Valve Proving - Siemens LMV36.520A1 Basic Documentation

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7.5.2 Valve proving

Valve proving is active only when firing on gas. Valve proving designed to detect leaking
gas valves and, if necessary, to prevent the valves from opening or ignition from being
switched on. Lockout is initiated, if required.
When making the valve proving test, the gas valve on the burner side is opened first to
bring the test space to atmospheric pressure. When the valve is closed, the pressure in
the test space is not allowed to exceed a certain level. Then, the test space is
pressurized by opening the gas valve on the mains side. After closing, the gas pressure
must not fall below a certain level. Type of valve proving can be selected via parameter
236 / 336.
Valve proving can be parameterized to take place on startup, shutdown, or both.
Recommendation: Perform valve proving on shutdown.
No. Parameter
Gas: Pressure switch-min input
0 = inactive
236 1 = pressure switch-min (upstream of fuel valve 1 (V1))
2 = valve proving via pressure switch-min (between fuel valve 1 (V1) and fuel
valve 2 (V2))
Gas: Pressure switch-max / POC input
0 = inactive
237 1 = pressure switch-max
2 = POC
3 = pressure switch valve proving
Gas: Execution valve proving
0 = no valve proving
241 1 = valve proving on startup
2 = valve proving on shutdown
3 = valve proving on startup and shutdown
242 Gas: Valve proving evacuation time
243 Gas: Valve proving time test atmospheric pressure
244 Gas: Valve proving filling time
245 Gas: Valve proving time test gas pressure
Fuel 1 gas: Pressure switch-min input
0 = inactive
336 1 = pressure switch-min (upstream of fuel valve 1 (V1))
2 = valve proving via pressure switch-min (between fuel valve 1 (V1) and fuel
valve 2 (V2))
Gas: Pressure switch-max / POC input
0 = inactive
337 1 = pressure switch-max
2 = POC
3 = pressure switch valve proving
Fuel 1 gas: Execution valve proving
0 = no valve proving
341 1 = valve proving on startup
2 = valve proving on shutdown
3 = valve proving on startup and shutdown
342 Fuel 1 gas: Valve proving evacuation time
343 Fuel 1 gas: Valve proving time test atmospheric pressure
344 Fuel 1 gas: Valve proving filling time
345 Fuel 1 gas: Valve proving time test gas pressure
Caution!
If valve proving is parameterized to take place on startup and shutdown, the gas
valves must run through additional switching cycles. As a result, strain on the
gas valves (wear) increases.
Basic documentation LMV36...
7 Basic unit
CC1P7544en
25.09.2013