Siemens LMV37.4 Series Basic Documentation page 7

Building Technologies
HVAC Products
Fuel valve control program ................................................................... 59
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Light oil direct ignition, multistage........................................................ 60
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(Operating mode 5, 17)......................................................................... 60
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(Operating mode 5, 17)......................................................................... 60
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(Operating mode 6, 18)......................................................................... 60
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Light oil direct ignition, modulating....................................................... 61
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(Operating mode 4, 22)......................................................................... 61
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(Operating mode 4, 22)......................................................................... 61
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Fuel valve control program ................................................................... 61
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Light oil direct ignition modulating with 2 fuel valves.......................... 62
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(Operating mode 12)............................................................................. 62
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(Operating mode 12)............................................................................. 62
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Fuel valve control program ................................................................... 62
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6.7 Sequence diagrams ........................................................................................... 63
6.7.1 Gas direct ignition «G mod», «G mod pneu» .................................................. 64
6.7.2 Gas pilot ignition 1 «Gp1 mod», «Gp1 mod pneu» ......................................... 65
6.7.3 Gas pilot ignition 2 «Gp2 mod», «Gp2 mod pneu» ......................................... 66
6.7.4 Light oil direct ignition «Lo mod», «Lo 2-stage», «Lo 3-stage»...................... 67
6.7.5 Legend to the sequence diagrams ................................................................... 68
7 Selection of operating mode.......................................................................... 69
8 Connection to load controllers...................................................................... 71
8.1 Controller on contact X5-03, terminal 1............................................................ 71
8.2 External load controller via contacts X5-03, terminal 2 / terminal 3 ............... 71
8.3 Load controller via building automation X92.................................................... 74
8.4 Manual output..................................................................................................... 75
8.5 Output with curve settings ................................................................................. 75
8.6 External load controller via analog input X64.1 / X64.2 .................................. 76
Switching thresholds / minimum positioning step................................... 76
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8.6.1 Thresholds for modulating operation ................................................................ 76
8.6.2 Switching thresholds for 2-stage operation...................................................... 76
8.7 Prioritization of power sources.......................................................................... 77
8.7.1 Emergency operation with several load controllers......................................... 77
8.7.2 Manual control.................................................................................................... 77
9 Electronic air-fuel ratio control ..................................................................... 78
9.1 General ............................................................................................................... 78
9.2 Behavior outside operation................................................................................ 78
9.2.1 Running speed ................................................................................................... 78
9.2.2 No-load position ................................................................................................. 78
9.2.3 Prepurging .......................................................................................................... 79
9.2.4 Ignition................................................................................................................. 79
9.2.5 Postpurging......................................................................................................... 79
9.3 Modulating operation ......................................................................................... 80
9.3.1 Definition of curves ............................................................................................ 80
9.3.2 Running speed / maximum curve slope ........................................................... 81
9.3.3 Entering the running position ............................................................................ 81
9.3.4 Running position ................................................................................................ 81
9.3.5 Restriction of modulation range ........................................................................ 82
Basic Documentation LMV37.4...
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CC1P7546en
01.12.2009