FCU 500, FCU 505 · Edition 02.17
110
Parameters
12 .5 .4 Pressure reduction V
p2
Parameter 54
Can only be programmed if P53 = 3.
To check the system tightness with two test volumes
(V
p1
and V
p2
), the time when the pressure of test vol-
ume V
p2
should be reduced is defined in parameter 54.
Parameter 54 = 0: in standby
Parameter 54 = 1: upon start-up
12 .5 .5 Opening time relief valve V3
Parameter 55
Can only be programmed if P53 = 3.
Parameter 55 is used to define the time (0 to 6500 s)
required to reduce the pressure of test volume V
p2
be-
fore the valve check of test volume V
p1
is started.
12 .5 .6 Measurement time V
p1
Parameter 56
The required measurement time must be determined
according to the requirements of the appropriate appli-
cation standards, e.g. EN 1643.
The required measurement time for the tightness test
of V
p1
can be set using parameter 56. The possible set-
tings are 3 s, 5 to 25 s (in 5 s steps) or 30 to 3600 s (in
10 s steps).
See also page 53 (Measurement time t
12 .5 .7 Measurement time V
p1
and V
p2
Parameter 57
For a system leak tightness check, the pressure of test
volume V
p2
is first reduced. The test volume V
p1
is then
tested. Valve V2 is opened to check the test volume V
p2
,
thus making a connection between V
p1
and V
p2
. V
p1
and V
p2
are then filled via V1.
The required measurement time for the tightness test of
V
p1
and V
p2
(checking relief valve V3, the burner valves
and the pipework) can be set using parameter 57. The
possible settings are 3 s, 5 to 25 s (in 5 s steps) or 30 to
3600 s (in 10 s steps).
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