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SECTION 2 - SYSTEM ARCHITECTURE
The microprocessor and all supporting logic circuits,
along with the memory devices containing the operat-
ing program, reside on the microboard. All chiller op-
erating decisions are made here. It receives analog and
digital inputs from the chiller and remote devices. The
analog inputs are connected directly to the microboard.
The Digital inputs are received via the I/O Board (see
description below). Under Program control, the mi-
croboard operates the relays and triacs that are located
on the I/O Board.
The control center will be equipped with one of the fol-
lowing Microboards:
• 031-01730-000 – Shipped in new production
chillers until January 2004. The program resides
in a replaceable Flash memory card. The software
version is C.MLM.01.xx.yzz. It is printed on a la-
bel adhered to the card. The Program can be up-
graded by replacing the card.
• 031-02430-000 – Shipped in new production chill-
ers from January 2004 to June 2006. The pro-
gram resides in non-removable onboard memory.
The software version is C.OPT.01.xx.yzz, and is
viewable on the DIAGNOSTICS Screen in SER-
VICE access level. The Program can be upgraded
by downloading a new program from a Program
card. Program cards are shirt-pocket-size portable
memory storage devices. This board is backward
compatible to YK chillers presently using the 031-
01730-000 Microboard.
• 031-02430-001 – Shipped in new production chill-
ers after June 2006. This is an upgraded version of
the 031-02430-000 Microboard. The upgrade is
necessary to operate with the Medium Voltage Sol-
id State Starter, Medium Voltage Variable Speed
Drive and those Variable Speed Drives and Style B
Solid State Starters that serially communicate with
the microboard using Modbus Protocol.
• 031-03630-001 – Shipped in new production chill-
ers after June 2015. This new design microboard
has additional features that will be enabled in fu-
ture software revisions. It is a service replacement
for all previous OptiView microboards.
Since the newer versions microboard are backward
compatible to earlier vintage OptiView Control Cen-
ters, earlier chillers could be equipped with a later ver-
sion microboard due to service replacement.
18
The software versions (C.MLM.01.xx.yzz, C.OPT.01.
xx.yzz) or Y.OPT.01.xx.yzz are alphanumeric codes
that are interpreted as follows. Each time the controls
section or language section is revised, the respective
revision level increments.
• Y or C – Commercial chiller
• MLM – Used on Microboard 031-01730-000
• OPT – Used on Microboard 031-02430-000/-001
• 01 – YK chiller
• xx – controls revision level (00, 01, etc)
• y – language package (0=English only, 1=NEMA,
2=CE, 3=NEMA/CE )
• zz – language package revision level (00, 01, etc)
Throughout this manual, reference is made to functions
and features that are only available in certain flash
memory card revision levels (C.MLM.01.xx.xxx). To
cross reference C.MLM software to C.OPT software,
refer to the controls revision level. Software version
C.OPT.01.09.xxx is of the same controls revision level
as C.MLM.01.09.xxx. From this starting point, both re-
ceive the same updates at each revision. However, be-
ginning with the release of version C.OPT.01.15.011,
C.MLM software will no longer be revised to include
new features. Software upgrades should only be per-
formed by a Service technician.
The I/O Board acts as an input/output device for the
microboard. It conditions the digital input signals for
the microboard and contains relays and triacs that are
controlled by the microboard to control solenoids, mo-
tor contactors and actuators. The 115 VAC digital inputs
from switch and relay contacts are converted to logic
level voltages by optocouplers. The relays have +12
VDC coils that are energized and de-energized by the
microboard. The contacts of these relays control the 115
VAC system solenoids, relays and motor contactors. The
triacs are turned ON and OFF by the microboard. The
outputs of these triacs control actuators.
Chillers equipped with the Variable Geometry Diffuser
(VGD) are supplied with and require I/O Board 031-
01743-002. This board is populated with the required
Triacs Q3 and Q4 that apply the open and close signals
to the Variable Geometry Diffuser ring actuator. See
SECTION 26 - VARIABLE GEOMETRY DIFFUSER.
JCI COMPANY CONFIDENTIAL
FORM 160.54-M1
ISSUE DATE: 10/25/2019
JOHNSON CONTROLS
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