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Set the arm according to your mounting type and hand of door however there is one very important requirement when it comes to this type of closer hung on a corner bracket which is, according to the manufacturer:
All of the following frame-mounted brackets require the use of a regular arm door closer of the opposite hand from the hand of the door. Use the Parallel Arm Sizing Chart to select the correct size of closer to use when the closer is to be mounted on a corner bracket.
and seen in the document here:
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When sending your unit in, simply specify the hand that you wanted to operate as when it comes back to you.