User manual CHAMBERLAIN HC400

[. . . ] These safety alert symbols mean Caution ­ a personal safety or property damage instruction. This gate opener is designed and tested to offer reasonable safe service provided it is installed and operated in strict accordance with the following safety rules. [. . . ] The installation dimensions for the gate actuator unit are dependant on the fastening points of gate to post. The measurements chosen also determine the opening and closing times and the maximum opening angle of the gate. As a rule: B greater than A A greater than B slower, smoother closing, gate opens faster. Greater opening angle, however, when closing, the gate makes a harder and faster contact with the post stop. For an opening angle of 90°, addition of the dimensions A and B always gives the total actuator stroke. When a gate opening angle greater than 90° is required, dimension B will need to be reduced accordingly. In order to obtain the optimum dimensions, it may be necessary to shorten or lengthen the hinge plates supplied. In the case of a new gate, dimensions A and B may be changed when the gate angle brackets are fastened to the post accordingly. Before the installation dimensions are finalised, ensure that the gate actuator unit does not touch the post when moving. ) To avoid undesirable jerking movement, the gate should be stable and the angle brackets should have as little play as possible. [. . . ] With the gate closed, slide the fully extended actuator onto the hinge element and fasten it using the hinge pins supplied in the accessories pack. The hinge pins are blocked using the circlips which are inserted into the bottom groove of the hinge pins (Illustrations 11 and 12). [. . . ]