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SECTION 4 - MICROBOARD 031-02430-000 AND 031-02430-001
FORM 160.54-M1
ISSUE DATE: 10/25/2019
JOHNSON CONTROLS
JCI COMPANY CONFIDENTIAL
4
1.
Enabled
– Automatically set to this setting if Hot
gas bypass or Variable Geometry Diffuser (VGD)
is enabled on the OPERATIONS Screen or Motor
Drive Type setpoint is set to VSD or MVVSD. The
actual connection point of the potentiometer is de-
termined by the equipment configuration:
• If equipped with a VSD in YORK Protocol
configuration, it is connected to the ACC
Board.
• In Modbus Protocol configuration, it is con-
nected to the microboard J7.
If not equipped with VSD, but equipped with Hot
gas bypass, the connection point is determined
by which I/O Board is present. With I/O Board
371-02514-000, it is connected to this board; oth-
erwise, it is connected to the microboard J7. If not
equipped with Hot gas bypass but equipped with a
VGD, it is connected to the microboard J7.
2.
Disabled –
Set to this position when not equipped
with a PRV potentiometer. If equipped with a
VSD, MVVSD or the Hot gas bypass or Variable
Geometry Diffuser is enabled, this setpoint is au-
tomatically enabled and cannot be set to disabled.
• Motor Monitoring (software version
C.OPT.01.22.307 and later) – Allows the
Motor Monitoring feature to be enabled or
disabled.
• Heat Recovery (software version
C.OPT.01.21.307 (and later) – Allows the
Heat Recovery feature to be enabled or dis-
abled.
• Head Pressure Control (software version
C.OPT.01.21.307 (and later) – Allows the
Head Pressure feature to be enabled or dis-
abled.
• Heat Pump Duty (Software Version
C.OPT.01.23.307 and later) – Allows the
Heat Pump Duty to be enabled or disabled.
Microboard Service Replacement
If the microboard is replaced within the warranty pe-
riod, the defective board must be returned to YORK
per the warranty return procedure. Use the return in-
structions and return address label provided with the
replacement board.
To order a replacement Microboard for a YK Chiller,
order part number 331-02430-601. This part number
provides an 031-02430-001 Microboard that has been
programmed with the latest version of the YK “Con-
trols” software. It comes equipped with a BRAM (U38)
and BIOS EPROM (U37). (Replacement Microboards
cannot be ordered by the basic board part number of
031-02430-001). Refer to
Renewal Parts – OptiView
Control Center (Form 160.54-RP1)
.
The microboard is shipped with a label on the outside
of the shipping box that lists the part number of the pre-
programmed Microboard (331-02430-601), the basic
Microboard part number (031-02430-001) and the ver-
sion of the pre-programmed “Controls” software (for
example, C.OPT.01.14.306 or later).
Microboard 031-02430-000 is supplied as replacement
part from January 2004 until June 2006. After this date,
Microboard 031-02430-001 is supplied. This board is
an upgraded version of the 031-02430-000 Microboard
and is backward compatible to YK chillers presently us-
ing the 031-01730-000 or 031-02430-000 Microboards.
The upgrade includes a larger BRAM and an additional
RS-485 port on COM2 for Modbus serial communica-
tions. This upgrade is necessary to operate with those
motor drives that communicate with the microboard us-
ing Modbus communications, which are:
• Medium Voltage Solid State Starter (MV SSS).
• Medium Voltage Variable Speed Drive (MV VSD).
• Variable Speed Drive (VSD) Modbus applica-
tions.
• Style B Liquid Cooled Solid State Starter (LC-
SSS) Modbus applications.
A summary of the differences between 031-02430-000
and 031-02430-001 Microboards are shown in the fol-
lowing table:
