GB-9
D
GB
F
NL
I
E
Commissioning
▷
During the measurement process, ensure that
the length of the tube is as short
as possible for
the determining of the pressures.
VAD
Setting the outlet pressure p
d
▷
The outlet pressure is set to p
d
= 10 mbar at
the factory.
p
d
[mbar]
["WC]
VAD..-25
2.5 – 25
1 – 10
VAD..-50
20 – 50
8 –19.7
VAD..-100
35 – 100
14 – 40
1
Switch on the burner.
▷
Breathing orifice
A
must remain open.
Set the regulator to the required outlet pressure.
+
_
0
p
d
2,5 mm
A
3
Close off the test point again once the pressure
has been set.
VAG
p
d
= outlet pressure
p
sa
= air control pressure
▷
Factory setting: p
d
= p
sa
- 1.5 mbar (0.6 "WC);
actuator pointing upwards and an inlet pressure
of 20 mbar (7.8 "WC).
1
Switch on the burner.
Setting the low-fire rate
▷
In applications with excess air, the values for p
d
and p
sa
may be below the limit, see Technical
data, page 16 (VAG). No situation which would
jeopardize safety must arise. Avoid CO formation.
Set the regulator to the required outlet pressure.
+
_
2,5 mm
0
0
p
d
p
sa
3
Close off the test point again once the pressure
has been set.
Setting the high-fire rate
▷
Set the high-fire rate using restricting orifices or
adjustment elements on the burner.
VAV
p
d
= outlet pressure
p
sa
= air control pressure
p
sc
= combustion chamber control pressure
Setting the low-fire rate
▷
If the burner operates at low-fire rate, the gas/air
mixture can be changed by adjusting the adjust-
ing screw “N”.
-1
0 +0,5
-0,5
–
+1
-1,5
mbar
+1,5
0,6
1
1,5
2
3
N
V
+
+
–
+3
0 -1,5
+1,5
–
-3
+5
mbar
-5
N
+
VAG, VAH
VAV
+
_
,5 mm
+
_
,5 mm
CAUTION
p
sa
- p
sc
≥ 0.4 mbar (≥ 0.15 "WC).
Controller acting time for the reference variable
(air butterfly valve):
min. to max. > 5 s, max. to min. > 5 s.
▷
Factory setting for transmission ratio of gas to air:
V = 1:1, zero point N = 0.
Pre-setting
1
Set zero point
N
and transmission ratio
V
to
scale in accordance with burner manufacturer’s
specifications.
Measure gas pressure p
d
.
0
0
p
d
p
sa
p
sc
0
3
Start the burner at low-fire rate. If the burner
does not start, turn
N
slightly in dir and
repeat start.
4
Gradually increase the burner to high fire and, if
necessary, adjust the gas pressure at
V
.
5
Set the minimum and maximum capacity on
the air control valve in accordance with burner
manufacturer’s specifications.
