what power is needed for hold open

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A 4040SE would not hold the door open if it has : No Voltage or Improper Voltage. Check that the track has proper voltage going to it (24V AC/DC or 120V AC). If 120 volts is supplied...
The Senior Swing has an optional (plug in) Off/Auto/Hold Open switch available. The 8310-806R (rocker switch), or 8310-806K (key switch). CANNOT use switch by others, requires a special (center - n...
The 4600 hold open switch (for the new 1-24 single terminal strip I/O board) wires into terminals 2 and 6 or 4 and 6.
The 4040 regular and hold open arms are different. You would have to get a different arm to convert from regular arm to a hold open function. 4040-3077 for a regular arm. 4040-3077L for a long ...
Make sure that the hold open nut is not on upside down.  The orientation of the hold open nut depends on the mounting. On a Top Jamb "Push Side" mount, the hold open nut would poi...
The Von Duprin PS914 power supply must be used on the EL devices with either the 900-2RS or 900-4RL option board since the EL devices requires power supplies set at 24VDC to be able to provide the ...
  You can use a Von Duprin PS914 power supply with any of the following option boards depending on the application. 900-2RS board  will power 1 or 2 devices that do not require timing from pow...
The minimum door opening width (for mounting a pair of 4640 or 4630 operators on a double door) is 72" wide (2 - 36" door leaves). Mounting the 4640 or 4630 on a double door that is less than 72" w...