Dungs GW A4 Series Manual
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Compact pressure switch
for gases and air
GW A4
Pressure limiters
ÜB A4 and NB A4
Double pressure switches
GW A4/ GW A4
5.02
Technical description
The GW A4 pressure switches, the
pressure limiters ÜB A4 and NB A4
and the double pressure switch GW
A4 / GW A4 are adjustable pressure
switches for automatic burner controls.
They are suitable for switching a cir-
cuit on, off or over on changes in
actual pressure value relative to the
set reference value.
The reference value (switching point) is
adjusted on a setting wheel provided
with a scale. Test nipple integrated in
metal housing as standard.
Application
Pressure monitoring in firing, ventila-
tion and air-conditioning systems.
Suitable for gases of families 1,2,3 and
other neutral gaseous media.
Approvals
EU type test approval as per EU Gas
Appliance Directive. TÜV (German
Technical Inspectorate) inspection for
pressure switches of special construc-
tion as per TRD 604 and VdTÜV Tech-
nical Data Sheet, edition 100/1, as
well as Class "S" as per EN 1854.
GW...A4
CE-0085 AO 0012
ÜB...A4
CE-0085 AO 0026
NB...A4
CE-0085 AO 0039
Approvals in other important gas-con-
suming countries. Special designs for
the North American market with U
FM and CSA registrations.
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