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Service Information Letters / Bulletins
SERVICE INFORMATION LETTERS / BULLETINS
SI0006 - SOFTWARE ENHANCEMENTS EFFECTIVE MAY 2001
General
Beginning May 2001, an enhanced Flash Memory Card will be supplied with new production Nema 1-4 and CE
chillers. New features are outlined below and are also included in YORK Operation Manual 160.54-O1 and Ser-
vice Manual 160.54-M1.
Flash Mem o ry Card versions and part numbers are applied as follows:
•
Nema 1-4 Chillers
•
CE Chillers
The en hanced fl ash cards are also available from the Baltimore Parts Dis tri bu tion Center for retrofi t to existing
chillers.
Surge Protection
The Surge protection feature detects surge events and provides a running count of the events that occur over the
lifetime of the chiller. An excess surge threshold can be programmed to detect excessive surging. If excess surg-
ing is detected, it can be confi gured to shutdown the chiller or initiate a special surge correction/avoidance mode
or simply display a warning message. A Surge Protection display Screen displays all parameters relevant to this
feature.
Trend Screen – Triggered Chart
A "TRIGGERED" chart can now be created. This is in addition to the ONE SCREEN and CONTINUOUS chart
types that can be created in previous Flash Memory Card versions. With the TRIG GERED chart type, data col-
lec tion can be set to START or STOP based upon the status of up to two Operator selected con di tions (TRIG-
GERS) and a selected TRIGGER DELAY. If START is selected, data col lec tion will not begin until all triggers
have been satisfi ed and any selected TRIGGER DELAY has elapsed. Data collection will stop at the completion
of one screen of data. If STOP is selected, data collection will begin when manually ini ti at ed, and will stop when
all triggers have been satisfi ed and any selected TRIGGER DELAY has elapsed.
This feature is a valuable troubleshooting tool for Service technicians. It allows an event that occurs during un at -
tend ed hours to be captured for viewing at a later time. The trigger event results in a screen of frozen trend data
that will remain on the screen until manually cleared.
Display of Service Phone Numbers
Two service phone numbers (Regional and Local), with labels, can be displayed on the OPERATIONS Screen.
The Default value for the Regional number is the North American Toll Free number. However, the label and num-
ber can be changed to any desired value. The Local label and number can also be entered.
Hot Gas Bypass Enhancement
In previous Flash Memory Card versions, when the Leaving Chilled Liquid Temperature decreased to the "Min-
i mum Load" setpoint, the Hot Gas Valve was opened to the 100% position. In this version, the valve will be
opened to the position programmed as the "Maximum Open" setpoint (25% to 100%). This allows for better
control of the minimum load conditions. After the Minimum Load operation is activated, the valve will be closed
proportionately as the Leaving Chilled Liquid Temperature increases to the Leaving Chilled Liquid Temperature
Setpoint.
168
SECTION 26
C.MLM.01.05A.102 (031-01797-001)
C.MLM.01.05A.203 (031-01797-002)
FORM 160.54-M1(503)
YORK INTERNATIONAL
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