Behaviour During Operation; Safety Time During Operation T; Burners . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 Sb For Pilot And Main; Fault Lock-Out Or Restart, Pilot Burner - Honeywell Krom Schroder PFU 780 Technical Information

Parameters

4 .6 Behaviour during operation

4 .6 .1 Safety time during operation t

burners
Parameter 14
This indicates the safety time during operation t
for valves V1 and V2. The default in accordance with
EN 298 is 1 s. The PFU has also the available option of
a safety time during operation t
time increases the installation availability in the case
of brief-duration signal fades (e.g. fades of the flame
signal). In accordance with EN 746-2, the safety time
of the installation during operation (including closing
time of the valves) may not exceed 3 seconds (note the
requirements of the Standards).

4 .6 .2 Fault lock-out or restart, pilot burner

Parameter 12
This parameter determines whether the PFU starts a
one-off restart or performs an immediate fault lock-out
for the burner after an installation fault such as a flame
failure or failure of air flow (see also Project planning
information).
PFU 780 · Edition 02.12l
for pilot and main
SB
SB
of 2 s. Prolonging the
SB
Immediate fault lock-out following flame failure
Parameter 12 = 0:
Pilot burner fault lock-out.
04 04
t
SB
After a fault lock-out, the burner control unit can be
reset, either with the button on the front panel or using
an external button. Several burner control units can be
reset in parallel using the external button.
The PFU cannot be reset by mains failure. The fault
signalling contact does, however, open as soon as the
mains voltage fails.
See also parameter 32, Behaviour of the air valve in the
event of a fault lock-out.
▼
88
30a
26e
10e
1
28c
26a
1
16c
V1
18e
V2
2c–4c
1
2e–4e
t
35