374
FORM 160.54-M1
ISSUE DATE: 10/25/2019
SECTION 36 - SOFTWARE ENHANCEMENTS
JCI COMPANY CONFIDENTIAL JOHNSON CONTROLS
SI0271 - SOFTWARE ENHANCEMENTS (VER 25) EFFECTIVE AUGUST 2013
GENERAL
Beginning May 2013, enhanced software will be 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 and program card part
number is: C.OPT.01.25C.308 (P/N 031-02474-001)
The EPROM BIOS Software Version: C.OPT.00.04
(P/N 031-02429-002)
The following program issues and display
errors have been corrected:
Low Oil Temperature Differential History Log - The
Low Oil Temperature Differential Start Inhibit is ex-
cluded from the Fault History Log since it is not a shut-
down fault.
Proximity Probe Calibration - The Proximity Probe
Calibrationis is added to the events shown in the se-
curity log.
Condenser Pump Output at Bootup - Corrected the
condition which previously closed the Condenser
Pump run output momentarily upon bootup.
Heat Recovery Head Pressure Control PID Windup Is-
sue - In previous software a windup occurred with the
heat recovery and head pressure control PID control
loop. This issue was fixed giving better control.
Display of ECLT on Heat Pump Screen - The Heat
Pump screen now correctly displays the Return Con-
denser Liquid Temperature.
Incorrect Display of MVSSS KW - The largest size
MVSSS starters now correctly displays the amount of
displayed KW.
Incorrect MVSSS Starter Model - The Solid State
Starter (SSS) Screen for the MVSSS now correctly
displays:
<Max Starting Current>K<Max Motor Current>-
<Voltage Code>
Leaving Chilled Liquid Shutdown
Temperature
The past logic that set the Shutdown Temperature to
its minimum for 10 minutes on a LCHLT Setpoint in-
crease has been changed to a variable slope.
NAME CALCULATION
LOWEST
VALUE
HIGHEST
VALUE
Shutdown
Temperature
LCHLT Setpoint
- Shutdown
Temperature
Offset, or Lowest
Value, whichever
is highest. (value
ramped as de-
scribed below)
*W: 36.0 °F
*S: 34.0 °F
*B: 6.0 °F
C: 69.0 °F
H: 85.0 °F
W = Water Mode, Smart Freeze Disabled
S = Water Mode, Smart Free Enabled
B = Brine Mode enabled
C = Cooling Mode
H = Heat Pump
On startup, the Shutdown Temperature is set to the cal-
culated value.
On a LCHLT Setpoint decrease or Shutdown Tempera-
ture Offset increase, the Shutdown Temperature is de-
creased immediately.
On a LCHLT Setpoint increase or Shutdown Tempera-
ture Offset decrease, the Shutdown Temperature is in-
creased at a rate of 0.05 °F/sec.
Leaving Condenser Liquid Shutdown
Temperature
The logic that set the Shutdown Temperature to its
maximum for 10 minutes on a LCLT Setpoint decrease
has been changed to a variable slope.
NAME CALCULATION
LOWEST
VALUE
HIGHEST
VALUE
Shutdown
Temperature
LCLT Setpoint +
Shutdown Tem-
perature Offset, or
Highest Displayed
Value, whichever
is lowest (value
ramped as de-
scribed below)
66.0 °F 125.0 °F
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