To complete the installation, a BEA Touchless Switch and an HES 8000 series electric strike will be mounted. The Touchless Switch is to be mounted onto the interior wall adjacent to the lock edge of the door to provide egress. Later, a remote release will be programmed to provide access for unauthorized people.
Prior to installing the Arrow 7700, the operation of the door was checked. The opening was checked to be certain the door fit properly. The hinges were inspected for wear and cleaned. Latch marks on the strike plate were checked for positioning. The only repair required was the door was slightly out of square within the opening having a gap at the bottom of the door. The gap was adjusted using a ¼” hex wrench to adjust the lower hinge. With the hex wrench inserted between the two leafs of the hinge, pressure was exerted towards closing the door. The hex wrench pushed against the leaves of the hinge, spreading them slightly. After several adjustments and checking the closed door, the lock edge of the door was within adjustment.
The Arrow 7700 door opening angle is 80-95 degrees. This opening range is excellent for the design of this uniquely shaped office. A perpendicular wall is located approximately six inches from the hinge side of the entry door. Mounted onto this perpendicular wall is a shallow cabinet. The positioning of the wall and the cabinet limits the door opening to less than 90 degrees.
To begin the installation, the existing regular arm mount door closer was removed. Having mounting holes in the doorjamb made it easy to determine the gauge of the hollow metal doorjamb. Looking into one of the screw holes drilled for the foot, we were able to roughly determine the gauge of the metal.
The doorjamb needs to be thick enough to support the weight and the operation of the door operator. A doorjamb should be re-enforced with an additional metal plate large enough to accommodate all of the mounting screws.
The removed foot screws were 12-24. This second number indicates the numbers of threads per inch. In this instance, the number of threads per inch is 24. We counted the number of threads in the doorjamb holes and there was about one thread per hole. We made an educated guess that the thickness was 18 Gauge. If the doorjamb had been re-enforced, there would have been additional threads indicating the re-enforcement. In my opinion, sufficient re-enforcement would be more than three full threads.
Here is a simple thickness gauge for steel hollow metal doorjambs. If the steel is galvanized or stainless, the thickness is different. Screw threads are per inch. For example, a ¼-20 screw has twenty threads per inch.
• 20 Gauge is residential
• 18 Gauge is .0478” thick
• 16 Gauge is .0598” thick
• 14 Gauge is .0747” thick
• 12 Gauge is detention.
For our purposes, 24 threads per inch would have a bit less than one thread at the 18 gauge thickness of .0478”. Mounting the screws only into the doorjamb would not provide sufficient support for the door operator.
Important: If there was not sufficient structural support for mounting the power operator; ribbed steel inserts and additional mounting holes would have also been the alternative to re-enforcement in the doorjamb.
Because there is no reinforcing in this hollow metal doorjamb, a decision was made to see if the wooden header could be used to secure the upper portion of the back plate. Looking down into the wall from above, we determined the header was in a position to receive mounting screws through the upper portion of the back plate. This proved to be a good idea in the end, as the doorjamb appears to have been twisted during installation.
When the door operator was initially mounted flush against the face of the doorjamb, it tilted down, causing the arm to tilt slightly in a downward direction. In this position, the arm rubbed when it was tested in the “door closer” mode. Installing two mounting screws through the upper edge of the back plate solved the problem as tightening the screws adjusted the back plate to roughly vertical.
The Detex AO19 is designed for medium to high traffic applications operating doors up to 250 lbs.