LCN® 4010, 4020, & 4110 Series

Door Closers with Fusible Link Arms

Installation Instructions

The Fusible Link Arm is handed and cannot be reversed. The hand of the arm and the hand of the door must correspond. The hand of the arm is stamped on the vertical part of the shoe facing the Hold Open Nut. This arm can only be used with Size 1-5 closers.

1. Model 4010

1a. For all degrees of door opening: Increase the following dimension: Vertical distance from top jamb line to center of the shoe screw is increased from 5/8" to 1".

1b. For 90° to 100° opening: Increase the following dimensions:

(Regular & 4010-18 Drop Plate Mount) Distance from jamb edge to center of the first screw on the shoe is increased from 12 5/16" to 13 5/16".
(Regular Mount) Distance from door edge to center of the first screw on the closer body is increased from 7" to 8".
(4010-18 Drop Plate Mount) Increase from 6 7/16" to 7 7/16".

Hold open nut must be on top. (See Fig. 1)

Fig. 1: Diagram illustrating the 4010 model, showing the hold open nut positioned on top.

2. Model 4020 (3 7/8" Maximum Reveal)

2a. Increase the vertical distance from the top door edge to the center of the shoe screw by the following dimensions:

(No Drop Plate) Increased from 5/8" to 1".
(4020-18 Drop Plate) Increased from 1 3/4" to 2 1/8".
(4020-18G Drop Plate) Increased from 2 1/2" to 2 7/8".

Hold open nut must be on bottom. (See Fig. 2)

Fig. 2: Diagram illustrating the 4020 model, showing the hold open nut positioned on the bottom.

3. Model 4110

3a. (Regular Mount) Vertical distance from stop face of frame to top screw on closer body is increased from 2 3/16" to 2 3/4".

3b. (4110-18 Drop Plate Mount) Vertical distance from stop face of frame to top screw on drop plate is increased from 3/4" to 1 5/16".

3c. Hold open nut must be on top. (See Fig. 1)

3d. Requires installing the fusible link parallel arm soffit shoe (See Fig. 3) to standard shoe templating.

Fig. 3: Diagram showing the fusible link parallel arm soffit shoe being installed according to standard shoe templating.

4. To Adjust Hold Open

4a. Arm is pre-set to hold open at approximately 90°.

4b. To change setting: Loosen adjusting nut; open door to 5° to 7° before the desired hold open position; firmly tighten adjusting nut.

Fig. 4: Diagram of the fusible link arm mechanism, detailing the KEY, LEVER BARS, and FUSIBLE LINK, which align when the door is returned to its original hold-open position.

5. If Fusible Link Requires Replacement, Reassemble As Follows

5a. Return door to original hold open position. This will automatically line up key & lever bars. (See Fig. 4)

5b. With pliers, carefully squeeze lever bars together just enough to install fusible link. DO NOT USE EXCESSIVE FORCE.

Customer Service

Phone: 1-877-671-7011

Website: www.allegion.com/us

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