Setting The Force - Chamberlain LiftMaster Professional LM1000A Service Training Manual

Setting the Force

The force, as measured at the closing edge of the door, should not exceed 150N (15kg). If the
closing force is measured at more than 150N (15kg), a Infrared Sensor needs to be installed.
Do not readjust the force to correct any problems with jamming or sticking the door may
have. The use of excessive force can affect the proper functioning of the safety reverse system
or cause damage to the garage door.
The force is set (1&2) by means of the red button located on the back of the door opener.
As the weather can affect the smooth-running of the garage door, it may be necessary for occasional
adjustments to be made for this reason. These are made fully automatically by the door opener
itself.
Whenever the door moves, the opener checks the force requirement fully automatically and adjusts
it as necessary.
2
1
FIGURE 14 Setting the force
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