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YORK INTERNATIONAL
10
FORM 160.55-O1 (604)
version is C.OPT.02.xx.yzz, and is viewable on
the DIAGNOSTICS Screen in SERVICE access
level. The program can be upgraded by download-
ing a new program from a Program Card. Program
Cards are shirt-pocket-size portable memory stor-
age devices available from YORK.
Earlier vintage chillers could be equipped with a later
Microboard due to service replacement.
Software versions (C.MLM.02.xx.yzz or
C.OPT.02.xx.yzz) are alpha-numeric codes that rep-
resent the application, language package and revision
levels per below. Each time the controls portion or lan-
guage section is revised, the respective revision level
increments.
• C – Commercial chiller
• MLM – Used on Microboard 031-01730-
000
• OPT - Used on Microboard 031-02430-
000
• 02 – YT chiller
• xx - controls revision level (00, 01, etc)
• y – language package (0=English only,
1=NEMA, 2=CE, 3=NEMA/CE )
• zz – language package revision level (00,
01, etc)
Throughout this book, reference is made to functions and
features that are only available in certain Flash Memory
Card revision levels (C.MLM.02.xx.xxx). To cross refer-
ence C.MLM software to C.OPT software, refer to the
controls revision level. Software version
C.OPT.02.04B.xxx is of the same controls revision
level as C.MLM.02.04.xxx. From this starting point,
both receive the same updates at each revision. Soft-
ware upgrades should only be performed by a Service
Technician.
Description of System and Fun da men tals of Operation