The Following Information is Provided Courtesy of LCN
Selecting a Door Closer
Door closers are available in two styles—concealed or surface mounted. When choosing a closer style, consideration should be given to the type of door being controlled, frame conditions, aesthetics and control features needed. Closers concealed in the head frame over the door are out of sight and out of the way. They are protected from dirt, and easy to reach for regulation without any moving parts. Closers are available for frame sections as thin as 1-3/4".
Closers located within the door itself are also hidden and protected. They work well on interior doors and are economical.
For surface mounted closers location is also a consideration. Closers on doors along a corridor should be located on the room side of the door so they are out of sight. Closers should be placed on the inside of exterior doors for protection and aesthetics.
Heavy duty door closers should be used in:
Degree of Opening
Three basic rules apply to maximum degree of opening:
Delayed Action Function
Many closers can be ordered with delayed action function. Delayed action is a special hydraulic circuit that provides additional time to pass through a door. A regulating screw controls the closing speed from maximum opening through approximately 75º. After that the normal closing speed resumes. Delayed action is not available with single lever arm closers.
The width of the door is the main consideration in determining the correct closer size. Size here refers to the minimum spring power (closing force) generated by the closer. If a door is of exceptional height, weight, special construction, or if drafts and air pressure differentials exist, increased closer power should be considered. Door thickness may be a factor. A concealed-inthe- door closer should not be used in a hollow metal door less than 1-1/2" thick or a wood door less than 1-3/4" thick. Exceptionally thick doors can affect hinge and pivot centers to the extent that closer functions and geometry are also affected.The depth of the door’s top rail is important to nearly every closer installation. Narrow top rails may require plates to successfully mount the closer. An insufficient top rail in flush, hollow or composition filled doors may make concealed-in-the-door installation impractical.
Proper Door Control
Practically every door in modern commercial, industrial and institutional buildings is opened by the person passing through and closed by a mechanical door closer which should keep the door under orderly control at all times. The power to close the door is generated by springs inside the closer. The speed of the door closing swing is controlled by regulated hydraulic circuits.
The diagram shows the main parts or stages in correct door operation, whether under manual or mechanical control, or a combination of the two.
Determining the Hand of a Door
Some door closers are handed. When approaching a door from the push side, if hinged on the left, it is a left hand door; if hinged on the right, it is a right hand door.
For purposes of handing door closers, right hand reverse bevel and left hand are identical; left hand reverse and right hand are identical. Some corner bracket installations require a closer opposite handed than the hand of the door.
Plates, Brackets, Adapters, Special Pieces
Corner brackets were once the only satisfactory way to install a closer on the push side of a door. They still meet special requirements which other mountings do not satisfy.
A plate is now commonly used to drop (lower) closers to meet special conditions or adapt a closer to door frame surfaces that are not adequate for normal mounting patterns.
Specialized brackets, adapters and parallel arm shoes are available to simplify the installation of closers with a variety of frame and door conditions.