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Why does the fan on the central heat unit keep blowing after reaching the set temp?
Wiki User
∙ 12y ago
Most systems are equipped with some type of fan delay to allow the system to extract the heat remaining from the heat exchanger after the burner shuts off. Older systems had a bi-metal mechanical/ electric switch, while most newer ones have this built in to the blower control board. Some have a separate blower control that is electronic. Many are adjustable and should be set to turn the blower "off", from a time perspective when the temperature of the supply air drops to 80-100 deg. F. If an older mechanical type is set too low, the fan may run intermittantly during the summer when ambient temps may trip it "on"
lc
Wiki User
∙ 12y ago
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