BCU 370 · Edition 01.19 24
Function
If there is no pilot burner, program
steps
06
and
07
will be omitted.
As soon as the start-up signal (ϑ) is
switched off, post-purge starts. The
butterfly valve moves to the Igni-
tion position during this time, then
to the Closed position. Next, the
BCU rests in the start-up position/
standby.
NOTE: Quick start is not allowed for
units with FM or CSA approval.
06
07
08
00
A0
H8
08
P9
04
03
02
Start-up with ϑ signal
Fan run up time t
GV
(P20)
Waiting time t
W
Switch-on delay time t
E
running (P22)
Start-up position/standby
Start-up position/standby
Controlled shut-down
via ϑ signal
Flame proving period t
FS1
running for burner/pilot burner (P13)
Butterfly valve moves to Open position
Butterfly valve moves to Closed position
Flame proving period t
FS2
running for main burner (P15)
Safety time t
SA2
running for main burner (P14),
V3 opens
Butterfly valve moves to Ignition position
Controller enabler signal delay time t
RF
(P29)
Controller enable signal
Post-purge time t
PN
running (P19)
If parameter P27 = 0:
V2 is switched off
Safety time t
SA1
running
for burner/pilot burner (P12),
V1 and V2 open
Pre-ignition time t
VZ
running (P21)
Ignition activated
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