Test The Safety Reversal System; Adjustment - Chamberlain 4142DC Owner's Manual

ADJUSTMENT STEP 3

Test the Safety Reversal System

GARAGE DOOR INSTALLATION
TEST
• With the door fully open, place a 38 mm obstacle on the floor,
centered under the garage door.
• Operate the door in the down direction. The door must reverse
on striking the obstruction. Upon successful safety reversal test
proceed to Adjustment Step 4.
ADJUST
• If the door stops on the obstruction, it is not traveling far
enough in the down direction. Complete Adjustment Step 1
and 2 Programming the Limits and Forces.
NOTE: On a sectional door, make sure limit adjustments do not
force the door arm beyond a straight up and down position. See
Figure 3 on page 27.
• Repeat the test.
• When the door reverses on the 38 mm obstacle, remove the
obstruction and run the opener through 3 or 4 complete travel
cycles to test adjustment.
• If the unit continues to fail the Safety Reverse Test, call for a
trained door systems technician.
IMPORTANT SAFETY CHECK:
Test the Safety Reverse System after:
• Each adjustment of door arm length, limits, or force controls.
• Any repair to or adjustment of the garage door (including
springs and hardware).
• Any repair to or buckling of the garage floor.
• Any repair to or adjustment of the opener.
GATE INSTALLATION
TEST
The opener must reverse if the gate comes in contact with an
obstruction. A closing gate should reverse with little effort, and
open completely. See Adjustment Step 2.
• Use 38 mm board laid flat against the wall or gate edge.
• SLIDING GATE DOOR, place a 38 mm board between the door
and wall of a closing gate. Gate must reverse on the board and
open completely. Repeat at opposite wall if two openers are
installed.
• SWING OUT GATE, insert a 38 mm board between the closing
gate sections. Gate sections must reverse and swing open
completely.
ADJUST
• If the gate stops on the obstruction, it is not traveling far
enough in the closing direction. See Adjustment Step 1 Program
the Travel Limits. Repeat Test.
• When the gate reverses on a 38 mm board, remove the
obstruction and run the opener through complete travel cycle to
test adjustment.
If the gate will not reverse after repeated adjustment attempts,
call for professional gate service.
Without a properly installed safety reversal system, persons
(particularly small children) could be SERIOUSLY INJURED
KILLED by a closing door or gate.
• Safety reversal system MUST be tested every month.
• If one control (force or travel limits) is adjusted, the other
control may also need adjustment.
• After ANY adjustments are made, the safety reversal system
MUST be tested. Door MUST reverse on contact with
38 mm obstacle on the floor. Gate MUST reverse on contact
with 38 mm obstacle at the closing edge.
SECTIONAL DOOR
38 mm Obstacle
SLIDING GATE
38 mm
Obstacle
SWINGING GATE
31
ONE-PIECE DOOR
38 mm Obstacle
38 mm Obstacle
OR