Important Safety Notes - Chamberlain MH Owner's Manual

Industrial duty door operator

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User manual (12 pages)

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Installation manual (32 pages)

Table Of Contents

Table of Contents

To prevent possible SERIOUS INJURY or DEATH:

• DO NOT connect electric power until instructed to do so.

• If the door lock needs to remain functional, install an interlock

switch.

• ALWAYS call a trained professional door serviceman if door

binds, sticks or is out of balance. An unbalanced door may not

reverse when required.

It is imperative that the wall or mounting surface

provide adequate support for the operator.

This surface must:

a. Be rigid to prevent play between operator and

door shaft.

b. Provide a level base.

c. Permit the operator to be fastened securely and

with the drive shaft parallel to the door shaft.

The safety and wear of the operator will be adversely

affected if any of the above requirements are not met.

For metal buildings, fasten 2" x 2" x 3/16" (or larger)

angle iron frames to the building purlins.

5-1/2" between frames (Figure 1).

All MJ, MH, and HMJ series operators have dual output shafts and may be mounted on either the right (standard)

or left side of door, and in either a vertical (standard) or horizontal mounting position. If you need to move the drive

sprocket, loosen BOTH set screws, remove the sprocket and key, and place on the opposite side of the drive shaft.

Be sure to tighten BOTH set screws securely

Hand Chain Handing

For MH and HMJ models with manual hoist hand chain systems, the handing of the operator must be determined

at the time of order. The handing is indicated by last letter of the model name (R or L). The hand chain wheel

can not be switched on site. If your installation causes the hand chain to hang in the door opening, hook the

chain off to the side near the top of the door jamb.

WARNING