11
• Ignition failure
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.
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.
If the pilot burner fails to ignite, the flame detector
cannot detect the pilot burner flame, and relay 2K
does not turn on.
5
Ignition switch OFF Since the ignition switch contacts are open, power • Ignition transformer OFF
to the ignition transformer, pilot valve, and
• Pilot valve closes
combustion lamp is cut off. Accordingly, ignition
• Combustion lamp turns
transformer operation stops, the pilot valve closes,
off
and the combustion lamp turns off.
Also, because relay 2K is not ON, the voltage
from terminal 4 by way of relays 1K and 2K is zero.
Therefore, no voltage is supplied to the main valve,
which does not open.
6
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.
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)
Elapsed time
(1)Power ON
(3)Burner start contacts ON
(4)Ignition switch ON
No flame detection
Start check (2s)
(5)Ignition switch
OFF (5-10s)
(6)Blower stop
(2)Blower operation
Note: It is possible that relay 2K may turn ON when the power is turned on.
