Chamberlain HD220C User Guide

6
Assembly
STEP 2 Fasten the rail to the motor unit
To avoid SERIOUS damage to garage door opener, use ONLY the 1/4"-20x1-3/4" self-threading
screws provided.
1. Place the motor unit on packing material to protect the cover, and rest the back end of the rail on
top. For convenience, put a support under the front end of the rail.
2. Ensure that the chain spreader is installed.
3. Place the rail onto the motor unit. Align the screw holes in the rail with the holes on top of the
motor unit.
4. Use a 1/4" socket to fasten the rail with the screws; DO NOT use any power tools. The use of
power tools may permanently damage the garage door opener.
HARDWARE
Self-Threading Screw
1/4"-20x1-3/4"
Chain Spreader
IMPORTANT: Use ONLY
the 1/4"-20x1-3/4"
self-threading screws
provided in a separate bag
inside the hardware bag.
Packing
Material

Chamberlain HD220C Specifications

General

Brand	Chamberlain
Model	HD220C
Category	Garage Door Opener
Language	English