Honeywell Krom Schroder BCU 580 Technical Information page 88

Parameters
Parameter 48 = 3: controller enable following operating
signal or in standby.
This parameter is used to activate modulating capacity
control on BCU..F1 and F2. The controller enable signal
is issued via the output at terminal 56 in the start-up
position (standby) and during operation.
00 02 03
t
t
Z
FS1
t
SA1
The air actuator can be opened in standby via the input
at terminal 2 for this purpose. Cooling is then only pos-
sible in the start-up position/standby. The controller
enable signal is suspended during cooling.
00 A0 00 A0 00 02
t
Z
t
SA1
BCU 580 · Edition 11.15l
04 06 07 08
88
11
46
1
ϑ1
4
ϑ2
9
5
1
8
2
13
V1
14
V2
14
V3
57
V4
56
mA
17-18
37-38
t
t
SA2
FS2
03 04 06 07 08
56
2
53
17-18
t
t t
SA2
FS1 FS2
Parameter 48 = 4: opens with V4 pilot burner.
00 A0 00
The air valve opens with the start-up fuel rate. The air
valve can be activated externally via the input at ter-
minal 2 for cooling the burner in the start-up position/
t
standby.
▼
88
mA
A
M
t
A0 00 A2 A3 A4 A6
t t
t
Z
SA2
FS1
t
SA1
A7 A8
88
11
46
1
ϑ1
4
ϑ2
9
5
1
8
2
13
V1
14
V2
14
V3
57
V4
2
A
M
10 ∨ 53
17-18
37-38
t
t
FS2
88