JOHNSON CONTROLS
231
SECTION 8 - MICROPANEL
FORM 201.23-NM2
ISSUE DATE: 09/25/2020
8
Power Supply Test Points
TP1 GND (Measure TP2, TP3, TP4 and TP5 in refer-
ence to this Test Point)
TP2 +3.3 V [3.2 VDC to 3.4 VDC] provides power to
the processors
TP3 +5 V [4.8 VDC to 5.2 VDC] power communiac-
tion ports 2,3 and 4 and analog sensors
TP4 +12 V [11.64 VDC to 12.36 VDC] powers the dis-
play and backlight and is regulated to become the +5 V
TP5 +15 V [11.3 VDC to 16.6 VDC] powers the analog
outputs to the EEV valves
Configuration Jumpers
The same configuration jumpers that existed on the
02478 are provided on the 03478.
JP4 Remote Temp Reset jumper position Pins 1 to 2
(left) = 4 mA to 20 mA, Pins 2 to 3 (right) = 0 VDC to
10 VDC
JP5 Remote Current Limit jumper position Pins 1 to 2
(left) = 4 mA to 20 mA, Pins 2 to 3 (right) = 0 VDC to
10 VDC
JP6 Remote Sound Limit jumper position (Pins 1 to 2
(left) = 4 mA to 20 mA, Pins 2 to 3 (right) = 0 VDC to
10 VDC
Communication Ports
TB3 Port 1 Native BAS RS-485.
SW1 RS-485 Biasing Switch for Port. Set to ON if
Chiller is in an End Of Line position on the network.
U26 is the Port 1 RS-485 Driver Chip. It is socketed to
allow field replacement. RX1 and TX1 LEDs illumi-
nate to indicate Port 1 communications activity.
E-Link
SW2 RS-485 Biasing Switch for E-link Port 2, should
be in the OFF position.
TB2 is the Port 2 RS-485 E-Link Communications
Port. RX2 and TX2 LEDs illuminate to indicate the
Port 2 communications activity. U23 is the Port 2 RS-
485 Driver Chip. It is socketed to allow field replace-
ment. J16 provides +12 VDC to power the E-Link.
VSD
J2 VSD#1 and J1 VSD#2 connections headers for RS-
485 communications to the Variable Speed Drive(s).
VSD RX and VSD TX LEDs illuminate to indicate the
VSD communications activity.U18 is the VSD Port
RS-485 Driver Chip. It is socketed to allow field re-
placement.
PROGRAM UPDATE
The Application software and BACnet database are
stored in the IPU II Flash memory. Copying a new ver-
sion of software and/or database from the SD Flash
card changes the IPU II Flash. The new application
software must be named SOFTWARE.BIN. The new
BACnet database must be named DATABASE.BIN.
These files must be located in the root directory of the
SD Flash card. The software can be updated without
updating the database. In this case, the existing data-
base will be used with the new software. The database
cannot be updated without updating the software.
To update the Program:
1. Copy the new software in to the root directory of
the SD card.
2. Rename this new program le SOFTWARE.BIN.
3. Turn the Unit Switch OFF.
4. Insert the SD card in to the SD card Reader/Writer
slot.
5. Press the OPTIONS Key and then press the Down
Arrow Key until FLASH CARD UPDATE DIS-
ABLED is displayed.
6. Press the RIGHT ARROW Key to change the
DISABLED to ENABLED
7. Press the ENTER Key to start the update. Once
the ENTER Key is pressed the message FLASH
CARD
8. UPDATING PLEASE WAIT... is displayed until
the update has been completed. The keypad and
display will not respond during the flash update.
Do not reset or power down the chiller
until the update is nished. Interrupting
the Flash Update procedure can corrupt
the program le and render the control
board inoperative.
9. After the software is nished updating, the con-
troller will automatically reboot.
10. If an error occurs during the update, an error mes-
sage will be displayed where XXXX is the Error
Code.
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