62
FORM 160.54-M1
ISSUE DATE: 10/25/2019
SECTION 4 - MICROBOARD 031-02430-000 AND 031-02430-001
JCI COMPANY CONFIDENTIAL
JOHNSON CONTROLS
TABLE 6 -
SUMMARY OF DIFFERENCES
031-02430-000
031-02430-001
BRAM
031-02431-000
(32KB)
031-02565-000
(128KB)
BRAM Socket
28 pin
32 pin
Program
Jumper JP14
Non-removable
wire
2-pin shunt type
w/shunt removed
COM2 Serial
Port
RS-232
RS-232 or RS485 as
selected w/JP17.
RS-485 is required
for MVSSS, MVVSD,
VSD and Style B
LCSSS Modbus
communications
Required
Controls
Software
Version
Any version
C.OPT.01.15.xxx
(or later) (see BRAM
transfer exception
below). MV VSD and
VSD Modbus require
C.OPT.01.16.xxx or
later, Style B LCSSS
Modbus requires
C.OPT.01.18.307
(or later)
Application
Except
MVSSS,
MVVSD, VSD
Modbus and
Style B LCSSS
Modbus
All including MVSSS,
MVVSD, VSD Modbus
and Style B LCSSS
Modbus
When replacing a Microboard, it is sometimes desir-
able to transfer the BRAM from the defective board
to the replacement board to save stored setpoint, His-
tory or Sales Order data. Not all BRAM devices are
compatible with all Microboards. Also, not all BIOS
EPROMs are compatible with all Microboards. The
board will not function with incorrect memory compo-
nents. Therefore, before attempting to transfer memory
components between boards, refer to the following
compatibility chart before proceeding:
TABLE 7 -
MICROBOARD
Microboard
BRAM
BIOS EPROM
031-02430-001
031-02565-000*
031-02429-001
031-02430-000
031-02431-000
031-02429-001
031-01730-000
031-02028-000
031-01796-002
NOTE:
*Refer to the following BRAM transfer exception.
When transferring a 32KB BRAM from 031-02430–
000 Board to 031-02430–001 board - applications
other than MV SSS, MV VSD and VSD Modbus ap-
plications, the 32KB BRAM (031-02431-000) from
a 031-02430-000 board can be transferred to a 031-
02430-001 board. This can be useful when it is desired
to transfer a BRAM from one board to another to save
stored setpoint, History or Sales Order data. In order to
do this, the following must be performed:
1. Install a shunt over Program Jumper JP14. Use an
unused black plastic shunt from JP9-12 (DO NOT
USE JP1).
2. Install 32KB BRAM toward bottom of the BRAM
socket (U38) so that there are 4 empty sockets at
the top of the BRAM socket as shown in the fol-
lowing figure.
LD12566
FIGURE 16 -
BRAM SOCKET
3.
With this configuration, the board can be operated
with software versions before or later than version
C.OPT.01.15.301.
Program card Service Replacement
Since one YK Program card can be used to re-program
other YK chillers, it is not necessary for an individual
Service technician to have more than one YK Program
card. Program cards can be shared among Service tech-
nicians where appropriate.
However, since chiller operating programs are occa-
sionally revised, the Service technician could have a
Program card that does not contain the latest program.
Program cards (031-02474-001) for YK chillers are
available from the Baltimore Parts Distribution Center
(PDC). The card received from the PDC is programmed
with the latest version of the chiller operating program.
Program cards can be re-programmed with the latest
program version.
