Riello 20155654, Installation, Use And Maintenance Instructions

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17 20155699 GB
Technical description of the burner
4.13 Burner operating sequence
Key to layout (Fig. 8)
Tab. H
Key to layout (Fig. 8)
FGR
FGR release
X01 Gas valve 1
X02 Gas valve 2
X03 Pilot valve
X04 Ignition transformer
X05 Gas pressure > min.
X06 Gas safety circuit
X07 Boiler safety circuit
X08 Air pressure switch
X10 Burner ON
X20+X21 Flame signal
X24
Fault
X25 Fan ON
X32 Air servomotor
X33 Fuel servomotor
X34 FGR servomotor
Fig. 8
X07
X06
X10
X05
X08
X20+X21
FGR
X32
X33
X34
X04
X03
X01
X02
X25
X24
S9612
Any condition
t1 Waiting time for safety circuits consent
(boiler fuel)
t2 Opening time of the gas valve (with
sealing control active) 2.4 s
t3 Servomotor opening time 30/60 s
t4 Activation time FGR servomotor 0 - t5
t5 Pre-purge time adjustable
t6 Pre-ignition time adjustable
t7 Ignition flame safety time 3 s
t8 Flame stabilization time adjustable
t9’ Safety time 2
nd
stage 3 s
t10 Modulation phase
t11 Adjustment time
t12 Opening time of the gas valve (with
sealing control active) 3 s
t13 Post-purge time adjustable
t15 Post-combustion time adjustable
t16 Checking time for flame extinction 5 s
t17 Checking time for gas valve (with seal-
ing control active) 30 s