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Chapter 4. Explanation of Operation
z Normal operation (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 [- -].
- -
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 the prepurge completion signal is ON and the controller is ON, the
internal circuits are checked during the start check.
P 1
Afterward a false ame check is conducted during the ignition wait
time.
P3
If the status is normal, the safety lockout time begins, relays K1, K2, K3
and K5 turn ON, the ignition transformer starts, and the fuel oil valve
opens.
P4
Ignition transformer : start
Fuel oil valve : open
After the lockout time has passed, if a ame signal is detected, the
ignition transformer output is maintained until the standby time for
normal combustion has passed.
P5
Ignition transformer : continues operation
Fuel oil valve : remains open
When the ame detector detects the ame from the fuel oil valve fuel,
relay K5 turns OFF, the ignition transformer stops, relay K4 turns ON, the
two-level fuel oil valve opens, and normal combustion begins.
The FLAME LED (green) on the front panel of the AUR890 lights up.
P8
Ignition transformer : stop
Two-level fuel oil valve : open
Burner
operation
switch OFF
When the burner operation switch is turned OFF, relays K1, K2, K3 and
K4 turn OFF, and the fuel oil valve and two-level fuel oil valve close.
The FLAME LED (green) on the front panel of the AUR890 turns o.
- - Fuel oil valve : closed
Two-level fuel oil valve : closed
Blower : stop
Power OFF When the power is turned OFF, the 7-segment LED display on the front
panel of the AUR890 stops showing the sequence code [- -].
––
P1
–– ––
Stop
Start check
P3
Ignition standby
P4
Lockout timing
P8
Main burner combustion standby
P5
RUN
Stop
Fuel oil valve
AUR890
Two-level fuel oil valve
Prepurge time
(external circuit)
Start check + Ignition standby time
Approximately 3 s
Approximately 8 s
Lockout timing time
Main burner combustion standby time
[Input]
Power supply
[7-segment display]
Limit, Interlock
[Output]
Ignition transformer
Burner operation switch
Blower
Controller
Flame signal
RESET switch
[LED]
FLAME LED (Green)
Alarm output
ALARM LED (Red)
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