Norton 78B/D-PA Traditional Door Closer, Parallel Arm

Norton 78B/D-PA Traditional Door Closer, Parallel Arm

Parallel Arm
This application provides the most appealing design appearance for a surface mounted door closer having a double lever arm. This also makes it beneficial in vandalism-prone areas. It is on the push side of the door and the arm assembly extends almost parallel to the door. In the closed position, there is very little or no hardware projecting beyond the frame face in
most situations.

Due to the geometry of the arm it is approximately 25% less power efficient than a regular arm application. The entire closer andarm assembly are mounted below the frame
stop, requiring a top rail of 5-3/8" (137mm) to mount the body. Clearance to the bottom of the closer body from the top of the door is 7-3/8" (187mm). (Based on 5/8" (16mm) high frame stop.) Only available with non-hold open arm.

EXPLANATION OF FEATURES

Aluminum Alloy Shell
Closer shells are constructed of a special aluminum alloy, carefull selected to accommodate
individual closer characteristics and operating conditions.

Adjustable Spring Power
Clock-type coil spring affords a wide range of closer power. Permits a fine adjustment of the closer to the
environment.

Rack & Pinion Operation
Provides a smooth transmission of power for control of the door through its full opening and closing cycle.

Adjustable Sweep/Latch Speed
A dual purpose regulating valve, hexkey operated, permits independent adjustment of both sweep and latch speed.

Adjustable Backcheck Cushioning
An independent regulating valve, hexkey operated, provides an adjustable hydraulic cushion to the door opening
speed toward the end of the opening cycle. This feature is standard with all but delayed action closers. Backcheck
is not available with delayed action closers.

Non-Hold Open Arm
Standard closer will be supplied with a non-hold open arm. This arm is nonhanded (field reversible).

Hold Open Arm
Available with heavy-duty arms (Parallel Rigid and Unitrol)

Warranty
Limited ten-year warranty for defects and life of the building on the aluminum housing.

Field Reversible
Closer spring can be field-reversed to accommodate the hand of the door. It is recommended that wherever
possible the closer be ordered handed. Parallel hold open arms and delayed action closers are not reversible.

Spring Power
Choice of adjustable spring power: B/D - Spring size 2, 3, or 4 E/F - Spring size 5 and 6

CERTIFICATIONS

• UL / cUL listed for use on fire rated doors
• UL10C listed for positive pressure fire test
• This product is manufactured in an ISO 9001, ISO 14001 facility
• Listed by the New York City Materials and Equipment Acceptance Division

Model: Norton 78B/D-PA 689, 78B/D-PA 690