Section 3 - Microboard 031-01730-000 - Johnson Controls YORK OPTIVIEW YK Series Service Instructions Manual

FORM 160.54-M1

SECTION 3 - MICROBOARD 031-01730-000

Microboard (P/N 031-01730-000) is supplied in new
production chillers until January 2004.
The microboard contains the operating software (pro-
gram), microprocessor, and supporting circuits for the
microprocessor.
The Program is a set of instructions to control the
chiller, the display and peripheral devices. It also con-
tains the Safety and Cycling shutdown thresholds
(non changeable) and display messages and screens. It
is stored in a memory device called a Flash Memory
Card, which is a type of non-volatile memory that can
be read from or written to, but requires the locations to
be erased before they are written to. With the exception
of a write/read sequence that occurs during the boot-up
process explained below, this device is used primarily as
read-only in this application.
A write protect switch is located on the left edge of the
card as shown in Figure 11 on Page 38. It must be
placed in the Write Enabled position to allow success-
ful boot-up. The card is located in socket location U46
(Refer to Figure 10 on Page 37). It connects to the
board via an elastomeric connector that is a silicon rub-
ber strip embedded with silver conductors. The card
can be removed from its socket by using the thumb to
press down on the socket's plastic tension spring. The
card is installed by inserting it into the socket/holder
and pressing on the surface of the card until it snaps
into place.
The memory card is a replaceable component. Refer
to YORK Renewal Parts - OptiView™ Control Center
(Form 160.54-RP1). The version of the memory card is
an alpha-numeric code that represents the application
and revision level. The version is printed on a label ad-
hered to the memory card's surface. The version code
is as follows:
JOHNSON CONTROLS
C.MLM.nn.nn.nnn
Language Package Revision Level
(00, 01, etc.)
Language Package*
(0=English only, 1=NEMA 1-4, 2=CE)
Controls Revision Level (00, 01, etc.)
Chiller Type
(01=YK (all compressors after 8/02),02=YT,
03=YS, 04=YK (P compressors before
8/02), 05=YR)
Centrifugal Chiller
Commercial Chiller
* Refer to YORK Renewal Parts List 160.54-RP1 for available
languages.
1 = Supplied in new NEMA 1-4 OptiView™ Control Centers but
can be retrofit to any OptiView™ Control Center.
2 = Supplied in new CE (European Community) OptiView™
Control Centers but can be retrofit to any OptiView™ Control
Center.
There are two flash memory cards available. The dif-
ference between them is the different languages that
can be displayed on the display screens. Language
selection is performed on the USER screen following
instructions in OptiView™ Control Panel – Operation
(Form 160.54-O1). Not all languages are available.
Refer to YORK Renewal Parts - OptiView™ Control
Center (Form 160.54-RP1) for list of available flash
memory cards and display languages.
IMPORTANT! – Not all versions of
flash memory cards are compatible with
revision E (and later) microboards or all
BIOS EPROMs. If an incompatible ver-
sion is used, the initialization (boot-up)
process will not complete and the chiller
will not run! Refer to YORK Renewal
Parts - OptiView™ Control Center (Form
160.54-RP1) and Service Replacement
paragraph in this manual.
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