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TC · Edition 07.14
10
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1 .1 .4 TC 2 with two gas solenoid valves
Tightness control TC 2 checks gas solenoid valves V1
and V2 for tightness.
If both valves are tight, the tightness control
forwards the OK enable signal to the automatic
burner control unit GFA. This opens valves V1 and V2
simultaneously. The burner starts.
V1 and V2: quick or slow opening valves with start
rate.
A
= Supply and signal
forwarding
B
= Automatic
burner control unit
C
= Gas
solenoid valves
PZ = Internal pressure sensor of the TC for the
comparison of inlet pressure p
u
and
interspace pressure p
z
V
P
= Test volume
TC
2
TC 2
PZ
p
u
2
V1
V2
p
u
p
Z
V
P
L1(+
) N(-
) PE
OK
GFA
1 2 3
B
1 3 5 6
A
TC 2
1 2 3
C
V1
V
2