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• Flame failure during combustion
Chapter 2. MOUNTING AND WIRING
No
Input status
FRS100 activity
Output activity
1
Power ON
If the limit switch and interlock status is normal,
(POWER LED lights up)
the blower starts. After completion of the prepurge,
the prepurge completion signal is transmitted to
allow execution of the next operation.
2
Blower operation
If the limit switch and interlock status is normal,
the blower starts. The prepurge completion signal
is transmitted to allow execution of the next
operation.
3
Burner start
If the limit switch and interlock status is normal
(Start check operation LED
contacts ON
(limit switch contacts closed), when the burner
lights up)
start contacts are closed, power is applied across
terminals 7 and 2. Relay 1K turns on after
completion of the start check.
4
Ignition switch ON
When the ignition switch is pushed (contacts closed), • Ignition transformer ON
power is applied from terminal 8 to the pilot valve
• Pilot valve opens
and ignition transformer. The ignition transformer
• Combustion lamp lights
turns on, the pilot valve opens, and the combustion up
lamp lights up.
The flame detector detects the pilot burner flame,
• (FLAME LED lights up)
and relay 2K turns on, allowing power to be
supplied through terminal 4.
5
Ignition switch OFF Since the ignition switch contacts are open, power • Ignition transformer OFF
to the ignition transformer is cut, and ignition
• Pilot valve continues
transformer operation stops.
open
Because power is supplied through relays 1K and • Main valve opens
2K, power through terminal 4 continues to maintain
the operation of the pilot valve. When the ignition
switch is turned off, its N.C. contacts close, supply-
ing power to the main valve, which opens.
6
Flame failure occurs Relay 2K turns off after the flame response period, • (FLAME LED turns off)
the voltage that was supplied from terminal 4 is cut • Pilot valve closes
off, the pilot valve and the main valve close, and
• Main valve closes
the combustion lamp turns off.
• Combustion lamp turns off
7
Blower stop
Power across terminals 7 and 2 is cut, and relay
(Start check operation
1K turns off.
LED turns off)
The FRS100 returns to standby status and waits
for the next start signal.
Elapsed time
Limit/Interlock contacts
Blower operation
Prepurge
Prepurge completion signal
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
(4)Ignition switch ON
Flame detection
Start check (2s)
(5)Ignition switch
OFF (5-10s)
(7)Blower stop
(2)Blower operation
Flame response
(6)Flame failure
Note: It is possible that relay 2K may turn ON when the power is turned on.
