Honeywell Krom Schroder PFU 780 Technical Information page 15

or fault lock-out
Function
07
Flame proving period
t running (P25)
FS2
In the event of flame failure:
restart or fault lock-out
08
Operating signal
Main burner closes
In the event of flame failure:
restart or fault lock-out
08
Normal shut-down
via ϑ signal for
pilot and main burners
00
If min. combustion time t
has elapsed:
Operation signalling contact
opens,
V1 and V2 close,
min. burner pause time t
starts to elapse (P21)
PFU 780 · Edition 02.12l
The air valve can be set to open
with V2 or to be activated ex-
ternally (display
eter 30.
The air valve can be set to open
with the operating signal or to
be activated externally (display
A8
) via parameter 30.
B
BP
Behaviour of the pilot burner in
the event of flame failure during
operation
If the flame fails during operation,
A7
) via param-
either an immediate fault lock-out
occurs or a restart occurs. This pro-
cedure can be set via the optical in-
terface (parameter 12, "Pilot burner
restart").
Behaviour of the main burner in
the event of flame failure during
start-up
If no flame is detected during the
safety time t
out occurs or up to three further
start-up attempts occur. (Param-
eter 11, "Main burner start-up at-
tempts").
Behaviour of the main burner in
the event of flame failure during
operation
If the flame fails during operation,
either an immediate fault lock-out
occurs or a restart occurs. This pro-
cedure can be set via the optical in-
terface (parameter 13, "Main burner
restart").
, either a fault lock-
SA2
15