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SECTION 36 - SOFTWARE ENHANCEMENTS
FORM 160.54-M1
ISSUE DATE: 10/25/2019
JOHNSON CONTROLS
JCI COMPANY CONFIDENTIAL
36
SOFTWARE ENHANCEMENTS EFFECTIVE MARCH 2005
GENERAL
Beginning March 2005, enhanced software will be
supplied in new production YK chillers. It is backward
compatible to all previous YK chillers. The enhance-
ments are outlined below.
The versions and part numbers are:
Microboard (P/N 031-01730-000)
• NEMA 1-4 chillers
C.MLM.01.14.111 (031-01797-001)
• CE chillers
C.MLM.01.14.212 (031-01797-002)
Microboard (P/N 031-02430-000)
• NEMA 1-4 and CE chillers
C.OPT.01.14.306 (031-02474-001)
STALL SENSOR VALIDATION
This feature verifies the operation of the stall pressure
transducer (used for the variable geometry diffuser
(VGD) operation) by comparing its voltage output to
the voltage output of the condenser pressure transducer
while the chiller is running. If the stall transducer is not
reading within an acceptable range of the condenser
transducer, WARNING – CONDENSER OR VGD
SENSOR FAILURE is displayed and the VGD is driv-
en to the open position until the warning is manually
cleared.
EXTREME STALL MONITOR
To prevent VGD damage, the VGD is disabled dur-
ing extreme stall conditions and a warning message
is displayed. While the chiller is running, if the stall
detector voltage (output of the stall detector board)
exceeds twice the high limit setpoint, for the duration
programmed as the extreme stall duration setpoint (10
to 20 minutes), the VGD is driven to the full open po-
sition and WARNING – CONDITIONS OVERRIDE
VGD is displayed until the stall detector voltage re-
turns to less than two times the high limit setpoint and
the warning is manually cleared.
VGD INHIBIT SETPOINT
A new setpoint, PRV VGD Inhibit, was added to the
VGD operation. This setpoint is programmable over the
range of 40% to 100%; default 95%. While the pre-rota-
tion vanes position is greater than this setpoint, the VGD
is pulsed open according to the open pulse setpoint and
PRV POSITION OVERRIDE is displayed as control
status.
VGD LIMIT SWITCH
The status of the VGD limit switch is now displayed on
the VGD and the VGD SETPOINTS screens. The limit
wwitch is closed and displayed as CLOSED when the
VGD is in the full closed position. Otherwise, it is dis-
played as OPEN.
MOTOR LUBRICATION NOTIFICATION
This feature provides an indication when the compres-
sor motor lubrication is required. The notification is
based on the OPERATING HOURS SINCE LAST
MOTOR LUBRICATION. Up to three levels of no-
tification are provided, each indicating an increasing
level of urgency. WARNING – MOTOR BEARING
LUBE SUGGESTED is displayed when the hours ex-
ceed 1000 hours. If there is no response, WARNING –
MOTOR BEARING LUBE REQUIRED is displayed
when the hours exceed 1200 hours. If there is still no
response, a safety shutdown is performed when the
hours exceed 1400 hours and MOTOR – LACK OF
BEARING LUBRICATION is displayed. The opera-
tor enters his/her initials, name or user ID to provide
a record of when a motor lubrication was performed
and clear any motor lubrication warning or safety that
is in effect.