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• False flame detection during startup
Chapter 2. MOUNTING AND WIRING
No
Input status
FRS100 activity
Output activity
1
Power ON
Receives power across terminals 1 and 2.
(POWER LED lights up)
2
Blower operation
If the limit switch and interlock status is normal,
the blower starts. After completion of the prepurge,
the prepurge completion signal is transmitted to
allow execution of the next operation.
Flame detection
Relay 2K is turned on by a false flame signal.
(FLAME LED lights up)
3
Burner start
If the limit switch status is normal (limit switch
contacts ON
contacts closed),when the start contacts are closed
power is applied across terminals 7 and 2.
The start check is carried out, and relay 1K does
not turn on because a false flame is detected.
4
Ignition switch ON
Even though the ignition switch contacts are
closed, no voltage is applied to terminal 8, and so
the ignition transformer and the pilot valve do not
operate.
5
Ignition switch OFF No voltage is supplied from
terminal 4, and the load is not energized.
6
Blower stop
The power across terminals 7 and 2 is cut off, and
the FRS100 returns to standby status and waits
for the next start signal.
If the false flame signal is continuous, the FLAME
LED is also ON continuously.
Limit/Interlock contacts
Blower operation
Prepurge
Prepurge completion signal
Elapsed time
Ignition transformer
Pilot valve
Combustion lamp
POWER LED
FLAME LED
Start check LED
Main valve
Burner start contacts (term.7-2)
(1)Power ON
(3)Burner start contacts ON
Start check (2s)
(6)Blower stop
(2)Blower operation
Flame detection
(4)Ignition switch ON
(5)Ignition switch
OFF (5-10s)
Note: It is possible that relay 2K may turn ON when the power is turned on.
