Siemens LMV37.400A2 - Gas Direct Ignition Sequence

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Building Technologies Basic documentation LMV37.4... CC1P7546en
HVAC Products 6 Basic unit 01.12.2009
6.7.1 Gas direct ignition «G mod», «G mod pneu»
Preignition Ignition (Z) = ON Interval 1 t44 Operation 1 (stationary) Atmospheric test Pr ess ure test Postpurge time t8
OUTPUTS INPUTS
Fan motor (M)
Fuel
Air
Actuators
0°
0°
t1
p
P
P
P
Control thermostat or pressurestat (R) ON
Air pressure s witch (LP)
Pressure switch - valve proving (P LT)
Ignition transformer (Z)
Alarm (AL)
POC (alter nativ to pr ess ur e switch-max (Pmax)
Fuel valve 1 (V1)
Fuel valve 2 (V2)
0°
Te st pressure switch-min (Pmin) Postpurge time t3
Fan motor (M) = ON Safety valve (SV) = ON Air damper (LK) => Fuel valv e (V ) - P OS
Air damper (LK) => Ignition (Z) - POS Operation 2 air damper (LK) => Low-fire (KL) - POS
Air damper (LK) => High-fire (NL) - POS
5 s
P
Required position
30 s
Required position
Required position
Figure 29: Program for gas direct ignition (G)