G-U ELTRAL K25, Инструкция по установке и эксплуатации, Страница: 22 / 32

22
Chain drive
Installation and operating instructions
ELTRAL K25 - 24 V | ELTRAL K25 Synchro - 24 V
6 Calculating the opening and closing force
NOTE
With the formulae indicated below it is possible to determine the approximate
force required to open or close a (smooth-running) window.
The windows are assumed to be smooth-running. Possible snow loads are
to be considered.
NOTE
The application formula considers only tilt and top-hung windows.
The permissible drive force is speci
fi ed in the technical data in chapter „4
Technical data (1 motor)“ on page 20.
If the values you calculated exceed the max. allowed force, please contact
Gretsch-Unitas GmbH Baubeschläge.
 
 
For vertically installed bottom-hung or top-hung windows
Calculating the drive force depending on the sash weight P
F
g
= 5.4 x P x C / H
Calculating the drive force depending on the wind load F
W
F
K
= F
W
x A / 2
Calculating the drive force depending on sash weight and wind load
F= F
g
+ F
K
Wind loads depending on the
building height
Height
F
w
0 - 8 m 500 N/m²
8 - 20 m 800 N/m²
20 - 100 m 1100 N/m²
> 100 m 1300 N/m²
F, F
g
, F
K
= opening/closing force [N]
P = sash weight [kg]
A = window area[m²]
H = sash height [mm]
C = opening width of sash [mm]
F
w
= wind load [—]
5,4 = constant calculated in advance [—]
m
s²
N
m²