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DT Series - Installation manual (V4_2022)
13.3.
HONEYWELL NORMAL OPERATING SEQUENCE
The HONEYWELL flame safeguard relay has five (5) lights that show that the operating
sequence is normal and also to indicate burner malfunctions. When flashing the ALARM
light indicates a burner malfunction. To identify the anomaly, use the HONEYWELL S8700
keyboard display module.
1.
The (POWER) light flashes to indicate that the flame safeguard is energized and that
there is no heating demand.
2.
The (PILOT) light is ON when there is a heating demand and the pilot control valve
coil as well as the ignition transformer is energized.
3.
The (FLAME) light is ON when the flame safeguard relay detects a pilot flame signal
for 10 seconds.
4.
The (MAIN) light is ON when the flame safeguard relay detects a stable flame signal
for 10 seconds and all safety devices, low and high air pressure as well as high
temperature limit switches is closed between terminals 6 and 7.
5.
The (ALARM) lights flashes when a malfunction is detected. Refer to the
troubleshooting check list to establish diagnostic.
NOTE:
Pressing the reset button brings the flame safeguard relay back to its normal
operating mode and burner will restart.
Figure 14: Honeywell flame safeguard relay and keyboard module
