FCU 500, FCU 505 · Edition 02.17
43
Valve proving system
tL = P59
tM = P56
+
–
tL = P59
tM = P56
pZ >
pu
2
+
–
V2
OK
pZ >
pu
2
V1
OK
V1
V2
OK
V1
V1
V1
OK
V2
V2
V2
V1
V2
pZ >
pu
2
+
–
pZ >
pu
2
+
–
tL = P59
tM = P56
V1
V1
tL = P59
tM = P56
V2
V2
pZ >
pu
2
+
–
tL3 = P55
V3
Vp2 OK
Vp1
OK
pZ >
pu
2
+
–
tL = P59
tM = P57
V1
V2
V3
V1
Vp2
Program
A
Program
B
Program
A
Program
B
Vent V
p2
Test of valve 1
V
p1
Test of valve 2
V
p1
Test of valve V3
and
burner-side
valves
V
p1
+ V
p2
Wait for 1 s
END
START
Program A
Valve V1 opens for the opening time t
L
set in param-
eter 59. Valve V1 closes again. During the measure-
ment time t
M
set in parameter 56, the tightness control
checks the pressure p
Z
between the valves V1 and V2.
If pressure p
Z
< p
u
/2, valve V2 is leaking.
If pressure p
Z
> p
u
/2, valve V2 is tight.
Valve V2 opens for the opening time t
L
set in param-
eter 59. V2 closes again. During the measurement
time t
M
, the tightness control checks the pressure p
Z
between the valves.
If pressure p
Z
> p
u
/2, valve V1 is leaking.
If pressure p
Z
< p
u
/2, valve V1 is tight.
The test volume V
p1
has been successfully checked for
tightness.
For checking the second test volume, see page 45
(Checking the first and second test volumes (V
)).
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