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Start-up
Gas pressure switch
Air pressure switch
Gas pressure switch GW...A5/A6
The pressure switch can be used to
monitor either falling pressure (min.) or
increasing pressure (max.).
Types GW...A5/A6 are EC-type-tested
and certified in accordance with the EC
Gas Appliances Directive and EC Pres-
sure Equipment Directive. Class “S” as
defined by EN 1854 and TÜV-tested as
a pressure switch of special type for
use in heating installations of steam
and hot-water boilers in accordance
with TRD 604 and VdTÜV information
sheet pressure 100/1.
The nominal value (switch point) is
adjusted using an adjustment wheel
with scale.
Use:
GW ... A5 for dual solenoid valves
GW ... A6 for individual solenoid or
motor valves
Verbundregler für EK
Gas pressure switch A5
Verbundregler für EU
Gas pressure switch A6
Technical data:
Type of gas:
Gases according to DVGW Worksheet
G 260/1, gas families 1, 2, 3
Degree of protection: IP 54
Ambient temperature: -15°C to +60°C
Mounting position: any
Operating pressure up to:
GW 50/150 A5A6
500 mbar
GW 500/ A5/A6
600 mbar
Adjusting range:
GW 50 A5/ A6 5-50 mbar
GW 150 A5/ A6 10-150 mbar
GW 500 A5/ A6 100-500 mbar
Air pressure switch
The air pressure switch is provided for
monitoring the pressure of the combu-
stion air fan.
The pressure switch DL 50A has been
designed for switching on, off or over an
electric circuit in the case of changes of
the actual pressure levels from the set-
point setting. The pressure switch DL
50A can be used as overpressure,
vacuum or differential pressure monitor
for air and non-aggressive gases but
not for gases according to DVGW
Worksheet G 260/l.
Determining the differential pre-
flushing pressure and adjusting the
differential pressure switch
• Burner in the pre-aeration phase.
• Measure pressure on test
connection (2).
• Measure vacuum on test
connection (3).
• Add the measured pressures.
• Set the scale to 90% of the calculated
value.
Certification
The pressure switch is registered by
CE/DIN-DVGW.
Switch function test
Test buttons are provided to check the
switch functions for proper operation
(with safety cut-out and interlock). The
burner is normally run in partial-load
condition when testing the safety
functions. On pressing button (4) the
vacuum will be removed which causes
the differential pressure to drop below
the required level. If it is necessary to
test the pressure switch functions under
full-load conditions this may be done by
pressing button (1).
12/2011 14 072 205
Summary of Contents for Low-NOx N10.12000.30 G-EU2
Page 33: ...34 Manufacturer s declaration...
