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Building Technologies Basic documentation LMV37.4... CC1P7546en
7 Basic unit LMV37.4 17.12.2018
7.5.4.6. Gas shortage program
Valve proving via gas pressure switch-min (parameter 236 = 2)
As gas pressure switch-min is located between the valves, the gas shortage test cannot
be made in phase 22. Instead, when performing valve proving on startup, the gas
shortage test is performed at the end of the filling time (end of phase 82).
With no valve proving on startup, the gas shortage test is made directly before first
safety time is started (end of phase 39).
No. Parameter
236
Gas: Input pressure switch-min
2 = valve proving (between fuel valve V1 and fuel valve V2) via pressure
switch-min
Standard valve proving (parameter 236 = 1)
If the gas pressure is too low, startup is aborted in phase 22.
No. Parameter
236
Gas: Input pressure switch-min
1 = pressure switch-min before fuel valve V1 (default setting)
246 Gas: Gas shortage waiting time
If gas shortage occurs with the last of the parameterized number of start attempts, the
system initiates lockout.
No. Parameter
223
Repetition limit value gas pressure switch-min
1 = no repetition
2...15 = 1...14 number of repetitions
16 = constant repetition
Recharging time:
After the Operation phase
In that case, the LMV37.4 with gas shortage program makes a selectable number of
start attempts until lockout occurs. The waiting time from one start attempt to the next is
doubled each time, starting from an adjustable waiting time.
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