Honeywell BCU 460 User Manual

BCU 460, BCU 465 · Edition 11.19 83
Parameters
11.5.3 Safety time 1 t
SA1
Parameter A094
During safety time 1 t
SA1
, the flame (pilot flame) is ig-
nited. It can be set to between 2 and 15s.
t
SA1
t
Z
8802 03
ϑ
t
L1
V1
V2
V3
00
04
t
FS1
1
35
L
51
22
60
61
62
96
82
Safety time 1 starts with the application of the ϑ sig-
nal (terminal1). The valves open at the start of safety
time1. The fuel supply to burner1 is released so that
a flame can form. If no flame is detected at the end of
safety time1, the valves are closed again. Depending
on parameterA007 (Burner1 start-up attempts), the
BCU reacts either with an immediate safety shut-down
with fault lock-out (A007=1) or with one or two ad-
ditional start-up attempts (A007= 2 or3). The BCU will
complete a maximum of three start-up attempts.
Safety time1 must be determined on the basis of cur-
rent national standards and regulations. The burner
application and the burner capacity are the main cri-
teria for this.
If the ϑ signal (terminal1) drops out during safety
time1, the valves will not be switched off until the end
of safety time1.
11.5.4 Flame proving period 1 t
FS1
Parameter A095
Flame proving period 1 (t
FS1
) can be parameterized
to enable the flame on burner1 to stabilize after the
elapse of safety time1. Only when the flame proving
period has elapsed will the next program steps be initi-
ated by the BCU. The flame proving period can be set to
between 0 and 25s.
t
SA1
t
Z
8802 03
ϑ
t
L1
V1
V2
V3
00
04
t
FS1
1
35
L
51
22
60
61
62
96
82

Honeywell BCU 460 Specifications

General

Brand	Honeywell
Model	BCU 460
Category	Control Unit
Language	English