Page 18 - Herrajes Patricios - Catalogo LCN

General
information

Mechanical
considerations

DO YOU NEED SPECIAL CYLINDER FUNCTIONS? IS SEASONAL ADJUSTMENT REQUIRED?
Many LCN closers can be ordered with a delayed action func tion Temperature changes can affect the operation of common door
built into the cylinder. Delayed action (DEL) is a special hydraulic closers by changing the viscosity of the hydraulic fluid inside the
circuit that provides additional time to pass through the door. A closer. As temperature rises, the fluid thins out and closes the door
special regulating screw con trols the closing speed from maxi- more rapidly. As temperatures decrease, the fluid thickens causing
mum opening through approximately 75°. After that point the the closer to close the door very slowly.
normal main speed resumes control to close the door. Delayed LCN uses all weather Ultra X fluid to eliminate the need for
action is not available with single lever arm (track) closers.
seasonal adjustment.
HOW WILL THE DOORS BE HUNG?
While butt hinges provide the most common method
of hanging doors, some doors are hung on pivots centered in the
door, others on offset pivots. Surface mounted closers will handle
doors hung in any of these three
ways. LCN 4020 Series closers can even control a “balanced” door
installation. Concealed closers may conflict in location with pivot
leaves and thus may
require special templating.
Advanced Variable Backcheck (AVB) is available
with high security and 4110 series closers to begin cushioning the HOW FAR SHOULD THE DOOR OPEN?
opening swing at about 45° (2A) instead of the usual 75° (2). Three basic rules apply to maximum degree of opening.
AVB is especially suited for potentially abusive applications.
1. It is best to let the door swing as far as it can swing freely.
Some closers are mounted in different locations for different
degrees of opening.
2. Use a mechanical stop when a door can not swing 180° or at
the selected hold-open point of a double lever arm system.
The mechanical stop can be mounted on the floor, wall,
overhead, or built into the closer arm.

3. The closer should be positioned so backcheck takes place well
in advance of the stop position to cushion the opening swing
and prevent door and frame damage from an abrupt stop.
Multi-point (ME series) closer/holders can be ordered with a
hold-open bypass at either 80° or 140° function. This feature
does not allow hold-open to take effect until opened beyond the
selected degree of bypass.

A18 LCN Door Control Catalog
phone: 877-671-7011 n fax: 800-248-1460 n www.allegion.com/us n 009426 rev. 11/16