Chamberlain 248730 User Manual download pdf (Page 29)

Adjustments

Step 1 Adjust the UP and DOWN Travel Limits

Without a properly installed safetyreversal system,persons (particularly small children) could be

SERIOUSLY INJURED or KILLED by a closing garage door.

• Incorrectadjustment ofgarage door travel limits will interfere with proper operation of safety

reversal system.

• After ANY adjustments are made, the safetyreversal system MUST be tested. Door MUSTreverse

on contact with 1-1/2" (3.8 cm) high object(or 2x4 laid flat) on floor.

To prevent damage to vehicles, be sure fully open door provides adequate clearance.

Limit adjustment settings regulate the pointsat which the door will stop when moving up or down.

To operate the opener, pressthe Door Control push bar.

Run the opener through a complete travel cycle.

• Does the door open and close completely?

• Does the door stay closed and not reverse unintentionally when fully closed?

If your door passes both of these tests, no limit adjustmentsare necessary unless the reversing test fails

(Adjustment Step 3, page 30).

Adjustment procedures are outlined below.Read the procedures carefully before proceeding to

Adjustment Step 2. Use a screwdriver to make limit adjustments.

Run the opener through a complete travel cycle after each adjustment.

NOTE: Repeated operation of the opener during adjustment procedures may cause the motor to

overheat and shut off. Simply wait 15 minutes and try again.

NOTE: Anything interferes with the door’s upward travel, it will stop. If anything interferes with the door’s

downward travel (including binding or unbalanced doors), it will reverse.

HOW AND WHEN TO ADJUST THE LIMITS

• If the door does not open completely but opens at least five feet (1.5 m):

Increase up travel. Turn the UP limitadjustment screw clockwise. One turn equals 2" (5 cm) of

travel.

NOTE: To prevent the trolley from hitting the cover protection bolt, keep a minimum distance of 2-4" (5 cm

- 10 cm) between the trolley and the bolt.

• If door does not open at least 5 feet (1.5 m):

Adjustthe UP (open) force as explained in Adjustment Step 2.

• If the door does not close completely:

Increase down travel. Turn the DOWNlimitadjustment screw counterclockwise. One turn equals 2"

(5 cm) of travel.

If door still won’t close completely and the trolley bumps into the pulley bracket, try lengthening the

door arm (page 18) and decreasing the down limit.

• If the opener reverses in fully closed position:

Decrease down travel. Turn the DOWNlimitadjustment screw clockwise. One turn equals 2" (5 cm)

of travel.

• If the door reverses when closing and there is no visible interference to travel cycle:

If the opener lightsare flashing, the Safety Reversing Sensors are either not installed, misaligned,

or obstructed. See page 27.

Testthe door for binding: Pull the emergency release handle. Manually open and close the door. If

the door is binding or unbalanced, call for a trained door systemstechnician. Ifthe door is balanced

and not binding, adjustthe DOWN(close) force. See Adjustment Step 2.

Cover Protection Bolt

Limit Adjustm

ent Screws

2-4"

(5-10 cm)

Left Side

Panel

1 2 ... 24 25 26 27 28 29 30 31 32 33 34 ... 43 44

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Chamberlain 248730 User Manual Page 29

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