Understanding UniFi Door Closer
The UniFi Door Closer (UACC-DoorCloser), available in US and EU models, lets you fine-tune how your door opens and closes—no UniFi Access Control Hub needed. Mounted directly on the door, it ensures smooth, quiet, and safe operation. This article explains the key terms from the installation guide (US | EU) to help you adjust the Door Closer for optimal performance. If you're looking to wire a door operator to the Access Control Hub, click here.
Phases of Door Movement
Backcheck Speed
- Function: Adds resistance when the door is forcefully opened (typically beyond 70°–85°).
- Purpose: Prevents damage from strong pushes or wind. Helps protect the door, walls, and people nearby.
Closing Speed
- Function: Controls how fast the door moves from fully open to about 15° before closing.
- Purpose: Ensures a smooth and safe closing motion. Prevents slamming and supports controlled movement.
Latching Speed
- Function: Regulates the final 10–15° of the door closing, right before it latches.
- Purpose: Ensures the door latches securely without bouncing or slamming. Supports a quiet and secure close.
Spring Force
Door closers use internal springs to control the speed and force of a door closing. According to US or EU standards, different doors require different spring forces based on size and weight.
-
Use a screwdriver to turn the spring tension screw to shift between forces.
-
Clockwise (+) = stronger force
-
Counter-clockwise (−) = weaker force
-
- Always test door closing after each adjustment to ensure safety and compliance.
US Standard (Sizes I to VI)
- Used mainly in North America.
-
Factory default is typically Size III.
- Adjust using clockwise turns to increase from Size I up to Size VI.
- Example: To go from Size III to Size V, turn the adjustment screw about +6 to +9 turns clockwise.
For Standard Mount and Top Jamb Installation
| Door Width | Interior / Exterior Door | Closer Size | Opening Angle & Number of Turns |
| ≤ 30″ (762 mm) | Interior | Size I* | 100°: -9 130°: -9 180°: -10 / -11 |
| Exterior |
Size III |
100°: 0 130°: 0 180°: 0 |
|
|
~36″ (914 mm) |
Interior | Size II | 100°: -5 130°: -4 180°: -5 |
| Exterior |
Size IV |
100°: +4 130°: +5 180°: +5 |
|
|
~42″ (1067 mm) |
Interior |
Size III |
100°: 0 130°: 0 180°: 0 |
| Exterior |
Size V |
100°: +9 130°: +10 180°: +10 |
|
|
~48″ (1219 mm) |
Interior |
Size IV |
100°: +4 |
| Exterior |
Size VI |
100°: +12 |
For Parallel Arm Installation
| Door Width | Interior / Exterior Door | Closer Size | Opening Angle & Number of Turns |
| ≤ 30″ (762 mm) | Interior | Size I* | 120°: -11 180°: -10 |
| Exterior |
Size III |
120°: 0 |
|
|
~36″ (914 mm) |
Interior | Size II | 120°: -5 180°: -4 |
| Exterior |
Size IV |
120°: +6 180°: +7 |
|
|
~42″ (1067 mm) |
Interior |
Size III |
120°: 0 180°: 0 |
| Exterior |
Size V |
120°: +13 180°: +13 |
|
|
~48″ (1219 mm) |
Interior |
Size IV |
120°: +6 |
* Door Closer Size I is not covered by CAN/ULC S133 and is not intended for use on fire or exit doors.
EU Standard (EN2–EN6)
- Used mainly in Europe.
- Factory default is typically EN3.
- Adjust using clockwise turns to increase from EN2 up to EN6.
- Example: To go from EN3 to EN5, turn the adjustment screw about +6 to +9 turns clockwise.
For Standard Mount and Top Jamb Installation
| Max Door Width | Max Door Weight | Force Level | Max Opening Angle | Number of Turns | Door Closer Arm Direction* |
| 850 mm | 40 kg | EN2 | 180° | 0 |
— |
| 950 mm | 60 kg | EN3 | 180° | 0 ~ +3 |
— |
| 1100 mm | 80 kg | EN4 | 180° | +3 ~ +6 |
Clockwise |
| 1250 mm |
100 kg |
EN5 | 180° | +6 ~ +9 |
Clockwise |
| 1400 mm | 120 kg | EN6 | 180° | +9 ~ +12 |
Clockwise |
* See the images below for the door closer arm direction.
For Parallel Arm Installation
| Max Door Width | Max Door Weight | Force Level | Max Opening Angle | Number of Turns | Door Closer Arm Direction* |
| 850 mm | 40 kg | EN2 | 180° | 0 ~ +2 |
— |
| 950 mm | 60 kg | EN3 | 180° | +2 ~ +6 |
— |
| 1100 mm | 80 kg | EN4 | 180° | +6 ~ +9 |
Clockwise |
| 1250 mm |
100 kg |
EN5 | 180° | +9 ~ +12 |
Clockwise |
* See the images below for the door closer arm direction.