Trane TR1 Series VFD Installation Instruction page 5

NEMA 1 Installation (continued)
Position option card to back side of cassette. Slide edge of card into
slot in side of cassette. Secure option card by pressing it flush to
cassette. Insert two self-tapping screws provided in holes in upper
left and bottom center of card. Tighten to 7 in-lb. (0. 8 N-m).
4
End view
Back side of cassette
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