Glossary; Waiting Time T W; Safety Time On Start-Up T Sa; Ignition Time T Z - Honeywell krom schroder BCU 440 Manual

Glossary

11 Glossary
11 .1 Waiting time t
01 02
t
W
Once the start-up signal ϑ has been applied, the wait-
ing time t starts to elapse. During this time, a self-test
W
is conducted to detect errors in internal and external
circuit components. If no malfunction is detected, the
burner will start up.
11 .2 Safety time on start-up t
This refers to the period of time between switching on
and switching off of the pilot gas valve V1, when no
flame signal is detected. The safety time on start-up
t (3, 5 or 10 s) is the minimum operating time of the
SA
burner and burner control unit.
BCU 440 · Edition 01.17
W
02
88
1
ϑ
7
9
12
16-17
18-19
t
t
Z
t
SA
SA
11 .3 Ignition time t
If no malfunction is detected during the waiting time
t , the ignition time t
W Z
supplied to the pilot gas valve V1 and the ignition trans-
former and the burner is ignited. The duration of the
ignition time is either 2, 3 or 7 seconds, depending on
safety time t selected.
SA
11 .4 Flame simulation/Flame simulation delay
time t
LV
01
t
LV
An extraneous signal (flame simulation) is a flame sig-
nal that is detected, although there should be no flame
according to the program sequence. If such an extrane-
ous signal is detected, the flame simulation delay time
t starts to elapse. If the flame simulation is disconti-
LV
nued during the flame simulation delay time t
up can be initiated or operation continued. Otherwise, a
fault lock-out occurs.
Z
then starts to elapse. Voltage is
01
88
1 ϑ
7
9
12
V1
16-17
18-19
t
, start-
LV
34