If “AUTO STOP”PB is pushed, in the state where the valve motion was worked, all
the FG shut off valves are closed, Fresh Air Damper will be opened and Supply
Damper will be closed. When furnace temp. cools down to 250 ℃ or less, Exhaust Fan, a Combustion Air Blower, and a Purge Fan is stopped automatically.
Valve Motion also stop in 5 minutes.