Fault Lock-Out Or Restart, Main Burner - Honeywell Krom Schroder PFU 780 Technical Information

Parameters

4 .6 .3 Fault lock-out or restart, main burner

This parameter determines whether the PFU starts a
one-off restart or performs an immediate fault lock-out
for the main burner after a flame failure (see also Pro-
ject planning information).
Immediate fault lock-out following flame failure
Parameter 13 = 0:
Main burner fault lock-out
08 08
t
SB
After a flame failure, the burner control unit performs
a fault lock-out within the safety time during operation
t . This involves disconnecting the power from the gas
SB
valves and the ignition transformer. The fault signalling
contact closes, the display blinks and shows the current
program status (see table "Program status and fault
messages").
PFU 780 · Edition 02.12l
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 "Behaviour of the air valve in the event of a
fault lock-out".
88
▼
30a
26e
10e
1
28c
16c
V1
26a
1
2c–4c
1
14a
2
18e
V2
18a
2
6a–6e
2
2e–4e
t
37