Mitsubishi Electric MAC-587IF-E Installation Manual page 42

The date of production is indicated on the SPEC NAME PLATE.
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ID :
The sequential number
The date of production (YYDDD / Y: 2-digit year , D: Date(001–366)+200*)
*If the sequential number is over 999, Date(001–366)+600.
e.g.) ID : 2 1 2 0 1 0 1 0 0 1
Date of manufacture : 1(1-Jan.)
Year of manufacture : 2021