BCU 370 · Edition 01.19 22
Function
After controlled shut-down, the
post-purge time t
PN
starts to elapse
and then the butterfly valve moves
to the Ignition position in prepara-
tion for the next start.
NOTE: Quick start is not allowed for
units with FM or CSA approval.
07
08
00
H8
08
P9
A1
A2
04
03
Start-up with ϑ signal
Waiting time t
W
Fan run up time t
GV
(P20)
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)
Flame proving period t
FS2
running for main burner (P15)
Safety time t
SA2
running for main burner (P14),
V3 opens
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
Butterfly valve moves to Open position
Butterfly valve moves to Ignition position
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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