TC · Edition 08.17 13
Application
1.1.7
TC 3 in a multiple burner system with several valves
installed in series
V1 and V2: any.
TC 3 checks slow opening main valves V1 and V2 and
the pipe between these valves for tightness.
The test volume V
P
is supplied and discharged via the
TC 3 auxiliary valves.
Valve V2 can only be checked for tightness when the
pressure downstream of V2 approximately corresponds
to the atmospheric pressure and the volume down-
stream of valve V2 is 5 x V
P
. The gas solenoid valve VAS
and the pressure switch DG
VAS
are used to relieve the
pressure. The pressure switch must be adjusted in such
a way so that enough pressure is relieved and no air can
get into the pipework.
Once the tightness test has been carried out success-
fully, TC 3 opens the main valves V1 and V2 with the
OK enable signal and enables the downstream burner
control units.
K1
DG
VAS
VAS
VAS
DG
VAS
PZ
TC 3
OK
9
V1 V2
p
u
p
z
V
P
PZ
TC 3
p
u
2
p
u
p
d
K1
V1
V2
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