JP5 must
be positioned to provide the required voltage. The
Microboard provides the Backlight Enable signal. This
signal turns the lamp on and off. Some manufacturers
require this signal to be +12VDC, others require +5VDC.

The OptiView Remote Control Center could be supplied
with any of several approved Displays. Each Display
requires a specic Backlight Inverter Board. This board
is available as a service replacement part (the required
Backlight Inverter Board part number is listed on the
label attached to the Display mounting plate). However,
service replacement Displays are provided in a kit
(YORK P/N 331-02053-000) that includes the appropriate
Backlight Inverter Board (refer to “Liquid Crystal Display”
description).

SHARP model LQ10D367 and LG Semicon LP104V2
display requires a TDK CXA-LO612-VJL Backlight
Inverter Board (YORK P/N 031-01789-000) (ref. Fig. 39
and Fig. 40). These boards generate a lamp illumination
high voltage AC from +12VDC. When the Backlight
Enable signal at connector CN1-3 is +5VDC, the high
voltage signal is applied to the lamp. When CN1-3 is
0VDC, the high voltage signal is removed from the lamp,
turning it off. The lamp brightness is controlled by a
variable voltage signal, developed by the lamp dimmer
circuit (ref. Fig. 34) on the Microboard and applied
to connector CN1-4. The lamp dimmer circuit varies
the voltage at CN1-4 over the range of 0 to +3.0VDC.
0VDC produces maximum (100%) brightness; +3.0VDC
produces minimum (0%) brightness. Voltages between
these values produce a linear brightness 0 and 100%.
Connector CN2 applies the high voltage lamp illumination
signal to the lamp.

89YORK INTERNATIONAL

5

J6

10

9

8

7

6

5

4

3

2

1

N.C.

N.C.

N.C.

N.C.

N.C.

N.C.

MICRO

BOARD

INVERTER

BOARD

1 2 3 4 5

N.C.

CN1

CN2

3 2 1

N.C.

RETURN

500 - 1400 VAC

BACKLIGHT
LAMP

BRIGHTNESS CONTROL (NOTE 2)

BACKLIGHT ENABLE (NOTE 1)

GND

+ 12 VDC (NOTE 3)

INVERTER CABLE 031-02054-001

DISPLAY BACKLIGHT INVERTER BOARD

TYPE: TDK CXA-L0612-VJL

PART NUMBER: 031-01789-000

FOR: SHARP LQ10D367 &

LG SEMICON LP104V2-W DISPLAYS

Service

NOTES:

1. OFF = 0VDC; ON = +5VDC. Refer to
Microboard Program Jumpers JP3 & JP4 in
Table 2.

2. 0 - +3.0VDC. 0VDC = MAX (100%) Brightness;
+3.0VDC = MIN (0%) Brightness. Refer to Fig.
34 and Microboard Jumpers JP7 & JP8.

3. Refer to Microboard Program Jumper JP5.

4. N.C. = No Connection.

FIG. 44 – DISPLAY BACKLIGHT INVERTER BOARD

LD06755

YORK INTERNATIONAL90

KEYPAD

(REFER TO FIGURES 45 & 46)

FORM 50.40-OM2

The Keypad contains touch-sensitive keys that allow
the Operator to interface with the Control Center. The
Operator presses the keys to request the desired screens
of information and enter System Setpoints.

The top layer of the Keypad contains embossed areas
identifying the keys. Under each embossed key area are
two conductors, one on top of the other, separated by
an air space. The conductors are arranged in a matrix
of rows and columns and connected to the Keypad
connector as shown in Fig. 46. The embossed area
of each key is located directly over the intersection
point of the conductors. Pressing the embossed key
area causes contact and electrical continuity between
the two conductors. For example, pressing the “1” key
creates continuity between the Keypad connector pin
5 (column 3) and pin 13 (row 4). Since this connector
is interfaced to the Microboard (J18), the Microboard
senses this continuity as described below and concludes
the “1” key is pressed.

The Microboard Program continuously scans the Keypad
to determine if a key is pressed. Beginning with row 1
and proceeding through all rows, the Program places a
“logic low” (<1VDC) on a row, a “logic high” (>4VDC)
on the remaining rows and reads the columns. A logic
low in any column indicates a key in that column and
row is pressed. For example, if at the time row 4 is
being driven low, if column 3 is low, then the Micro

concludes the key at coordinate of row 4 and column 3
is pressed. Since the coordinates of all keys are stored
in the Microboard’s Program, it can identify which key
is at this coordinate and responds accordingly. In this
example the “1” key is pressed.

In order for the Microboard to reliably detect closed
and open keys, each key must meet a closed circuit
and open circuit resistance requirement. When a key
is pressed, the contact resistance must be < 100 Ohms.
When a key is not pressed, the contact resistance must
be > 1 Meg Ohm. If the Microboard is not responding to
a pressed key, or if it’s detecting a closed key when none
are pressed, it could be because the contact resistance
requirements are not being met. The operation of each
key can be checked with an Ohmmeter. To check the
open and closed contact resistance of any key, refer
to the “Diagnostics and Troubleshooting” description
in this book.

The Keypad is attached to the front of the Remote
Control Center door with an adhesive backing. If
service replacement is required, start at one corner
and slowly peel the Keypad from the door. The rear
side of the replacement Keypad is coated with an
adhesive covered with a paper backing. Remove the
paper backing, align the Display opening and apply
the Keypad to the door.

5

91YORK INTERNATIONAL

Service

FIG. 45 – KEYPAD

LD06756

YORK INTERNATIONAL92

FORM 50.40-OM2

FIG. 46 – KEYPAD

LD04075

5

LD04076

93YORK INTERNATIONAL

Service

POWER SUPPLY

(REFER TO FIG 47)

The Power Supply provides the DC power for the LCD
Display and all the printed circuit boards in the Control
Center. It receives a 100 to 250VAC input from an
external power source and provides the following DC
outputs:

• +12VDC

• +5VDC

• Ground

The +12VDC, Gnd and +5VDC outputs are applied to
the Microboard. There, these voltages are applied to
the circuits requiring the respective voltage. From the
Microboard, the +12VDC and +5VDC are distributed
to other system components requiring these voltages.
These include the MicroGateway, LCD Display and
Display Backlight Inverter Board.

As shown in Fig. 47, the Microboard contains two
voltage regulators that create separate +5VDC and
+3.3VDC supplies. The +5VDC supply is dedicated
to all the Microboard Analog circuits and is labeled

as the +5VDC (Analog) supply. It is also routed to
all Temperature Thermistors. This permits all Analog
circuits to be powered by the same supply, eliminating
any offsets caused by voltage regulator drift. The
+3.3VDC supply is utilized by the Microprocessor,
Flash Memory Card and other digital circuits. It
could also be applied to the Backlight Inverter Board,
depending on the Display manufacturer’s requirements
as explained next.

Different Display manufacturers can require different
supply voltages for their display and supporting circuits.
To accommodate the different Display manufacturer’s
voltage requirements, Microboard Program Jumpers JP2
and JP5 must be positioned to provide the required supply
voltages to the Display and the Display Backlight Inverter
Board. Either +5VDC or +3.3VDC, as determined
by JP2, is applied to the Display. Either +12VDC or
+5VDC, as determined by JP5, is applied to the Display
Backlight Inverter Board. Refer to Table 2 “Microboard
Program Jumpers”.

YORK INTERNATIONAL94

DC

POWER

SUPPLY

MICRO

BOARD

MICROGATEWAY

LCD

DISPLAY

DISPLAY BACKLIGHT

INVERTER BOARD

+5VDC (ANALOG)

ALL TRANSDUCERS & THERMISTORS

+12VDC

GND

VDD (NOTE 1)

GND

+V (NOTE 2)

GND

+12VDC

GND

+5VDC

FORM 50.40-OM2

LD06757

5

NOTES:

1. +5 or +3.3VDC as determined by Microboard Program Jumper JP2

& display requirements.

& display requirements.

2. +12 or +5VDC as determined by Microboard Program Jumper JP5

FIG. 47 – POWER SUPPLY – DC POWER DISTRIBUTION (REFER TO CONTROL CENTER WIRING DIAGRAM FOR WIRE CONNECTIONS)

95YORK INTERNATIONAL

Service

OFFLINE DIAGNOSTICS & TROUBLESHOOTING

(REFER TO FIG 48 & 49)

The problems that could be encountered in the Control
Center are in the following categories:

• Keypad

• Display

• Serial Input/Output (I/O)

• Digital Input/Output (I/O)

• Analog Inputs

There is a Diagnostic and associated Troubleshooting
procedure for each category. They are described
on the following pages. The ofine diagnostics are
accessed from the Diagnostics Main Screen, which is
entered using the procedure below. If there is a Remote
Control Center problem, determine the category of
the problem. Then perform the applicable Diagnostic.
If the Diagnostic reveals a malfunction, perform the
Troubleshooting procedure to locate the defective
component.

There are several documents that must be referred to
while performing the Diagnostics and Troubleshooting
procedures. Each procedure references the Section and
gures of this book that describe the operation of the
component being tested.

The Offline diagnostic screens are only available
when the panel is powered on (or rebooted) with the
Diagnostics Enable dip switch in the Enabled position.
When in this mode all normal RCC functions are
disabled. If the Diagnostics Enable dip switch is placed
in the Disabled position while the panel is in the Ofine
Diagnostics mode, the Diagnostics task will cause the
panel to reboot into the online diagnostics mode.

YORK INTERNATIONAL96

MAIN DIAGNOSTICS SCREEN

FORM 50.40-OM2

FIG. 48

Each of the Ofine Diagnostics is accessed from this
screen. Press the appropriate key to select the desired
diagnostic. After each diagnostic is performed, return
to this MAIN Screen, from which the next diagnostic
can be selected.

Some of the diagnostics have sub-screens that are
accessed from the selected diagnostic screen. The
sub-screens are shown indented:

Main screen

- Keypad test

- Display test

- Bit patterns test

- All red

- All green

- All blue

- All white

- All black

- Serial 1/0

- Digital 1/0

- Analog Inputs

00527VIPC

5

97YORK INTERNATIONAL

Service

KEYPAD TEST

FIG. 49

This diagnostic is used to verify Keypad operation and
the Microboard’s ability to respond to a pressed key.
Refer to description of Keypad operation in Section
5 of this book.

Procedure

1. Press each keypad key. As the key is pressed, an
illuminated LED is displayed corresponding to
the key location on the keypad.

2. Press the DIAGNOSTICS key to return to the
MAIN DIAGNOSTICS Screen.

Troubleshooting
If an LED is not displayed when a key is pressed, the
Keypad, Keypad ribbon cable or Microboard could be
defective. Use the following procedure to locate the
defective component.

1. Keypad
a. Disconnect the ribbon cable from the Keypad.

b. Identify row/column coordinate of the key to

be tested. Refer to Figure 46.

00568VIPC

c. In the Keypad connector, locate the pins of

the row/column coordinate of the key of the
key to be tested.

d. Insert the leads of an Ohmmeter into the pins

identied in step “c” above.

e. Press the key to be tested. If the contact

resistance is >100 Ohms, the Keypad is defec­tive.

f. Release the key. If the contact resistance is < 1

Meg Ohm, the Keypad is defective.

2. Ribbon Cable
Using an Ohmmeter, perform a continuity test on
all conductors in the ribbon cable. An open circuit
would indicate the ribbon Cable is defective.

3. Microboard
There are no checks or measurements to be
made on the Microboard. If the Keypad and
Ribbon Cable check OK per the above procedures,
the Microboard is most likely the cause of the
problem.

YORK INTERNATIONAL98

DISPLAY TEST

FORM 50.40-OM2

FIG. 50

Each of the Display Diagnostics is accessed from this
screen. After each diagnostic is performed, return to
this screen, from which the next diagnostic can be
selected. Refer to description of Display operation in
Section 5 of this book.

PROCEDURE

1. Press the appropriate keypad key to perform the
desired test from the list below.

2. Press the CANCEL (X) or ENTER (T) key to
terminate test and return to DISPLAY TEST MAIN
Screen, from which another test can be selected.

3. When all the desired tests have been performed,
press the DIAGNOSTICS key to return to the
MAIN DIAGNOSTICS Screen.

• Bit Patterns - This test is used to detect

jitter and alignment defects. It veries proper
operation and compatibility of the Microboard
Display Controller with the display. Four
vertical bars of green, dark blue, light blue and
yellow, outlined by a red border are displayed.
If the vertical bars are not stable or straight, or
the red border is not completely visible, then
either the Microboard Program Jumpers are not
congured correctly for the installed display or
the Microboard Display controller is defective.
Refer to Figure 51.

• All Red - This test veries the operation of all

of the red pixels. All of the red pixels are turned
on to create a completely red screen. Any red

00528VIPC

pixels that do not turn on will appear as black
dots on the display. If any black dots appear, rst
ascertain it is not caused by dirt that is lodged
between the display surface and the protective
plastic cover. It is normal for a small number of
randomly spaced pixels to not illuminate. It is not
necessary to replace the display if a small number
of black dots appear. They will not be visible
on the normal screens displayed outside of this
diagnostic mode. However, large black areas
would be indicative of a defective display.

• All Green - This test verifies the operation
of all of the green pixels. All of the green
pixels are turned on to create a completely
green screen. Refer to description of “All Red”
test above.

• All Blue - This test veries the operation of
all of the blue pixels. All of the blue pixels are
turned on to create a completely blue screen.
Refer to description of “All Red” test above.

• All White - This test veries the display’s ability
to turn on all pixels to display a completely
white screen. Any pixel that does not turn on
will appear as a black dot. Refer to description
of “All Red” test above.

• All Black - This test veries the display’s ability
to turn off all pixels to display a completely
black screen. Any pixel that does not turn off
will appear as a red, green, blue or white dot.
Refer to description “All Red” test above.

5

99YORK INTERNATIONAL

Service

BIT PATTERNS TEST SCREEN

FIG. 51

TROUBLESHOOTING

If any of the above tests do not perform correctly as
described above, perform the applicable procedure
below:

Test Failed:
Bit Patterns - If the vertical bars are not straight

or if the red border is not completely visible, either
the Microboard Program Jumpers are not congured
correctly or for the installed Display or the Microboard
is defective.

All Red, All Green, All Blue, All White or All Black:

If these tests do not produce appropriate solid color
screens, the Display Ribbon Cable, Display Interface
Board, Microboard or Display could be defective. To
locate the defective component perform tests in the
following order:

1. Display Ribbon Cable:
Using an Ohmmeter, perform a continuity

test on all conductors in the ribbon cable. An
open circuit would indicate the ribbon cable
is defective.

2. Display Interface Board:
Using an Ohmmeter, perform a continuity test

on all conductors of the Interface Board. An
open circuit would indicate the Interface Board
is defective.

00529VIPC

3. Microboard:
a. With the “All Red” test selected, the voltage

at Microboard J5-6 through J5-11 (Red drivers
bits 0-5), as measured to Gnd, should be >

3.0VDC. If not, the Microboard is defective.

b. With the “All Green” test selected, the voltage

at Microboard J5-13 through J5-18 (Green
drivers bits 0-5), as measured to Gnd, should be
>3.0VDC. If not, the Microboard is defective.

c. With the “All Blue” test selected, the voltage at

Microboard J5-20 through J5-25 (Blue drivers
bits 0-5), as measured to Grid, should be
>3.0VDC. If not, the Microboard is defective.

d. With the “All White” test selected, the voltage at

Microboard J5-6 through J5-11, J5-13 through
J5-18 and J5-20 through J5-25 should be
>3.0VDC. If not, the Microboard is defective.

e. With “All Black” selected, the voltage at

Microboard J5-6 through J5-11, J5-13 through
J5-18 and J5-20 through J5-25 should be
<1.0VDC. If not, the Microboard is defective.

4. Display:
If the Display Ribbon Cable, Display Interface

Board and Microboard check OK per the above
procedures, the Display is most likely the cause
of the problem.

YORK INTERNATIONAL100