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Building Technologies Division Basic documentation LMV36... CC1P7544en
Infrastructure & Citiies Sector 7 Basic unit 25.09.2013
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
236
Gas: Pressure switch-min input
0 = inactive
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))
237
Gas: Pressure switch-max / POC input
0 = inactive
1 = pressure switch-max
2 = POC
3 = pressure switch valve proving
241
Gas: Execution valve proving
0 = no valve proving
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
336
Fuel 1 gas: Pressure switch-min input
0 = inactive
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))
337
Gas: Pressure switch-max / POC input
0 = inactive
1 = pressure switch-max
2 = POC
3 = pressure switch valve proving
341
Fuel 1 gas: Execution valve proving
0 = no valve proving
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.
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