Sa1; Fs1 - Honeywell BCU 370 Technical Information

Parameters
4 .3 .5 1 st safety time on start-up, burner/pilot burner t
Parameter 12
00 H0 01 A1 P1 A2 03 04
t t t t
E GV PV VZ
The safety time on start-up t
pilot burner or burner valves will be closed in the event
of flame signal failure.
V1 and V2 are opened and the ignition unit is activated
as the safety time t

SA1

signal is pending after elapse of the safety time t
the BCU performs a safety shut-down. The valves are
closed. The BCU carries out up to 3 further start-up at-
tempts, depending on how parameter 07 "Burner start-
up attempts" has been set.
BCU 370 · Edition 01.19
05 06 07 H8 08
t t t t t
Z1

FS1

SA2 FS2 RF
t
SA1
determines when the
SA1
starts to elapse. If no flame
The setting of safety time t
SA1
the basis of the burner capacity, the type of control and
the relevant application standard, e.g. EN 746-2, EN
88
676, NFPA 85 or NFPA 86.
1
24
11 4 .3 .6 1 st flame proving period, burner/pilot burner t
DG
max.
9
DG
min.
30 Parameter 13
90° 0
29
0 90°
31
32
00 H0 01 A1
7
DL
21
ϑ
3
16
13
4
V1
5
V2
6
V3
17-18
19-20
t
t t
E GV
Determines the flame proving period of the burner or
,
pilot burner.
SA1
This time elapses before the BCU starts the next pro-
gram step so as to give the flame time to stabilize.
The flame proving period t
safety time t
is to be determined on
SA1
P1 A2 03 04 05 06
t t t t t
PV VZ Z1 FS1 SA2
t
SA1
starts to elapse once
FS1
has expired.
SA1
FS1
07 H8 08 88
1
24
11
DG
max.
9
DG
min.
30
90° 0
29
0 90°
31
32
7
DL
21
ϑ
3
16
13
4
V1
5
V2
6
V3
17-18
19-20
t
t t
FS2 RF
46