Siemens LMV37.400A2 - Fuel Trains and Sequence Diagrams; Fuel Train Application Examples

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Building Technologies Basic documentation LMV37.4... CC1P7546en
HVAC Products 6 Basic unit 01.12.2009
6.6 Fuel trains (application examples)
SV
V1
V2
Direct ignition
G
Program
7546 s01e/ 0208
SA
P
max
P
min
P
LT
SV
V1
SA
V2
Program
Gp1
Gas pilot
7546s02e/0208
PV
P
min
sP
LT
P
max
SV
´P
max
SA
V2
Program
Gp2
Gas pilot
7546 s03e/020 8
P
min
PV
V1
P
LT
Gas (always modulate)
Direct trafo ignition
G
PV V1 V2
TSA1
TSA2
Operation
*)
Pilot ignition 1
Gp1
PV V1 V2
Pilot ignition 2
Gp2
PV V1 V2
7546f01e/0307
Legend for fuel trains:
*) Not used
1) Series connection of two DC 115 V
valves (each requiring approx. 25 VA
control power)
LO Light oil
No Normally Open
P LT Valve proving
Pmax Pressure switch-max
Pmin Pressure switch-min
PV Pilot valve
SA Actuator
SV Safety valve
(outside the building)
TSA... Safety time
V Fuel valve
Gas direct ignition
(Operating mode 1, 7, 14, 19)
Gas pilot ignition 1
(Operating mode 2, 8, 15, 20)
Gas pilot ignition 2
(Operating mode 3, 9, 16, 21)
Fuel valve control program