Compound regulator
Pressure switch, low
Air dampers
Pressure switch, high
Butterfly valve
Gauging position switch
Oil pump
Pressure indicator
Oil pressure regulator
Motor
Fan
Flame arrester
Ball valve
Pneumatic shut-off valve
Solenoid valve
Safety valve
One way valve
Pressure regulator
Adjustable valve
Mesh
Valve open softener
Orifice
5.3 Legend to time sequence diagrams
Phases:
00 Lockout phase
50 2nd safety time
01 Safety phase
52 Interval 2 (ti2)
10 Homerun
54 Low-fire position
12 Standby (stationary)
60 Operation 1 (stationary)
21 Shutoff valve ON (start release)
62 Operation 2
Low-fire position
22 Fan motor ON
70 Post-combustion time
24 Pre-purge position
72 Post-purge position
30 Pre-purge time (tv1)
74 Post-purge time (tn1)
32 Pre-purge time (tv)
76 Flue gas recirculation post-purge position
34 Pre-purge time (tv2) (flue gas recirculation
ARF)
78 Post-purge time (tn3)
36 Ignition position
79 Direct start
38 Pre-ignition (Z) ON
80 Valve proving evacuating time
40 Burner valve ON
81 Valve proving time atmospheric pressure
42 Ignition OFF
82 Valve proving filling time
44 Interval 1 (ti1)
83 Valve proving time gas pressure
78 (102)
M4263 2206EN