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• Flame failure during combustion
Chapter 2. MOUNTING AND WIRING
POWER LED
Flame output
Start check completion
FLAME LED
Start check LED
Start contact (term.7-2)
Elapsed time
(1)Power ON
(2)Start contacts ON
Start check (2s)
(3)Flame
detection
(5)Start contacts OFF
(4)Flame failure
Flame response
No
Input status
FRS100 activity
Output activity
1
Power ON
Power is applied across terminals 1 and 2.
(POWER LED lights up)
2
Start contacts ON
When the start contacts are closed power is applied • (Start check operation
across terminals 7 and 2. After completion of the
LED lights up)
start check, relay 1K turns on. Since relay 1K turns • Start check completion
on, the start check completion output from terminal output ON
8 turns on.
3
Flame detection
The flame detector detects the flame of the pilot
• (FLAME LED lights up)
burner. Relay 2K turns on. Since relay 2K turns on, • Flame output ON
the flame output from terminal 4 turns on.
4
Flame failure occurs After the flame response period, relay 2K turns off, • (FLAME LED turns off)
the voltage supplied from terminal 4 is cut off, and
• Flame output OFF
the flame output turns off.
5
Start contacts OFF
The power supplied across terminals 7 and 2 is
• (Start check LED turns
cut off, relay 1K turns off, power to terminals 4 and
off)
8 is cut off, and the start check completion output
• Start check completion
turns off.
output OFF
The FRS100 returns to standby status and waits
for the next start signal.
Note: It is possible that relay 2K may turn ON when the power is turned on.
