17
T-Product · BCU 465 · 2006 April
External control of air valve
function
It is possible to externally activate
the air valve by applying voltage to
terminal #23. It is also possible to
activate the air valve with the burner
switched off for cooling.
During activation of the air valve, the
display shows an “A” and the current
program status.
If parameter 31 is set to “0”, the air
valve cannot be activated externally
on start-up (between start-up and
operation signal of the main burner).
Burners that are unable to start at
maximum airflow rate use this set-
ting.
If parameter 32 is set to “1”, the air
valve may be activated, even during
a fault. With setting “0”, -it remains
closed. It cannot be activated, how-
ever, when the automatic burner
control unit is deactivated. When
activated, the display indicates “A0”
(not flashing).
Operation
Air Valve Control of BCU 465
