Siemens LMV50 series

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Building Technologies Basic Documentation LMV5... CC1P7550en
4 Burner control 22.05.2018
4.1.5.9 Gas pressure switch-min (X9-03 pin 4)
The input is used for connecting the gas pressure switch-min.
The input is only active when firing on gas and in the LOgp and HOgp programs until
the end of second safety time. It can be deactivated for oil programs LOgp and HOgp.
The signal is anticipated in phase 21.
If there is no gas pressure, the ↑ gas shortage program is activated.
Loss of gas pressure / start signal causes the burner to shut down.
Β
Note!
If input X7-03 pin 2 (start release gas) is used as a valve closure contact, the start
release gas (e.g. from the contact of an external outside air damper) can be connected
in series to the gas pressure switch-min at this input (X9-03 pin 4).
Input X9-03 pin 4 can be parameterized as follows:
∂ Activate gas pressure-min
∂ Deactivate gas pressure-min for the oil fuel trains with gas pilot LOgp and HOgp
(xOgp)
∂ Activate gas pressure-min
Parameter
GasPressureMin (activated / deact x OGP / deactivated)
2)
2)
(activated / deactivated) Active inputs are checked for signal input.
There is a delayed reaction to loss of gas pressure during safety time to prevent
shutdown caused by pressure shocks when the valves open.
Parameter PressReacTme (0.2s..MaxSafetyTGas)