AAON LC-054 - Manual (Page 36)

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cause arm to rotate quickly with force when
unlocked.
3. Rotate valve to center position so that the
center pin of the locking arm (4) is located
in the recess on the locking handle (3).
4. Loosen set screw (11) and raise locking
arm (3) to the vertical position, locking the
center pin in the locking arm recess, secure
with set screw.