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

BCU 370 · Edition 01.19 6
VG
IC 20
BVA
GIK
L1
V1
4
DG
min
9 3
VG..L
V2
5293130 32
23
21
24
13
17
18
19
20
26
28
25
BCU 370..I1
DL
DL
7
DG
M
22
UVS
90° ➔ 0 0 ➔ 90°
VG
IC 20
B VA
GIK
L1
V1
4
DG
min
9 3
VG..L
V2
5 32
23
21
24
13
17
18
19
20
25
BCU 370..I1..D3
DL
DL
7
DG
M
22
DG
11
DG
p
u
/2
UVS
29 3130
26
28
90° ➔ 0 0 ➔ 90°
V1
4
VG..L
V2
5
DG
11
DG
p
u
/2
Application
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
u
/2.
Parameter 27 = 1: V2 is “ON” during
burner operation.