The ____________________ is the heart of an oil burner control system and supervises the operation of the oil burner.
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Q1: The basic control cycle of a gas
Q3: The _ fan switch is nothing more
Q4: In a(n) _ heating system, a call
Q5: _ systems use a spark igniter (direct
Q6: Steam is the most popular method of
Q7: How many contacts can a sequencer have?
Q8: What are the two main types of
Q9: The _ pilot burns only when there
Q10: Thermostats that are immersed in water are
Q11: What do forced-air electric furnaces use to
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