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Building Technologies Basic Documentation LMV27... CC1P7541en
7 Basic unit LMV27 17.12.2018
If there is no gas pressure, at least safety shutdown is initiated.
Error
code
Diagnostic
code
Meaning for the LMV27
20 0
Pressure switch-min
No minimum gas / oil pressure
20 1 Gas shortage start prevention
23 0
Pressure switch-min
No minimum gas / oil 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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