to operating the system a cover 588 attaches to the operator mounting bracket 510 with a threaded fastener 590 the cover 588 serves to surround and enclose the majority of the retrofit door operating system 500 to reduce dirt and dust contamination thereof and provide a more aesthetically pleasing appearance by concealing the internal components of the system a horizontal slot 592 in the upper end of the cover 588 allows the arm portion 601 to pivotally move therein while the door panel 16 moves between the closed and open positions to install the system 500 the wall mounting structure 504 is mounted to the upper inner edge of frame 12 as shown and the door panel mounting structure 502 is mounted to the door panel upper corner as shown with the linkage structure 600 extending therebetween the linkage is preferably distributed to the end user pre connected to the wall and door mounting structures 502 504 but it may be separate thus requiring the additional steps of attaching the linkage structure 600 to the wall and door mounting structures 502 504 the connecting terminal 574 is connected to the wall adjacent the frame 12 and the flat cable 572 is connected between the controller 508 and the terminal 574 as described above the user routs out the portion of the door frame 12 where the existing strike is and mounts the electric strike 800 into the routed opening then the low voltage wiring 580 is ran along the outer edge of the door frame 12 and connected at one end to the solenoid of the strike 800 and at the other end to.