The typical start up sequence for a direct spark ignition system is
A) Combustion blower, indoor blower, igniter, and gas valve all energized simultaneously
B) Indoor blower energized, igniter energized and gas valve energized, flames sensed, combustion blower energized after time delay
C) Combustion blower pre-purge, igniter and gas valve energized, flames sensed, indoor blower energized after time delay
D) Gas valve energized, igniter energized after delay, flames sensed, combustion blower and indoor blower energized
C
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