Chamberlain 248735 3/4 HP Planning (Continued), ONE-PIECEDOOR WITH TRACK, ONE-PIECEDOOR INSTALLATIONS, ONE-PIECEDOOR WITHOUT TRACK

Access

Door

Safety Reversing

Sensor

Gap between floor

and bottom of door must not exceed 1/4" (6 mm).

Planning (Continued)

ONE-PIECE DOOR INSTALLATIONS

•Generally, a one-piece door does not require reinforcement. If your door is lightweight, refer to the information relating to sectional doors in Installation Step 11.

•Depending on your door’s construction, you may need additional mounting hardware for the door bracket (Step 11).

Without a properly working safety reversal system, persons (particularly small children) could be SERIOUSLY INJURED or KILLED by a closing garage door.

•The gap between the bottom of the garage door and the floor MUST NOT exceed 1/4" (6 mm). Otherwise, the safety reversal system may not work properly.

•The floor or the garage door MUST be repaired to eliminate the gap.

ONE-PIECE DOOR WITHOUT TRACK

Header Wall

FINISHED CEILING

Support bracket & fastening hardware is required. See page 16.

Rail

Slack in chain tension is normal when garage door is closed.

Wall-mounted

Door Control

Safety Reversing Sensor

Motor Unit

	CLOSED POSITION
	Trolley Stop Bolt		Cable	Trolley
	Header
	Bracket	Rail
	Door Bracket
				Emergency
	Straight			Release
			Curved	Rope & Handle
	Door		Door
Header	Arm		Arm
Wall	Garage Door

ONE-PIECE DOOR WITH TRACK

Safety

Reversing Sensor

Access

Door

Safety

Reversing

Gap between floor Sensor and bottom of door

must not exceed 1/4" (6 mm).

	CLOSED POSITION
	Trolley Stop Bolt	Cable	Chain
Header
Wall	Header	Curved
			Rail
	Bracket	Door Arm
	Door		Emergency
		Straight	Release
	Bracket
			Rope &
		Door
			Handle
	Garage	Arm
	Door

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