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FORM 160.54-M1
ISSUE DATE: 10/25/2019
SECTION 36 - SOFTWARE ENHANCEMENTS
JCI COMPANY CONFIDENTIAL
JOHNSON CONTROLS
GENERAL
Beginning May 2012, enhanced software is being sup-
plied in new production YK chillers and replacement
microboard kit 331-02430-601. This software is back-
ward compatible to all previous YK chillers equipped
with microboard 031-02430-000 or 031-02430-001.
The enhancements are listed below.
The Panel Software version is C.OPT.01.24.308 and
the program card part number is: (P/N 031-02474-001).
To retrofit your chiller to this S/W version you must or-
der the EPROM BIOS Software Version: C.OPT.00.04
(P/N 031-02429-002).
Reduced Panel Boot Time – Quick Start
The OptiView panel boot time has increased due to the
addition of several new languages. The time to run the
checksum on this much larger file cause the boot up
time to be too long for desired non-UPS Quick Start
time. The BIOS and controller program have been
changed to allow the user to set a parameter which
will either cause the whole file to be checked every
time the panel boots or, the user can choose to have
the panel check the complete file when initially load-
ing a new version of software. After the initial software
load checksum test, this portion of the test is skipped
on subsequent boot ups thereby decreasing the boot up
time. The following changes were made to support this
new feature.
1.
BIOS Changes
The 031-02430 board BIOS software was
changed to add the ability to turn the bootup flash
checksum test on and off. Additionally, the bootup
logo was changed to conform to the JCI standard
"YORK by Johnson Controls". The new BIOS
eprom is P/N 031-02429-002.
2.
Panel Logic Changes
A Checksum Test enable/disable setting has been
added to the BRAM to maintain the user setting
during panel power outages.
3.
Diagnostics Screen
A “Checksum Test” button has been added to the
Diagnostics Screen to enable/disable the bootup
flash checksum test. When set to enabled, the
SI0265 - SOFTWARE ENHANCEMENTS (VER 24) EFFECTIVE MAY 2012
flash checksum test is run every time the control-
ler boots up. When this parameter is set to dis-
abled, the flash checksum test is run once after an
initial loading of a new program from the flash
card and then this check is skipped at all future
controller boot ups. Once the program is copied
from the flash card to the microboard flash, there
is no risk of the program being corrupted. This
button is only shown when the Access Level is
Service or higher.
Subcooler Tube Freeze Prevention Logic
A potential exists to freeze subcooler tubes on brine
chillers when a customer has multiple chillers and uses
a valve to isolate a non-running chiller. If this valve
leaks and below freezing brine circulates through the
evaporator, the refrigerant temperature in the subcooler
can drop below freezing. The following changes have
been made to the control logic to protect the subcooler
tubes and warn the customer of the issue.
1.
Condenser Pump Control
If the chiller is Stopped and the Condenser Pump
is off, the pump is turned on whenever the Satu-
rated Condenser Temp < 35.0 °F.
If the pump is on only due to the Saturated Con-
denser Temp, it is turned off whenever the Satu-
rated Condenser Temp > 40.0 °F unless other pro-
gram logic is requesting it to continue to run.
2.
Warning – Condenser – Freeze Threat From
Low Pressure
If the chiller is stopped and the Saturated Con-
denser Temperature falls below 35.0 °F, the panel
will display the message: “Warning – Condenser
– Freeze Threat From Low Pressure”.
This warning will automatically reset whenever
the chiller is running or the Saturated Condenser
Temperature is > 40.0 °F
3.
Condenser – Freeze Threat – Flow Switch
Open
If the Chiller is stopped, the Saturated Condenser
Temperature < 35.0 °F and the Condenser Flow
Switch has been open for > 60 seconds or longer,
the panel will display the message: “Condenser –
Freeze Threat – Flow Switch Open”
