Owner Installation Instructions
GDO-8 Shed Master®
17
Adjusting Safety Obstruction Forces
Adjusting safety obstruction force
The Safety Obstruction Force is calculated automatically and set in memory on the GDO-8 Shed Master ® . It is
usually not necessary to adjust the Safety Obstruction Force. The only time the force may need to be increased
is due to environmental conditions, for example, windy or dusty areas, and areas with extreme temperature
changes. If adjustments are made, you must retest the obstruction force margin as per above.
8.3 To increase force pressure
1. Press and hold the Force Margin Set button
(Fig. 12)
2. While holding down the Force Margin button, press the Plus button. Each press increases the force margin in
both directions. The Open Limit LED will illuminate each time the Plus button is pressed. Each press increases
the force margin. Test the force as per step 8.1 and 8.2. If the Open Limit LED fl ashes continuously when the
Plus button is being pressed, this indicates that the maximum force pressure setting has being reached.
8.4 To decrease force pressure
1. Press and hold the Force Margin Set button
(Fig. 12).
2. While holding down the Force Margin button, press the Minus button. Each press decreases the force margin.
The Close Limit LED will illuminate each time the Minus button is pressed. Test the force as per step 8.1 and
8.2. If the Close Limit LED fl ashes continuously when the Minus button is being pressed, this indicates that the
maximum force pressure setting has been reached.
8.5 To recall factory set force
1. While holding down the Force Margin Set button
(Fig. 12)
press the SET button for two (2) seconds.
2. Release both buttons. The default setting should now be recalled.
8.6. To re-calculate force margin (ISS)
Press and hold the Set Button for two (2) seconds, the beeper will sound once. The door will start to move and
re-calculate force margins. The door can move between the open and close limit positions up to four (4) times
(depending on the position of the door and the power up condition). A single beep will be heard once the
process is complete. The door is now ready for use.
IMPORTANT NOTE:
After installation ensure that the opener stops or is prevented from opening when
the door is loaded with a mass of 20kg fi xed centrally at the bottom edge of the door.
