PFU 780 · Edition 02.12
6
VR..L
VAG
SPS
PLC
CPE
DI
L1, N, PE
P
2
1
t
1
2
ϑ
1
ϑ
2
A
P
DI
UV
02–04
02–04 06–08
06–08
VBY
PFU 780
10e
2c
4c
18a
26e
10c
22e
22a
28c
16c
18e
6a
6e
2e
4e
14a
30e
10a
TZI
2
1
ϑ
1
ϑ
2
µC
1 .1 Examples of application
1 .1 .1 Stage-controlled main burner with
alternating pilot burner
Control: Main burner ON/OFF.
The main burner can be started with
reduced capacity after the operating
signal from the pilot burner has been
detected. The pilot burner is switched
off automatically after the main burner
has started up. When the main burner is
switched off, the pilot burner automati-
cally 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.
Application