Corbin Russwin has been producing door closers and other hardware devices for more than a century. Closers are installed at the top of a door and are used to automatically close and latch a door after it has been opened. Like most hardware companies, Corbin categorizes its closers into series based on the features and applications of each type. Corbin series 100, which is now sold as the DC6200 series, is a universal closer you can use in a wide variety of applications. You can adjust these closers depending on the size of the door as well as on the needs of the building's occupants.
Remove the cover from the closer so you can access the inner components. These covers simply snap off without the use of tools or fasteners. Corbin closers have a distinctive shape, with one rounded end and one square or rectangular. In the center of the closer body is a nut connecting the arm to the body.
Adjust the spring power. Spring power is set based on the size and weight of the door. It ranges from 1 to 6, with higher values designed for heavier or larger doors. Corbin closers are set at level 3 power at the factory, and you can adjust them by turning the nut on the rounded end of the closer. Use a 5/16-inch wrench to turn the nut clockwise to increase power or turn counterclockwise to decrease power. See page 1 of the Corbin Closer Instructions (See References.) to determine the proper spring power for your door.
Set the closing speed. Closing speed represents how fast the door will close from the point where it is fully opened until just before it latches. On Corbin closers, the closing speed nut is located on the top of the closer body, near the square or rectangular end. You'll need a 3/32 allen wrench to make this adjustment. Turn the nut clockwise to make the door close more slowly, or turn it counterclockwise to make it close faster.
Adjust the latch speed. Latch speed represents how fast the door closes in the last 10 degrees of opening, just before it latches. On Corbin closers the latch speed adjustment is located on the square end of the unit, just next to the date stamp. Use a 3/23 allen wrench to turn the nut clockwise to make the door latch more slowly or turn counterclockwise to have it latch faster. Always set closing speed before you set latch speed.
Open the door fully, and let it close. Count how long it takes for the door to close and latch. The total recommended closing time for Corbin closers is 3 to 7 seconds. This includes both the closing and latch speed. If the door is used by elderly or young occupants, you may wish to set the closing and latch speeds so that the door closes more slowly.