Dormakaba 7400 DS User manual

7400 DS/DST/SDS/SDST
Door saver and spring door saver arms
with thumb turn and key turn hold open
Installation instructions
08279441 – 01-2021
| EN |

27400 Surface Applied Closers 01-2021
08279441
dormakaba 7400 DS/DST/SDS/SDST Installation Instructions Table of Contents
Table of contents
1 Technical specifications 3
. Overview 
. Tools recommended 
. Handing the door 
. Closer system 
2 Instructions - parallel mount 4
. Installing (optional) drop plate and
surface closer 
. Secure door saver arms
(DS/DST or SDS/SDST) 
. Secure soffit plate to frame: spacer block,
blade stop, or narrow frame bracket 
. Securing main arm to closer 
. Adjust hold open (DST/DSK units only) 
3 Adjustments 7
. Adjust closing speeds: sweep, latch, backcheck,
delayed action 
. Adjust spring force 
4 Install covers 8

dormakaba 7400 DS/DST/SDS/SDST Installation Instructions
08279441 01-20217400 Surface Applied Closers 3
Technical specifications
1 Technical specifications
. Overview
Caution: sex nuts are required for attachment
of components to unreinforced doors and to
wood or plastic faced composite type fire doors,
unless an alternative method is identified in the
individual door manufacturer’s listings.
Maximum door opening degree is 110°.
Drill bits: # Phillips screwdriver
Metal: /” drill bit; /-
tap
/” flat head screwdriver
Wood: /” and /” bit /”, /”, mm hex key
/” box wrench ” box wrench
. Tools recommended
Table 
. Handing the door
Fig.
Hinge Hinge
Interior side of door
Left hand door (LH) Right hand door (RH)
Exterior side of door
Hold open range is from 85° to 110° with
optional hold open kit.
Know the swing of the door which is being
installed prior to installation.
Verify closer spring size prior to installation.
Make sure door efficiently operates prior to
installing closer.
. Closer system
Fig.
2
6
5
1
7
3
5
. Door closer
. Door saver arm
. Dust cap
. Bumper and screw
. Flat head combo screws
. Pinion screw






LH

dormakaba 7400 DS/DST/SDS/SDST Installation Instructions
08279441 01-20217400 Surface Applied Closers
4
Surface closer and drop plate
Arms
2 Instructions - parallel mount
. Installing (optional) drop plate and surface closer
. Secure door saver arms (DS/DST or SDS/SDST)
Fig.
Fig.
.. Reference templates , .
.. Secure (optional) drop plate and/or closer
body to door.
NOTE: Ensure pinion is oriented away from hinge.
NOTE: NFHD: Do not drill hole in frame for spacer
block.
Pinion
LH RH
8
L
C
L
C
DP
5/32"
5/32"
LH RH
DS/DST units
only
LH RH
Bumper
.. Secure the bumper.
.. Secure spring door
saver (SDS)
mechanism.
SDS/SDST units
only

dormakaba 7400 DS/DST/SDS/SDST Installation Instructions
08279441 01-20217400 Surface Applied Closers 5
Soffit
.. Secure spacer block and
soffit plate to frame.
.. Use included fasteners.
Standard with spacer block With blade stop (BSHD)
With heavy duty narrow
frame bracket (standard with
SDS/SDST) (NFHD)
.. Secure blade stop, spacer block,
and soffit plate to frame.
.. Use included fasteners.
.. Install spacer block using /”
height.
NOTE: If frame width is 4-1/2” or less,
NFHD bracket should be used.
.. Secure NFHD bracket and soffit
plate to frame.
.. Use included fasteners.
Spacer block
Soffit
plate Spacer block
Soffit
plate
Blade stop
Soffit
plate
NFHD
Spacer block
Drill same as soffit plate
Face of stop of BSHD
. Secure soffit plate to frame: spacer block, blade stop, or narrow frame bracket
Fig.
/” /”
/”
stop

dormakaba 7400 DS/DST/SDS/SDST Installation Instructions
08279441 01-20217400 Surface Applied Closers
6
Main arm
Adjust hold open
. Securing main arm to closer
Fig.
.. Rotate pinion ° to pre-load.
.. Attach arm PARALLEL to door.
LH
45° 45°
L
CC
L
RH
. Adjust hold open (DST/DSK units only)
Fig.
.. Engage hold open: Open door
until mechanism locks onto ball
on plate.
.. Tighten thumb turn or key turn
until desired hold open force is
met.
Key turn
Thumb
turn
Ball

dormakaba 7400 DS/DST/SDS/SDST Installation Instructions
08279441 01-20217400 Surface Applied Closers 7
Adjust closing speeds
3 Adjustments
Confirm closer spring size prior to making any
closing speed adjustments.
Do not back valve heads out beyond closer casting.
Door should close in  to  seconds from º.
Maximum opening angle is º.
Do not close valves completely.
. Adjust closing speeds: sweep, latch, backcheck, delayed action
Check delayed action (DEL) function if supplied.
 meets lb interior barrier-free requirements.
If necessary, adjust closer spring and test pull
forces until proper forces are obtained.
Ball bearing hinges and pivots should always be
used.
Increase
Decrease
Increase
Decrease Backcheck
Sweep, latch,
delayed action
+
-
+
-
+
-
+
-
-
+
BC
DA
L
S
Fig.

dormakaba 7400 DS/DST/SDS/SDST Installation Instructions
08279441 01-20217400 Surface Applied Closers
8
Adjust spring force
Secure covers
. Adjust spring force
Fig.
Parallel mount
Closer size Max door
weight (lbs)
Door width Full turns
Interior Exterior

  ’-” --- 
  ’ ’” +
  ’” ’ +
  ’ ’” +
4 Install covers
Fig.
13
6
COV
FC
FCSL
+
-
-
+
BC

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