Siemens LMV51 Series Basic Documentation page 6

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Siemens Building Technologies
HVAC Products
Output «Start signal» or «PS valve» (APS test valve) type No-SI
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(START) X4-03.....................................................................................32
3.2 Program sequence.........................................................................................33
3.2.1 Parameters ....................................................................................................33
Time parameters ...................................................................................33
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3.2.2 Gas valve proving ..........................................................................................33
Determination of VP leakage rate......................................................34
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3.2.3 Special functions during the program sequence............................................35
Lockout phase (Phase 00) ....................................................................35
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Safety phase (Phase 01).......................................................................35
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Reset / manual lockout..........................................................................35
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Signaling start preventions....................................................................36
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Forced intermittent operation ................................................................36
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Program stop function ...........................................................................36
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Gas shortage program ..........................................................................37
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Part load shutdown ...............................................................................37
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Normal / direct start...............................................................................37
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Continuous fan operation ......................................................................38
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Response to extraneous light in standby ..............................................38
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3.2.4 Selection of fuel .............................................................................................38
Selection of fuel with the fuel selector on the LMV51... ........................38
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Selection of fuel on the AZL51... ...........................................................38
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Selection of fuel via bus ........................................................................38
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Fuel changeover ...................................................................................38
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3.2.5 Sequence diagrams .......................................................................................39
Direct gas ignition..................................................................................39
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Gas pilot ignition 1.................................................................................40
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Gas pilot ignition 2.................................................................................41
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Light oil direct ignition............................................................................42
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Heavy oil direct ignition .........................................................................43
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Light oil with gas pilot ignition................................................................44
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Heavy oil with gas pilot ignition .............................................................45
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Legend to the sequence diagrams........................................................46
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4 Fuel / air ratio control (FARC).....................................................................47
4.1 General ..........................................................................................................47
4.1.1 Program sequence.........................................................................................47
Standby .................................................................................................47
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Preventilation ........................................................................................47
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Ignition...................................................................................................47
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Traveling to the operating position ........................................................48
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Operation ..............................................................................................48
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End of operating position ......................................................................48
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Postpurging ...........................................................................................48
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Actuator speed outside normal operation .............................................48
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Operating position .................................................................................49
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Modulating .........................................................................................49
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Multistage operation ..........................................................................49
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4.1.2 Position check................................................................................................51
Dynamic safety time ratio control ..........................................................51
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Outside the operating position ..............................................................53
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Operating position modulating ..............................................................53
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Basic Documentation LMV51...
Contents
CC1P7550en
29.05.2002