3). Burner control time chart
①
PRE-PURGE TIME : for 2 sec ± 1sec
→
In order to operate safely, fan emit the exhaust gas from burner before of starting ignition transformer.
②
PRE IGNITION TIME : 1 sec
→
To burn well, start the ignition before of supplying gas.
③
POST IGNITION TIME : 6 sec ± 1sec
→
After the initial burning, the igniter will operate for 1 or 2 seconds more in order to protect the burn from the initial
failure.
④
POST PURGE TIME : 10 sec ± 1sec
→
After stopping the burn, the fan will operate for some seconds to emit the exhausted gas from boiler.
Ⅰ
. Normal operation time chart
⑤ Safety cut-off time chart : 6sec ± 1sec
→
If the photo detector fails to sense the flame after steps of fan start - prepurge-preignition-fuel supply, it cut off
the fuel supply for safety combustion.
→
If fail to make flame by 3 times, it alarms automatically.
Time (sec)
Flames sensing
Time (sec)
RPM Sensing
Flames sensing
Proportion valve
Proportion
valve
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