PFU 780 · Edition 02.12
28
4 .4 Behaviour in start-up position/standby
4 .4 .1 Flame simulation check in start-up position/standby
Parameter 15
This defines the instant for the flame simulation check.
t
LV
00
t
01
26a
16c
18e
2c–4c
88
10e
26e
30a
28c
2e–4e
V1
V2
ϑ
1
1
If the PFU notices an extraneous signal during the flame simu-
lation check, it starts the flame simulation delay time t
LV
(25 s).
If the extraneous signal is discontinued during this period,
the burner can start up. Otherwise, a fault lock-out occurs.
1
blinks on the display if an extraneous signal is detected
by the pilot burner and
5
blinks if an extraneous signal is
detected by the main burner.
Parameter 15 = 0: The flame simulation check is conducted
after applying the start-up signal (
ϑ
) during the waiting time t
W
.
Parameter 15 = 1: The flame simulation check is conducted
provided no start-up signal (
ϑ
) is applied (during the so-called
start-up position/standby). This allows fast start-up of the
burner since there is no waiting time t
W
.
The burner must have been switched off for at least 4 s before
start-up in order for the flame simulation check to be con-
ducted correctly.
Flame simulation check depending on parameter 16 (Pilot
burner operating mode):
Parameter 15 = 1, Parameter 16 = 1
t
ϑ
1
ϑ
2
88
00 02
06
V1
V2
Parameter 15 = 0, Parameter 16 = 1
t
ϑ
1
ϑ
2
88
00 01
05
V1
V2
02
06
t
W1
t
W2
Parameter 15 = 1, Parameter 16 = 0
t
ϑ
1
ϑ
2
88
00 02
06
V1
V2
Parameter 15 = 0, Parameter 16 = 0
t
W1
t
W2
t
ϑ
1
ϑ
2
88
00 01
05
V1
V2
02
06
Parameters