15
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Explanation of operation
• Normal operation
Chapter 2. MOUNTING AND WIRING
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 LED lights
across terminals 7 and 2. After completion of the
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
Start contacts OFF
The power supplied across terminals 7 and 2 is
• (Start check LED turns
cut off, relay 1K turns off, and the power to
off)
terminals 4 and 8 is also cut off. The start check
• Start check completion
completion output and flame output turn off.
output OFF
Since the flame detector detects a flame failure,
• (FLAME LED turns off)
relay 2K turns off. The FRS100 returns to standby
• Flame output OFF
status and waits for the next start signal.
(2)Start contacts ON
(3)Flame detection
(4)Start contacts OFF
POWER LED
Flame output
Start check completion
FLAME LED
Start check LED
Start contact (term.7-2)
Elapsed time
(1)Power ON
Start check (2s)
Note: It is possible that relay 2K may turn ON when the power is turned on.
