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Chapter 4. Explanation of Operation
z Operation when a flame failure occurs (
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 turns ON,
the sequence that follows is start check, ignition standby, lockout time,
standby for normal combustion, and normal combustion.
The FLAME LED (green) on the front panel of the AUR890 lights up.
P8
Fuel oil valve : open
Two-level fuel oil valve : open
During normal combustion, if a ame failure of the burner occurs for
some reason, after the ame failure response time has passed, the
AUR890 will be locked out. At that time relays K1, K2, K3 and K4 turn
OFF, the fuel oil valve and two-level fuel oil valve close, relay K6 turns
ON, and the alarm output turns ON.
The FLAME LED (green) on the front panel of the AUR890 turns o, and
the ALARM LED (red) lights up.
P8 / E7
Fuel oil valve : closed
Two-level fuel oil valve : closed
Alarm output : ON
Burner
operation
switch OFF
P8 / E7
Blower : stop
Contact
reset or
main
unit reset
switch: ON
Relay K6 turns OFF to turn OFF the alarm output.
The ALARM LED (red) on the front panel of the AUR890 turns o.
- - Alarm output : OFF
––
P1
–– ––
Stop
Start check
P3
Ignition standby
P4
Lockout timing
P8 P8/E7 P8/E7
Main burner combustion standby
P5
Main burner combustion
Stop
Stop
Flame failure
Lockout
AUR890
Prepurge time
(external circuit)
Start check + Ignition standby time
Approximately 3 s
Approximately 8 s
Lockout timing time
Flame response
Main burner combustion standby time
Reset time
1 s or longer
Blower
Fuel oil valve
Two-level fuel oil valve
[Input]
Power supply
[7-segment display]
Limit, Interlock
[Output]
Ignition transformer
Burner operation switch
Controller
Flame signal
RESET switch
[LED]
FLAME LED (Green)
Alarm output
ALARM LED (Red)
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