Siemens LMV37.400A2 - Light Oil Direct Ignition Sequences

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Building Technologies Basic documentation LMV37.4... CC1P7546en
HVAC Products 6 Basic unit 01.12.2009
6.7.4 Light oil direct ignition «Lo mod», «Lo 2-stage», «Lo 3-
stage»
0°
0°
t1
p
P
P
0°
5 s
Preignitio n Ignition ( Z) = ON Interval 1 t44 Operation 1 (stationary) Postpurge time t8
OUTPUTS
INPUTS
Fan motor (M)
Fuel
Air
Actuators
Control thermostat or pressurestat (R) ON
Air pressure switch (LP)
Ignition transformer (Z)
Alarm (AL)
POC ( alter nativ to pr essure switch- max (Pmax)
Fu el valve 1 (V1)
Fu el valve 2 ( V2)
Postpurge time t3
Fan motor (M) = ON Safety valve (SV) = ON Air damper (LK) => Fuel valve (V) - POS
Air damper (LK) => Ignition (Z) - POS Operation 2 air damper (LK) => Low -fire ( KL) - POS
Air damper (LK) => High-fire (NL) - POS
Required position
Required position
Required position
Figure 32: Program for light oil (LO)