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Siemens Building Technologies Basic Documentation LMV5... CC1P7550en
HVAC Products 4 Burner control 13.08.2004
The input is used for connecting the start signal, e.g. from the release contact of an ex-
ternal outside air damper.
The input is only active when firing on gas and in programs LOgp and HOgp until the
end of TSA2.
The signal is anticipated in Phase 21.
Loss of the start signal causes the burner to shut down.
The input can be deactivated.
Parameter LMV52...: StartReleaseGas (activated / deactivated / CPI Gas / CPI
Gas+Oil / CPI Oil)
With the LMV52..., input «Start release gas» can alternatively be used as a CPI input.
In that case, it offers the same functionality as the original CPI input. This is needed on
applications that demand gas valve proving and CPI. If a «Start release gas» signal is
required, it must be delivered via input «Pressure switch-min-gas» (same as with the
LMV51...).
The input is used for connecting the gas pressure switch-max. It is only active when fir-
ing on gas.
The signal is anticipated when «TSA1» starts.
If the gas pressure is exceeded, safety shutdown will occur in any case.
The input can be deactivated.
Parameter: GasPressureMax (activated / deactivated)
There is a delayed reaction to loss of gas pressure during «TSA1» and «TSA2» to pre-
vent shutdown caused by pressure shocks when the valves open.
Parameter: PressReacTme
The input is used for connecting an oil pressure switch-min. It is only active when firing
on oil.
a) Parameter: OilPressureMin (activated)
It is anticipated that the pressure signal appears during preignition to be critically valued
(with HOgp in Phase 44). If there is no oil pressure, or if the oil pressure drops, safety
shutdown will occur in any case. The signal will be valued from TSA1. If there is no oil
pressure, safety shutdown will occur in any case.
b) Parameter: OilPressureMin (act from ts)
During preignition, there is no waiting for the oil pressure. The signal will be
valued from TSA1. If there is no oil pressure, safety shutdown will occur in
any case.
Note: This kind of parameterization is only permitted in case of individual system
approvals.
c) Parameter: OilPressureMin (deactivated)
The input can be deactivated.
There is a delayed reaction to loss of oil pressure during TSA1 and TSA2 to prevent
shutdown caused by pressure shocks when the valves open.
Parameter: PressReacTme
Start release gas
X7–03
(only with LMV52...)
Pressure switch-max-gas,
(PSmax-gas)
X9–03
Pressure switch-min-oil
(PSmin-oil)
X5–01
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