Gas Valve Proving - Siemens LMV50 Series Manual

Example
Mains
t80
Figure 30: Gas valve proving
Building Technologies

4.2.2 Gas valve proving

Gas valve proving is only active when firing on gas.
When a leak is detected, the gas valve proving function ensures that the gas valves are
not opened and that ignition is not switched on. Safety shutdown is initiated.
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t81 t82 t83
The valve proving function can be parameterized and the time selected:
∂
During startup (between phases 30 and 32)
∂
During shutdown (between phases 62 and 70)
∂
During startup and during shutdown
Basic Documentation LMV5...
4 Burner control
Step 1: t80 Evacuate the test space
With gas valve proving, first the gas valve on the burner
side is opened to bring the test space to atmospheric
pressure.
Step 2: t81 Atmospheric pressure test
After closing the gas valve, the pressure in the test space
is not allowed to rise above the switching point of pressure
switch-valve proving (e.g. gas pressure in operation x 0.5).
Step 3: t82 Fill test space
Then, the gas train is filled by opening the gas valve on the
gas network side.
Step 4: t83 Gas pressure test
After closing the gas valve, the gas pressure is not allowed
to fall below the switching point of pressure switch-valve
proving (e.g. gas pressure in operation x 0.5).
Input / output signal 1 (ON)
Input / output signal 0 (OFF)
Input, permissible signal 1 (ON) or 0 (OFF)
Pressure switch-valve proving
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Fuel valve
V...
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CC1P7550en
22.05.2018