Furnace fan control
A fan control is described for use in system for controlling the termination operation of an air circulating fan delivering temperature conditioned air to a space in response to an operating time of a temperature conditioning apparatus comprising: circuit means having an input circuit and an output circuit, circuit connection means adapted to connect the input circuit to receive a signal when the temperature conditioning apparatus is operating, second circuit connecting means adapted to connect an output signal of the output circuit to maintain the air circulating fan operating, and power supply means adapted to be connected to a source of power, the power supply means having an output connected to the circuit means, the circuit means having variable delay means for delaying the termination of the air circulating fan operation in response to the total period of each continuous operation of the temperature conditioning apparatus, wherein the circuit means comprises first and second timing circuits, the first timing circuit being reset to zero when the signal indicative of temperature condition apparatus operation is received and commences to count when the signal is terminated, the first timing circuit maintains the output signal to keep the fan operating for a first period of time until the count is completed, and the second timing circuit is adapted to respond to fan operation to change the rate of count of the first timing circuit after the fan operates for a predetermined period.
- Assignee:
- Honeywell Inc., Minneapolis, MN
- Patent Number(s):
- US 4684060
- OSTI ID:
- 6086237
- Resource Relation:
- Patent File Date: Filed date 23 May 1986
- Country of Publication:
- United States
- Language:
- English
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