1.
●
Internal Block Circuit
(5)
When the post-ignition is complete, the power
supply voltage is applied between the terminas
⑤
,
①
, and
⑦
.
When the power switch is turned off or the
temperature controller is turned off, all the circuits
return to the initial state to be ready for the next
ON signal.
(4)
Ignition transformer operation
starts.
Pilot valve ON
Combustion/Alarm indicator
LED illuminates.
When the flame detector (flame rod) detects
flame during the ignition trial (within 4 seconds),
the state becomes post-ignition.
(3)
When the prepurge is complete, the power
supply voltage is applied between the terminals
⑤
,
⑨
, and
⑦
.
The prepurge trial circuit starts.
(2)
Burner motor starts.
Air pressure switch ON
The power supply voltage is applied between the
terminals
②
,
⑩
,
③
and
⑦
.
(Voltage is applied to the terminal
③
when
the air pressure switch is turned on.)
Operation in Circuit
(1)
RCF15
Operation in Circuit
Burner motor stops.
Pilot valve OFF, Main valve
OFF
Combustion/Alarm indicator
LED is turned off.
The ignition transformer stops
operation.
Main valve ON
(6)
- 5 -
Equipment State
Operation
3
Keep the operation time for at least 1 minute between start/stop and stop/start of
the burner controller.
If the instruction is not observed, the controller will be reset when the power
switch or the temperature controller is turned off during lockout. Then the
lockout will become unavailable, which causes abnormal operation.
Fig. 5
Fig. 6
P
o
we
r
s
wi
tc
h
Limit switch
Temperature
controller
Burner motor
Alarm
Filter
circuit
Relay
K2
Relay
K1
LSI
(Electronic circuit)
SSH control
circuit
Start check
circuit
Prepurge trial
circuit
Main valve
circuit
Flame
circuit
Indicator
Combustion/Alar
LED lamp
CAUTION
Air
switch
Pilot valve
Ignition transformer
Main valve
