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Chapter 4. Explanation of Operation
z Operation when there is a false flame before start input (
Non-recycling oil-fired combustion (2-level
combustion)
)
Input AUR890 operation Sequence
codes
Operation of external devices
Power ON When approximately 8 seconds have passed after the power has been
turned on, the 7-segment LED display on the front panel of the AUR890
shows the sequence code [- -].
Because there was a false ame signal, the FLAME LED (green) on the
front panel of the AUR890 lights up.
- -
Burner
operation
switch ON
- - When the burner operation switch is turned
on, the blower starts to operate, and if the
limit and interlock conditions are normal, a
prepurge is done. After the prepurge, the
prepurge completion signal is turned ON.
Blower: operating
Controller
ON
If there is a false ame signal before the controller turns ON, after the
prepurge completion signal and then the controller turn ON, a false
ame check is executed during the start check.
P 1
If a false ame signal lasts for 15 seconds or longer, the AUR890 will be
locked out, and relay K6 and the alarm output turn ON.
Also, the ALARM LED (red) on the front panel of the AUR890 lights up.
P 1 / E 1
Alarm output : ON
––
P1
––
Stop
Start check
Lockout
P1/E1
AUR890
Prepurge time
(external circuit)
15 s
Approximately 8 s
Blower
Fuel oil valve
Two-level fuel oil valve
[Input]
Power supply
[7-segment display]
[Output]
Ignition transformer
Burner operation switch
Controller
Flame signal
RESET switch
[LED]
FLAME LED (Green)
Alarm output
ALARM LED (Red)
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