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SECTION 36 - SOFTWARE ENHANCEMENTS
FORM 160.54-M1
ISSUE DATE: 10/25/2019
JOHNSON CONTROLS
JCI COMPANY CONFIDENTIAL
36
SI0252 - SOFTWARE ENHANCEMENTS (VER 23) EFFECTIVE MAY 2011
GENERAL
Beginning May 2011, enhanced software will be sup-
plied in new production YK chillers and replacement
microboard kit (P/N 331-02430-601). This software
is backward compatible to all previous YK chillers
equipped with microboard (P/N 031-02430-000) or
(P/N 031-02430-001). The enhancements are listed be-
low.
The version and program card part number is:
C.OPT.01.23.307 (P/N 031-02474-001).
HEAT PUMP DUTY
Heat pump duty is now an available option for certain
models of YK chillers. On a heat pump equipped chill-
er, with heat pump duty enabled, the chiller control
can be switched between cooling and heating mode. In
cooling mode, the chiller controls the leaving chilled
liquid to the LCLT setpoint. In heating mode, the chill-
er controls the LCLT to the leaving condenser liquid
temperature setpoint. All setpoints pertinent to this fea-
ture are maintained on the HEAT PUMP screen.
VARIABLE GEOMETRY DIFFUSER
VGD Screens
The following enhancements have been made:
• Discharge pressure and condenser pressure are
now displayed.
• VGD limit switch is now labeled VGD closed
limit switch and functions the same as before.
• The surge detected LED is replaced with a surge
avoidance surge detected LED, which illuminates
when full speed surges are detected.
• ACC surge detected LED is added when the mo-
tor drive type setpoint is set to VSD and the Mo-
tor Communications Protocol setpoint is set to
MODBUS. It illuminates when running at less
than full speed.
Setpoints
The following enhancements have been made:
• The VGD high limit setpoint default changed
from 0.8V to 0.6V.
• The VGD low limit setpoint default changed from
0.6V to 0.5V.
• The PRV VGD inhibit setpoint default changed
from 95% to 100%.
Operation
The VGD logic was modified. If a stall is detected in
the SURGE WAITING state, transition to the STALL
REACTING state until stall is no longer detected. Once
stall is no longer detected and if the surge waiting timer
is still active, transition back to the SURGE WAITING
state. If the surge waiting timer is not active, then tran-
sition out of the STALL REACTING state is as pres-
ently done.
PRE-ROTATION VANES SCREEN
The PRV feedback voltage is now always shown on
this screen when the PRV potentiometer is connected
directly to the microboard.
OIL SYSTEM
In previous software versions, the condition for the oil
– low temperature differential start inhibit is checked
while the chiller is stopped and during the first 10 sec-
onds of pre-lube. In this version, check only when the
chiller is stopped and not during pre-lube.
In addition to the existing required conditions, the
WARNING - STANDBY LUBE – LOW OIL PRES-
SURE warning is now set when either the pump or
sump oil pressure is less than two psig.
VARIABLE SPEED DRIVE
Setpoints
The following enhancements were made:
• The Building Automation System (BAS), via E-
Link Gateway interface, can no longer change the
VSD FREQUENCY CONTROL MODE setpoint
(AUTO/FIXED), which is presently GPIC com-
mand object BV10 and was deleted from the
GPIC points list.
• The default value for the FREQUENCY CON-
TROL MODE setpoint is changed from manual
to auto.
• The ACC MAPPING ENABLE setpoint pro-
grammable range increased from 0.5 to 4.0°F to
0.5 to 20.0°F.
