Energy and peak-load conserving thermostat and method with controlled deadband
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United States of America Patent
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-
Jul 5, 1994
Issued Date -
N/A
app pub date -
Jul 27, 1993
filing date -
May 8, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A thermostat is disclosed for controlling a heating system, particularly a forced hot-air furnace, so as to improve fuel efficiency and decrease peak fuel load. The thermostat controls the length of fuel-on cycles, so that the heat exchanger of the furnace is not saturated. A wide deadband (approximately 3.degree. F.) for the thermostat further aids in lessening fuel usage. Forced air operation continues for a secondary-delivery period immediately after the thermostat turns the furnace off, thereby extracting additional heat from the heat exchanger and ductwork, but the length of the secondary-delivery period is limited so that the heat exchanger does not cool off beyond a predetermined amount.
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