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Building Technologies Basic documentation LMV37.4... CC1P7546en
7 Basic unit LMV37.4 17.12.2018
If the gas pressure fails, at least a shutdown will be initiated.
Error
code
Diagnostic
code
Meaning for the LMV37.4
20 0
Pressure switch-min
No minimum gas pressure
20 1 Gas shortage start prevention
23 0
Pressure switch-min
No minimum gas pressure
23 1 Gas shortage start prevention
For the input, a repetition counter can be parameterized. It can be used to set the
number of errors permitted until lockout occurs. The counter also impacts the gas
shortage program (refer to chapter Repetition counter).
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
Start release gas
If, at the same time, the input is used as a start release input (e.g. for an air supply
damper), it can be connected in series with the pressure switch.
When selecting Valve proving via pressure switch-min (parameter 236), function Start
release gas is not supported.
No. Parameter
236
Gas: Input pressure switch-min
1 = pressure switch-min before fuel valve V1 (default setting)
2 = valve proving (between fuel valve V1 and fuel valve V2) via pressure
switch-min
3 = pressure switch-min after fuel valve V2
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