BCU 460, BCU 465 · Edition 11.19
79
Parameters
11 .5 .2 Burner application
Parameter A078
This parameter enables the BCU to be adjusted to vari-
ous burner applications. In addition, an optional pilot
gas valve (V3) can be parameterized via which the
burner is started with a defined ignition capacity.
Parameter A078 = 0: burner 1. Two valves (V1, V2) are
included for the burner. These are connected to the
valve outputs (terminals 60 and 61). Valves V1 and V2
are opened in parallel to start the burner in order to re-
lease the gas supply to the burner.
BCU 46x
µC
V1
V2
61 62
60
52
55
54
53
56
47 48
58
03
02
01
04
2
1
3
51
61
62
60
22
96
t
t
FS1
t
SA1
t
BP
1
Parameter A078 = 1: burner 1 with pilot gas. Three
valves (V1, V2 and V3) are included for a burner with a
pilot gas valve. These are connected to the valve out-
puts (terminals 60, 61 and 62). Valves V1 and V3 open
to start the burner. The burner is started with a limited
ignition capacity using gas valve V3. After the elapse of
the safety time t
SA1
(program step 02), valve V2 opens.
Valve V3 limits the ignition capacity. After the elapse
of the flame proving period t
FS1
(program step 04), it is
closed again.
For this application, it must be ensured that the flame
proving period (parameter A095) is set to a value ≥ 2 s.
BCU 46x
µC
V1
V2
V3
61 62
60
52
55
54
53
56
47 48
58
03
02
01
04
2
1
3
51
61
62
60
22
96
t
t
FS1
t
SA1
t
BP
1
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