BCU 370 · Edition 01.19 29
VG
VG
IC 20
BVA
GIK
L1
V1 V2
45
DG
min
9 3
VG..L
V3
632
23
21
24
13
17
18
19
20
25
BCU 370..D3
DL
DL
7
DG
M
22
DG
11
DG
p
u
/2
UVS
29 3130
26
28
90° ➔ 0
0 ➔ 90°
Function
Downstream of the gas solenoid
valve V2 on the burner side, the pipe
to the burner must be open so that
the space between valves V1 and V2
can be vented.
The pressure switch DG moni-
tors the pressure between the two
valves. It must be set to half of the
inlet pressure p
u
/2 in order to check
both valves with equal sensitivity.
In pilot/main burner systems with
three gas solenoid valves, V2 and
V3 are checked simultaneously.
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