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Service Information Letters / Bulletins
SI0019 - SOFTWARE ENHANCEMENTS EFFECTIVE MARCH 2002
General
Beginning March 2002, an enhanced Flash Memory Card will be supplied in new production YK Nema 1-4 and
CE chillers. The new features are outlined below.
The Flash Memory Card versions and part numbers are as follows:
•
Nema 1-4 chillers (except "P" com pres sors).............C.MLM.01.06.100 (031-01797-001)
•
CE chillers (except "P" com pres sors)........................C.MLM.01.06.200 (031-01797-002)
•
Nema 1-4 chillers ("P" compressors) ........................C.MLM.04.02.100 (031-02073-001)
•
CE chillers ("P" compressors) ...................................C.MLM.04.02.200 (031-02073-002)
These versions are also available from the Baltimore Parts Distribution Center for retrofi t to existing chillers.
Operator Soft Shutdown
This feature allows an Operator (logged in at Operator Access Level, or higher) to manually initiate a soft shut down
by closing the Pre-rotation Vanes prior to shutting down the chiller. This reduces com pres sor bearing wear by elimi-
nating compressor backspin at shutdown.
While the chiller is running, a SOFT SHUTDOWN key is available on the Home Screen (when Access Level is
Operator or higher). Pressing this key causes the Pre-rotation Vanes to be driven fully closed. While they are clos-
ing, "Vanes Closing Before Shutdown" is displayed on the System Status line. "Local Stop" is dis played on the
System Details line. When the Vane Motor Switch (VMS) closes, indicating the Vanes have fully closed (or 3.5
minutes have elapsed, whichever occurs fi rst), the Start Signal is removed from the Starter and a normal Coastdown
is performed.
While the Vanes are closing during the Soft Shutdown, if a standard Local Stop is initiated with the front panel Rocker
Switch, or if any faults other than the following occur, the Soft Shutdown is terminated and it will im me di ate ly enter
a normal Coastdown period:
• "Leaving Chilled Liquid – Low Temperature"
• "Remote Stop"
• "Multi-unit Cycling – Contacts Open"
• "System Cycling – Contacts Open"
• "Control Panel – Schedule"
Following an Operator initiated Soft Shutdown, the front panel Rocker Switch must be placed in the Stop/Reset
position and then to the Start position in order to start the chiller after a Soft Shutdown has been performed.
Record Setpoint Changes
This feature provides a record of the last 75 Setpoint changes. The date and time the Setpoint was changed, the new
Setpoint value and the Access Level and User ID used to make the change are stored in the BRAM. The Security
Log Screen and the Security Log Details Screen display levels of this information. Both screens are available in
Service Access level or higher.
On the Security Log Screen, accessible from the History Screen, the Setpoint, Setpoint Category and new Setpoint
value are listed and numbered in reverse order in which they were changed. The most recent is listed as number
1; the next most recent as number 2, etc. A PRINT key allows printing this entire list. Since 15 changes can be
displayed at one time, multiple pages could be necessary to display all the changes. PAGE-UP and PAGE-DOWN
keys are provided to view the entire list. If it is desired to view the details of a particular Setpoint change, select the
Setpoint change number with the LOG ENTRY key and then press the VIEW DETAILS key. This moves to the
SECURITY LOG DETAILS Screen.
170
FORM 160.54-M1(503)
YORK INTERNATIONAL
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