Applications Example; Modulating-Controlled Forced Draught Burner; Tightness Control - Honeywell BCU 370 Technical Information

Application
BCU 370..I1
L1
21
24
23
22
9 3 7
DG DL
min
DG
VG
BCU 370..I1..D3
L1
21
24
23
22
9 3 7
DG DL
min
DG
VG
BCU 370 · Edition 01.19
4 5 29 30
V1 V2
VG..L
M
IC 20
DL
B VA
4 4 11 11 5 5 29 30
V1 V1 DG DG V2 V2
DG DG
VG..L VG..L
p p /2 /2
u u
M
IC 20
DL
B VA
25
28
26
20
19
18
17
31 32 13
GIK
25
28
26
20
19
18
17
31 32 13
GIK

1 .1 Applications example

1 .1 .1 Modulating-controlled forced
draught burner
The BCU 370 controls the fan and
moves the butterfly valve to pre-
purge and ignition position. It issues
the enable signal to the control sys-
tem after start-up of the burner.
1 .1 .2 Modulating-controlled forced
draught burner with tightness
control
In addition to controlling the forced
draught burner, the burner control
unit also monitors the fail-safe
function of the two solenoid valves
for gas via the gas pressure switch
DG which is set to p /2.
u
Parameter 27 = 1: V2 is "ON" during
burner operation.
6