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Chamberlain 3950 Addendum

Door compatibility
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Download this manual See also: Owner's Manual

IMPORTANT INSTALLATION INSTRUCTIONS

It is important to identify the door type before attempting an installation of the
Model 3950 door operator.
MOUNTING OPTIONS:
1
Standard wall mount using the brackets included with the operator.
2
Outside bracket mount using the optional mounting bracket Model 3950MB.
Inside bracket mount using the optional mounting bracket Model 3950MB.
3
If standard wall mount brackets are not acceptable for installation, optional
Model 3950MB mounting brackets may be required. To order visit
www.liftmaster.com or contact door supplier.
NOTE: The inside mounting option takes away from clear door opening.
LIVE OR DEAD SHAFT DOOR IDENTIFICATION
LIVE SHAFT DOOR - The axle rotates with the drum and door assembly when the door is opened or closed.
DEAD SHAFT DOOR - The axle is locked in place while the door opens and closes.
Rotating Axle
Live Shaft Door
Fixed Axle
Figure 1 - Door Type Identifi cation
DOOR COMPATIBILITY FOR MODEL 3950
Dead Shaft Door
ADDENDUM

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Summary of Contents for Chamberlain 3950

  • Page 1: Important Installation Instructions

    ADDENDUM DOOR COMPATIBILITY FOR MODEL 3950 IMPORTANT INSTALLATION INSTRUCTIONS It is important to identify the door type before attempting an installation of the Model 3950 door operator. MOUNTING OPTIONS: Standard wall mount using the brackets included with the operator. Outside bracket mount using the optional mounting bracket Model 3950MB.
  • Page 2 LIVE SHAFT REQUIREMENTS Live Shaft doors are automated by the Model 3950 driving a chain which spans the drive sprocket and the door sprocket. The door sprocket is attached to the door axle which spins the drums and rolls the door curtain. The assembly is held up by door brackets and the door guides.
  • Page 3 Spring Clearance The Model 3950 requires that the internal door springs do not interfere with the 4.5" mounting pattern on the end drum (Figure 4 ). Some door manufacturers require the door to be ordered with a modifi cation (ex. Prep for Operator), so that an extra drum (Figure 4 –...
  • Page 4 Door Construction The Dead Shaft Door must not have more than a 2" inset from the curtain edge to the drum. The Model 3950 comes with a selection of spacers that can be used in conjunction to provide a maximum 3" of spacing.
  • Page 5 Drum Condition The door drum on the side on which the Model 3950 is to be mounted must not be bent or damaged in order for installation to be successful. If bent, the drive chain may not align to the sprocket well and could derail the chain.
  • Page 6 OPERATOR DRIVE OPTIONS WHEN USING MODEL 3950MB MOUNTING BRACKET The operator drive sprocket can be attached in one of three positions when inside mounted or one of two positions if outside mounted that provide offset from the outer edge of the door guides: Refer to table below (Figure 7) for details. Figure 7 Operator Drive Options Outside Mount Alignments...
  • Page 7 3.25" 1.625" .39" holes 120° apart 6.5" Figure 8 - Mounting Hole Template...
  • Page 8 © 2010, The Chamberlain Group, Inc. 01-35863B All Rights Reserved...

This manual is also suitable for:

Liftmaster 3950