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Application
1 .1 .3 PFA 710 with PFU 780, stage-controlled main
burner with alternating pilot burner
L1, N, PE
DI
P
SPS
02–04 06–08
02–04
06–08
ϑ1
1
ϑ2
2
Control: main burner ON/OFF
The main burner can be started with reduced capac-
ity after the operating signal from the pilot burner has
been detected. The pilot burner is switched off auto-
matically after the main burner has started up. When
the main burner is switched off, the pilot burner auto-
matically switches on again.
A UV sensor monitors the flame signal from pilot and
main burners. UV sensor UVD 1 is used for continuous
operation, UV sensor UVS for intermittent operation.
PFA, BGT · Edition 03.11l
BUS
TZI
VBY
t
1
2
VAG
VR..L
1 .1 .4 PFA 710 with PFU 780, stage-controlled main
burner with permanent pilot burner
L1, N, PE
DI
P
SPS
02–04 06–08
04
06–08
04
ϑ1
1
ϑ2
2
Control: main burner ON/OFF
The main burner can be started with reduced capac-
ity after the operating signal from the pilot burner has
been detected. Pilot and main burners can be operated
simultaneously. Both are ionization-controlled inde-
pendently.
Control: main burner High/Low
The main burner starts at low-fire rate. When the oper-
ating state is reached, the PFU 780L advises the con-
trol unit. The PLC can now pulse the air valve in order to
control the capacity of the main burner.
BUS
TZI
VBY
t
1
2
VAG
VR..R
6
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