3-3
Chapter 3. OPERATION
Sequence charts
Operation sequences for this device are shown below.
Handling Precautions
•
Sequence charts include the following operations. When the blower on-off
circuit and prepurge circuit completes the prepurge, the prepurge completion
contacts connected to terminal 18 of the AUR450C are turned ON, the burner
start contacts are turned ON, and burner operation proceeds.
z Normal operation
When the start contact is turned ON, with the power supply and interlock also ON,
the operation progresses to RUN following the sequence shown below. When the
start contact is turned OFF, the sequence goes to standby.
-- P1 P2 P3 P4 P5 --
POWER
SHUTTER *
FLAME
ALARM
START
IG
PV
MV
Pre-purge
Power supply
Burner start contacts
Interlock
Flame signal
Ignition transformer
Interrupted pilot valve
Intermittent pilot valve
Main valve
Flame monitor output
Alarm output
Load output
Sequence
display
* When the voltage output to the shutter is ON (opening), the shutter LED goes o.
When the voltage output to the shutter is OFF (closing), the shutter LED lights up.
LED display
Standby
Start
check
Ignition trial Pilot Stabilization Main trial RUN Standby
K1
K2
K3
K4
K5
K6
K7
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