When do I use an HEDA arm

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The 4041/4040XP HEDA arm is handed because of the hold open feature. The regular EDA arm is not handed.
The hold open position on a "REG" or "EDA"  hold open arm is set with the door to a few degrees shy of the desired hold open point. To properly set, open the door 5° less then the desired hold open...
EDA ARM - The EDA arm is a heavy duty parallel arm mount.  The degree of door opening is determined by the template used for mounting. EDA arm closers can only be mounted as a Push Side parallel ar...
The 4040 Rw/PA can be mounted 3 different ways. The 4040-18 drop plate is used for the regular pull side mount. The 4040-18TJ drop plate is used for the top jamb push side mount. The 4040-18P...
ST-1630 is required when mounting a 4041 or 4040XP door closer regular (pull/hinge) side with a concealed GJ100 or GJ410 series over head stop.
The SEH is an "electronic holder" (ONLY) that is used to hold open a Fire Rated opening. It requires a door closer to be mounted on the opposite side. It is normally used on an existing opening wit...
LCN does offer a 2810 Senior Swing / 2010 manual closer combo for a pair of doors.  Both units contained within the same Senior Swing header. To order a paired operator with a 2810 on&nb...
The 4040XP/4041 Cush and HCush (Hold Open Cush) use the same instructions / template.
The arms did not change and are interchangeable.
The 4011 can only mount on the Pull Side of the door and the 4111 can only mount on the Push Side of the door. Differences - The 4011 and the 4111 cylinders are different and the pinion shafts are...