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Parameters
4 .5 .5 Tightness controll, test period t
Parameter 26
BCU..D3 only
Defines the tightness control test period t
solenoid valves. It can be set to 10, 20 or 30 to 250 sec-
onds.
Depending on the burner capacity, the tightness of the
gas solenoid valves must be checked in accordance
with the relevant application standard, e.g. EN 676,
EN 746, NFPA 85 and NFPA 86.
The sensitivity of the tightness control can be adjusted
individually by adapting the test period t
age rate Q
is to be detected, a long test period t
L
be set. The test period t
time t
, 3 s opening time t
W
The test period t
is calculated from the inlet pressure
P
p
[mbar (psig)], the leakage rate Q
u
the test volume V
[l (ft
P
p
t
= 4 x
P
Leakage rate
The tightness test allows a check to be made for a spe-
cific leakage rate Q
. In countries where the standards
L
and Directives of the European Union are applicable,
the maximum leakage rate Q
flow rate Q
[m
3
(ft
(N) max.
BCU 370 · Edition 01.19
P
for the gas
P
. If a low leak-
P
is the sum of the waiting
P
and measurement time t
L
[l/h (ft
3
/h)] and
L
3
)].
[l]
[mbar] x V
u
P
+ 1 s
Q
[l/h]
L
is 0.1% of the maximum
L
3
)/h (n)].
Leakage rate Q
Test volume V
The test volume V
ume V
(for 2 valves VG), added to the volume of the
G
pipe V
for each additional metre in length L:
M
must
P
Basic volume V
DN
.
Litres
M
10
0.01
15
0.07
20
0.12
25
0.2
40
0.7
50
1.2
65
2
80
4
100
8.3
125
13.6
150
20
200
42
Q
[m
3
/h] x 1000 [l/h]
(N) max.
=
[l/h]
L
1000 x 1 [m
P
is calculated from the basic vol-
P
L
V
= V
P
Volume per metre V
G
Quarts
Litres
0.011
0.1
0.074
0.2
0.127
0.3
0.21
0.5
0.74
1.3
1.27
2
2.11
3.3
4.23
5
8.77
7.9
14.37
12.3
21.13
17.7
44.38
31.4
3
/h]
+ L
V
x
G
M
M
Quarts
0.11
0.21
0.32
0.53
1.37
2.11
3.49
5.28
8.35
13
18.7
33.18
54
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