McQuay MWM Service Manual Book page 33

9. Conversion from Old Sequential Board to New Sequential Board
(For wiring up to 1000 meters)
9.1 Sequential Main Board SQMB01 (Old Version)
9.2 Sequential Main Board SQMB01 (New Version)
Rework instruction:
SQMB01 (Main Board) from
U8
old version to new version
Step 1: Remove Jumper J1 and J2.
Step 2: Add Part: 2051-MAX1483
J1 & J2
IC :MAX1483 to U8
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