wwhat is preload position

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If the closer arm is touching the door, it is because the arm or the closer body is not templated correctly. Confirm dimensions are taken from the proper location and make corrections if needed. 
The maximum door width that pivots have been tested is a 4' wide door.  Any door greater than 4' would shorten the life of the pivots. There is no maximum door height, for offset pivots the ru...
Butt hinges can be used on  doors up to 4' wide and 200 pounds.  There is no maximum door height, just need to add a hinge for every 30" or part there of over 7'.
A 4600 (4630/4640) not opening to a full 90 degrees could be caused by a couple things: The Opening Force could be set too low. Try increasing the opening force adjustment on the controller a 1/...
The Von Duprin 6000 series electric strike has a 12 or 24VDC solenoid with plunger, spring and impact washer as shown 6000 solenoid Make sure the solenoid spring and impact washer are not missin...