LCN’s 4040 non-sized, cast iron body and forged steel arm door closers were developed to accommodate the demands of heavy traffic applications in institutional environments. The LCN 4040XP is the second generation door closer designed to withstand even more rigorous applications. To accomplish this, LCN has increased the size of the pinion (spindle) shaft and bearing size to ¾” diameter extending 5/8” above and below the closer body. This increases the pinion teeth size and surface area to have 44 percent more bearing load. These and other changes increase the operational life when combating forced openings and closings as well as component misalignment, according to LCN.
LCN 4040 and 4040XP door closers are designed for interior doors up to 5’0” and exterior doors up to 4’0”. They meet ANSI Standard A156.4, grade one requirements for door closers and are UL listed.
I was invited to the installation of an LCN 4040XP Door Closer onto a four foot wide hollow metal door installed onto a concrete filled metal jamb. This 16-gauge thick skin door has reinforcement for the door closer and the mortise lock.
This outswinging door is located on the exterior of an employee services building. This entrance door accommodates heavy foot traffic 24 hours a day.
The LCN 4040XP door closer was installed onto the interior (secured) side of the door using the Parallel Arm (P.A.) method. For this installation, sex bolts were installed to ensure the closer would remain securely attached to the door.
A walkway with a slight incline leads up to the door, with a dirt area beginning at slightly less than a 90 degree opening. Without an installed door closer, the door could swing almost 180 degrees. This makes it extremely difficult to install a fixed doorstop.
For this reason, the decision was made to install the 4040XP with the Spring Cush Arm. The optional, Spring Cush Arm is a non-handed solid forged steel main arm and forearm. Mounted onto the shoe of the arm is a spring loaded stop. This Spring Cush Arm is designed for heavy traffic and abusive applications.
The 4040XP comes with an EDA arm as standard. LCN also has three Cush arm options that have different types of stops that are mounted onto the shoe. In operation, the Cush arm assembly contact stops the door from swinging beyond a specific opening dimension. The Spring Cush Arm has a spring loaded contact block assembly mounted onto the shoe that uses spring pressure stop to slow and stop the door from opening beyond the installed opening angle.
The degree of opening is determined by the position of the shoe and the door closer body, which is typical of closers with a built in deadstop feature. For the Spring Cush Arm, the closer and shoe can be mounted at up to 11-1/8” from the hinge side of the jamb. The farther away the closer and shoe are located from the hinge side, the smaller the door opening.
Position the door closer template onto the door at the desired swing distance. For this installation, the door swing was determined to be 90 degrees. Position the shoe template onto the jamb, aligning it using the red arrows on both templates.
Use a 1/8” bit to drill four pilot holes in the door and five pilot holes in the jamb. Drill carefully into the jamb as it is extremely easy to dull a hi-speed drill bit when it contacts concrete.
Once the initial holes are drilled into the door and jamb, we used a 7/16” diameter drill bit to enlarge the four mounting holes in the door to accommodate the sex bolts. LCN provided self reaming and tapping screws and machine screws for installing the door closer. LCN developed their own self reaming-tapping (SRT) screws in an effort to eliminate the use of improper drill screws. LCN finds it acceptable to use their SRTs in aluminum, metal and wood door applications. However, LCN still recommends using the available #14 wood screws for wood door applications and drilling/tapping ¼-20 machine screws or installing sex bolts and mating screws in hollow metal and aluminum doors and frames.
The LCN 4040XP is the second generation heavy duty door closer designed to withstand even more rigorous applications.