Cooling In Start-Up Position/Standby; Air Valve Opens In The Case Of External Activation; (Not During Start-Up) - Honeywell BCU 460 Technical Information

Parameters

4 .6 .2 Cooling in start-up position/standby

The air valve can be activated externally by input 23 for
cooling in the start-up position. During activation of the
air valve, the display shows A0 , indicating that cooling
is currently being carried out.
Parameters 30 and 31 determine the behaviour of the
air valve during burner start.
4 .6 .3 Air valve opens in the case of external
activation (not during start-up)
00 A0 02
Parameter 30 = 0: The air valve opens if it is activated
externally by input 23.
Parameter 31 = 0: The air valve remains closed during
start-up even if it is activated externally.
These settings are required on burners on which the
gas/air ratio is controlled by a pneumatic air/gas ratio
control system link and which also need to be started at
low fire, e.g. on two-stage-controlled burners, see page
BCU 460, BCU 465 · Edition 03.16l
03 A4 88
1
5
4
ϑ
7
9
12
V1
14
V2
23
A
26
16-17
18-19
t
t
t
Z
FS
t
SA
8 (BCU 460..L: Two-stage-controlled burner). In
this case, activation of the air valve during burner start
via input 23 must be prevented.
External control allows switchover between low fire and
high fire during operation.
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