Chamberlain 3850 User Manual download pdf (Page 7)

ASSEMBLY STEP 3

Attach the Belt Cap Retainer

• Position the belt cap retainer over the motor unit belt

pulley so the three holes in cap align with the three

holes in mounting plate. Attach with #8x3/8" hex screws

provided.

You have now finished assembling your garage door

opener. Please read the following warnings before

proceeding to the installation section.

INSTALLATION

8x3/8" Hex Screws

Belt Cap Retainer

Mounting Plate

Motor Unit Belt Pulley

To avoid possible SERIOUS INJURY to fingers from moving

garage door opener:

• ALWAYS keep hand clear of belt pulley while operating

opener.

• Securely attach belt pulley cover BEFORE operating.

Hex Screw

#8x3/8"

HARDWARE SHOWN

ACTUAL SIZE

To reduce the risk of SEVERE INJURY or DEATH:

WARNING

1. READ AND FOLLOW ALL INSTALLATION WARNINGS AND

INSTRUCTIONS.

2. Install garage door opener ONLY on properly balanced and

lubricated garage door. An improperly balanced door may

not reverse when required and could result in SEVERE

INJURY or DEATH.

3. ALL repairs to cables, spring assemblies and other

hardware MUST be made by a trained door systems

technician BEFORE installing opener.

4. Disable ALL locks and remove ALL ropes connected to

garage door BEFORE installing opener to avoid

entanglement.

5. Install garage door opener 7 feet (2.1 m) or more above

floor.

6. Mount emergency release handle 6 feet (1.8 m) above floor.

7. NEVER connect garage door opener to power source until

instructed to do so.

8. NEVER wear watches, rings or loose clothing while

installing or servicing opener. They could be caught in

garage door or opener mechanisms.

9. Install wall-mounted garage control console:

• within sight of the garage door.

• out of reach of children at minimum height of

5 feet (1.5 m).

• away from ALL moving parts of the door.

10. Place entrapment warning label on wall next to garage

control console.

11. Place manual release/safety reverse test label in plain view

on inside of garage door.

12. Upon completion of installation, test safety reversal

system. Door MUST reverse on contact with a 1-1/2"

(3.8 cm) high object (or a 2x4 laid flat) on the floor.

13. To avoid SERIOUS PERSONAL INJURY or DEATH from

electrocution, disconnect ALL electric and battery power

BEFORE performing ANY service or maintenance.

WARNING

CAUTION

WARNING

IMPORTANT INSTALLATION INSTRUCTIONS

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Chamberlain 3850 User Manual Page 7

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