384
FORM 160.54-M1
ISSUE DATE: 10/25/2019
SECTION 36 - SOFTWARE ENHANCEMENTS
JCI COMPANY CONFIDENTIAL
JOHNSON CONTROLS
SI0300 - SOFTWARE ENHANCEMENTS (VER 27) EFFECTIVE JUNE 2015
GENERAL
Beginning June 2015, enhanced software will be
supplied in new production YK chillers and the re-
placement microboard kit 331-02430-601. Software
version 27 is applicable to the 031-02430-000/001
microboards. The same software when used in the
new 031-03630-001 microboard is called Version 0.
The software is equivalent for both microboards. This
software is backward compatible to all previous YK
chillers equipped with microboard 031-02430-000 or
031-02430-001. Version 0 Software is only compatible
with microboard 031-03630-000. The enhancements
are listed below.
The panel software version and program card part
numbers are:
031-02430-001/001 = C.OPT.01.27.308 (P/N 031-02474-001)
031-03630-001 = Y.OPT.01.00.308 (P/N 031-03601-001)
LOSS OF SUBCOOLER LIQUID SEAL
DETECTION IMPROVEMENTS
The logic initially released in v.25C software allowed
nuisance warnings of Loss of Subcooler Liquid Seal
when the entering Condenser Liquid Temperature was
cold. The v.27 logic has been improved to eliminate
these nuisance warnings. A Subcooler Effectiveness
is now calculated and then compared to high and low
acceptable values to determine if there is a Loss of
Subcooler Liquid Seal.
Subcooler Effectiveness =
(Cond Sat Temp-Drop Leg Ref Temp)
(Cond Sat Temp-Entering Cond Liq Temp)
The calculated Subcooler Effectiveness value is com-
pared to the Subcooler Effectiveness Low value 0.4 and
the Subcooler Effectiveness High value 1.5 (both val-
ues are adjustable if needed using an Admin password.
If the calculated Subcooler Effectiveness is less than
the Subcooler Effectiveness Low value or greater than
the Subcooler Effectiveness High value continuously
for two minutes after running for at least 30 minutes,
the warning: “WARNING – LOSS OF SUBCOOLER
LIQUID SEAL” will be displayed. The warning can be
manually reset when any of the warning conditions are
no longer in effect.
The Subcooler Effectiveness and the Low and High
thresholds are displayed on the Refrigerant Level Con-
trol screen when the user is logged in at Service or Ad-
min level.
QUICK START – OIL HEATER CONTROL
To prevent overloading of the three phase transformer
that powers the oil pump and oil heater, the Quick Start
logic has been modified to
NOT
turn the Oil Heater
on while the Oil pump is running. On startup the Shut-
down Temperature is set to the calculated value.
SUBCOOLER TUBE FREEZE PROTECTION
Condenser Pump Control
If the Drop Leg Temperature is Disabled
and the
chiller is Stopped and the Condenser Pump is off, the
pump will be turned on when the Saturated Condenser
Temp is < 34.0°F. (formerly 35°F)
If the pump is on only due to the Saturated Condenser
Temp, it will be turned off when the Saturated Con-
denser Temp is > 36.0 °F (formerly 40°F). If other
logic calls for it to be on, it will remain on.
If the Drop Leg Temperature is Enabled
and the
chiller is stopped and the Condenser Pump is off, the
pump will be turned on when the Drop Leg Temp is <
35.0 °F.
If the pump is on only due to the Drop Leg Temperature,
it will be turned off when the Drop Leg Temperature is
> 36.0 °F for 5 consecutive minutes. If other logic calls
for it to be on, it will remain on.
Warning – Condenser – Freeze Threat from
Low Pressure
If the Drop Leg Temperature Sensor is Enabled:
The warning is set when All of the following are true:
• Chiller State is Stopped
• Saturated Condenser Temperature is < 34.0 °F
• Drop Leg Temperature is < 35.0 °F
The warning is released when Any of the following are
true:
• Chiller State is not Stopped
• Saturated Condenser Temperature is > 36.0 °F
• Drop Leg Temperature is > 38.0 °F
