Chamberlain RJO20, Manual

4

 Is Your Garage Ready? 

Use this check list to see if your garage is compatible with the garage door opener requirements. Note that you can 
install the garage door opener on either the left or the right side of the garage door.

I

MPORTANT: Your garage MUST meet the following requirements to install this opener to ensure safe and proper 

operation. If your door does not meet these criteria, you must choose a different model of operator. If your torsion 
bar, power source and/or drums do not meet the requirements, contact a trained door systems technician.

REQUIREMENTS CHECK LIST

   Sectional garage door:

•  Standard sectional door up to 14 feet (4.3 m) high, but only up to 180 sq. ft. (16.7 sq. m). 

•  Standard sectional doors up to 18 feet (5.5 m) wide, but only up to 180 sq. ft. (16.7 sq. m) 

•  Standard sectional high lift door (up to 54 inches (137.2 cm) of high lift)  

•  Any gap between the fl oor and the bottom of the door must not exceed 1/4 inch (6 mm). Otherwise, the safety 

reversal system may not work properly. .

  Torsion bar and torsion springs:

  • Torsion bar is 1 inch (2.5 cm) diameter.
  • Torsion bar must extend at least 1-1/2 inches (3.81 cm) past the bearing plate and be free of damage.
  • Distance between ceiling and center of torsion bar is 3 inches (7.6 cm) or more. 
  •  Distance between garage wall the torsion bar is mounted on and center of torsion bar is 2-1/2 inches (6.4 cm) 

or more. 

  •  A minimum of 8.5 inches (21.6 cm) between the side garage wall (or obstruction) and the end of the torsion 

bar.

 D 

rums:

•  NOT compatible with reverse wound drums.
•  4-6 inches (10-15 cm) diameter.
•  3-3.9 inch (7.6-9.9 cm) diameter drums may be used on doors up to 430 lbs (194kgs).

Power:

• An electric outlet must be accessible within a 6 foot (1.83 m) diameter of the installation area for the opener. 

The outlet must be 120 VAC - 60 Hz 

ONLY

. Contact a qualifi ed electrician if you need an outlet installed.

  Previously installed garage door opener has been removed completely. 

Preparation 

(continued)

Wall

Side view of torsion bar

Torsion bar must extend 
at least 1-1/2 inches (3.81 
cm) past the bearing plate

Electric outlet 
within 6 ft 
(1.83 cm) of 
opener

2-1/2"
(6.4 cm)

3"
(7.6 cm)

Ceiling

Distance between ceiling 
and torsion bar is 3" 
(7.6 cm) or more

Ceiling

Torsion bar

Drum

Wall 
with 
door

Gap between floor and 
bottom of door must 
not exceed 1/4" (6 mm)

Wall or 
obstruction

Torsion bar

8.5 inches 
(21.6 cm)