Pre-Ventilation Time After Safety Shut-Down; Pre-Ventilation For Restart/Start-Up Attempts; Pre-Ventilation After Reset (Bcu 465 - Honeywell BCU 460 Technical Information

Parameters

4 . 7 .6 Pre-ventilation time after safety shut-down

(BCU 465 . .L)
Parameter 39
Value range 0 – 250 s
This can be set in 1 s steps.
This determines the time for which pre-purge is to occur
after a safety shut-down.
A1 01 A1
t t
VL BP
With this function, the combustion chamber can be
purged after a safety shut-down in compliance with
standards, especially on radiant tube burners. This task
is not implemented by a central control system but by
the BCU 465. See also parameters 40 and 41.
BCU 460, BCU 465 · Edition 03.16l
A2 A4 88
1
5
4
ϑ
7
9
12
14
23
26
21
16-17
18-19
t t
VL Z
t
SA

4 . 7 . 7 Pre-ventilation for restart/start-up attempts

(BCU 465 . .L)
Parameter 40
This parameter determines whether the pre-ventilation
time (parameter 39) is to run after a restart or after the
start-up attempts.
Parameter 40 = 0: The pre-ventilation time is deacti-
vated on restart and in the case of several start-up at-
tempts.
Parameter 40 = 1: The pre-ventilation time is activated
in the case of restart and several start-up attempts.
V1
V2
4 . 7 .8 Pre-ventilation after reset (BCU 465 . .L)
A
Parameter 41
This parameter determines whether the pre-ventilation
t
time (parameter 39) is to run in the case of a reset after
a fault lock-out.
Parameter 41 = 0: The pre-ventilation time is deacti-
vated after a reset.
Parameter 41 = 1: The pre-ventilation time is activated
after a reset with the start-up signal (ϑ).
64