The NHN400 Series overhead door closer offers a comprehensive range of hydraulic, power adjustable door closers to suit all applications.
The NHN400 Series door closers are current with modern designs offering two speed adjustment valves available at the front of the body for easy control of closing and latching. NHN400 Series are power adjustable by screw, whilst NHN 420 Series are power adjustable by position.
Slimline Square Body with Cover & Accessories.
EN Standard Power Adjustable EN 1154. Fire Tested.
- NHN400 Series offers sizes EN2-5, spring power adjustable by power adjustment screw.
- NHN420 Series offers sizes EN2-4, by position of door closer body
- Back check and delayed action functions available.
- Easy installation.
- Easy speed control adjustments by valve screws at the front of the closer body
- Slim and modern body.
- Non-Handed applications.
- Comprehensive range of accessories including stainless steel and brass finishes.
- RAL9006 finish as standard with others available.
NHN 400 & 420 are CE approved to EU directives (89/106/EEC) by the EN 1154:1996/A1:2002 and EN1634-1:2000.
Guarantee – A free replacement ex-works if any closer proved defective by reason either of faulty manufacture or defect in materials.
| Model | 400 | 420 | |
|---|---|---|---|
| Variable Closing Force | Spring Strength (EN) | 2 to 5 | 2 to 4 |
| Standard Doors | < 850mm | <40kg | 400 | 420 |
| < 950mm | < 60kg | 400 | 420 | |
| <1100mm | <80kg | 400 | 420 | |
| <1250mm | <100kg | 400 |
Model chart
400 Series
| Power Size | Standard Arm | Hold Open | Back Check | Delayed Action | Slide Arm | Parallel Bracket |
| 2 | 400 | 400S | 400BC | 400DA | 400GL | 400P |
| 3 | ||||||
| 4 | ||||||
| 5 |
420 series
| Power Size | Standard Arm | Hold Open | Back Check | Delayed Action | Slide Arm | Parallel Bracket |
| 2 | 420 | 420S | 420BC | 420DA | 420GL | 420P |
| 3 | ||||||
| 4 |
Function
Closing & Latching Speed
The closing speed from maximum opening angle to 15° and the latching speed from 15° to 0° can easily be controlled by two independent valves at the front of the closer.
Back Check Function
This function is built into the closer body and check the outward swing of the door. Most suited where the opening might hit a wall i.e. In a corridor or where it could injure someone if it opens too quickly. It is recommended for use on externally opening doors in windy environment. The back check function work between 70° and 85°. The back check strength can be adjusted by turning the back check valve screw located at the front of the closer body. IT SHOULD NOT BE REGARDED AS A DOOR STOP!
Delayed Action Function
This function reduced the closing speed of the door to allow passers by sufficient time to pass thought the door opening i.e.. People in wheelchairs, hospital staff with beds, elderly people etc… The maximum delay of 60° second is achieved from the 180° (fully open angle) through to 85°. After which the normal closing process takes effect to provide secure and complete closure of the door. The duration of the delay can be adjusted via the delay screw located on the front of the closer body.
Adjustment
For easy adjustment the closing speed screw, the latching speed screw, the back check screw(if fitted) and the delayed action screw (if fitted) are located at the front of the closer body.
The power adjustment screw by no.400 Series is located at the short side of the closer body. The manual show the setting and the number of turn required to change the power force of the no. 400 closer body and the right position of the eccentric shoe.
The no. 400 and no. 420 Series door closer are designed to allow the door opening angle of 180 by using butt hinges with a maximum offset of 10mm. Using the door closers top jamb application, parallel arm application or with hinges with a different offset can limit the maximum opening angle of the door.
400GL Series – Slide Arm
By the use of a slide arm in combination with a design cover gives a stylish look to the no.400 Series door closer. The slide arm is also recommended in situations where vandalism often appears.
The slide arm can be fixed on to the front of the door frame for regular applications, underneath for out swinging door applications or in top jamb applications. A hold open unit is available to keep the door open at the desired position.
The no. 400 models with slide arm are suitable for doors up to a weight of 80kg and a width of 1100mm. The no.420 models with slide arm are suitable for doors up to a weight of 60kg and a width of 100mm.
Standard Installation
Closer mounted hinge side of door.
Illustration show NHN400 door closer with standard arm in right handing configuration (DIN L)
| Turns | Force | Max. Door Width | |
| -5 |  |
EN2 | 850mm |
| 0 | EN3 | 950mm | |
| 3 | EN4 | 1100mm | |
| 6 |  |
EN5 | 1250mm |
Top Jamb Installation
Closer mounted opposite hinge side of door.
Using the door closer in top jamb application might reduce the maximum opening angle of the door.
Illustration show NHN400 door closer with standard arm in top jamb right handing configuration (DIN L)
Parallel Arm Installation
Closer mounted opposite hinge side of door.
Using the door closer in the parallel arm application with the optional parallel bracket will weaken it by one size. The maximum door opening angle of the door might be reduced.
Illustration show NHN400 door closer with the parallel bracket in the left handing configuration (DIN R)
Slide Arm Installation
Closer mounted hinge side of door.
The slide arm is included as standard a hold open device, which can easily be adjusted or removed. The slide arm can also be fitted underneath the top frame for out swinging applications or in top jamb applications.
Illustration show NHN400GL door closer with right handing configuration (DIN L)
