Dorex 1901 - User Manual

REGULAR MOUNT
(PULL SIDE)
TOP JAMB MOUNT
(PUSH SIDE)
PARALLEL MOUNT
(PUSH SIDE)
Latching
(F) Faster
(S) Slower
Backcheck
(–) Softer
(+) Harder
F
S
F
S
_
+
1
2
3
Closing
(F) Faster
(S) Slower
PARALLEL ARM INSTALLATION
CLOSER MOUNTED ON DOOR ON PUSH SIDE
This drawing shown is RIGHT HAND DOOR, for LEFT HAND DOOR install opposite
Page 1
SPRING POWER ADJUSTMENT
SPRING POWER SIZE
TURNS
REQUIRED
5 lb-f*
8.5 lb-f*
Factory Preset
8 TURNS CCW
4 TURNS CCW
0 TURNS
1
2
3
4
5
6
8 TURNS CW
12 TURNS CW
4 TURNS CW
1901-ARMF-INST 2021-01
INSTALLATION INSTRUCTIONS
DOOR HANDING
SPRING POWER ADJUSTMENT
CONTROL RANGE
PULL
SIDE
PULL
SIDE
PUSH
SIDE
PUSH
SIDE
LEFT
HAND
DOOR
RIGHT
HAND
DOOR
Refer to installation instructions supplied with door closer for more details
DOOR CLOSER INSTALLATION
1. Refer to installation instructions supplied with door closer.
2. Adjust spring power to match door size as indicated in chart on page 1.
3. Mount door closer on door using dimensions for the selected door opening
angle, with speed control valves facing away from the hinges.
4. Mount parallel arm bracket on frame stop soffit using dimensions for the
selected door opening angle.
5. Disconnect main arm from the forearm. Using a wrench on the door closer
bottom shaft rotate shaft about 45° towards the hinges and place main arm
on door closer top shaft and attach with screw.
6. Attach forearm (friction arm) shoe on the parallel arm bracket with two
machine screws. Position hold-open adjusting nut on top for right hand (RH)
door or bottom for left hand (LH) doors.
7. Close door, loosen hold-open adjusting nut (turn clockwise), and position
main arm parallel to the door surface and adjust length of threaded rod of
forearm to connect to the main arm. Secure forearm (friction arm) to main
arm with screw.
DOOR CLOSER ADJUSTMENTS
1. Refer to adjustment instructions supplied with door closer and pictorials on
page 1.
2. Adjust closing speed and latch speed so that the door closes for a 120° door
opening position within 6-7 seconds, evenly divided between sweep speed
and latch speed.
3. To adjust the hold-open position, open the door to the desired opening angle
and tighten the adjusting nut (turn counterclockwise) on the friction arm.
Close and open the door and verify that the hold open works.
4. Adjust backcheck if required.
COVER INSTALLATION
1. Place cover over door closer and attach with supplied screws.
2. Place shaft cover on the exposed door closer shaft.
Soffit
Parallel Arm
Bracket
Main
Arm
Page 4
LEFT
HAND
RIGHT
HAND
Soffit
Parallel Arm
Bracket
45° Preload
Main
Arm
Forearm
Preload 45°
Door opens to
the outside
Door opens to
the outside
INSTALLATION DIMENSIONS
OPENING
TO 120°
A
9-1/8
121°TO 180°
5-7/8
INCH
mm
241
178
B
6-1/8
2-9/16
INCH
mm
156
65
HIGHER
Clockwise (CW)
LOWER
Counterclockwise (CCW)
CCW : Counterclockwise CW: Clockwise
* pound (force)
Illustrations for reference only, actual door closer style and shape and arm may vary.
A
B
9/16
(14)
9/16
(14)
4-3/4
(120)
1-3/8
(35)
1-3/8
(35)
1
(25)
1
(25)
5/16”
(8)
11/16
(17)
11-1/8
(283)
3-3/8
(86)
INCH
(MM)
INCH
(mm)
Hold-Open
Adjusting Nut
Hinges
Centerline
DAS L BC
SPRING POWER ADJUSTMENT
WITH FRICTION HOLD OPEN ARM (1901-ARMF)

Summary

DOREX 1901 Parallel Arm Installation

Door Closer Installation Procedures

Step-by-step guide for mounting the door closer and parallel arm components on the door.

Door Closer Adjustment Instructions

Guidance on adjusting closing speed, latch speed, hold-open, and backcheck.

Cover and Shaft Installation

Instructions for fitting the external cover and the shaft cover onto the door closer.

Spring Power and Door Handing

Spring Power Adjustment Chart

Table and details for selecting and adjusting spring power based on door size.

Door Handing Identification

Visual information to correctly identify left-hand and right-hand door configurations.

Regular Arm Installation Details

Regular Arm Door Closer Installation

Specific installation steps for the regular arm closer on the pull side of the door.

Regular Arm Door Closer Adjustments

Adjusting speeds and hold-open for the regular arm installation.

Top Jamb Installation Details

Top Jamb Door Closer Installation

Specific installation steps for the top jamb closer on the push side of the door.

Top Jamb Door Closer Adjustments

Adjusting speeds and hold-open for the top jamb installation.

Overview

1. Function Description
2. Important Technical Specifications
3. Installation Dimensions (Parallel Mount - Push Side)
4. Installation Dimensions (Regular Mount - Pull Side)
5. Installation Dimensions (Top Jamb Mount - Push Side)
6. Spring Power Adjustment
7. Control Range
8. Usage Features
9. Maintenance Features

The Dorex 1901 is a door closer with a friction hold-open arm (1901-ARMF) designed for various mounting configurations: Regular Mount (Pull Side), Top Jamb Mount (Push Side), and Parallel Mount (Push Side). This device is intended to control the closing and latching of doors, offering adjustable spring power, closing speeds, and a hold-open function.

Function Description:

The primary function of the Dorex 1901 is to provide controlled door closing, preventing slamming and ensuring the door latches properly. It incorporates a hydraulic mechanism that regulates the door's speed throughout its closing arc. A key feature is the friction hold-open arm, which allows the door to be held open at a desired angle, providing convenience for passage or ventilation. The device is handed, meaning specific installation instructions apply for right-hand and left-hand doors, with opposite installations required for the alternative hand.

Important Technical Specifications:

Installation Dimensions (Parallel Mount - Push Side):

• Opening Angle 1° to 120°:
  • Dimension A: 9-1/8 inches (241 mm)
  • Dimension B: 6-1/8 inches (156 mm)
• Opening Angle 121° to 180°:
  • Dimension A: 5-7/8 inches (178 mm)
  • Dimension B: 2-9/16 inches (65 mm)
  • Closer mounting on door: 11/16" (17mm) from hinge centerline to closer body edge, 4-3/4" (120mm) from top of door to closer body top edge.
  • Parallel arm bracket mounting on frame stop soffit: 1-3/8" (35mm) from hinge centerline to bracket edge, 1-3/8" (35mm) from top of frame to bracket top edge.

Installation Dimensions (Regular Mount - Pull Side):

• Opening Angle 101° to 130°:
  • Dimension A: 7-3/32 inches (180 mm)
• Opening Angle 131° to 180°:
  • Dimension A: 3-15/16 inches (100 mm)
  • Closer mounting on door: 5-1/2" (140mm) from hinge centerline to closer body edge, 7/8" (22mm) from top of door to closer body top edge.
  • Forearm shoe mounting on door frame: 1-3/4" (44mm) from hinge centerline to shoe edge, 1-7/16" (36mm) from top of frame to shoe top edge.

Installation Dimensions (Top Jamb Mount - Push Side):

• Opening Angle 101° to 130°:
  • Dimension A: 7-3/32 inches (180 mm)
• Opening Angle 131° to 180°:
  • Dimension A: 3-15/16 inches (100 mm)
  • Closer mounting on frame top jamb: 1-3/4" (44mm) from hinge centerline to closer body edge, 1-3/4" (44mm) from top of frame to closer body top edge.
  • Forearm shoe mounting on door: 5-3/8" (136mm) from hinge centerline to shoe edge, 1/2" (13mm) from top of door to shoe top edge.
  • Reveal requirement: 2 1/2" (63.5 mm) minimum. Longer forearm rods are available for reveals greater than 2 1/2".

Spring Power Adjustment:

The spring power is adjustable to accommodate different door sizes and weights. The adjustment is made by turning a screw, with specific turns required for each power setting:

• Spring Power Size 1 (5 lb-f): 8 turns Counterclockwise (CCW)
• Spring Power Size 2 (8.5 lb-f): 4 turns CCW
• Spring Power Size 3 (Factory Preset): 0 turns
• Spring Power Size 4: 4 turns Clockwise (CW)
• Spring Power Size 5: 8 turns CW
• Spring Power Size 6: 12 turns CW (lb-f = pound force)

Control Range:

The door closer features adjustable valves for controlling the closing sequence:

• Closing Speed (F/S): Adjusts the speed of the door from its full open position down to the latching range. "F" indicates faster, "S" indicates slower.
• Latching Speed (F/S): Adjusts the speed of the door in the final few degrees of closing, ensuring it latches securely. "F" indicates faster, "S" indicates slower.
• Backcheck (+/-): Adjusts the resistance the door encounters when opened forcefully beyond a certain point, preventing damage to the door and frame. "+" indicates harder, "-" indicates softer.

Usage Features:

• Versatile Mounting: Can be installed in three common configurations (Regular, Top Jamb, Parallel) to suit various door and frame types and aesthetic preferences.
• Handing Specific Installation: Clear instructions for right-hand and left-hand doors ensure correct orientation and function. For parallel mount, the drawing shows a right-hand door, and for left-hand doors, the installation is opposite. For regular mount, the drawing shows a left-hand door, and for right-hand doors, the installation is opposite. For top jamb mount, the drawing shows a right-hand door, and for left-hand doors, the installation is opposite.
• Adjustable Hold-Open: The friction arm allows the door to be held open at any desired angle by tightening an adjusting nut. This feature can be disengaged by loosening the nut.
• Controlled Closing: Prevents doors from slamming, enhancing safety and reducing wear and tear on the door and frame.
• Speed Control: Independent adjustment of closing and latching speeds provides fine-tuning for optimal door operation, typically aiming for a 6-7 second closing time from 120° opening.

Maintenance Features:

• Adjustable Components: All critical functions—spring power, closing speed, latching speed, backcheck, and hold-open position—are adjustable after installation, allowing for fine-tuning and compensation for changes in door weight, environmental conditions, or user preference.
• Covered Mechanism: The closer body is covered by a protective cover, and the exposed shaft is covered by a shaft cover, protecting internal components from dust and damage while providing a clean aesthetic.
• Clear Adjustment Instructions: The manual provides detailed pictorials and instructions for all adjustments, making maintenance straightforward.
• Durable Construction: Designed for long-term use, with components built to withstand repeated door cycles.

Dorex 1901 Specifications

General

Brand	Dorex
Model	1901
Category	Door Opening System
Language	English